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AD7891ACHIPS-1 PDF预览

AD7891ACHIPS-1

更新时间： 2024-11-19 12:33:15
品牌 Logo 应用领域
亚德诺 - ADI 转换器模数转换器
页数 文件大小 规格书
20页 1117K
描述
LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System

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AD7891ACHIPS-1 数据手册

 浏览型号AD7891ACHIPS-1的Datasheet PDF文件第2页浏览型号AD7891ACHIPS-1的Datasheet PDF文件第3页浏览型号AD7891ACHIPS-1的Datasheet PDF文件第4页浏览型号AD7891ACHIPS-1的Datasheet PDF文件第5页浏览型号AD7891ACHIPS-1的Datasheet PDF文件第6页浏览型号AD7891ACHIPS-1的Datasheet PDF文件第7页 
LC2MOS 8-Channel, 12-Bit  
High Speed Data Acquisition System  
a
AD7891  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Fast 12-Bit ADC with 1.6 ␮s Conversion Time  
8 Single-Ended Analog Input Channels  
Overvoltage Protection on Each Channel  
Selection of Input Ranges:  
؎5 V, ؎10 V for AD7891-1  
0 to +2.5 V, 0 to +5 V, ؎2.5 V for AD7891-2  
Parallel and Serial Interface  
On-Chip Track/Hold Amplifier  
On-Chip Reference  
Single-Supply, Low Power Operation (100 mW Max)  
Power-Down Mode (75 ␮W Typ)  
REF OUT/  
V
V
DD  
REF IN  
REF GND  
DD  
V
IN1A  
2.5V  
REFERENCE  
V
IN1B  
STANDBY  
V
IN2A  
AD7891  
V
IN2B  
V
IN3A  
V
IN3B  
V
12-BIT  
IN4A  
M
U
X
ADC  
V
IN4B  
V
IN5A  
V
IN5B  
TRACK/HOLD  
V
IN6A  
V
IN6B  
DATA/  
CONTROL  
LINES  
APPLICATIONS  
Data Acquisition Systems  
Motor Control  
Mobile Communication Base Stations  
Instrumentation  
V
ADDRESS  
DECODE  
IN7A  
V
IN7B  
V
IN8A  
V
IN8B  
CLOCK  
CONTROL LOGIC  
WR CS RD EOC CONVST MODE  
AGND AGND DGND  
GENERAL DESCRIPTION  
PRODUCT HIGHLIGHTS  
The AD7891 is an 8-channel, 12-bit data acquisition system  
with a choice of either parallel or serial interface structure. The  
part contains an input multiplexer, an on-chip track/hold ampli-  
fier, a high speed 12-bit ADC, a 2.5 V reference, and a high  
speed interface. The part operates from a single 5 V supply and  
accepts a variety of analog input ranges across two models, the  
AD7891-1 (±5 V and ±10 V) and the AD7891-2 (0 V to +2.5 V,  
0 V to +5 V, and ±2.5 V).  
1. The AD7891 is a complete monolithic 12-bit data acquisition  
system that combines an 8-channel multiplexer, 12-bit ADC,  
2.5 V reference, and track/hold amplifier on a single chip.  
2. The AD7891-2 features a conversion time of 1.6 ms and an  
acquisition time of 0.4 ms. This allows a sample rate of  
500 kSPS when sampling one channel and 62.5 kSPS when  
channel hopping. These sample rates can be achieved using  
either a software or hardware convert start. The AD7891-1  
has an acquisition time of 0.6 ms when using a hardware  
convert start and an acquisition time of 0.7 ms when using a  
software convert start. These acquisition times allow sample  
rates of 454.5 kSPS and 435 kSPS, respectively, for hardware  
and software convert start.  
The AD7891 provides the option of either a parallel or serial  
interface structure determined by the MODE pin. The part  
has standard control inputs and fast data access times for both  
the serial and parallel interfaces, ensuring easy interfacing to  
modern microprocessors, microcontrollers, and digital signal  
processors.  
3. Each channel on the AD7891 has overvoltage protection. This  
means an overvoltage on an unselected channel does not affect  
the conversion on a selected channel. The AD7891-1 can  
withstand overvoltages of ±17 V.  
In addition to the traditional dc accuracy specifications, such as  
linearity, full-scale and offset errors, the part is also specified for  
dynamic performance parameters, including harmonic distortion  
and signal-to-noise ratio.  
Power dissipation in normal mode is 82 mW typical; in  
the standby mode, this is reduced to 75 mW typ. The part is  
available in a 44-terminal MQFP and a 44-lead PLCC.  
REV. D  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. 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  
Fax: 781/326-8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  
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