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AD7790:  16-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter

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.

FEATURES and BENEFITS

  • Power
    - Supply: 2.5 V to 5.25 V operation
    - Normal: 75 µA maximum
    - Power-down: 1 µA maximum
  • 16-bit p-p resolution
  • Integral nonlinearity: 3.5 ppm typical
  • Simultaneous 50 Hz and 60 Hz rejection
  • Internal clock oscillator
  • Programmable gain amplifier
  • Rail-to-rail input buffer
  • VDD monitor channel
  • Temperature range: –40°C to +105°C
  • 10-lead MSOP

Functional Block Diagram for AD7790

New Document Type:

PDF

AD7790 Condensed Review (pdf)
A 6-page, concise, clear and downloadble brief on the AD7790.

Documentation

Title Content Type File Type
AD7790: Low Power, 16-Bit Buffered Sigma-Delta ADC Data Sheet  (Rev A, 03/2013) (pdf, 299 kB)
  • AD7790 Key Sheet  (pdf, 123 kB)
    A 6-page, concise, clear and downloadable brief on the AD7790.
Data Sheets PDF
AN-968: Current Sources: Options and Circuits  (pdf, 131 kB) Application Notes PDF
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging  (pdf, 217 kB) Application Notes PDF
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC  (pdf, 222 kB) Application Notes PDF
AN-615: Peak-to-Peak Resolution Versus Effective Resolution  (pdf, 70 kB)
This application note describes effective resolution and peak-to-peak resolution and highlights the difference between these two specifications.
Application Notes PDF
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:  (pdf, 149 kB)
The Most Common Causes and the Associated Fixes to Prevent Reoccurrence
Application Notes PDF
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change  (pdf, 76 kB) Application Notes PDF
CN-0271:K-Type Thermocouple Measurement System with Integrated Cold Junction Compensation  (pdf, 565 kB) Circuit Note PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
(Electronic Design, 1/12/06)
Technical Articles HTML
Circuit Provides ISFET-Sensor Bias
by Brian Harrington, Analog Devices, Inc. (EDN Design Idea, 6/10/2004)
Technical Articles HTML
Flea-Power 24-Bit A/Ds Tout Microvolt Noise Levels
(ChipCenter Product Review)
Product Reviews HTML
RAQs index Rarely Asked Questions HTML
FAQs for the AD779x family. FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Utilities and Conversions HTML
Digital Filter Model Spreadsheets
These spreadsheet tools show the response of the digital filter section of the AD71xx and AD77xx devices based on input parameters.
Design Calculators HTML
AD7791 IIO Low Power Sigma-Delta ADC Linux Driver Device Drivers HTML
BeMicro FPGA Project for CN0271 with Nios driver FPGA HDL HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Price, packaging, availability

AD7790 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7790BRM Status: Production 10 ld MSOP 10 Ind Tube, 50 $4.06 $3.45 N  Material Info PCN Purchase
AD7790BRM-REEL Status: Contact ADI 10 ld MSOP 10 Ind Reel, 3000 - - N  Material Info PCN/PDN Contact ADI
AD7790BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $3.51 $2.99 Y  Material Info PCN Purchase Sample
AD7790BRMZ-REEL Status: Production 10 ld MSOP 10 Ind Reel, 3000 - $2.99 Y  Material Info PCN Purchase
Price Table Help

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.


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