GENERAL DESCRIPTION
The AD7194 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can interface directly to the ADC.

FEATURES
Fast settling filter option
8 differential/16 pseudo differential input channels
RMS noise: 11 nV at 4.7 Hz (gain = 128)
15.5 noise-free bits at 2.4 kHz (gain = 128)
Up to 22 noise-free bits (gain = 1)
Offset drift: ±5 nV/°C
Gain drift: ±1 ppm/°C
Programmable gain (1 to 128)
Output data rate: 4.7 Hz to 4.8 kHz
Internal or external clock
Simultaneous 50 Hz/60 Hz rejection
4 general-purpose digital outputs
Power supply
   AVDD: 3 V to 5.25 V
   DVDD: 2.7 V to 5.25 V
Current: 4.65 mA
Temperature range: −40°C to +105°C
Package: 32-lead LFCSP
Interface
   3-wire serial
   SPI, QSPI™, MICROWIRE™, and DSP compatible
   Schmitt trigger on SCLK

APPLICATIONS
PLC/DCS analog input modules
Data acquisition
Strain gage transducers