Description

The AD7175-2 is a low noise, fast settling, multiplexed, 2-/4-channel (fully/pseudo differential) Σ-Δ analog-to-digital converter(ADC) for low bandwidth inputs. It has a maximum channelscan rate of 50 kSPS (20 µs) for fully settled data. The outputdata rates range from 5 SPS to 250 kSPS.The AD7175-2 integrates key analog and digital signal conditioningblocks to allow users to configure an individual setup foreach analog input channel in use. Each feature can be user selectedon a per channel basis. Integrated true rail-to-rail buffers on theanalog inputs and external reference inputs provide easy to drivehigh impedance inputs. The precision 2.5 V low drift (2 ppm/°C)band gap internal reference (with output reference buffer) addsembedded functionality to reduce external component count.The digital filter allows simultaneous 50 Hz/60 Hz rejection at27.27 SPS output data rate. The user can switch betweendifferent filter options according to the demands of eachchannel in the application. The ADC automatically switchesthrough each selected channel. Further digital processingfunctions include offset and gain calibration registers,configurable on a per channel basis.The device operates with a 5 V AVDD1, or ±2.5 V AVDD1/AVSS,and 2 V to 5 V AVDD2 and IOVDD supplies. The specifiedoperating temperature range is −40°C to +105°C. The AD7175-2 isin a 24-lead TSSOP package.Applications Process control: PLC/DCS modules Temperature and pressure measurement Medical and scientific multichannel instrumentation Chromatography