GENERAL DESCRIPTION
●The AD7191 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) ADC. The on-chip low noise gain stage means that signals of small amplitude can be interfaced directly to the ADC. It contains two differential analog inputs. The part also includes a temperature sensor that can be used for temperature compensation.
●FEATURES
●Pin-programmable output rate
●Output data rate: 10 Hz, 50 Hz, 60 Hz, 120 Hz
●Pin-programmable PGA
●Gain: 1, 8, 64, 128
●Pin-programmable power-down and reset
●RMS noise: 15 nV @ 10 Hz (gain = 128)
●Up to 21.5 noise free bits (gain = 1)
●Internal or external clock
●Bridge power-down switch
●Offset drift: 5 nV/°C
●Gain drift: 1 ppm/°C
●Specified drift over time
●Simultaneous 50 Hz/60 Hz rejection
●Internal temperature sensor
●Power supply: 3 V to 5.25 V
●Current: 4.35 mA
●Temperature range: –40°C to +105°C
●Package: 24-lead TSSOP
●INTERFACE
●2-wire serial
●SPI, QSPI™, and MICROWIRE™ compatible
●Schmitt trigger on SCLK
●APPLICATIONS
●Weigh scales
●Strain gauge transducers
●Pressure measurement
●Medical and scientific instrumentation
