GENERAL DESCRIPTION
The AD7190 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (∑-Δ) analog to digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can be interfaced directly to the ADC.

FEATURES
RMS noise: 8.5 nV @ 4.7 Hz (gain = 128)
16 noise free bits @ 2.4 kHz (gain = 128)
Up to 22.5 noise free bits (gain = 1)
Offset drift: 5 nV/°C
Gain drift: 1 ppm/°C
Specified drift over time
2 differential/4 pseudo differential input channels
Automatic channel sequencer
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: 4.75 V to 5.25 V
   DVDD: 2.7 V to 5.25 V
Current: 6 mA
Temperature range: –40°C to +105°C
Interface
   3-wire serial
   SPI, QSPI™, MICROWIRE™, and DSP compatible
   Schmitt trigger on SCLK

APPLICATIONS
Weigh scales
Strain gauge transducers
Pressure measurement
Temperature measurement