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AD7789:  24-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter

Product Details


The AD7788/AD7789 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. The AD7789 contains a 24-bit S-D ADC with one differential input, which is unbuffered. The AD7788 is a 16-bit version of the AD7789. The AD7788 has a peak-to-peak resolution of 16 bits while the AD7789 has a peak to peak resolution of 19 bits, which is equivalent to an effective resolution of 21.5 bits.

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 is 16.6 Hz which gives simultaneous 50 Hz/60 Hz rejection. Power supply monitoring can also be performed with the part.

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 AD7788/AD7789 is housed in a 10-lead MSOP package.

FEATURES and BENEFITS

  • 24-bit resolution
  • Power
    - Supply: 2.5 V to 5.25 V operation
    - Normal: 75 µA maximum
    - Power-down: 1 µA maximum
  • RMS noise: 1.5 µV
  • 19-bit p-p resolution (21.5 bits effective)
  • Integral nonlinearity: 3.5 ppm typical
  • Simultaneous 50 Hz and 60 Hz rejection
  • Internal clock oscillator
  • VDD monitor channel
  • 10-lead MSOP

Functional Block Diagram for AD7789

Documentation

Title Content Type File Type
AD7788/AD7789: Low Power, 16-/24-Bit, Sigma-Delta ADCs Data Sheet  (Rev B, 03/2006) (pdf, 375 kB) 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
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
RAQs index Rarely Asked Questions 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
AD7791 IIO Low Power Sigma-Delta ADC Linux Driver Device Drivers 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.

SampleSample & Buy

Price, packaging, availability

AD7789 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7789BRM Status: Production 10 ld MSOP 10 Ind Tube, 50 $4.06 $3.45 N  Material Info PCN Purchase
AD7789BRM-REEL Status: Last Time Buy 10 ld MSOP 10 Ind Reel, 3000 - $3.45 N  Material Info PCN/PDN Purchase
AD7789BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $3.51 $2.99 Y  Material Info PCN Purchase Sample
AD7789BRMZ-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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