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AD7656A Datasheet(PDF) 1 Page - Analog Devices

Part # AD7656A
Description  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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250 kSPS, 6-Channel, Simultaneous
Sampling, Bipolar 16-Bit ADC
Data Sheet
AD7656A
FEATURES
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
i
CMOS® 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
APPLICATIONS
Power line monitoring systems
Instrumentation and control systems
Multi-axis positioning systems
FUNCTIONAL BLOCK DIAGRAM
VSS
DGND
VDD
REF
CONVST A
CONVST B CONVST C
OUTPUT
DRIVERS
OUTPUT
DRIVERS
OUTPUT
DRIVERS
OUTPUT
DRIVERS
CONTROL
LOGIC
BUF
BUF
BUF
AGND
T/H
T/H
T/H
T/H
T/H
T/H
CLK
OSC
AVCC
DVCC
V1
V2
V3
V4
V5
V6
SER/PAR/SEL
CS
VDRIVE
STBY
DB8/DOUT A
DB9/DOUT B
DB10/DOUT C
SCLK
RD
WR/REFEN/DIS
DATA/
CONTROL
LINES
AD7656A
16-BIT SAR
16-BIT SAR
16-BIT SAR
16-BIT SAR
16-BIT SAR
16-BIT SAR
Figure 1.
GENERAL DESCRIPTION
The AD7656A1 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.
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.
1
Protected by U.S. Patent No. 6,731,232.
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


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