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AD7787:  Low Power, 2-Channel 24-Bit Sigma-Delta ADC

Product Details


The AD7787 is a low power, complete analog front end for low frequency measurement applications. It contains a low noise 24-bit Σ-Δ ADC with one differential input and one single-ended input that can be buffered or unbuffered.

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 and can be varied from 9.5 Hz to 120 Hz, with the rms noise equal to 1.1 µV at the lower update rate. The internal clock frequency can be divided by a factor of 2, 4, or 8, which leads to a reduction in the current consumption. The update rate, cutoff frequency, and settling time will scale with the clock frequency.

The part operates with a power supply from 2.5 V to 5.25 V. When operating from a 3 V supply, the power dissipation for the part is 225 µW maximum. It is housed in a 10-lead MSOP.

FEATURES and BENEFITS

  • Power
    - Supply: 2.5 V to 5.25 V current
    - Normal: 75 µA max
    - Power-down: 1 µA max
  • 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
  • Interface
    - 3-wire serial
    - SPI®, QSPI™, MICROWIRE™ and DSP compatible
    - Schmitt trigger on SCLK

Functional Block Diagram for AD7787

Documentation

Title Content Type File Type
AD7787: Low Power, 2-Channel 24-Bit Sigma-Delta ADC Data Sheet  (Rev A, 03/2013) (pdf, 326 kB) Data Sheets PDF
AN-968: Current Sources: Options and Circuits  (pdf, 131 kB) Application Notes PDF
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC  (pdf, 222 kB) Application Notes PDF
CN0354: Low Power Multichannel Thermocouple Measurement System with Cold Junction Compensation  (pdf, 238 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
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.

Product Recommendations & Reference Designs

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Price, packaging, availability

AD7787 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7787BRM Status: Production 10 ld MSOP 10 Ind Tube, 50 $5.44 $4.62 N  Material Info PCN Purchase
AD7787BRM-REEL Status: Production 10 ld MSOP 10 Ind Reel, 3000 - $4.62 N  Material Info PCN Purchase
AD7787BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $4.71 $4.00 Y  Material Info PCN Purchase Sample
AD7787BRMZ-RL Status: Production 10 ld MSOP 10 Ind Reel, 3000 - $4.00 Y  Material Info Notify Me 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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