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AD7656:  250 kSPS, 6-Channel, Simultaneous Sampling Bipolar 16-Bit ADC

Product Details


Please Visit Next Generation Product AD7606

The AD7656/AD7657/AD7658 contain six 16-/14-/12-bit, fast, low power, successive approximation 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 parts 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 AD7656/AD7657/AD7658 feature throughput rates up to 250 kSPS. The parts contain low noise, wide bandwidth, track-and-hold amplifiers that can handle input frequencies up to 12 MHz.

The conversion process and data acquisition are controlled using CONVST signals and an internal oscillator. Three CONVST pins allow independent, simultaneous sampling of the three ADC pairs. The AD7656/AD7657/AD7658 all have a high speed parallel and serial interface, allowing the devices to interface with microprocessors or DSPs. In serial interface mode, the parts have a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656/ AD7657/AD7658 can accommodate true bipolar input signals in the ±4 × VREF range and ±2 × VREF range. The AD7656/ AD7657/AD7658 also contain an on-chip 2.5 V reference.

Please visit next generation product AD7606. Recommended for new designs is the AD7656A pin for pin compatible device with improved PSS robustness. For reduced decoupling requirements visit the AD7656-1 or AD7656A-1 product page.

Product Highlights

  1. Six 16-/14-/12-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 ADCs
  • True bipolar analog inputs
  • Pin-/software-selectable ranges: ±10 V, ±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 SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
  • Standby mode: 100 µW maximum
  • 64-lead LQFP

Functional Block Diagram for AD7656

Documentation

Title Content Type File Type
AD7656/AD7657/AD7658: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16/14/12-Bit ADC Data Sheet (Rev D, 03/2012) (pdf, 765 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
Leading Inside Advertorials: A Whole New Value Equation for Industrial Designs  (pdf, 157 kB) Overview 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
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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

Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD7656

  • For 16-bit ADC drivers requiring high speed and low noise, we recommend the AD8021 or the ADA4899-1.
  • For 16 bit applications requiring ultra low noise, low distortion, we recommend the AD8597 or the dual AD8599.
  • For 16 bit applications driving large capacitive loads, we suggest the AD8610 or ADA4627-1.
Recommended High Accuracy, Precision References - 2.5V for the AD7656
  • For applications requiring the lowest noise performance and output trim adjust, we recommend the ADR441.
  • For high accuracy, low noise, low temperature drift, we recommend the ADR421 or the ADR431.
  • For wide supply applications, we recommend the AD780.
  • For cost sensitive applications, we suggest the AD1582 or the ADR391.
Recommended Voltage Regulators for the AD7656
  • For low dropout regulators with inputs up to 5V, we recommend the low noise ADP151 or the low power ADP160.
  • For high current switching regulators with inputs up to 5V, we recommend the low noise ADP2114.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7656 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7656BSTZ Status: Production 64 ld LQFP (10x10mm) 64 Ind Tray, 160 $14.69 $12.45 Y  Material Info PCN Purchase Sample
AD7656BSTZ-REEL Status: Production 64 ld LQFP (10x10mm) 64 Ind Reel, 1500 - $12.45 Y  Material Info PCN Purchase
AD7656YSTZ Status: Production 64 ld LQFP (10x10mm) 64 Ind Tray, 160 $15.22 $12.90 Y  Material Info PCN Purchase
AD7656YSTZ-REEL Status: Last Time Buy 64 ld LQFP (10x10mm) 64 Ind Reel, 1500 - $12.90 Y  Material Info PCN/PDN 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.

AD7656 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7656SDZ Status: Production Evaluation Board - Yes -
EVAL-SDP-CB1Z Status: Production Eval controller board $99.00 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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