GENERAL DESCRIPTION
The AD7782 is a complete analog front end for low-frequency measurement applications. The 24-bit sigma-delta ADC contains two fully differential analog input channels that can be configured with a gain of 1 or 16 allowing full-scale input signal ranges of ±2.56 V or ± 160 mV from a +2.5 V differential reference input.

FEATURES
   2-Channel, 24-Bit Σ-Δ ADC
      Pin Configurable (No Programmable Registers)
      Pin Selectable Input Channels
      Pin Programmable Input Ranges (±2.56 V or ±160 mV)
   Fixed 19.79 Hz Update Rate
   Simultaneous 50 Hz and 60 Hz Rejection
   24-Bit No Missing Codes
   18.5-Bit p-p Resolution (±2.56 V Range)
   16.5-Bit p-p Resolution (±160 mV Range)

   INTERFACE
   Master or Slave Mode of Operation
   Slave Mode
      3-Wire Serial
      SPI™, QSPI™, MICROWIRE™, and DSP-Compatible
      Schmitt Trigger on SCLK

   POWER
   Specified for Single 3 V and 5 V Operation
   Normal: 1.3 mA @ 3 V
   Power-Down: 9 μA

   ON-CHIP FUNCTIONS
   Rail-Rail Input Buffer and PGA

APPLICATIONS
   Sensor Measurement
   Industrial Process Control
   Temperature Measurement
   Pressure Measurements
   Weigh Scales
   Portable Instrumentation