AD7686

500 kSPS 16-BIT PulSAR® A/D Converter in MSOP/QFN
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Product Details

The AD7686 is a 16-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, the AD7686 samples an analog input IN+ between 0 V to REF with respect to a ground sense IN−. The reference voltage, REF, is applied externally and can be set up to the supply voltage.

Power dissipation scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus or provides an optional busy indicator. This device is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.

The AD7686 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.

Applications

  • Battery-powered equipment
  • Data acquisitions
  • Instrumentation
  • Medical instruments
  • Process controls

Product Lifecycle

checked 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

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EVAL-AD7686 Circuit Diagram

Product Details

The EVAL-AD7686SDZ is a fully featured evaluation kit for the AD7686. This board operates in stand alone mode or in conjunction with the System Development Platform, EVAL-SDP-CB1Z . When operated with the System Development Platform software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the System Development Platform . When operated in standalone mode the ADZS-BRKOUT-EX3 break out board is recommended for access to various control pins.

Documentation

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Tools & Simulations

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IBIS Models

Product Recommendations

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AD7686 Companion Parts

Recommended Digital Isolators

  • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation , we recommend the ADUM3401 .
  • For SPI Interface, lowest power, 2.5 kVrms isolation , we recommend the ADUM1401 .
  • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V) , we recommend the ADUM3481 .
  • For SPI Interface, low power, 5.0 kVrms isolation , we recommend the ADUM4401 .

Recommended Driver Amplifiers

Recommended External Voltage References

  • For other voltage references , we recommend the ADR430 .
  • For best performance , we recommend the ADR435 or the ADR4550 .

Reference Materials

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Design Resources

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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.

AD7686 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Reviews

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Overview

2 Reviews
2 out of 2 (100%) customers recommend this product.
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Most Helpful Review

by techfreakz
Although this part is fairly expensive, it makes a great part for instrumentation applications. I use this part in a USB wideband RF power meter application with a fully differential signal chain and programmable gain (using the AD8237 In-Amp and switchable resistors as per the app note). This part appears to be stable over time and temperaturesuch that I can make accurate measurements with hundredths of a dB repeatability.

Most Recent Review

by LR
We used the AD7686 on a mixed signal IQ demodulator to digitalize an intermediary frequency at around 10 kHz. The ADC performed well at the first attempt and was really easy to use.

All Reviews

by LR, 12 Aug 13
Good base-band ADC
We used the AD7686 on a mixed signal IQ demodulator to digitalize an intermediary frequency at around 10 kHz. The ADC performed well at the first attempt and was really easy to use.
Was this Helpful?Helpful(0)
by techfreakz, 9 Jul 13
A great ADC for instrumentation
Although this part is fairly expensive, it makes a great part for instrumentation applications. I use this part in a USB wideband RF power meter application with a fully differential signal chain and programmable gain (using the AD8237 In-Amp and switchable resistors as per the app note). This part appears to be stable over time and temperaturesuch that I can make accurate measurements with hundredths of a dB repeatability.
Was this Helpful?Helpful(0)

Sample & Buy

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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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Evaluation Boards Pricing displayed is based on 1-piece.
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.