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AD7177-2
32-Bit, 10 kSPS, Sigma-Delta ADC with 100 µs Settling and True Rail-to-Rail Buffers
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Overview
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
- INL: ±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
- See data sheet for additional features
Product Details
The AD7177-2 is a 32-bit 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 channel scan rate of 10 kSPS (100 µs) for fully settled data. The 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. Integrated true rail-to-rail buffers on the analog inputs and external reference inputs provide easy to drive high impedance inputs. The 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.
The digital filter allows simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application. The ADC automatically switches through each selected channel. Further digital processing functions include offset and gain calibration registers, configurable on a per channel basis.
The device operates with a 5 V AVDD1 supply, or with ±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. The AD7177-2 is available in a 24-lead TSSOP package.
Applications
- Process control: PLC/DCS modules
- Temperature and pressure measurement
- Medical and scientific multichannel instrumentation
- Chromatography
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Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
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Product Recommendations
AD7177-2 Companion Parts
Recommended Digital Isolators
- For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V): ADUM3481.
- For SPI Interface, low power, 5.0 kVrms isolation: ADUM4401.
- For SPI Interface, lowest power, 2.5 kVrms isolation: ADUM1401.
- For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation: ADUM3401.
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Informational (1)
Digital Filters Sinc3 V's Sinc4 Differences and Trade Offs
Precision Sigma Delta Filtering Tutorial
Virtual Evaluation (VE) Tutorial
AD7175 Family Precision Sigma Delta ADCs (w/o audio)
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