The AD7175-2 device from Analog Devices is a low noise (capable of 24 noise free bits), fast settling, multiplexed, 2-/4-channel (fully/pseudo differential) Sigma Delta analog-to-digital converter (ADC) for low bandwidth inputs. With a maximum channel scan rate of 50 kSPS (20 μs) for fully settled data and an output data rates range from 5 SPS to 250 kSPS, the AD7175-2 integrates key analog and digital signal conditioning blocks to allow users to configure an individual setup for each analog input channel in use. Each feature can be user selected on a per channel basis. The AD7175-2 Sigma Delta ADC has integrated true rail-to-rail buffers on the analog inputs and external reference inputs providing easy to drive high impedance inputs whilst a precision 2.5 V low drift (2 ppm/°C) band gap internal reference (with output reference buffer) adds embedded functionality to reduce external component count. Flexibility is enhanced further with an integrated digital filter providing simultaneous 50 Hz/60 Hz rejection at 27.27 SPS output data rate allowing users to switch between different filter options according to the demands of each channel in the application, the ADC automatically switches through each selected channel. Other integrated digital processing functions include offset and gain calibration registers, configurable on a per channel basis.
The AD7175-2 is supplied in a 24-lead TSSOP package and operates with a 5 V AVDD1, or ±2.5 V AVDD1/AVSS, and 2 V to 5 V AVDD2 and IOVDD supplies, the specified operating temperature range is −40°C to +105°C.
Functional block diagram for AD7902
The AD7175-2 Sigma Delta ADC is suitable for use in a wide range of applications including Process control PLC/DCS modules, Temperature and pressure measurement, Medical and scientific multichannel instrumentation and Chromatography.
The AD7175-2 Sigma Delta ADC is supported by the fully featured evaluation board, EVAL-AD7175-2SDZ, this board operates in stand-alone mode or in conjunction with the System Development Platform, EVAL-SDP-CB1Z . When operated with the System Development Platform software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the System Development Platform . When operated in standalone mode the ADZS-BRKOUT-EX3 break out board is also recommended for access to various control pins.
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