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
