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

AD7656-1 Data Sheet Rev D, 03/2012 (pdf 861kB)

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Product Details

Check Price and Availability Add to Signal Chain Designer Explore in Signal Chain Designer

Model	Package	Price* (100-499)	Price* 1000 pcs
AD7656BSTZ-1 Status: Production	64 ld LQFP (10x10mm)	$14.69	$12.45
AD7656BSTZ-1-RL Status: Production	64 ld LQFP (10x10mm)	-	$12.45
AD7656YSTZ-1 Status: Production	64 ld LQFP (10x10mm)	$15.22	$12.90
AD7656YSTZ-1-RL Status: Production	64 ld LQFP (10x10mm)	-	$12.90

NEW DESIGNS consider the AD7606.

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 × V_REF and ±2 × V_REF ranges. Each AD7656-1/AD7657-1/ AD7658-1 also contains an on-chip 2.5 V reference.

Product Highlights

Six 16-/14-/12-bit, 250 kSPS ADCs on board.
Six true bipolar, high impedance analog inputs.
High speed parallel and serial interfaces.
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

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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

Typical Applications and Other Diagrams

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Similar Products

NEW DESIGNS consider the AD7606.

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
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.

Sample & Buy

Price, packaging, availability

AD7656-1 Model Options

Print Table

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

Print Table

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