GENERAL DESCRIPTION
The AD79851 is a 16-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 16-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7985 samples an analog input, IN+, between 0 V and REF with respect to a ground sense, IN−. The AD7985 features a very high sampling rate turbo mode (TURBO is high) and a reduced power normal mode (TURBO is low) for low power applications where the power is scaled with the throughput.

FEATURES
   16-bit resolution with no missing codes
   Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
   Low power dissipation
      15.5 mW at 2.5 MSPS, with external reference
      28 mW at 2.5 MSPS, with internal reference
   INL: ±0.7 LSB typical, ±1.5 LSB maximum
   SNR
      88.5 dB, with on-chip reference
      90 dB, with external reference
   4.096 V internal reference: typical drift of ±10 ppm/°C
   Pseudo differential analog input voltage range
      0 V to VREF with VREF up to 5.0 V
      Allows use of any input range
   No pipeline delay
   Logic interface: 1.8 V/2.5 V/2.7 V
   Proprietary serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible1
   Ability to daisy-chain multiple ADCs with busy indicator
   20-lead, 4 mm × 4 mm LFCSP

APPLICATIONS
   Battery-powered equipment
   Communications
   ATE
   Data acquisition systems
   Medical instruments