Datasheet AD7902 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual Pseudo Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP |
| Pages / Page | 29 / 1 — Dual Pseudo Differential 16-Bit, 1 MSPS. PulSAR ADC 12.0 mW in QSOP. Data … |
| Revision | B |
| File Format / Size | PDF / 691 Kb |
| Document Language | English |
Dual Pseudo Differential 16-Bit, 1 MSPS. PulSAR ADC 12.0 mW in QSOP. Data Sheet. AD7902. FEATURES. GENERAL DESCRIPTION
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Dual Pseudo Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP Data Sheet AD7902 FEATURES GENERAL DESCRIPTION 16-bit resolution with no missing codes
The AD7902 is a dual 16-bit, successive approximation, analog-
Throughput: 1 MSPS
to-digital converter (ADC) that operates from a single power
Low power dissipation
supply, VDDx, per ADC. It contains two low power, high speed,
7.0 mW at 1 MSPS (V and V only) DD1 DD2
16-bit sampling ADCs and a versatile serial port interface (SPI).
12.0 mW at 1 MSPS (total)
On the CNVx rising edge, the AD7902 samples an analog input,
140 µW at 10 kSPS
IN+, in the range of 0 V to VREF with respect to a ground sense,
INL: ±1.0 LSB typical, ±2.5 LSB maximum
IN−. The external y applied reference voltage of the REFx pins
SINAD: 91 dB at 1 kHz
(VREF) can be set independently from the supply voltage pins,
THD: −105 dB at 1 kHz
VDDx. The power of the device scales linearly with throughput.
Pseudo differential analog input range
Using the SDIx inputs, the SPI-compatible serial interface can
0 V to VREF with VREF between 2.4 V to 5.1 V
also daisy-chain multiple ADCs on a single 3-wire bus and provide
Allows use of any input range
an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V,
Easy to drive with the ADA4841-1/ ADA4841-2
or 5 V logic, using the separate VIOx supplies.
No pipeline delay Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
The AD7902 is available in a 20-lead QSOP package with
interface
operation specified from −40°C to +125°C.
Serial port interface (SPI) QSPI/MICROWIRE/DSP compatible Table 1. MSOP 14-/16-/18-Bit PulSAR® ADCs 20-lead QSOP package 400 kSPS Wide operating temperature range: −40°C to +125°C Bits 100 kSPS 250 kSPS to 500 kSPS 1000 kSPS ADC Driver APPLICATIONS
18 AD76911 AD76901 AD79821 ADA4941-1 ADA4841-1
Battery-powered equipment
ADA4841-2
Communications
16 AD7680 AD76851 AD76861 AD79801 ADA4941-1
Automated test equipment (ATE)
AD7683 AD76871 AD76881 AD7903 ADA4841-1
Data acquisition
AD7684 AD7694 AD76931 AD7902 ADA4841-2
Medical instrumentation
14 AD7940 AD79421 AD79461
Redundant measurement
1 Pin-for-pin compatible.
Simultaneous sampling FUNCTIONAL BLOCK DIAGRAM REF = 2.5V TO 5V 2.5V REF1 REF2 VDD1 VDD2 VIO1 VIO1/VIO2 0V TO VREF IN1+ SDI1 SDI1/SDI2 ADC1 SCK1 SCK1/SCK2 CNV1 CNV1/CNV2 IN1– SDO1 SDO1 VIO2 0V TO VREF IN2+ 3-WIRE OR 4-WIRE SDI2 INTERFACE ADC2 SCK2 (SPI, CS, AND CHAIN MODES) CNV2 IN2– SDO2 SDO2 GND AD7902
001 1756- 1 Figure 1.
Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2014–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT POWER SUPPLY DIGITAL INTERFACE CS MODE /CS Mode, 3-Wire Interface Without Busy Indicator /CS Mode, 3-Wire Interface with Busy Indicator /CS Mode, 4-Wire Interface Without Busy Indicator /CS Mode, 4-Wire Interface with Busy Indicator CHAIN MODE Chain Mode Without Busy Indicator Chain Mode with Busy Indicator APPLICATIONS INFORMATION SIMULTANEOUS SAMPLING FUNCTIONAL SAFTEY CONSIDERATIONS LAYOUT EVALUATING PERFORMANCE OF THE AD7902 OUTLINE DIMENSIONS ORDERING GUIDE NOTES
The AD7902 is a dual 16-bit, successive approximation, analog-
Throughput: 1 MSPS
to-digital converter (ADC) that operates from a single power
Low power dissipation
supply, VDDx, per ADC. It contains two low power, high speed,
7.0 mW at 1 MSPS (V and V only) DD1 DD2
16-bit sampling ADCs and a versatile serial port interface (SPI).
12.0 mW at 1 MSPS (total)
On the CNVx rising edge, the AD7902 samples an analog input,
140 µW at 10 kSPS
IN+, in the range of 0 V to VREF with respect to a ground sense,
INL: ±1.0 LSB typical, ±2.5 LSB maximum
IN−. The external y applied reference voltage of the REFx pins
SINAD: 91 dB at 1 kHz
(VREF) can be set independently from the supply voltage pins,
THD: −105 dB at 1 kHz
VDDx. The power of the device scales linearly with throughput.
Pseudo differential analog input range
Using the SDIx inputs, the SPI-compatible serial interface can
0 V to VREF with VREF between 2.4 V to 5.1 V
also daisy-chain multiple ADCs on a single 3-wire bus and provide
Allows use of any input range
an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V,
Easy to drive with the ADA4841-1/ ADA4841-2
or 5 V logic, using the separate VIOx supplies.
No pipeline delay Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
The AD7902 is available in a 20-lead QSOP package with
interface
operation specified from −40°C to +125°C.
Serial port interface (SPI) QSPI/MICROWIRE/DSP compatible Table 1. MSOP 14-/16-/18-Bit PulSAR® ADCs 20-lead QSOP package 400 kSPS Wide operating temperature range: −40°C to +125°C Bits 100 kSPS 250 kSPS to 500 kSPS 1000 kSPS ADC Driver APPLICATIONS
18 AD76911 AD76901 AD79821 ADA4941-1 ADA4841-1
Battery-powered equipment
ADA4841-2
Communications
16 AD7680 AD76851 AD76861 AD79801 ADA4941-1
Automated test equipment (ATE)
AD7683 AD76871 AD76881 AD7903 ADA4841-1
Data acquisition
AD7684 AD7694 AD76931 AD7902 ADA4841-2
Medical instrumentation
14 AD7940 AD79421 AD79461
Redundant measurement
1 Pin-for-pin compatible.
Simultaneous sampling FUNCTIONAL BLOCK DIAGRAM REF = 2.5V TO 5V 2.5V REF1 REF2 VDD1 VDD2 VIO1 VIO1/VIO2 0V TO VREF IN1+ SDI1 SDI1/SDI2 ADC1 SCK1 SCK1/SCK2 CNV1 CNV1/CNV2 IN1– SDO1 SDO1 VIO2 0V TO VREF IN2+ 3-WIRE OR 4-WIRE SDI2 INTERFACE ADC2 SCK2 (SPI, CS, AND CHAIN MODES) CNV2 IN2– SDO2 SDO2 GND AD7902
001 1756- 1 Figure 1.
Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2014–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT POWER SUPPLY DIGITAL INTERFACE CS MODE /CS Mode, 3-Wire Interface Without Busy Indicator /CS Mode, 3-Wire Interface with Busy Indicator /CS Mode, 4-Wire Interface Without Busy Indicator /CS Mode, 4-Wire Interface with Busy Indicator CHAIN MODE Chain Mode Without Busy Indicator Chain Mode with Busy Indicator APPLICATIONS INFORMATION SIMULTANEOUS SAMPLING FUNCTIONAL SAFTEY CONSIDERATIONS LAYOUT EVALUATING PERFORMANCE OF THE AD7902 OUTLINE DIMENSIONS ORDERING GUIDE NOTES
