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GENERAL DESCRIPTION

The AD76901 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN? pins. The voltages on these pins swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.

FEATURES

18-bit resolution with no missing codes

Throughput: 400 kSPS

INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR)

Dynamic range: 102 dB at 400 kSPS

Oversampled dynamic range: 125 dB at 1 kSPS

Noise-free code resolution: 20 bits at 1 kSPS

Effective resolution: 22.7 bits at 1 kSPS

SINAD: 101.5 dB at 1 kHz

THD: ?125 dB at 1 kHz

True differential analog input range: ±VREF

0 V to VREF with VREF up to VDD on both inputs

No pipeline delay

Single-supply 5 V operation with

1.8 V/2.5 V/3 V/5 V logic interface

Proprietary serial interface

SPI/QSPI/MICROWIRE?/DSP compatible

Daisy-chain multiple ADCs and busy indicator

Power dissipation

4.25 μW at 100 SPS

4.25 mW at 100 kSPS

Standby current: 1 nA

10-lead package: MSOP (MSOP-8 size) and

3 mm × 3 mm LFCSP (SOT-23 size)

Pin-for-pin compatible with LFCSP/MSOP PulSAR ADCs

APPLICATIONS

Battery-powered equipment

Data acquisition

Seismic data acquisition systems

DVMs

Instrumentation

Medical instruments