SI4742-C10-GM - Silicon Labs

ADC

Si474x

DSP

DAC

AMI

VIO

SCLK

SDIO

CNTRL

SEN

RST

ROUT

LOUT

LDO

VDD

GND

3.0–3.6 V

RDS

GND

FMI

LNA

LNA DIGITAL

AUDIO

DOUT

DFS

DCLK

AGC

AFC

RCLK

WEAK

SIGNAL

CONDITION

QUALITY

DETECTOR

AGC GPO1-3

Si4740/41/42/43/44/45

Automotive AM/FM Radio Receiver

Description

The Si474x receiver family applies 100% RF CMOS

technology to bring digital low-IF radio technology to the

automotive receiver market. The Si474x receiver family

builds on Silicon Laboratories’ hi ghly successful broadcast

audio radio products, offering design simplicity, unmatched

integration, programmability, and automotive quality and

reliability.

The Si474x receiver family supports world-wide FM bands

from 64–108 MHz and AM band s from 520–17 10 kHz. The

Si474x supports AM/FM, weather band, shortwave, and

longwave radio bands. All odd-numbered part numbers in

the family support international RDS/RBDS protocols.

The Si474x family levera ges Silico n Laboratories’ patente d

digital architecture, delivering superior RF performance

and interference rejection. The proven digital radio

technology provides excellent sensitivity in weak signal

environments, and superb selectivity and inter-modulation

immunity in strong signal environments.

The solution offers programmable AM/FM channel spacing

and filters, auto-calibrated digital tuning, and proven

AM/FM seek functionality based on multiple signal quality

and band parameters. The family offers highly flexible and

advanced audio features such as noise blanking,

programmable soft mute, and multi-path detection and

mitigation.

The Si474x receiver system has a minimal bil l of materials

requiring a small a mount of board space. The high level of

integration provides a complete, tested broadcast audio

receiver that is ideal for primary automotive radio receivers.

Features

-Worldwide FM band support (64–108 MHz)

-Worldwide AM band support (520–1710 kHz)

-Shortwave, longwave support (Si4742/43/44/45 only)

-Weather band support (Si4742/43 only)

-Received signal quality indicators (RSSI, SNR, adjacent

channel, wideband AM)

-Multip ath detection/mitiga ti o n

-AM and FM noise blankers (Si4742/43/44/45 only)

-AM and FM programmable seek tuning

-AM and FM programmable soft mute control

-AM and FM adjustable channel bandwidth filters

-FM stereo-mono blending

-FM Hi-Cut control (Si4742/43/44/45 only)

-Digital FM stereo decoder

-RDS/RBDS processor (Si4741/43/45 only)

-Automatic frequency control (AFC)

-Automatic gain control (AGC)

-Image rejection mixer

-Frequency synthesizer with integrated VCO

-Low-IF direct conversion with no ceramic filters

-Analog or digital (I2S) outputs

-3.0 to 3.6 V supply voltage

-Programmable reference clock

-AECQ-100 certified

•–40 to 85 ºC operation

- 24-pin 4 x 4 mm QFN package

•Pb-free/RoHS compliant

Applications

-OEM automotive radio systems

-After-market automotive radio systems

-Automotive radio modules

Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.

Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.

Si4740/41/42/43/44/45

Automotive AM/FM Radio Receiver

Selected Electrical Specifications1

(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –40 to 85 °C)

Parameter Test Condition Min Typ Max Unit

Input Frequency 64 —108 MHz

Sensitivity (S+N)/N = 26 dB — 2 — µV EMF

RDS Sensitivity f = 2 kHz, RDS BLER < 5% — 8 — µV EMF

Audio S/N (Mono)2,3 fMOD = 1 kHz, f = 22.5 kHz,

VEMF = 60 dBµVEMF —63 —dB

Audio THD (Mono)2,3 fMOD = 1 kHz, f = 75 kHz,

VEMF = 60 dBµVEMF —0.1 — %

Input IP3 f1 = 4000 kHz; f2 = 8000 kHz —105 —dBµV EMF

Audio Output Voltage —80 —mVrms

Adjacent Channel Selectivity ±200 kHz —50 —dB

Alternate Channel Selectivity ±400 kHz —70 —dB

AM Suppression4m = 0.3; f = 22.5 kHz; fRF = 76 to 108 MHz;

Measured at VEMF = 60 dBµVEMF —55 —dB

Audio Stereo Separation4fRF = 76 to 108 MHz; Measured at VEMF =

60 dBµVEMF; f = 75 kHz —45 —dB

Supply Voltage53 — 3.6 V

Supply Current5—26 —mA

Input Frequency 520 — 1710 kHz

Sensitivity (S+N)/N = 26 dB — 28 — µV EMF

Audio S/N4,6 30% modulation, fMOD =1 kHz,

RF level = 74 dBµV EMF; f = 22.5 kHz — 53 — dB

Audio THD4,6 30% modulation, fMOD =1 kHz,

RF level = 74 dBµV EMF; f = 22.5 kHz — 0.3 — %

Input IP37f1 = 40 kHz; f2 = 80 kHz — 112 — dBµV

Audio Output Voltage454 60 66 mVrms

Adjacent Channel Selectivity ±10 kHz — 40 — dB

Alternate Channel Selectivity ±20 kHz — 60 — dB

Notes:

1. Specifications refer to Si474x application circuit input.

2. BAF = 300 Hz to 15 kHz.

3. fRF = 76 to 108 MHz.

4. FMOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherw ise.

5. Applies to both FM and AM modes.

6. AGC is disabled.

7. Specification refers to Si474x input.

Pin Assignments

GND

PAD

21222324

78910

RCLK

DFS

DOUT

LOUT

ROUT

AMI

FMI

SDIO

SCLK

GND

RFGND

AGC1

GPO1/AGC2

VDD

GPO2/INT

GND

VIO

SEN

RST

GPO3/DCLK

Symbol Millimeters

Min Nom Max

A 0.80 0.85 0.90

A1 0.00 0.02 0.05

b 0.18 0.25 0.30

D 4.00 BSC

D2 2.00 2.10 2.20

e 0.50 BSC

E 4.00 BSC

E2 2.00 2.10 2.20

L 0.30 0.40 0.50

aaa — — 0.10

bbb — — 0.10

ccc — — 0.08

ddd — — 0.10

eee — — 0.10

4x4x0.85mm 24-pin QFN Package Information