ADS-917GM - Murata Power Solutions

Figure 1. ADS-917 Functional Block Diagram

REF

REGISTERREGISTER

18 BIT 1 (MSB)

17 BIT 2

12 BIT 3

11 BIT 4

10 BIT 5

9 BIT 6

8 BIT 7

7 BIT 8

6 BIT 9

5 BIT 10

4 BIT 11

3 BIT 12

2 BIT 13

1 BIT 14 (LSB)

TIMING AND

CONTROL LOGIC

+10V REF. OUT 21

START CONVERT 16

EOC 15

DIGITAL CORRECTION LOGIC

DAC

FLASH

ADC

BUFFER

–

S/H

ANALOG INPUT 20

+5V SUPPLY

+12V/+15V SUPPLY

19, 23

ANALOG GROUND

DIGITAL GROUND

–12V/–15V SUPPLY

BLOCK DIAGRAM

The ADS-917 is a high-performance, 14-bit,

1MHz sampling A/D converter. This device samples

input signals up to Nyquist frequencies with no

missing codes. The ADS-917 features outstanding

dynamic performance including a THD of –80dB.

Housed in a small 24-pin DDIP or SMT (gull-

wing) package, the functionally complete ADS-917

contains a fast-settling sample-hold ampliﬁ er, a

subranging (two-pass) A/D converter, a precise

voltage reference, timing/control logic, and error-

correction circuitry. Digital input and output levels

are TTL.

Requiring ±15V (or ±12V) and +5V supplies,

the ADS-917 dissipates 1.9W (1.6W for ±12V)

maximum. The unit is offered with a unipolar

input (0 to +10V). Models are available for use in

either commercial (0 to +70°C) or HI-REL (–55 to

+125°C) operating temperature ranges. Applica-

tions include radar, sonar, spectrum analysis, and

graphic/medical imaging.

PRODUCT OVERVIEW

FEATURES

■ 14-bit resolution

■ 1MHz sampling rate

■ Functionally complete; No missing codes

■ Edge-triggered; No pipeline delays

■ Small 24-pin DDIP or SMT package

■ Low power, 1.9 Watts maximum

■ Operates from ±15V or ±12V supplies &

+5V supply

■ Unipolar 0 to +10V input range

INPUT/OUTPUT CONNECTIONS

PIN FUNCTION PIN FUNCTION

1 BIT 14 (LSB) 24 –12V/–15V SUPPLY

2 BIT 13 23 ANALOG GROUND

3 BIT 12 22 +12V/+15V SUPPLY

4 BIT 11 21 +10V REFERENCE OUT

5 BIT 10 20 ANALOG INPUT

6 BIT 9 19 ANALOG GROUND

7 BIT 8 18 BIT 1 (MSB)

8 BIT 7 17 BIT 2

9 BIT 6 16 START CONVERT

10 BIT 5 15 EOC

11 BIT 4 14 DIGITAL GROUND

12 BIT 3 13 +5V SUPPLY

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 1 of 8

PHYSICAL/ENVIRONMENTAL

PARAMETERS MIN. TYP. MAX. UNITS

Operating Temp. Range, Case

ADS-917MC, GC 0 — +70 °C

ADS-917MM, GM –55 — +125 °C

Thermal Impedance

θjc — 6 — °C/Watt

θca — 24 — °C/Watt

Storage Temperature Range –65 — +150 °C

Package Type 24-pin, metal-sealed, ceramic DDIP or SMT

Weight 0.42 ounces (12 grams)

ABSOLUTE MAXIMUM RATINGS

PARAMETERS LIMITS UNITS

+12V/+15V Supply (Pin 22) 0 to +16 Volts

–12V/–15V Supply (Pin 24) 0 to –16 Volts

+5V Supply (Pin 13) 0 to +6 Volts

Digital Input (Pin 16) –0.3 to +VDD +0.3 Volts

Analog Input (Pin 20) –4 to +17 Volts

Lead Temperature (10 seconds) +300 °C

+25°C 0 TO +70°C –55 TO +125°C

ANALOG INPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS

Input Voltage Range ➁ — 0 to +10 — — 0 to +10 — — 0 to +10 — Volts

Input Resistance — 1 — — 1 — — 1 — k

Input Capacitance — 7 15 — 7 15 — 7 15 pF

DIGITAL INPUT

Logic Levels

Logic "1" +2.0 — — +2.0 — — +2.0 — — Volts

Logic "0" — — +0.8 — — +0.8 — — +0.8 Volts

Logic Loading "1" — — +20 — — +20 — — +20 µA

Logic Loading "0" — — –20 — — –20 — — –20 µA

Start Convert Positive Pulse Width ➂ 20 200 — 20 200 — 20 200 — ns

STATIC PERFORMANCE

Resolution — 14 — — 14 — — 14 — Bits

Integral Nonlinearity (fin = 10kHz) — ±0.5 — — ±0.75 — — ±1.5 — LSB

Differential Nonlinearity (fin = 10kHz) — ±0.5 +0.95 — ±0.5 ±0.95 -0.95 ±0.75 +1.25 LSB

Full Scale Absolute Accuracy — ±0.05 ±0.1 — ±0.1 ±0.2 — ±0.15 ±0.4 %FSR

Unipolar Offset Error (Tech Note 2) — ±0.1 ±0.2 — ±0.1 ±0.2 — ±0.15 ±0.4 %FSR

Gain Error (Tech Note 2) — ±0.1 ±0.25 — ±0.1 ±.025 — ±0.25 ±0.4 %

No Missing Codes (fin = 10kHz) 14 — — 14 — — 14 — — Bits

DYNAMIC PERFORMANCE

Peak Harmonics (–0.5dB)

dc to 100kHz — –87 –82 — –87 –82 — –85 –80 dB

100kHz to 500kHz — –81 –76 — –81 –76 — –79 –74 dB

Total Harmonic Distortion (–0.5dB)

dc to 100kHz — –85 –82 — –85 –82 — –84 –80 dB

100kHz to 500kHz — –80 –76 — –80 –76 — –79 –74 dB

Signal-to-Noise Ratio

(w/o distortion, –0.5dB)

dc to 100kHz 75 79 — 75 79 — 73 77 — dB

100kHz to 500kHz 73 78 — 73 78 — 72 76 — dB

Signal-to-Noise Ratio ➃

(& distortion, –0.5dB)

dc to 100kHz 74 77 — 74 77 — 72 76 — dB

100kHz to 500kHz 72 76 — 72 76 — 71 75 — dB

Two-tone Intermodulation

Distortion (fin = 100kHz,

500kHz, fs = 1MHz –0.5dB) — –87 — — –86 — — –85 — dB

Noise — 300 — — 400 — — 600 — µVrms

Input Bandwidth (–3dB)

Small Signal (–20dB input) — 7 — — 7 — — 7 — MHz

Large Signal (–0.5dB input) — 5 — — 5 — — 5 — MHz

Feedthrough Rejection (fin = 500kHz) — 84 — — 84 — — 84 — dB

Slew Rate — ±60 — — ±60 — — ±60 — V/µs

Aperture Delay Time — ±20 — — ±20 — — ±20 — ns

Aperture Uncertainty — 5 — — 5 — — 5 — ps rms

S/H Acquisition Time

(to ±0.003%FSR, 10V step) 530 570 610 530 570 610 530 570 610 ns

Overvoltage Recovery Time ➄ — 400 1000 — 400 1000 — 400 1000 ns

A/D Conversion Rate 1 — — 1 — — 1 — — MHz

FUNCTIONAL SPECIFICATIONS

(TA = +25°C, ±VCC = ±15V (or ±12V), +VDD = +5V, 1MHz sampling rate, and a minimum 1 minute warmup ➀ unless otherwise speciﬁ ed.)

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 2 of 8

TECHNICAL NOTES

+25°C 0 to +70°C –55 to +125°C

ANALOG OUTPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS

Internal Reference

Voltage +9.95 +10.0 +10.05 +9.95 +10.0 +10.05 +9.95 +10.0 +10.05 Volts

Drift — ±5 — — ±5 — — ±5 — ppm/°C

External Current — — 1.5 — — 1.5 — — 1.5 mA

DIGITAL OUTPUTS

Logic Levels

Logic "1" +2.4 — — +2.4 — — +2.4 — — Volts

Logic "0" — — +0.4 — — +0.4 — — +0.4 Volts

Logic Loading "1" — — –4 — — –4 — — –4 mA

Logic Loading "0" — — +4 — — +4 — — +4 mA

Delay, Falling Edge of EOC to

Output Data Valid — — 35 — — 35 — — 35 ns

Output Coding Straight Binary

POWER REQUIREMENTS , ±15V

Power Supply Ranges

+15V Supply +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 Volts

–15V Supply –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 Volts

+5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts

Power Supply Currents

+15V Supply — +50 +65 — +50 +65 — +50 +65 mA

–15V Supply — –41 –50 — –41 –50 — –41 –50 mA

+5V Supply — +70 +85 — +70 +85 — +70 +85 mA

Power Dissipation — 1.7 1.9 — 1.7 1.9 — 1.7 1.9 Watts

Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V

POWER REQUIREMENTS, ±12V

Power Supply Ranges

+12V Supply +11.5 +12.0 +12.5 +11.5 +12.0 +12.5 +11.5 +12.0 +12.5 Volts

–12V Supply –11.5 –12.0 –12.5 –11.5 –12.0 –12.5 –11.5 –12.0 –12.5 Volts

+5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts

Power Supply Currents

+12V Supply — +50 +65 — +50 +65 — +50 +65 mA

–12V Supply — –40 –48 — –40 –48 — –40 –48 mA

+5V Supply — +70 +80 — +70 +80 — +70 +80 mA

Power Dissipation — 1.4 1.6 — 1.4 1.6 — 1.4 1.6 Watts

Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V

Footnotes:

➀ All power supplies must be on before applying a start convert pulse. All supplies and

the clock (START CONVERT) must be present during warmup periods. The device

must be continuously converting during this time. There is a slight degradation in

performance when using ±12V supplies.

➁ See Ordering Information for availability of ±5V input range. Contact DATEL for

availability of other input voltage ranges.

➂ A 1MHz clock with a 200ns wide start convert pulse is used for all production testing.

See Timing Diagram for more details.

➄ This is the time required before the A/D output data is valid once the analog input is

back within the speciﬁ ed range.

(SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude

Actual Input Amplitude

6.02

➃ Effective bits is equal to:

1. Obtaining fully speciﬁ ed performance from the ADS-917 requires care-

ful attention to pc-card layout and power supply decoupling. The device's

analog and digital ground systems are connected to each other internally.

For optimal performance, tie all ground pins (14, 19 and 23) directly to a

large analog ground plane beneath the package.

Bypass all power supplies and the REFERENCE OUTPUT (pin 21) to ground

with 4.7F tantalum capacitors. Locate the bypass capacitors as close to

the unit as possible. If the user-installed offset and gain adjusting circuit

shown in Figure 2 is used, also locate it as close to the ADS-917 as pos-

sible.

2. The ADS-917 achieves its speciﬁ ed accuracies without the need for exter-

nal calibration. If required, the device's small initial offset and gain errors

can be reduced to zero using the input circuit of Figure 2. When using this

circuit, or any similar offset and gain-calibration hardware, make adjust-

ments following warmup. To avoid interaction, always adjust offset before

gain.

3. When operating the ADS-917 from ±12V supplies, do not drive external

circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift

speciﬁ cations may not be met, and loading the circuit may cause accuracy

errors within the converter.

4. Applying a start convert pulse while a conversion is in progress (EOC =

logic "1") initiates a new and inaccurate conversion cycle. Data from the

interrupted and subsequent conversions will be invalid.

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 3 of 8

To Pin 20

of ADS-917

–15V

SIGNAL

INPUT

GAIN

ADJUST

1.98k:

50:

+15V

2k:

200k:20k:

–15V

+15V

ZERO/

OFFSET

ADJUST

Figure 2. ADS-917 Calibration Circuit

ADS-917

BIT 1 (MSB)

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12

BIT 13

BIT 14 (LSB)

EOC

ANALOG

INPUT

START

CONVERT

19, 23

0.1F4.7F

+5V

0.1F

4.7F

0.1F

4.7F

–

12V/–15V

+12V/+15V +

0.1F +

4.7F

21 +10V REF. OUT

DIGITAL

GROUND

0 to +10V

ANALOG

GROUND

Figure 3. Typical ADS-917 Connection Diagram

CALIBRATION PROCEDURE (Refer to Figures 2 and 3)

Any offset and/or gain calibration procedures should not be implemented

until devices are fully warmed up. To avoid interaction, offset must be

adjusted before gain. The ranges of adjustment for the circuit of Figure 2

are guaranteed to compensate for the ADS-917's initial accuracy errors

and may not be able to compensate for additional system errors.

All ﬁ xed resistors in Figure 2 should be metal-ﬁ lm types, and multiturn

potentiometers should have TCR’s of 100ppm/°C or less to minimize drift

with temperature.

A/D converters are calibrated by positioning their digital outputs exactly

on the transition point between two adjacent digital output codes. This can

be accomplished by connecting LED's to the digital outputs and adjusting

until certain LED's "ﬂ icker" equally between on and off. Other approaches

employ digital comparators or microcontrollers to detect when the outputs

change from one code to the next.

For the ADS-917, offset adjusting is normally accomplished at the point

where the output bits are 0's and the LSB just changes from a 0 to a 1.

This digital output transition ideally occurs when the applied analog input

is +½ LSB (+305V).

Gain adjusting is accomplished when all bits are 1's and the LSB just

changes from a 1 to a 0. This transition ideally occurs when the analog

input is at +full scale minus 1½ LSB's (+9.999085V).

Zero/Offset Adjust Procedure

1. Apply a train of pulses to the START CONVERT input (pin 16) so the con-

verter is continuously converting. If using LED's on the outputs, a 200kHz

conversion rate will reduce ﬂ icker.

2. Apply +305V to the ANALOG INPUT (pin 20).

3. Adjust the offset potentiometer until the output bits are all 0's and the LSB

ﬂ ickers between 0 and 1.

Gain Adjust Procedure

1. Apply +9.999085V to the ANALOG INPUT (pin 20).

2. Adjust the gain potentiometer until the output bits are all 1's and the LSB

ﬂ ickers between 1 and 0.

Table 2. Output Coding

INPUT VOLTAGE

(0 TO +10V) UNIPOLAR SCALE

DIGITAL OUTPUT

OFFSET

MSB

BINARY

LSB

+9.999390 +FS –1LSB 11 1111 1111 1111

+7.500000 +3/4 FS 11 0000 0000 0000

+5.000000 +1/2 FS 10 0000 0000 0000

+2.500000 +1/4 FS 01 0000 0000 0000

+0.000610 +1LSB 00 0000 0000 0001

0.000000 0 00 0000 0000 0000

Coding is straight binary; 1LSB = 610V.

Table 1. Zero and Gain Adjust

INPUT VOLT-

AGE RANGE

ZERO ADJUST

+½ LSB

GAIN ADJUST

+FS –1½ LSB

0 to +10V +305V +9.999085V

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 4 of 8

Notes: 1. fs = 500kHz.

2. The ADS-917 is an edge-triggered device. All internal operations

are triggered by the rising edge of the start convert pulse, which

may be as narrow as 20nsec. All production testing is performed

at a 1MHz sampling rate with 200nsec wide start pulses. For

lower sampling rates, wider start pulses may be used, however, a

minimum pulse width low of 20nsec must be maintained.

START

CONVERT

OUTPUT

DATA

INTERNAL S/H

NN+1

Data (N – 1) Valid

200ns

typ.

Acquisition Time

10ns typ.

Data N Valid

926ns min.

EOC

90ns typ.

Conversion Time

420ns ±20ns

Invalid

Data

74ns max.

70ns ±10ns

570ns ±40ns

430ns typ.

35ns max.

Hold

926ns min. Invalid

Data

Figure 4. ADS-917 Timing Diagram

devices do not overheat. The ground and power planes beneath the package,

as well as all pcb signal runs to and from the device, should be as heavy as

possible to help conduct heat away from the package.

Electrically-insulating, thermally-conductive "pads" may be installed

underneath the package. Devices should be soldered to boards rather than

"socketed," and of course, minimal air ﬂ ow over the surface can greatly help

reduce the package temperature.

THERMAL REQUIREMENTS

All DATEL sampling A/D converters are fully characterized and speci-

ﬁ ed over operating temperature (case) ranges of 0 to +70°C and –55

to +125°C. All room-temperature (TA = +25°C) production testing is

performed without the use of heat sinks or forced-air cooling. Thermal

impedance ﬁ gures for each device are listed in their respective speciﬁ ca-

tion tables.

These devices do not normally require heat sinks, however, standard

precautionary design and layout procedures should be used to ensure

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 5 of 8

Figure 5. ADS-917 Evaluation Board Schematic

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 6 of 8

Figure 6. ADS-917 FFT Analysis

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

–130

–140

0 50 100 150 200 250 300 350 400 450 500

Frequency (kHz)

(fs = 1MHz, fin = 480kHz, Vin = –0.5dB, 16,384-point FFT)

Amplitude Relative to Full Scale (dB)

Figure 7. ADS-917 Histogram and Differential Nonlinearity

Number of Occurrences

Digital Output Code

016,384

+0.41

–0.33

16,384

DNL (LSB's)

Digital Output Code

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

01 Apr 2011 MDA_ADS-917.B02 Page 7 of 8

MECHANICAL DIMENSIONS INCHES (mm)

ORDERING INFORMATION

MODEL NUMBER OPERATING

TEMP. RANGE ANALOG INPUT ACCESSORIES

ADS-917MC 0 to +70°C Unipolar (0 to +10V) ADS-B916/917 Evaluation Board (without ADS-917)

ADS-917MM –55 to +125°C Unipolar (0 to +10V) HS-24 Heat Sinks for all ADS-917/927 DDIP models

ADS-917GC 0 to +70°C Unipolar (0 to +10V)

Receptacles for PC board mounting can be ordered through AMP Inc.

Part #3-331272-8 (Component Lead Socket), 24 required.

For MIL-STD-883 product speciﬁ cations, contact DATEL.

* For information, see ADS-927 data sheet.

ADS-917GM –55 to +125°C Unipolar (0 to +10V)

ADS-927MC 0 to +70°C Bipolar (±5V)*

ADS-927MM –55 to +125°C Bipolar (±5V)*

ADS-927GC 0 to +70°C Bipolar (±5V)*

ADS-927GM –55 to +125°C Bipolar (±5V)*

ADS-927/883 –55 to +125°C Bipolar (±5V)*

0.200 MAX.

(5.080)

0.235 MAX.

(5.969)

0.600 ±0.010

(15.240)

0.80 MAX.

(20.32)

0.100 TYP.

(2.540)

0.100

(2.540)

0.018 ±0.002

(0.457)

0.100

(2.540)

0.040

(1.016)

1.31 MAX.

(33.27)

112

1.100

(27.940)

0.190 MAX.

(4.826)

0.010

(0.254)

+0.002

–0.001

SEATING

PLANE

0.025

(0.635)

Dimension Tolerances (unless otherwise indicated):

2 place decimal (.XX) ±0.010 (±0.254)

3 place decimal (.XXX) ±0.005 (±0.127)

Lead Material: Kovar alloy

Lead Finish: 50 microinches (minimum) gold plating

over 100 microinches (nominal) nickel plating

PIN 1 INDEX

24-Pin DDIP

Versions

ADS-917MC

ADS-917MM

ADS-927MC

ADS-927MM

ADS-927/883

24-Pin

Surface Mount

Versions

ADS-917GC

ADS-917GM

ADS-927GC

ADS-927GM

0.80 MAX.

(20.32)

0.015

(0.381)

MAX. radius

for any pin

1.31 MAX.

(33.02)

0.100 TYP.

(2.540)

0.100

(2.540)

0.190 MAX.

(4.826)

0.040

(1.016)

0.020 TYP.

(0.508)

0.020

(0.508)

24 13

121

PIN 1

INDEX

0.130 TYP.

(3.302)

Dimension Tolerances (unless otherwise indicated):

2 place decimal (.XX) ±0.010 (±0.254)

3 place decimal (.XXX) ±0.005 (±0.127)

Lead Material: Kovar alloy

Lead Finish: 50 microinches (minimum) gold plating

over 100 microinches (nominal) nickel plating

0.060 TYP.

(1.524)

0.010 TYP.

(0.254)

ADS-917

14-Bit, 1MHz, Low-Power Sampling A/D Converters

. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not

imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁ cations are subject to change

without notice.

www.datel.com • e-mail: help@datel.com

®®

DATEL

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA

ITAR and ISO 9001/14001 REGISTERED

01 Apr 2011 MDA_ADS-917.B02 Page 8 of 8