GENERAL DESCRIPTION
The AD79841 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 and a versatile serial interface port. On the CNV rising edge, the AD7984 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, REF, is applied externally and can be set independent of the supply voltage, VDD.

FEATURES
   High performance
      True differential analog input range: ±VREF
         0 V to VREF with VREF between 2.9 V to 5 V
         Easy to drive with the ADA4941
      Throughput: 1.33 MSPS
         Zero latency architecture
      18-bit resolution with no missing codes
      INL: ±2.25 LSB maximum
      Dynamic range: 99.7 dB, VREF = 5 V
      SNR: 98.5 dB at fIN = 1 kHz, VREF = 5 V
      THD: −110.5 dB at fIN = 1 kHz, VREF = 5 V
      SINAD: 97.5 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/5 V
         logic interface
      5.3 mW at 1.33 MSPS (VDD only)
      10.5 mW at 1.33 MSPS (total)
      80 μW at 10 kSPS
   Proprietary serial interface
      SPI/QSPI/MICROWIRE™/DSP compatible
   Ability to daisy-chain multiple ADCs and busy indicator
   10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP
   Wide operating temperature range: −40°C to +85°C

APPLICATIONS
   Automated test equipment
   Data acquisition systems
   Medical instruments
   Machine automation