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AD7656-1:  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC

Product Details


Newer Alternatives:
  • AD7606 8-Channel DAS with 16-Bit, Bipolar, Simultaneous Sampling ADC

The AD7656-1/AD7657-1/AD7658-1 are reduced decoupling pin- and software-compatible versions of AD7656/AD7657/AD7658. The AD7656-1/AD7657-1/AD7658-1 devices contain six 16-/ 14-/12-bit, fast, low power successive approximation ADCs in a package 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 conven-tional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, which dramatically reduces power consumption and package size.

The AD7656-1/AD7657-1/AD7658-1 feature throughput rates of up to 250 kSPS. The parts contain low noise, wide bandwidth track-and-hold amplifiers that can handle input frequencies up to 4.5 MHz.

The conversion process and data acquisition are controlled using the CONVST signals and an internal oscillator. Three CONVST pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656-1/AD7657-1/AD7658-1 have a high speed parallel and serial interface, allowing the devices to interface with microprocessors or DSPs. When the serial interface is selected, each part has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656-1/AD7657-1/ AD7658-1 can accommodate true bipolar input signals in the ±4 × VREF and ±2 × VREF ranges. Each AD7656-1/AD7657-1/ AD7658-1 also contains an on-chip 2.5 V reference.

Product Highlights

  1. Six 16-/14-/12-bit, 250 kSPS ADCs on board.
  2. Six true bipolar, high impedance analog inputs.
  3. High speed parallel and serial interfaces.
  4. Reduced decoupling requirements and reduced bill of materials cost compared with the AD7656/AD7657/ AD7658 devices.

Applications

  • Power line monitoring and measuring systems
  • Instrumentation and control systems
  • Multiaxis positioning systems

FEATURES and BENEFITS

  • Chinese data sheet available
  • Pin and software compatible with AD7656/AD7657/AD7658 featuring reduced decoupling requirements
  • 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
  • See Data Sheet for Additional Information

Functional Block Diagram for AD7656-1

Similar Products

  • AD7606 8-Channel DAS with 16-Bit, Bipolar, Simultaneous Sampling ADC

Documentation

Title Content Type File Type
AD7656-1/AD7657-1/AD7658-1: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar, 16-/14-/12-Bit ADC Data Sheet (Rev D, 03/2012) (pdf, 861 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-417: Evaluating the AD7656-1/AD7657-1/AD7658-1, 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-/14-/12-Bit ADCs  (pdf, 1618 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
BeMicro FPGA Project for AD7656-1 with Nios driver FPGA HDL HTML
AD7656-1 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design Device Drivers 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 AD7656-1

  • For 16-bit ADC drivers requiring high speed and low noise, we recommend the AD8021, ADA4899-1 or the dual AD8022.
  • 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 the ADA4627-1.
Recommended High Accuracy, Precision References - 2.5V for the AD7656-1
  • 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 AD7656-1
  • 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

AD7656-1 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7656BSTZ-1 Status: Production 64 ld LQFP (10x10mm) 64 Ind Tray, 160 $14.69 $12.45 Y  Material Info PCN Purchase Sample
AD7656BSTZ-1-RL Status: Production 64 ld LQFP (10x10mm) 64 Ind Reel, 1500 - $12.45 Y  Material Info PCN Purchase
AD7656YSTZ-1 Status: Production 64 ld LQFP (10x10mm) 64 Ind Tray, 160 $15.22 $12.90 Y  Material Info PCN Purchase Sample
AD7656YSTZ-1-RL Status: Production 64 ld LQFP (10x10mm) 64 Ind Reel, 1500 - $12.90 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.

AD7656-1 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7656-1SDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation 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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