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Analog Devices - (AD7656 - AD7658) Bipolar 12/14/16-Bit ADC

Numéro de référence AD7656
Description (AD7656 - AD7658) Bipolar 12/14/16-Bit ADC
Fabricant Analog Devices 
Logo Analog Devices 





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Preliminary Technical Data
250 kSPS, 6-Channel,Simultaneous
Sampling, Bipolar 12/14/16-Bit ADC
AD7658/AD7657/AD7656*
FEATURES
6 Independent ADCs
True Bipolar Analog Inputs
Pin/Software Selectable Ranges:- ±10V, ±5V
Fast throughput rate: 250 kSPS
Specified for VCC of 4.5 V to 5.5 V
Low power
160mW at 250 kSPS with 5 V supplies
Wide input bandwidth:
85 dB SNR at 50 kHz input frequency
On-chip Reference and Reference Buffers
Parallel and Serial Interface
High speed serial interface
SPI/QSPI/µWire/DSP compatible
Standby mode: 5 µA max
iCMOSTM Process Technology
64 LQFP package
APPLICATIONS
Power Line Monitoring systems
Instrumentation and control systems
Multi-axis positioning systems
FUNCTIONAL BLOCK DIAGRAM
VDD
CONVSTA CONVSTB CONVSTC
AVCC DVCC
REF
BUF
CLK
OSC
V1 T/H
16-BIT SAR
V2 T/H
V3 T/H
BUF
16-BIT SAR
16-BIT SAR
V4 T/H
V5 T/H
BUF
16-BIT SAR
16-BIT SAR
V6 T/H
VSS
16-BIT SAR
CONTROL
LOGIC
OUTPUT
DRIVERS
+5
SER/PAR
VDRIVE
STBY
DOUTA
SCLK
OUTPUT
DRIVERS
OUTPUT
DRIVERS
DOUTB
DOUTC
OUTPUT
DRIVERS
DATA/
CONTROL
LINES
4,
94
AD7656
AGND
DGND
Figure 1.
GENERAL DESCRIPTION
The AD7658/AD7657/AD7656 contain six 12/14/16-bit, fast, low
power, successive approximation ADCs all in the one package.
The AD7658/AD7657/AD7656 core operates from a single 4.5
V to 5.5 V power supply and features throughput rates up to 250
kSPS. The parts contain low noise, wide bandwidth track-and-
hold amplifiers that can handle input frequencies up to 8 MHz.
signals in the ±10V range and ±5V range . They contain a 2.5V
internal reference and can also accept an external reference. If a
3V external reference is applied to the VREF pin, the ADCs can
accommodate a true bipolar ±12V analog input range. VDD and
VSS supplies of ±12V are required for this ±12V input range.
PRODUCT HIGHLIGHTS
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 AD7658/AD7657/AD7656 have both a
high speed parallel and serial interface allowing the devices to
interface with microprocessors or DSPs. When in Serial
interface mode these parts have a Daisy Chain feature allowing
multiple ADCs to connect to a single serial interface. The
AD7658/AD7657/AD7656 can accommodate true bipolar input
1. Six 12/14/16-bit 250 kSPS ADCs on board.
2. Six true bipolar high impedance analog inputs.
3. The AD7658/AD7657/AD7656 feature both a parallel and
a high speed serial interface.
* Protected by U.S. Patent No. 6,731,232
iCMOSTM Process Technology
For analog systems designers within industrial/instrumentation equipment OEMs who need high performance ICs at higher-voltage levels, iCMOS is a technology platform
that enables the development of analog ICs capable of 30V and operating at +/- 15V supplies while allowing dramatic reductions in power consumption and package size, and
increased AC and DC performance.
Rev. PrI
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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