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
   High performance
      True differential analog input range: ±VREF
         0 V to VREF with VREF between 2.5 V to 5 V
         Easy to drive with the ADA4941-1 or ADA4940-1
      Throughput: 1 MSPS
         Zero latency architecture
      18-bit resolution with no missing codes
      INL: ±1 LSB typical, ±2 LSB maximum
      Dynamic range: 99 dB, VREF = 5 V
      SNR: 98 dB at fIN = 1 kHz, VREF = 5 V
      THD: −119 dB at fIN = 1 kHz, VREF = 5 V
      SINAD: 97 dB at fIN = 1 kHz, VREF = 5 V
   Low power dissipation
      Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and
         5 V logic interface
      4 mW at 1 MSPS (VDD only)
      7 mW at 1 MSPS (total)
      70 μW at 10 kSPS
   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
   Wide operating temperature range: −40°C to +85°C

APPLICATIONS
   Automated test equipment
   Data acquisition systems
   Medical instruments
   Machine automation