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Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC
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Overview
Features and Benefits
- Low power, 8-/16-channel, highly integrated multiplexed analog-to-digital converter (ADC)
- Integration
- Precision analog input buffers and reference input buffers
- 2.5 V precision reference (3.5 ppm/°C)
- Cross point multiplexer (enable system diagnostic)
- 8 full differential or 16 single-ended channels
- Clock oscillator
- GPIO and GPO pins with automatic external mux control
- Fast and flexible output rate: 1.25 SPS to 31.25 kSPS
- Channel scan data rate: 6.21 kSPS/channel (161 μs settling)
- Performance specifications
- 17.5 noise free bits at 31.25 kSPS
- 24 noise free bits at 1.25 SPS
- INL: ±3 ppm/FSR
- 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
- Operates with either 3.3 V or 5 V supply
- Single supply
- 3.3 V or 5 V AVDD1, 2 V to 5 V AVDD2, and 2 V to 5 V IOVDD
- Optional split supply
- AVDD1 and AVSS ± 2.5 V or AVDD1 and AVSS ± 1.65 V
- Current: 1.4 mA
- Single supply
- 3-/4-wire serial digital interface (Schmitt trigger on SCLK)
- CRC error checking
- SPI, QSPI, MICROWIRE, and DSP compatible
- Package: 40-lead 6 mm × 6 mm LFCSP
- Temperature range: −40°C to +105°C
Product Details
Fast settling, highly accurate, low power, 8-/16-channel, multiplexed ADC for low bandwidth input signals with integrated input buffers.
Integrated precision, 2.5 V, low drift (3.5 ppm/°C), band gap reference and integrated oscillator.
Eight flexible setups with configurability for output data rate, digital filter mode, offset/gain error correction, reference selection, buffer enables and more. This per channel configurability extends to the output data rate used for each channel when using sinc5 + sinc1 filter.
Sinc5 + sinc1 filter maximizes channel scan rate, and sinc3 filter maximizes resolution and enhanced 50 Hz/60 Hz rejection, with four selectable options to maximize rejection.
Integrated diagnostic features, including CRC, register checksum, temperature sensor, crosspoint multiplexer, burnout currents, and GPIOs/GPOs.
Applications
- Process control: PLC/DCS modules
- Voltage, current, temperature, and pressure measurement
- Flow meters
- Medical and scientific multichannel instrumentation
- Seismic instrumentation
- Chemical analysis instrumentation: chromatography
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Product Lifecycle
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.
Evaluation Kits (1)
Documentation
Technical Books (1)
Software & Systems Requirements
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Tools & Simulations
Virtual Eval - BETA
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IBIS Models
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Reference Designs (2)
Product Recommendations
AD7173-8 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.
Recommended Power Solutions
Reference Materials
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)
Analog Dialogue (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
