MC44BS374CAEF - Freescale Semiconductor

Ordering Information

Device Temp Range Package

MC44BS374CAD,R2 0°C to +70°C SO16NB

MC44BS374CAEF,R2 0°C to +70°C SO16NB

Lead free

NOTE: For tape and reel, add R2 suffix.

SO16NB Package

This document contains information on a product under deve lopment. Freescale reserves the right to change or

MC44BS374CA

The MC44BS374CA audio and video modulator is for use in VCRs, set-top boxes, and

similar devices.

•Multi standard

•TV output level 82dBuV typical

•5V and 3.3V compatible I2C bus

Figure 1 shows the pin connections.

Figure 1. MC44BS374CA Pin Connections

GNDD

VCCD

XTAL

GND

TVOVCC

AUDIO

GND

PLLFLT

SDA

SCL

LOP

PREEM

TVOUT

VCCA

SPLFLT VIDEO

SO16 pin p acka ge

Technical data

MC44BS374CA

Rev. 1.2 04/2004

PLL Tuned UHF and

VHF Audio/Video High

Integra tion Modulator

Contents

Features . . . . . . . . . . . . . . . 2

Comparing the

MC44BS374CA to the

MC44BC374C . . . . . . . . 3

Pin Descriptions . . . . . . . . 3

MC44BS374CA Functional

Overview . . . . . . . . . . . . 4

Maximum Rati ngs . . . . . . . 5

Thermal Ratings . . . . . . . . . 5

Electrostatic Discharge . . . 5

Electrical Characteristics . 6

I2C Bit Mapping . . . . . . . . . 7

I2C Programming . . . . . . . . 8

Modulator High Frequency

Characteristics . . . . . . 10

Video Characteristics . . . 11

Audio Characteristics . . . 13

Characterization

Measurement Conditions

MC44BS374CA Modes of

Operation . . . . . . . . . . . 20

High Speed I2C Compatible

Bus . . . . . . . . . . . . . . . . 24

Pin Circuit Schematics . . 27

Application Diagram . . . . 28

MC44BS374CA Evaluation

Board Layout and

Schematic . . . . . . . . . . 29

Packaging Instructions . . 31

Marking Instructions . . . . 31

Case Outline 32

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MC44BS374CA Technical data

Features

1 Features

The MC44BS374CA is a Multi-Standard, PAL/NTSC Modulator.

The channel is set by an on-chip high -speed I2C compatible bus receiver. A Phase-Loc ked Loop ( PLL )

tunes the modulator over the full UHF range.

The modulator incorporates a sound subcarrier oscillator and uses a second PLL to derive 4.5, 5.5, 6.0,

and 6.5 MHz subcarrier frequencies. These frequencies are selectable by bus.

The picture-to-sound ratio may be adjusted using the bus. In addition, an on-chip video test pattern

generator can be switched ON with a 1 KHz audio test signal.

The MC44BS374CA also has the following features:

•Integrated on-chip programmable UHF oscillator

•No external varicaps diodes / inductor or tuned components

•Extremely low external components count

•Channel 21-69 UHF operation

•VHF range possible by internal dividers (30MHz-450MHz)

•Boosted TVout level (82 dBuV typical)

•High speed read and write I2C-bus compatible (800kHz)

•I2C-bus 5V and 3.3V compatible

•Fixed video modulatio n depth (82% typical)

•Peak White Clip disabled by bus

•Programmable picture/sound carrier ratio (12dB and 16dB)

•Integrated on-chip programmable sound subcarrier oscillator (4.5, 5.5, 6.0 and 6.5 MHz) - No

external varicaps

•On-chip video test pattern generator with sound te st signal (1kHz)

•Low-power programmable modulator standby mode

•Transient output inhibit during PLL Lock-up at power-ON

•Logical Output Port controlled by bus

•ESD protection, minimum 4 kV

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Comparing the MC44BS374CA to the MC44BC374C

MC44BS374CA Technical data

2 Comparing the MC44BS374CA to the MC44BC374C

Compared to the MC44BC374C devices, the MC44BS374CA has the following improvements:

•Higher output level (82 dBuV versus 74.5 dBuV)

•Higher Video signal to noise (+ 3 dB)

•I2C-bus 3.3V compatible

•Lower power consum ption in normal and standby modes (-2 mA)

•The device can be powered down without holding th e I2C lines down.

•TB1 bit is no more available (limited compatibility with MC44355 devices no more available)

•Switch between the two integrated VCO’s controlled directly by the frequency divider (@ 700

MHz)

3 Pin Descriptions

Table 1. Package Pin Descriptions

Pin number Pin Name Description

1SCL I2C clock

2SDA I2C data

3LOP Logical output port controlled by I2C bus

4XTAL Crystal

5GND Ground

6PREEMP Pre-emphasis capacitor

7AUDIO Audio input

8SPLFLT Sound PLL loop filter

9VIDEO Video input

10 VCCA Main analog supply voltage

11 GND Analog ground

12 TVOUT TV output signal

13 TVOVCC TV output stage supply voltage

14 PLLFLT RF PLL loop filter

15 VCCD Digital supply voltage

16 GNDD Digital ground

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MC44BS374CA Technical data

MC44BS374CA Functional Overview

4 MC44BS374CA Functional Overview

Figure 2 shows a simplified block diagram of the MC44BS374CA device.

The MC44BS374CA device has three main sections:

1. A high speed I2C-compatible bus section

2. A PLL section to synthesize the UHF / VHF output channel frequency (from an integrated

UHF oscillator, divided for VHF output)

3. A modulator section, which accepts audio and video inputs, then uses them to modulate the

UHF/VHF carrier

An on-chip video test pattern generator with an audio test signal is included.

The MC44BS374CA operates as a multi-standard modulator and can handle the following systems using

the same external circuit components: B / G, I, D / K, M / N.

High frequency BiCMOS technology allows integration of the UHF tank circuit and certain filtering

functions.

Figure 2. MC44BS374CA Simplified Block Diagram

15 16

TVOVCC

TVOUT

LOP VIDEO SPLLFLT

AUDIO

VCCA

GND

PREEM

XTALPLLFLTGNDDVCCD

SCL

SDA

BUS SECTION VCO and PLL SECTION

MODULATOR

SECTION

Clamp

Peak

White

31.25KHz

4MHz

XCO

Ref Divider

/128

Phase

Comp

PLL

Prog

Divider

Prescaler/8

VHF Dividers

Video

Modulator

LPF

RF Sound

Modulator

ALCLPF

Prog

Divider

Audio

Amplifier

Sound

Oscillator

and FM

Modulator

Sound

PFD

High Speed

C Bus

Receiver

UHF OSC

C BUS I

C BUS

Ω

5GND

Clip

31.25KHz

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Maximum Ratings

MC44BS374CA Technical data

5 Maximum Ratings

6 Thermal Ratings

7 Electrostatic Discharge

Electrostatic Discharge ( ESD ) tes ts are done on all pin

Sym Parameter Value Unit

Rthja Thermal resistance from Junction to Ambient 102 °C/W

Sym Parameter Min Unit

ESD MM (Machine Model) - MIL STD 883C method 3015-7 400 V

ESD HBM (Human Body Model) - MIL STD 883C method 3015-7 4000 V

Sym Parameter Value Unit

Vcc Supply voltage 6 V

Tamin Minimum operating ambient temperature 0 oC

Tamax Maximum operating ambient temperature +70 oC

Tstgmin Minimum storage temperature -65 oC

Tstgmax Maximum storage temp erature 150 oC

Tj Junction Temperature 150 oC

This device contains protection circuitry to guard

against damage due to high static voltage or electric

fields. However, precautions must be taken to avoid

applications of any volt age higher than maximum rated

voltages to this high impedance circuit. For proper

operation, input and ou tput voltages should be

constrained to the ranges indicated in the

Recommended Operating Conditions.

Note: Maximum ratings are those values beyond which damage to the device may occur. For functional operation,

values should be restricted to the Recommended Operating Condition.

Note: Meets Moisture Sensitivity Level 1, no dry pack required.

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MC44BS374CA Technical data

Electrical Characteristics

8 Electrical Characteristics

•A = 100% tested

•B = 100% Correlation tested

•C = Characterized on samples

•D = Design parameter

See Characterization conditions section for each C type parameter.

8.1 Operating Conditions

Unless otherwise stated: Vcc=5.0 V, Ambient Temperture=25o C, Video Input 1Vp-p, 10-step grayscale.

RF output into 75 Ohm load.

NOTE:

Specifications only valid for envelope demodulation.

Table 2. Operating Conditions

Parameter Min Typ Max Unit Notes Type

Operating supply voltage range 4.5 5.0 5.5 V B

Total supply current 42 50 58 mA All sections active A

Total standby mode supply current 3 5 7 mA OSC, SO, ATT = 1

Bus Section active A

Test pattern sync pulse width 34.7 6.5 µS B

Sound comparator charge pump current

During locking

When locked 7

0.7 10

112

1.5 µA

µAA

RF comparator charge pump current 60 100 150 µA A

Crystal oscillator stability-negative

resistance 1 - - K ΩD

Logic Output Port

Saturation voltage at I = 2 mA

Leakage current -

-160

-300

1mV

µAA

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I2C Bit Mapping

MC44BS374CA Technical data

9 I2C Bit Mapping

WRITE MODE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ACK

CA-CHIP ADDRESS 11001010ACK

C1-High Order Bits 1 0 SO LOP PS X3 X2 0ACK

C0-Low Order Bits PWC OSC ATT SFD1 SFD0 0X5 X4 ACK

FM-High Order Bits 0TPEN N11 N10 N9 N8 N7 N6 ACK

FL-Low Order Bits N5 N4 N3 N2 N1 N0 X1 X0 ACK

READ MODE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ACK

CHIP ADDRESS 11001011ACK

R-Status Byte -----Y2 Y1 OOR -

Bit Name Description

PWC Peak White Clip enable / disable

OSC UHF oscillator ON / OFF

ATT Modulator output attenuated-sound and video modulators ON / OFF

SFD0, 1 Sound subcarrier frequency control bits

SO Sound Oscillator ON / OFF

LOP Logic Output Port

PS Picture-to-sound carrier ratio

TPEN Test pattern enable-picture and sound

X5…X0 Test mode bits-All bits are 0 for normal operation (see Test Mode tables, page 6 & page 7)

N0…N11 UHF frequency programming bits, in steps of 250 kHz

OOR RF oscillator out-of-frequency range information

Y1, Y2 RF oscillator operating range information

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MC44BS374CA Technical data

I2C Programming

10 I2C Programming

WRITE MODE: Test Mode 1 and VHF Range

X2 X1 X0 State Description

0001.a Normal operation

0011.b RF frequency divided for low frequency testing or VHF range: RF / 2

0101.c RF / 4

0111.d RF / 8

1001.e RF / 16

1011.f DC drive applied to modulators: Non-inverted video at TVOUT

1101.g DC drive applied to modulators: Inverted video at TVOUT

1111.h Transient output inhibit disabled (ie speed up mode)

During this speed-up test mode, ATT=0 forces sound current source to 1µA, and

ATT=1 forces it to 10µA.

Sound

Video

SFD 1 SFD 0 Sound Subcarrier Freq (MHz)

00 4.5

01 5.5

10 6.0

11 6.5

PS Picture-to-Sound Ratio (dB)

012

116

SO Sound Oscillator

0 Sound oscillator ON (Normal mode)

1Sound oscillation disabled (oscillator and PLL

section bias turned OFF)

PWC Peak White Clip

0 Peak White Clip ON (System B / G)

1 Peak White Clip OFF (System L)

TPEN Test Pattern Signal

0 Test pattern signal OFF (normal operation)

1 Test pattern signal ON (picture and sound )

UHF

Standby Mode

Logic Output Port

OSC UHF Oscillator

0 Normal operation

1UHF oscillator disabled (oscillator and PLL

sections bias turned OFF)

ATT Modulator Output Attenuation

0 Normal operation

1Modulator output attenuation (sound and

video modulator s sections bias turned OFF.

OSC SO ATT Combination of 3-bits

1 1 1 Modulator standby mode

LOP Description

0 Pin 3 is low voltage

1 Pin 3 is high impedance

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I2C Programming

MC44BS374CA Technical data

WRITE MODE: Test Mode 2

NOTE:

Test modes 1 and 2 are intended for manufacturing test purposes only and

cannot be used for normal applications, except for VHF range (states 1.b

to 1.e).

READ MODE

X5 X4 X3 State Description

0002.a Normal operation

0012.b Test pattern generator DC verification (Test pattern DC test mode available)

0102.c Program divider test (UHF program divider on PLLFILT pin and sound program

divider on SPLLFIL pin)

0112.d Reference divider test (UHF reference divider on PLLFILT pin)

1002.e UHF phase comparison, upper source on PLLFILT pin

Sound phase comparison 10 µA upper source on SPLLFIL

( Only valid during transient output inhi bit. )

1012.f UHF phase comparison, lower source on PLLFILT pin

Sound phase comparison 10 µA lower source on SPLLFIL

( Only valid during transient output inhi bit. )

1102.g Sound phase comparison 1 µA upper source on SPLLFIL

( Not vali d during transient output inhibit. )

1112.h Sound phase comparison 1 µA lower source on SPLLF IL

( Not vali d during transient output inhibit. )

OOR Description

0Normal operation, VCO in range

1VCO out of range

Y1 Description

0VCO out of range, frequency too low, only valid if OOR=1

1VCO out of range, frequency too high, only valid if OOR=1

Y2 Description

0High VCO is active

1Low VCO is active

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MC44BS374CA Technical data

Modulator High Frequency Characteristics

11 Modulator High Frequency Characteristics

Unless otherwise stated: Vcc=5.0 V, Ambient Temperture=25o C, Video Input 1Vp-p, 10-step grayscale.

RF inputs / outputs into 75 Ohm load.

NOTE:

Specifications only valid for envelope demodulation.

Table 3. High Frequency Characteristics

Parameter Test Conditions Min Typ Max Unit Type

TVOUT output level Output signal from modulator section

See Figure 3. See Note 2 79 82 85 dBµV B

UHF oscillator frequency 460 -880 MHz A

VHF range From UHF oscillator internally divided 45 -460 MHz B

TVOUT output attenuation

During transient output inh ibit, or

when ATT bit is set to 1. See

Figure 3.

See Note 2

65 75 -dBc B

Sound subcarrier harmoni cs

(Fp + n ∗ Fs) Reference picture carrier. See Note 2 50 63 -dBc C

Second harmonic of chroma

subcarrier Using red EBU bar. See Note 2 45 70 -dBc C

Chroma / Sound intermodulation:

Fp + ( Fsnd - Fchr ) Using red EBU bar.See Note 2 65 82 -dBc C

Fo (picture carrier) harmonics

2nd harmonic: CH21

3rd harmonic: CH21

Other channels: See Figure 3.

See NOTE 1. See Note 2

-38

58 50

70 dBµV C

Out band (picture carrier)

spurious 1 / 2 ∗ Fo - 1 / 4 ∗ Fo - 3 / 2 ∗ Fo - 3 / 4 ∗ Fo

From 40 MHz to 1 GHz. See Note 2 - - 10 dBµV C

In band spurious (Fo @ 5 MHz) No video sound modulation.See Note

265 75 -dBc C

Note: 1: Picture carrier harmonics are highly dependant on PCB layout and decoupling capacitors.

Note: 2: See “Characterization Measurement Conditions” on page 14.

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Video Characteristics

MC44BS374CA Technical data

Figure 3. Typical High Frequency Performance

12 Video Characteristics

Unless otherwise stated: Vcc=5.0 V, Ambient Temperature=25o C, Video Input 1Vp-p, 10-step grayscale.

RF output into 75 Ohm load.

NOTE:

Specifications only valid for envelope demodulation.

Table 4. Video Performance Characteristics

Parameter Test Conditions Min Typ Max Unit Type

Video bandwidth Reference 0 dB at 100 kHz,

measured at 5 MHz. See Note 2 -1.5 -0.8 -dB C

Video input level 75 Ohm loa d - - 1.5Vcvbs D

Video input current -0.2 1µA A

Video input impedance 500 - - K ΩA

Peak White Clip Video Modulation depth for

video=1.4VCVBS 90.5 94 97.5 % B

TV Output Level

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

dBuV

TV Output Attenuation

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

dBc

3Fo Harmonics

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

dBuV

2Fo Harmonics

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

dBuV

Maximum specification

Minimum specification

Maximum specification

Minimum specification

Typical

Typical Typical

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MC44BS374CA Technical data

Video Characterist ic s

Figure 4. Typical Video Performance

Video S / N

No sound modulation,100% white video

Using CCIR Rec.567 weighting filter

See Figure 4. See Note 2 53 56 -dB C

Unweighted. See Note 2 48 53 - C

Differential Phase CCIR Test Line 330, worst case from

the first 4 steps out of 5. See Note 2 - 5 - 5 deg C

Differential Gain CCIR Test Line 330, worst case from

the first 4 steps out of 5. See Note 2 - 5 - 5 % C

Luma / Sync ratio Input ratio 7.0 : 3.06.8 /

3.2 7.0 /

3.0 7.2 /

2.8 - B

Video modulation depth See Figure 4. See Note 2 76 82 88 % B

Note: 2: See “Characte ri zation Measurement Conditions” on page 14.

Table 4. Video Performance Characteristics

Parameter Test Conditions Min Typ Max Unit Type

Video Signal to Noise

(with C CIR Weighting filter)

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

PAL Video Modulation Depth

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

Typical

Maximum specification

Minimum specification

Typical

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Audio Characteristics

MC44BS374CA Technical data

13 Audio Characteristics

Unless otherwise stated: Vcc=5.0 V, Ambient Temperture=25o C, Video Input 1Vp-p, 10-step grayscale.

RF inputs / outputs into 75 Ohm load.

NOTE:

Specifications only valid for envelope demodulation.

Figure 5. Typical Audio Performance

Table 5. Audio Performance Characteristics

Parameter Test Condi ti ons Min Typ Max Unit Type

Picture-to-Sound ratio PS bit set to 0

PS bit set to 1 9

13 12

16 15

19 dB B

Audio modulation depth

Using specific pre-emphasis circuit,

audio input level = 205 mVrms - audio freq uency = 1 kHz

FM modulation : Fs = 5.5, 6 or 6.5 MHz

100% modulation = +/-50 kHz FM

deviation 76 80 84 % B

FM modulation : NTSC Fs = 4.5 MHz

100% modulation = +/-25 kHz FM

deviation 76 80 84 % B

Audio input resistance 45 53 61 K ΩA

Audio Frequency

response

Reference 0 dB at 1 kHz,

using specified pre-emphasis circuit,

measure from 50 Hz to 15 kHz

Depends on loop filter components -2.0 -+2.0 dB C

Audio Distortion FM (THD

only) at 1 kHz, 100% modulation ( ± 50 kHz )

No video -0.2 0.8 % C

Audio S / N with Sync Buzz

Ref 1Khz, 50% modulatio n (+/-2 5Khz)

EBU color bars Video signal,

using CCIR 468.2 weighting filter 50 54 -dB C

Note: 2: See “Characterization Measurement Conditions” on page 14.

FM Audio Weighted Signal to Noise

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

Typical

Minimum specification

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MC44BS374CA Technical data

Characterization Measurement Conditions

14 Characterization Measurement Conditions

The following list shows the MC44BS374CA default configuration unless otherwise specified.

•Peak White Clip enabled

•UHF oscillator ON

•Sound and video modu lators ON

•Sound subcarrier frequency = 5.5 MHz

•Sound Oscillator ON

•Logic Output Port LOW

•Picture-to-sound carrier ratio = 12 dB

•Test pattern disabled

•All test mode bits are ‘0’

•Frequency from channel 21 to 69

RF Inputs / Output into 75ohm Load using a 75 to 50 ohm transformation. Video Input 1Vpp.

Audio pre-emphasis circuit enabled.

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Characterization Measurement Conditions

MC44BS374CA Technical data

Table 6. Measurement Conditions

Device and Signals Set-up Measurement Set-up

TVOUT output leve l

Video: 10 steps grey scale

No audio

Measured picture carrier in dBuV with the HP8596E Spectrum

Analyzer using a 75 to 50 ohm transformation, all cables losses and

transformation pads having been calibrated.

Measurement used as a reference for other tests: TVout_Ref

TVOUT output attenu at io n

ATT” bit = 1

No Video signal

No Audio signal

Measure in dBc p ict ure carrier at ATT=1 with referen c e to pi ct ure

carrier at ATT=0

Sound Subcarrier Harmonics

Video: 10 steps grey scale

No Audio signal Measure in dBc second and third sound harmonics levels in reference

to picture carrier (TVout_Ref).

Second Harmonics of Chroma subcarrier

No audio

Video: a 700m Vpp 100 kHz sinusoidal

signal is inserted on the black level of

active video area.

Measure in dBc, in refere nce to picture carrier (TVout_Ref), second

harmonic of chroma at channel frequency plus 2 times chroma

frequency, resulting in the following spectrum.

Picture carrier

Sound carrier

Sound

+5.5MHzFo +11MHz +16.5MHz

2nd harm

Sound

3rd harm

700mV pk-pk

Frequency

100kHz

Frequency

100Khz 700mVpkpk Picture carrier

Sound

Chroma 2nd

+8.86MHzFo +4.43MHz +5.5MHz

Harmonic

carrier

Chroma

carrier

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MC44BS374CA Technical data

Characterization Measurement Conditions

Chroma/Sound Intermodulation

No audio signal

Video: 700m Vpp 100 kHz sinusoidal

signal inserted on the black level of

active video area.This is generated using

a Rohde & Schwarz Video Generator

SAF and inserting the required frequency

from a RF Signal generator.

Measure in dBc, in reference to picture carrier (TVout_Ref),

intermodulation product at channel frequency plus the sound carrier

frequency (+5,5 MHz) minus the chroma frequency (-4,43 MHz),

resulting in the following spectrum.

Intermodulation product is at the channel frequency +1,07 MHz.

Picture Car r ier Harmonic s

No Video signal

No Audio signal Measure in dBc, in refere nce to picture carrier (TVout_Ref), second

and third harmonic of channel frequency, resultin g in the following

spectrum.

Out of Band Spurious

No Video signal

No Audio signal Measure in dBuV spurious levels at 0.25, 0.5, 0.75 and 1.5 times

channel frequency, resulting in the following spectrum

Measure from 40MHz to 1GHz.

In Band Spurious

No Video signal

No Audio signal

Measure in dBc, in refere nce to picture carrier (TVout_Ref), spurious

levels falling into video bandwidth starting from +/-100 KHz from the

picture carrier up to +/-5MHz.

Table 6. Measurement Conditions

Device and Signals Set-up Measurement Set-up

700mV pk-pk

Frequency

100kHz

Frequency

4.43 MHz 700mVpp

Picture carrier

Chroma/Sound

+1.07MHz

Intermod.

Sound

+4.43MHz +5.5MHz

carrier

Chroma

carrier

Picture carrier

3rd harmonic

3FoFo 2Fo

2nd harmonic

Picture carrier

Fo*3/2Fo/2Fo/4 Fo*3/4 Fo

Spurious

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Characterization Measurement Conditions

MC44BS374CA Technical data

Video Bandwidth

No audio

Video: 600mVpp sinusoidal signal

inserted on the black level of active video

area.

The Video signal is demodulated on the spectrum analyzer, and the

peak level of the 100KHz signal is measured as a reference. The

frequency is then swept from 100KHz to 5MHz, and then the difference

in dB from the 100KHz reference level is measured.

Weighted Video Signal to Noise

Video: 100% White video signal - 1Vpk-

pk.

No Audio signal

This is measured using a Rohde &

Schwarz AMFS UHF Demodulator in B/G

(using a CCIR Rec. 567 weighting

network, 100kHz to 5MHz band with

sound trap and envelope detection, and a

Rohde & Schwarz UAF Video Analyzer.

The Video Analyzer measures the ratio between th e amplitude of the

active area of the video signal (700mV) and the noise level in Vrms on

a video black level which is show below.

VideoS/N is calculated as 20 x log(700 /N) in dB.

Unweighted Video Signal to Noise

Same as above with CCIR filter disabled. Same as above.

Video Differential Phase

Video: 5 step Grey Scale- 1Vpk-pk.

No Audio signal

This is measured using a Rohde &

Schwarz AMFS UHF Demodulator in B/G

(using a CCIR Rec. 567 weighting

network, 100kHz to 5MHz band with

sound trap, and envelope detection, and

a Rohde & Schwarz UAF Video Analyzer.

On line CCIR 330, the video analyz er DP measure consists of

calculating the difference of the Chroma phase at the black level and

the different chroma subcarrier phase angles at each step of the

greyscale. The largest positive or negative difference indicates the

distortion.

The video analyzer method takes the worst step from the first 4 steps.

Table 6. Measurement Conditions

Device and Signals Set-up Measurement Set-up

noise level in Vrms

DIFF PHASE = * 100%

the phase at position 0

the largest positive or negative difference

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MC44BS374CA Technical data

Characterization Measurement Conditions

Video Differential Gain

Video: 5 step Grey Scale- 1Vpk-pk.

No Audio signal

This is measured using a Rohde &

Schwarz AMFS UHF Demodulator in B/G

(using a CCIR Rec. 567 weighting

network, 100kHz to 5MHz band with

sound trap and envelope detection, and a

Rohde & Schwarz UAF Video Analyzer.

On line CCIR 330 shown below, the video analyzer DG measure

consists of calculating the difference of the Chroma amplitude at the

black level and the different amplitudes at each step of the greyscale.

The largest positive or negative difference indica tes the distortion.

The video analyzer method takes the worst step from the first 4 steps.

Video Modulation Depth

No Audio signal

Video: 10 step grey scale This is measured using a HP8596E Spectrum Analyzer with a TV

Trigger option, allowing de modulation and triggering on any specified

TV Line. The analyzer is centred on the maximum peak of the Video

signal and reduced to zero Hertz span in Linear mode to demodulate

the Video carrier.

The Modulation Depth is calculated as (A-B)/A x 100 in%

Picture to Sound ratio

No Video signal

No Audio Signal

PS” bit set to 0 and 1

Measure in dBc sound carrier in reference to picture carrier

(TVout_Ref) for PS” bit=0 (PS=12dB typical) and for PS” bit=1

(PS=16dB),

Table 6. Measurement Conditions

Device and Signals Set-up Measurement Set-up

012345

5-step Greyscale with Chroma subcarrier superimposed

(not to scale), line CCIR 330.

DIFF GAIN = * 100%

the amplitude at position 0

the largest positive or negative difference

A ( 6-10mV)

B (0.6 - 3mV)

TV Line Demodulated by Spectrum Analyzer-BG standard

A(mV)

B(mV)

Picture carrier

Sound carrier

+5.5MhzFo

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Characterization Measurement Conditions

MC44BS374CA Technical data

Audio Modulation Depth - FM Modulation

Video Black Level

Audio signal: 1Khz, 205mVrms.

This is measured using a Rohde &

Schwarz AMFS Demodulator in B/G and

a HP8903A Audio Analyzer at 1kHz

The audio signal 205mV at 1kHz is supplied by the Audio Analyzer,

and the FM demodulated signal deviation is indicated on the

Demodulator in Khz peak.

This value is then converted in% of FM deviation, based on specified

standards.

Audio Frequen cy res po nse

Video Black Level

Audio signal: 50Hz to 15KHz, 100mVrms

This is measured using a Rohde &

Schwarz AMFS Demodulator in B/G and

a HP8903A.

The audio signal 1KHz 100mVrms is supplied by the Audio Analyzer,

demodulated by the Demodulator and the audio analyzer measures

the AC amplitude of this demodulated audio signal: this value is taken

as a reference (0dB).

The audio signal is then swept from 50Hz to 15KHz, and demodulated

AC amplitude is measured in dB relative to the 1KHz reference.

Audio pre-emphasis and de-emphasis circui ts are engaged, all audio

analyzer filters are switched OFF.

Audio Distortion FM

Audio: 1Khz, adjustable level

Video Black Level

This is measured using a Rohde &

Schwarz AMFS UHF Demodulator in B/G

and a HP8903A Audio Analyzer at 1kHz.

The output level of the Audio analyzer is

varied to obtain a deviation of 50kHz

indicated on the Demodu lator.

The input arms detector of the Audio Analyzer converts th e ac level of

the combined signal + noise + distortion to dc. It then removes the

fundamental signal (1kHz) after having measured the frequency. The

output rms detector converts the residual noise + distortion to dc. The

dc voltmeter measures both dc signals and calculates the ratio in% of

the two signals.

Audio Signal to No ise

Audio: 1Khz, adjustable level

Video: EBU Color Bars

This is measured using a Rohde &

Schwarz AMFS Demodulator in B/G and

a HP8903A Audio Analyzer at 1kHz. The

output level of the Audio analyzer is

varied to obtain a Modulation Deviation of

25kHz indicated on the AMFS

Demodulator.

The Audio Analyzer alternately turns ON and OFF it's internal audio

source to make a measure of the Audio signal plus noise and then

another measure of only th e noise.

The measurement is made using the internal CCIR468-2 Filter of the

Audio Analyzer together with the internal 30+/-2kHz (60dB/decade)

Lowpass filters.

The AMFS demodulator uses a quasi-parall el demodulation as is the

case in a normal TV set. In this mode the Nyquist filter is bypassed and

the video carrier is used without added delay to effectuate intercarrier

conversion. In this mode the phase noise information fully cancels out

and the true S/N can be measured.

Table 6. Measurement Conditions

Device and Signals Set-up Measurement Set-up

Dist Distorsion Noise+()Distorsion Noise Signal++()⁄=

ASN dB() 20 Signal Noise+()Noise()⁄log×=

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MC44BS374CA Technical data

MC44BS374CA Modes of Operation

15 MC44BS374CA Modes of Operation

15.1 Power ON Settings

At power-ON, the MC44BS374CA is configured as follows:

15.2 Power Supply

The three device Vccs (pins 10, 13 and 15) must be applied at the same time to ensure all internal blocks

are correctly biased. Do not bias any other pin before Vcc is applied to the MC44BS374CA.

When all Vccs are switched to 0V, SDA and SCL pins are high impedance.

15.3 Standby modes

During standby mode, the modulator is switched to low power consumption. That is, the sound oscillator,

UHF oscillator, and the video and sound modulator section’s bias are internally turned OFF.

The I2C bus section remains active.

The MC44BS374CA can be set to standby mode with a combination of 3 bits: OSC=1, SO=1 and ATT=1

15.4 Transient Output Inhibit

To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the

desired frequency, the Sound and Video modulators are turned OFF during a time out period for each of

the following two cases:

•Power-ON from zero ( i.e., all Vcc is switched from 0 V to 5 V ).

•UHF oscillator power-ON from OFF state ( i.e., OSC bit is switched from 1 to 0 )

There is a time-out of 263ms until the output is enabled. This lets the UHF PLL settle to its programmed

frequency. During the 263ms time-out, the sound PLL current source is set to 10 µA typical to speed up the

locking time. After the 263ms time-out, the current source is switched to 1 µA. Use care when selecting

loop filter components, to ensure the loop transient does not exceed this delay.

Table 7. Power ON Settings

WRITE MODE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ACK

C1-High Order Bits 10000000ACK

C0-Low Order Bits 00001000ACK

FM-High Order Bits 0 0 N11 N10 N9 N8 N7 N6 ACK

FL-Low Order Bits N5 N4 N3 N2 N1 N0 0 0 ACK

Note: N0 to N11 are set to have UHF oscillator on channel E36 ( 591.25 MHz ).

Note: Peak White Clip is ON.

Note: Sound frequency is 5.5 MHz.

Note: Logic Output Port is low voltage.

Note: Picture to sound ratio is 12 dB.

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MC44BS374CA Modes of Operation

MC44BS374CA Technical data

For test purposes, it is possible to disable the 263ms delay using Test Mode 1-State 1.h (this is called speed

up mode).

15.5 UHF Oscillator-VHF range

The UHF oscillator is fully integrated and does not require any external components.

For low frequency testing or VHF range operation ( test mode 1, states 1.b to 1.e ), the UHF oscillator can

be internally divided by: 2, 4, 8, or 16.

15.6 UHF PLL Section

The reference divider is a fixed divide-by-128, resulting in a reference frequency of 31.25 KHz with a

4.0 MHz crystal.

The prescaler is a fixed divide-by-8 and is permanently engaged.

The programmable divider division-ratio is controlled by the state of control bits N0 to N11.

The divider-ratio N for a desired frequency F (in MHz) is given by:

with:

NOTE:

Programming a division-ratio N=0 is not allowed.

15.7 Logic Output Port (LOP)

The LOP pin controls any logic function. The primary applications for the LOP are to control an external

attenuator or an external switch, between the antenna input and TV output. A typical attenuato r application

with PIN diode is shown in Figure 6. T h e L OP pi n s w i t c h es t h e P I N attenua tor depending on the signal

strength of the Antenna Input. This reduces the risks of int ermodulation in certain areas. The LOP can also

be used as an OFF position bypass switch or for other logic functions in the application.

Figure 6. Typical Attenuator Application with Pin Diode

--- 128

---------

×=

N2048 N11×1024 N10×……4N2×2N1×N0+ ++++=

LOP pin

Vcc

TV Out

Antenna

Input

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MC44BS374CA Technical data

MC44BS374CA Modes of Operation

15.8 Video Section - Peak White Clip

The MC44BS374CA requires the following for proper video functionality:

•A composite video input with negative going sync pulses

•A nominal level of 1 Vpp

This signal is AC-coupled to the video input where the sync tip level is clamped.

The video signal is then passed to a Peak White Clip (PWC) circuit. The PWC circuit function soft-clips

the top of the video waveform, if the sync tip amplitude to peak white clip goes too high. This avoids

carrier over-modulation by the video. Clipping can be disabled by software.

15.9 Test Pattern Generator

The I2C generates a simple test pattern, which can be switched under bus control to permit a TV receiver to

easily tune to the modulator output. The pattern consists of two white vertical bars on a black background

and a 976 Hz audio test signal.

Figure 7. Test Pattern Generator

10 20 30 40 50 60

064

TE1

24 28 44

T IME IN µS.

7/10

3/10

TE2

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MC44BS374CA Modes of Operation

MC44BS374CA Technical data

15.10 Sound Section

The oscillator is fully integrated and does not require any external components. An internal low-pass filter

and matched structure provide very low harmonics levels.

The sound modulator system consists of an FM modulator incorporating the sound subcarrier oscillator.

The audio input signal is AC-coupled into the amplifier, which then drives the modulator. The audio pre-

emphasis circuit is a high-pass filter with an external capacitor and an internal resistor ( 106 K Ohms

typical ).

The recommen de d ca pa c itor value for BG standard (with a time constant of 50 µS) is 470 pF.

The recommen de d ca pa c itor value for M/N standard (with a time constant of 75 µS) is 750 pF.

To increase the audio bandwidth at low frequencies it is possible to change the sound PLL loop filter. The

recommended va lues are 220 nF and 22 nF. To increase the bandwidth at low frequencies (lower than 50

Hz), it is possible to use larger loop filter capacitor va lues. This will give a lower cut off frequency. In this

case it is necessary to calcultate the new values of the loop filter according to the required Q factor and

loop bandwidth. This is described in the following figure.

Figure 8. Sound PLL Loop Filter Calculation

Sound PLL loop filter calculation

Loop filter equation : 1*

*CN KoscKpd

, oCR

*1* 1

=, with :

 ωo = 3dB cut off frequency

 Kpd = 1uA : Phase detector current

 Kosc = 5MHz/V : sound oscillator slope (in fact Kosc=40MHz/prescaler divider

=8) This provides 5 MHz/V

 N = sound divider ratio

 Q = quality factor

C2, added to minimize glitches, is usually set to one tenth the size of C1.

Example :

Fref=31.25KHz  N=5.5MHz / 31.25KHz = 176

Assuming C1= 220 nF, then ωo = 360 rad, and fo= 57Hz

Q depends on the desired frequency response ; Choosing Q = 0.7 as a starting point,

then R= 18 kΩ. The resistance acts directly on the factor quality and can be ad

usted to

create peaking on the low frequency range. It is recommended to adjust the value of R

experimentally depending on the application and requirements. In the proposed

application schematic a value of 15 18 kΩ has been chosen.

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MC44BS374CA Technical data

High Speed I2C Compatible Bus

16 High Speed I2C Compatible Bus

16.1 Specification Conditions

Unless otherwise specified, Vcc = 5.0 V, TA = 25 oC.

16.2 Timing Definitions

Figure 9. SSDA/SSCL Timing

Electrical Characteristics Symbol Min Typ Max Unit Type

SDA / SCL output current at 0 V -5 -2 -µA A

SDA / SCL low input level VIL - - 1.5 V B

SDA / SCL high input level VIH 2.1 - - V B

SDA/SCL input current for input level from 0.4V to 0.3Vcc - 5 - 5 µA C

SDA/SCL input level 0 - Vcc+0,3 V D

SDA/SCL capacitance - - 10 pF C

ACK low output level (3 mA sinking current) - - 0.3 V C

ACK low output level (9 mA sinking current) - - 0.8 V C

Timing Characteristics Symbol Min Typ Max Unit Type

Bus clock frequency 0 - 800 kHz C

Bus free time between stop and start Tbuf 200 - - ns C

Setup time for start condition Tsu;sta 500 - - ns C

Hold time for start condition Thd;sta 500 - - ns C

Data setup time Tsu;dat 0 - - ns C

Data hold time Thd;dat 0 - - ns C

Setup time for stop condition Tsu;sto 500 - - ns C

Hold time for stop condition Thd;sto 500 - - ns C

Acknowledge propagation delay Tack;low - - 300 ns C

SDA fall time at 3ma sink I and 130pF load - - 50 ns C

SDA fall time at 3ma sink I and 400pF load - - 80 ns C

SDA rise time

SCL fall/rise time -

-300

300 ns

ns C

Pulse width of spikes suppressed by the input filter - - 50 ns C

Tbuf

SSDA

...

ACK

Thd;datTsu;datTsu;sto Thd;sta Tack:low

StartStop

SSCL SCL

SDA

Tsu;sta

Chip Address

SCL

SDA

Thd;sto

Start Stop

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High Speed I2C Compatible Bus

MC44BS374CA Technical data

16.3 Level Definitions

SDA/SCL high and low levels are designed to be compatible with 0-5V and 0-3.3V SDA / SCL signals.

Figure 10. SDA/SCL Levels

16.4 High Speed I2C Compatible Bus Format

Figure 11. I2C Bus Timing

16.5 I2C Write Mode Format and Bus Receiver

The bus receive r o pe rates the I2C compatible data format. The chip address ( I2C bus ) is as follows.

In write mode, each ninth data bit ( bits 9, 18, 27, 36, and 45 ) is an acknowledge bit (ACK) during which

the MCU sends a logic 1 and the Modulator circuit answers on the data line by pulling it low. Besides the

chip address, the circuit nee ds two or four data bytes for operation. The following sequences of data bytes

are the permitted incoming information:

Table 8. Chip Address (I2C Bus)

1 1 0 0 1 0 1 0 (ACK) = $CA ( hex ) in write mode

Table 9. Permitted Data Bytes (Inco m in g Info rma tio n )

Example 1 STA CA C1 C0 STO

Example 2 STA CA FM FL STO

Example 3 STA CA C1 C0 FM FL STO

Example 4 STA CA FM FL C1 C0 STO

Note:

SDA ... 0V

Vcc

Vih

Vil dead band

1 2 3 4 5 6 7 8 9 10 14

11 12 13 454415 19

16 17 18

STA Chip Address ($CA) ACK ACK

First Data Byte (C1 or FM) Data ACKStop

SCL

SDA

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MC44BS374CA Technical data

High Speed I2C Compatible Bus

After the chip address, two or four data bytes may be received.

•If three data bytes are received, the third one is ignored.

•If five or more data bytes are received, the fifth and following ones are ignored, and the last ACK

pulse is sent at the end of the fourth data byte.

The first and third data bytes contain a function bit, which lets the IC distinguish between frequency

information and control information. If the function bit is a logic 1, the two following bytes contain control

information. The first data byte after the chip address, may be byte CO or byte FM. The two bytes of

frequency information are preceded by a logic 0.

16.6 I2C Read Mode Format

The chip addres s ( I2C ) is:

The incoming information consists of the read mode chip address byte. The device then answers with an

ACK followed by one byte containing three bits of status information. No acknowledge is answered by the

modulator after this byte.

STA = Start condition CA = Chip Address

FM = Frequency information, high order bits FL = Frequency information, low order bits

C1 = Control information, high order bits CO = Control information, low order bits

STO = Stop condition

Table 10. Chip Address (I2C Read Mode)

1 1 0 0 1 0 1 1 (ACK) = $CB ( hex ) in read mode

Table 9. Permitted Data Bytes (Incoming Information)

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Pin Circuit Schematics

MC44BS374CA Technical data

17 Pin Circuit Schematics

Figure 12. Pin Circuit Schematics

VCCD

50 1/2 VCCD

VCCD

25K 1/2 VCCD

SDA SCL

XTAL

SPLLFLT

ACK

11.8k audio

10k

PREM

50k

AUDIO IN

VIDEO

500

TV OUT

VCC

1.5K

VCC

25K

VCC

TVOVCC

VCC

10K

LOP

VCC

PLLFLT

VCC

100

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MC44BS374CA Technical data

Application Diagram

18 Application Diagram

Figure 13. Proposed SO16 Package (Mono Application Schematic)

Note: 1. Cx value depends on crystal characteristics. Cx = 27 pF on Motorola application board.

Note: 2. RF PLL Loop Filter components at pin 14 must be as close as possible to Vccd at pin 15.

Note: 3. Supply voltage decoupling capacitors must be as close as possible to ground.

TVOUTO

2.2k

22nF

1nF

10nF

47nF

Vcc

This document contains information on a new product under development.

Motorola reserves the right to change or discontinue this product without notice.

SCLSDA

4MHz

Vcc

Pre-em

GNDD

VCCD

PLLFLT

GND

VIDEO

TVOVCC

SPLLFLT

SDA

SCL

LOP

TVOUT

VCCA

Audio

Video

LOP

10nF

100nF

220nF

100nF

22nF

470pF

XTAL

GND

PREEM

AUDIO 10nF

Note 1

15K

Note 2

Note 3

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MC44BS374CA Evaluation Board Layout and Schematic

MC44BS374CA Technical data

19 MC44BS374CA Evaluation Board Layout and Schematic

19.1 Evaluation Board Layout

Figure 14. Evaluation Board PCB Layout

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MC44BS374CA Technical data

MC44BS374CA Evaluation Board Layout and Schematic

19.2 Evaluation Board Schematic

Figure 15. Evaluation Board Schematic

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Packaging Instructions

MC44BS374CA Technical data

20 Packaging Instructions

Tape and reel packaging per 12MRH00360A issue Y with the following conditions applicable for Dual In-

Line SOP (SOIC) package. For lead free package meets Moisture Sensitivity Level 3 (dry pack required).

Figure 16. Dual In-line SOP (SOIC)

Component Orientation: Arrange parts with the pin 1 side closest to the tape's round sprocket holes on the

tape's trailing edge.

21 Marking Instructions

Bar marked part way acros s Pin 1 end of package.

Bar width 10 to 20 mils, length to be at least four

times Bar width. Bar placement may extend across

chamfer and dimple areas.

Pin 1 Dot or Dimple

•1st line:

MCBS374CA (Part number coded on 10 digits)

•2nd line:

Assembly site code AW (2 digits) followed by the

wafer lot code L (1 digit),

year Y (1 digit) and

work week WW (2 digits)

MCBS374CA

AWLYWW

Bar marked part way across Pin 1 end of package.

Bar width 10 to 20 mils, length to be at least four

times Bar width. Bar placement may extend across

chamfer and dimple areas.

Pin 1 Dot or Dimple

•1st line:

MBS374CAEF (Part number coded on 10 digits)

•2nd line:

Assembly site code AW (2 digits) followed by the

wafer lot code L (1 digit),

year Y (1 digit) and

work week WW (2 digits)

MBS374CAEF

AWLYWW

SO16NB Lead free package

SO16NB package

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MC44BS374CA Technical data

Case Outline

22 Case Outline

Figure 17. SO16NB Package

Dim Millimeters Inches

Min Max Min Max

A 1.35 1.75 0.054 0.068

A1 0.1 0.25 0.004 0.009

D 9.8 10 0.385 0.393

E 5.8 6.2 0.229 0.244

E1 3.8 4 0.150 0.157

b 0.35 0.49 0.014 0.019

c 0.19 0.25 0.008 0.009

e 1.27 BSC 0.050 BSC

L 0.4 1.25 0.016 0.049

h 0.25 0.5 0.010 0.019

Q0o7o0o7o

Note: 1. Dimensions and Tolerances per ASME Y14.5M,

1994.

Note: 2. Controlling dimension: Millimeters.

Note: 3. Dimension D and E1 do not include mold

protrusion.

Note: 4. Maximum mold protrusion 0.15 ( 0.006 ) per side.

Note: 5. Dimension b does not include Dambar protrusion.

Allowable Dambar protrusion shall be 0.127 ( 0.005 )

total in excess of the b dimension at maximum material

condition.

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MC44BS374CA

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MC44BS374CA Technical data

Case Outline

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