Image AD7656
型号: AD7656
厂商: Analog Devices Inc Analog Devices Inc
标准:
分类: 半导体
描述: 250 ksps, 6-channel,simultaneous sampling, bipolar 12/14/16-bit adc
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250 kSPS, 6-Channel,Simultaneous  
Sampling, Bipolar 12/14/16-Bit ADC  
Preliminary Technical Data  
AD7658/AD7657/AD7656*  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
6 Independent ADCs  
AV  
DV  
CC  
CC  
CONVSTB  
V
CONVSTC  
CONVSTA  
DD  
True Bipolar Analog Inputs  
Pin/Software Selectable Ranges:- ±10ꢀ, ±±ꢀ  
Fast throughput rate: 2±0 kSPS  
Specified for ꢀCC of 4.± ꢀ to ±.± ꢀ  
Low power  
CS  
CLK  
OSC  
SER/PAR  
CONTROL  
LOGIC  
V
DRIVE  
REF  
STBY  
BUF  
OUTPUT  
DRIVERS  
D
OUT  
A
16-BIT SAR  
V
V
T/H  
T/H  
1
160mW at 2±0 kSPS with ± ꢀ supplies  
Wide input bandwidth:  
SCLK  
16-BIT SAR  
16-BIT SAR  
16-BIT SAR  
16-BIT SAR  
16-BIT SAR  
2
3
8± dB SNR at ±0 kHz input frequency  
On-chip Reference and Reference Buffers  
Parallel and Serial Interface  
High speed serial interface  
SPI/QSPI/µWire/DSP compatible  
Standby mode: ± µA max  
OUTPUT  
DRIVERS  
D
OUT  
B
BUF  
V
T/H  
T/H  
T/H  
OUTPUT  
DRIVERS  
D
OUT  
C
V
V
4
DATA/  
CONTROL  
LINES  
OUTPUT  
DRIVERS  
BUF  
5
RD  
iCMOSTM Process Technology  
64 LQFP package  
WR  
V
T/H  
V
6
AD7656  
AGND  
SS  
DGND  
APPLICATIONS  
Figure 1.  
Power Line Monitoring systems  
Instrumentation and control systems  
Multi-axis positioning systems  
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.  
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.  
PRODUCT HIGHLIGHTS  
1. Six 12/14/16-bit 250 kSPS ADCs on board.  
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  
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.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Specifications subject to change without notice. No license is granted by implication  
Tel: 781.329.4700  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  
or otherwise under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective owners.