AD7656A:  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC

Product Details

Product Status:Recommended for New Designs

The AD7656A contains six 16-bit, fast, low power, successive approximation analog-to-digital converters (ADCs) all in the one package that is designed on the iCMOS® process (industrial CMOS). iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs, capable of 33 V operation in a footprint that no previous generation of high voltage devices could achieve. Unlike analog ICs using conventional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, which dramatically reduces power consumption and package size.

The AD7656A features throughput rates of up to 250 kSPS. It contains wide bandwidth (12 MHz), track-and-hold amplifiers that can handle input frequencies up to 12 MHz.

The conversion process and data acquisition are controlled using CONVST x signals and an internal oscillator. Three CONVST x pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656A has a high speed parallel and serial interface, allowing the device to interface with microprocessors or digital signal processors (DSPs). In serial interface mode, the AD7656A has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656A can accommodate true bipolar input signals in the ±4 × VREF range and ±2 × VREF range. The AD7656A also contains an on-chip 2.5 V reference.

Multifunction pin names may be referenced by their relevant function only.

Please visit next generation product AD7606. For reduced decoupling requirements visit the AD7656A-1 product page.

PRODUCT HIGHLIGHTS

  1. Six 16-bit, 250 kSPS ADCs on board.
  2. Six true bipolar, high impedance analog inputs.
  3. Parallel and high speed serial interfaces.

APPLICATIONS

  • Power line monitoring systems
  • Instrumentation and control systems
  • Multi-axis positioning systems

FEATURES and BENEFITS

  • 6 independent analog-to-digital converters (ADCs)
  • True bipolar analog inputs
  • Pin-/software-selectable ranges: ±10 V or ±5 V
  • Fast throughput rate: 250 kSPS
  • iCMOS® process technology
  • Low power: 140 mW at 250 kSPS with 5 V supplies
  • Wide input bandwidth
    86.5 dB SNR at 50 kHz input frequency
  • On-chip reference and reference buffers
  • Parallel, serial, and daisy-chain interface modes
  • High speed serial interface
    Serial peripheral interface (SPI)/QSPI™/MICROWIRE®/DSP compatible
  • Power-down mode:
    100 mW maximum
  • 64-lead LQFP
  • Improved power supply sequencing (PSS) robustness

Functional Block Diagram for AD7656A

Documentation

Title Content Type File Type
AD7656A: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC Data Sheet (Rev 0, 01/2014) (pdf, 491 kB) Data Sheets PDF
AN-931: Understanding PulSAR ADC Support Circuitry  (pdf, 299 kB)
This application note discusses in general the pitfalls that occur regularly when using SAR ADCs and, more importantly, how to easily prevent them.
Application Notes PDF
AN-932: Power Supply Sequencing  (pdf, 95 kB) Application Notes PDF
AN-893: Configuring the AD7656/AD7657/AD7658 for Serial and Daisy-Chain Interface Modes of Operation  (pdf, 133 kB) Application Notes PDF
UG-535: Evaluating the AD7656/AD7657/AD7658, 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-/14-/12-Bit ADCs  (pdf, 1388 kB) User Guides PDF
High-Performance Multichannel Power-Line Monitoring with Simultaneous-Sampling ADCs
By Colm Slattery, Analog Devices, Inc. (Analog Dialogue, Vol. 41, January 2007)
Analog Dialogue HTML
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Converters for Motor Control  (pdf, 929 kB)
Higher performance, greater accuracy and speed, and ultralow power consumption highlight Analog Devices’ portfolio of data converters for motor control. Each delivers optimum quality signals to/from the real world and processes the data with less development time, fewer parts, and lower costs.
Overview PDF
High Speed, High Accuracy 14-Bit, 16-Bit, and 18-Bit PulSAR ADCs  (pdf, 3826 kB)
A PulSAR Family Brochure (6/2006)
Overview PDF
Emerging Energy Applications Solutions Bulletin, Volume 10, Issue 4  (pdf, 1496 kB) Solutions Bulletins PDF
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

AD7656A Model Options
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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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EVAL-AD7656SDZ Status: Production Evaluation Board - Yes -

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.

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