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Introducing the AD7177-2 32 bit Sigma Delta ADC from Analog Devices
The AD7177-2 device from Analog Devices is a low noise, 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 10 kSPS (100 µs) for fully settled data and an output data rates range from 5 SPS to 10 kSPS, the AD7177-2 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 AD7177-2 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 AD7177-2 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.
AD7177-2 Functional Block Diagram
Features and Benefits
- 32-bit data output
- Fast and flexible output rate: 5 SPS to 10 kSPS
- Channel scan data rate of 10 kSPS/channel (100 µs settling)
- Performance specifications
- 19.1 noise free bits at 10 kSPS
- 20.2 noise free bits at 2.5 kSPS
- 24.6 noise free bits at 5 SPS
- NL: ±1 ppm of FSR
- 85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling
- User configurable input channels; 2 fully differential channels or 4 single-ended channels
- Crosspoint multiplexer
- On-chip 2.5 V reference (±2 ppm/°C drift)
- True rail-to-rail analog and reference input buffers
- Internal or external clock
The AD7177-2 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.
Click here to view the datasheet for the AD7177-2
Click here for more information or buy from Anglia Live
Anglia are offering customers FREE samples of the AD7177-2, please fill in the form below to request yours now.
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For more information, or details on the full range of Analog Devices products available from Anglia, please email info@anglia.com
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This news article was originally published in June 2015.
