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
   18-bit resolution with no missing codes
   Throughput: 1.33 MSPS
   Low power dissipation: 10.5 mW at 1.33 MSPS
   INL: ±2.25 LSB maximum
   Dynamic range: 99.7 dB typical
   True differential analog input range: ±VREF
      0 V to VREF with VREF between 2.9 V to 5.0 V
      Allows use of any input range
      Easy to drive with the ADA4941
   No pipeline delay
   Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
      interface
   Proprietary serial interface
      SPI/QSPI/MICROWIRE™/DSP compatible
   Ability to daisy-chain multiple ADCs and busy indicator
   10-lead MSOP (MSOP-8 size) and 10-lead 3 mm × 3 mm
   LFCSP, SOT-23 size

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