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AD7657-1YSTZ

更新时间： 2024-11-21 15:45:35
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亚德诺 - ADI 转换器
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32页 1368K
描述
IC 6-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQFP64, LEAD FREE, MS-026BCD, LQFP-64, Analog to Digital Converter

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AD7657-1YSTZ 数据手册

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250 kSPS, 6-Channel, Simultaneous  
Sampling, Bipolar 16-/14-/12-Bit ADC  
Preliminary Technical Data  
AD7656-1/AD7657-1/AD7658-1  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
AV  
DV  
Six independent ADCs  
CC  
CC  
CONVSTB  
V
CONVSTC  
CONVSTA  
DD  
True bipolar analog inputs  
CS  
SER/PAR  
Pin-/software-selectable ranges: ±10 V, ±± V  
Fast throughput rate: 2±0 kSPS  
iCMOSTM process technology  
Low power  
TBD mW at 2±0 kSPS with ± V supplies  
Wide input bandwidth  
TBD dB SNR at ±0 kHz input frequency  
On-chip reference and reference buffers  
Parallel, serial, and daisy-chain interface modes  
High speed serial interface  
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible  
Standby mode: 100 µW max  
CLK  
OSC  
CONTROL  
LOGIC  
V
DRIVE  
STBY  
REF  
BUF  
OUTPUT  
DRIVERS  
D
OUT  
A
V
V
T/H  
T/H  
16/14/12-BIT SAR  
16/14/12-BIT SAR  
1
SCLK  
2
3
OUTPUT  
DRIVERS  
D
OUT  
B
BUF  
V
T/H  
T/H  
16/14/12-BIT SAR  
16/14/12-BIT SAR  
OUTPUT  
DRIVERS  
D
OUT  
C
V
4
DATA/  
CONTROL  
LINES  
OUTPUT  
DRIVERS  
BUF  
64-lead LQFP  
16/14/12-BIT SAR  
V
V
T/H  
5
RD  
WR  
APPLICATIONS  
16/14/12-BIT SAR  
T/H  
V
6
Power line monitoring systems  
Instrumentation and control systems  
Multi-axis positioning systems  
AD7656-1/AD7657-1/AD7658-1  
AGND  
SS  
DGND  
Figure 1.  
GENERAL DESCRIPTION  
CONVST pins allow independent, simultaneous sampling of  
the three ADC pairs. The AD7656-1/AD7657-1/AD7658-1 all  
have a high speed parallel and serial interface, allowing the  
devices to interface with microprocessors or DSPs. In serial  
interface mode, the parts have 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 × VREF range and 2 × VREF range.  
The AD7656-1/ AD7657-1/AD7658-1 also contain an on-chip  
2.5 V reference.  
The AD7656-1/AD7657-1/AD7658-11 contain six 16-/14-/12-  
bit, fast, low power, successive approximation 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 parts  
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.  
PRODUCT HIGHLIGHTS  
1. Six 16-/14-/12-bit, 250 kSPS ADCs on board.  
2. Six true bipolar, high impedance analog inputs.  
3. Parallel and high speed serial interfaces.  
The AD7656-1/AD7657-1/AD7658-1 feature throughput rates  
up to 250 kSPS. The parts contain low noise, wide bandwidth,  
track-and-hold amplifiers that can handle input frequencies  
up to 12 MHz.  
The conversion process and data acquisition are controlled  
using CONVST signals and an internal oscillator. Three  
1 Protected by U.S. Patent No. 6,731,232.  
Rev. PrC  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2007 Analog Devices, Inc. All rights reserved.  
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