GENERAL DESCRIPTION
The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. The AD7982 contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

FEATURES
   18-bit resolution with no missing codes
   Throughput: 1 MSPS
   Low power dissipation
      4 mW at 1 MSPS (VDD only)
      7 mW at 1 MSPS (total)
      70 μW at 10 kSPS
   INL: ±1 LSB typical, ±2 LSB maximum
   Dynamic range: 99 dB typical
   True differential analog input range: ±VREF
      0 V to VREF with VREF between 2.5 V to 5.0 V
      Allows use of any input range
      Easy to drive with the ADA4941-1 or ADA4940-1
   No pipeline delay
   Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and 5 V
      logic interface
   Proprietary serial interface SPI-/QSPI™/ MICROWIRE™-/
      DSP-compatible1
   Ability to daisy-chain multiple ADCs and busy indicator
   10-Lead MSOP and 3 mm × 3 mm 10-Lead LFCSP

APPLICATIONS
   Battery-powered equipment
   Data acquisition systems
   Medical instruments
   Seismic data acquisition systems