AD7731
PRODUCTIONLow Noise, High Throughput 24-Bit Sigma-Delta ADC
- Part Models
- 6
- 1ku List Price
- Starting From $16.01
Part Details
- 24-Bit Sigma-Delta ADC
- 16 Bits p-p Resolution at 800 Hz Output Rate
- Programmable Output Rates up to 6.4 kHz
- Programmable Gain Front End
- ±0.0015% Nonlinearity
- Buffered Differential Inputs
- Programmable Filter Cutoffs
- FASTStep™ Mode for Channel Sequencing
- Single Supply Operation
The AD7731 is a complete analog front-end for process control applications. The device has a proprietary programmable gain front end that allows it to accept a range of input signal ranges, including low level signals, directly from a transducer. The sigma-delta architecture of the part consists of an analog modulator and a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.
The part features three buffered differential programmable gain analog inputs (which can be configured as five pseudo-differential inputs), as well as a differential reference input. The part operates from a single +5 V supply and accepts seven unipolar analog input ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV and +1.28 V, and seven bipolar ranges: ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and ±1.28 V. The peak-to-peak resolution achievable directly from the part is 16 bits at an 800 Hz output rate. The part can switch between channels with 1 ms settling time and maintain a performance level of 13 bits of peak-to-peak resolution.
The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7731 contains self-calibration and system calibration options and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.
The part is available in a 24-lead plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.
APPLICATIONS
- Process Control
- PLCs/DCS
- Industrial Instrumentation
Documentation
Data Sheet 1
Application Note 8
Technical Articles 4
Evaluation Design File 1
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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7731BNZ | 24-Lead PDIP | ||
| AD7731BRUZ | 24-Lead TSSOP | ||
| AD7731BRUZ-REEL7 | 24-Lead TSSOP | ||
| AD7731BRZ | 24-Lead SOIC (Wide) | ||
| AD7731BRZ-REEL | 24-Lead SOIC (Wide) | ||
| AD7731BRZ-REEL7 | 24-Lead SOIC (Wide) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
| No Match Found | ||
|
Mar 7, 2019 - 19_0046 Assembly Transfer of 18,20,24,28 Lead PDIP to Cirtek |
||
| AD7731BNZ | PRODUCTION | |
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
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| AD7731BNZ | PRODUCTION | |
|
Aug 10, 2021 - 21_0035 Amkor Philippines as an Alternate Site for TSSOP_4.4 |
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| AD7731BRUZ | PRODUCTION | |
| AD7731BRUZ-REEL7 | PRODUCTION | |
|
Jan 20, 2012 - 11_0218 Halogen Free Material Change for Certain TSSOP Products at Carsem |
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| AD7731BRUZ | PRODUCTION | |
| AD7731BRUZ-REEL7 | PRODUCTION | |
|
Aug 4, 2010 - 10_0117 Halogen Free Material Change for SOIC_W Products at Carsem |
||
| AD7731BRZ | PRODUCTION | |
| AD7731BRZ-REEL | PRODUCTION | |
| AD7731BRZ-REEL7 | PRODUCTION | |
|
Feb 8, 2010 - 04_0080 Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland. |
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| AD7731BRZ | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
AD7731 Code Examples 2
Evaluation Software 0
Can't find the software or driver you need?
Tools & Simulations
Design Tool 1
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open ToolEvaluation Kits
AD7731 Evaluation Kit