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