Datasheet > AD7891APZ-2

AD7891APZ-2

更新时间： 2024-11-16 18:30:15

品牌	Logo	应用领域
亚德诺 - ADI		PC 转换器
页数	文件大小	规格书
21页	392K
描述
True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition System

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AD7891APZ-2 数据手册

LC²MOS 8-Channel, 12-Bit

High Speed Data Acquisition System

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/

REF IN

REF GND

IN1A

2.5V

REFERENCE

IN1B

STANDBY

IN2A

AD7891

IN2B

IN3A

IN3B

12-BIT

IN4A

ADC

IN4B

IN5A

IN5B

TRACK/HOLD

IN6A

IN6B

DATA/

CONTROL

LINES

APPLICATIONS

Data Acquisition Systems

Motor Control

Mobile Communication Base Stations

Instrumentation

ADDRESS

DECODE

IN7A

IN7B

IN8A

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

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AD7891APZ-2 替代型号

型号	品牌	替代类型	描述	数据表
AD7891APZ-1REEL	ADI	完全替代	True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition
AD7891AP-2	ADI	完全替代	LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System

与AD7891APZ-2相关器件

型号	品牌	获取价格	描述	数据表
AD7891APZ-2REEL	ADI	获取价格	True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition
AD7891AS-1	ADI	获取价格	LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System
AD7891AS-2	ADI	获取价格	LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System
AD7891AS-2Z	ADI	获取价格	IC 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PQFP44, PLASTIC, MO-112-AA-
AD7891ASZ-1	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PQFP44, LEAD FREE, PLASTIC, MO
AD7891ASZ-1	ADI	获取价格	True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition
AD7891ASZ-12	ADI	获取价格	LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System
AD7891ASZ-1REEL	ADI	获取价格	True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition
AD7891ASZ-2	ADI	获取价格	8-Channel, 12-Bit High Speed Data Acquisition System
AD7891ASZ-22	ADI	获取价格	LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System

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