AD7902 Dual Pseudo Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP

The AD7902 is a dual 16-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDDx, per ADC. It contains two low power, high speed, 16-bit sampling ADCs and a versatile serial port interface (SPI). On the CNVx rising edge, the AD7902 samples an analog input, IN+ in the range of 0 V to VREF with respect to a ground sense, IN−. The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput.

Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIOx supplies.

The AD7902 is available in a 20-lead QSOP package with operation specified from −40°C to +125°C.

APPLICATIONS

Battery-powered equipment
Communications
Automated test equipment (ATE)
Data acquisition
Medical instrumentation
Redundant measurement
Simultaneous sampling

Features and Benefits

16-bit resolution with no missing codes
Throughput: 1 MSPS
Lowpower dissipation
7.0 mW at 1 MSPS (V_DD1 and V_DD2 only)
12.0 mW at 1 MSPS (total)
140 µW at 10 kSPS
INL: ±1.0 LSB typical, ±2.5 LSB maximum
Pseudodifferential analog input range
0 V to VREF with V_REF between
2.4 V to 5.1 V
Allows use of any input range
Easy to drive with the ADA4841-1/ADA4841-2

SINAD: 91 dB at 1 kHz
THD: −105 dB at 1 kHz
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
Serial port interface (SPI) QSPI/MICROWIRE/DSP compatible
20-lead QSOP package
Wide operating temperature range: −40°C to +125°C

Analog to Digital Converters

A/D Converters

IBIS Models

AD7902 IBIS Model .IBS

Data Sheets

Document	note
AD7902: Dual Pseudo Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP Data Sheet (Rev. B)	PDF 1649 kB

Application Notes

Document	note
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)	PDF 363 kB
AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B)	PDF 401 kB
AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)	PDF 299 kB
AN-877: Interfacing to High Speed ADCs via SPI (Rev. A)	PDF 1594 kB