AD7656A-1:  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar, 16-Bit ADC

Product Details

Product Status:Recommended for New Designs

The AD7656A-1 is a reduced decoupling pin- and software-compatible version of AD7656A. The AD7656A-1 contains six 16-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 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-1 features throughput rates of to 250 kSPS. It contains wide bandwidth (4.5 MHz), 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 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-1 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-1 has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656A-1 can accommodate true bipolar input signals in the ±4 × VREF range and the ±2 × VREF range. The AD7656A-1 also contains an on-chip 2.5 V reference.

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

PRODUCT HIGHLIGHTS

  1. Six 16-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 AD7656A.

APPLICATIONS

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

FEATURES and BENEFITS

  • Pin and software compatible with the AD7656A featuring reduced decoupling requirements
  • 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
  • High noise performance with wide bandwidth
    88 dB SNR at 10 kHz input frequency
  • On-chip reference and reference buffers
  • See data sheet for additional features

Functional Block Diagram for AD7656A-1

Documentation

Title Content Type File Type
AD7656A-1: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar, 16-Bit ADC Data Sheet (Rev 0, 01/2014) (pdf, 617 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
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.

SampleSample & Buy

Price, packaging, availability

AD7656A-1 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7656A-1BSTZ Status: Production 64 ld LQFP (10x10mm) 64 Ind Tray, 160 $14.69 $12.45 Y  Material Info Notify Me Purchase Sample
AD7656A-1BSTZ-RL Status: Production 64 ld LQFP (10x10mm) 64 Ind Reel, 1500 - $12.45 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.

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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