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AD7791: Low Power, Buffered 24-Bit Sigma-Delta ADC Data Sheet (Rev. A)9/28/2006PDF308 kB
Alternative Parts
AD7124-4
Lower power and lower noise, completed signal chain integration with diagnostic features for functional safety, easier evaluation and reduced design time
Overview
Features and Benefits
- Power
Supply: 2.5 V to 5.25 V operation
Normal: 75 µA maximum
Power-down: 1 µA maximum - RMS noise: 1.1 µV at 9.5 Hz update rate
- 19.5-bit p-p resolution (22 bits effective resolution)
- Integral nonlinearity: 3.5 ppm typical
- Simultaneous 50 Hz and 60 Hz rejection
- Internal clock oscillator
- Rail-to-rail input buffer
- VDD monitor channel
- Temperature range: –40°C to +105°C
- 10-lead MSOP
Product Details
The AD7790/AD7791 are low-power, complete analog front ends for low frequency measurement applications. The device consumes 65 µA of current typically when operated with a 3 V power supply and 75 µA typical when operated with a 5 V power supply with the buffer disabled. The AD7791 contains a 24-bit S-D ADC with one differential input, which can be buffered or unbuffered. The AD7790 is a 16-bit version of the AD7791. The AD7790 has a peak-to-peak resolution of 16 bits at the default output data rate of 16.6 Hz while the AD7789 has a peak to peak resolution of 19 bits, which is equivalent to an effective resolution of 21.5 bits at this output data rate.
The device operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate from the part is software programmable, allowing rates from 9.5 Hz to 120 Hz. The p-p resolution from the part varies with the programmed output data rate. With an output data rate of 16.6 Hz, simultaneous 50 Hz/60 Hz rejection is achieved. Power supply monitoring is also included.
The part can be used in single conversion mode whereby the device powers up, performs a single conversion and then returns to powerdown mode. Alternatively, it can be operated in continuous mode. In continuous conversion mode, the part can be configured to continuously read i.e. the conversions are placed on the serial bus automatically as soon as a conversion is complete (the user does not need to write to the ADC to read the data), assuming that the serial clock is applied to the device.
The AD7790/AD7791 is housed in a 10-lead MSOP package.
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015PDF76 K
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AN-968: Current Sources: Options and Circuits (Rev. 0)10/22/2008PDF131 kB
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AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008PDF217 kB
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AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006PDF222 kB
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AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004PDF70 kB
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AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002PDF149 kB
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UG-827: Evaluating the AD7791 24-Bit, Low Power, Sigma-Delta ADC5/19/2015PDF857 K
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FAQs7/26/2017
Software & Systems Requirements
Device Drivers
Tools & Simulations
Design Tools
XLS
AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model
280.5 K
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Reference Designs (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.
PCN-PDN Information
Support & Discussions
AD7791 Discussions
RE: ADRV9002 Kernel Module Support
23 week(s) ago in Linux Software Drivers
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.