AD7890AR-2

更新时间： 2024-09-28 22:07:03

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器光电二极管
页数	文件大小	规格书
20页	304K
描述
LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

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数据手册
替代型号

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AD7890AR-2 数据手册

LC MOS 8-Channel, 12-Bit

Serial, Data Acquisition System

AD7890

FUNCTIO NAL BLO CK D IAGRAM

FEATURES

Fast 12-Bit ADC w ith 5.9 ␮s Conversion Tim e

Eight Single-Ended Analog Input Channels

Selection of Input Ranges:

؎10 V for AD7890-10

0 V to ؉4.096 V for AD7890-4

0 V to ؉2.5 V for AD7890-2

MUX SHA REF OUT/

V_DD

OUT IN

REF IN

2kΩ

SIGNAL

SCALING*

+2.5V

REFERENCE

V_IN1

V_IN2

SIGNAL

SCALING*

AD7890

Allow s Separate Access to Multiplexer and ADC

On-Chip Track/ Hold Am plifier

On-Chip Reference

High Speed, Flexible, Serial Interface

Single Supply, Low Pow er Operation (50 m W m ax)

Pow er-Dow n Mode (75 ␮W typ)

SIGNAL

V_IN3

V_IN4

V_IN5

V_IN6

V_IN7

V_IN8

SCALING*

C_EXT

SIGNAL

SCALING*

SIGNAL

SCALING*

CONVST

SIGNAL

SCALING*

12-BIT

ADC

SIGNAL

SCALING*

TRACKHOLD

SIGNAL

SCALING*

OUTPUT/CONTROL REGISTER

CLOCK

GENERAL D ESCRIP TIO N

The AD7890 is an eight-channel 12-bit data acquisition system.

The part contains an input multiplexer, an on-chip track/hold

amplifier, a high-speed 12-bit ADC, a +2.5 V reference and a high

speed, serial interface. The part operates from a single +5 V supply

and accepts an analog input range of ±10 V (AD7890-10), 0 V to

+4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2).

AGND AGND

DGND CLK

SCLK

DATA SMODE

TFS

DATA

OUT

RFS

*NO SCALING ON AD7890-2

Power dissipation in normal mode is low at 30 mW typ and the

part can be placed in a standby (power-down) mode if it is not

required to perform conversions. T he AD7890 is fabricated in

Analog Devices’ Linear Compatible CMOS (LC²MOS) process,

a mixed technology process that combines precision bipolar cir-

cuits with low power CMOS logic. T he part is available in a

24-pin, 0.3" wide, plastic or hermetic dual-in-line package or in

a 24-pin small outline package (SOIC).

T he multiplexer on the part is independently accessible. T his

allows the user to insert an antialiasing filter or signal condition-

ing, if required, between the multiplexer and the ADC. T his

means that one antialiasing filter can be used for all eight chan-

nels. Connection of an external capacitor allows the user to

adjust the time given to the multiplexer settling to include any

external delays in the filter or signal conditioning circuitry.

Output data from the AD7890 is provided via a high speed bidi-

rectional serial interface port. T he part contains an on-chip con-

trol register, allowing control of channel selection, conversion

start and power-down via the serial port. Versatile, high speed

logic ensures easy interfacing to serial ports on microcontrollers

and digital signal processors.

P RO D UCT H IGH LIGH TS

1. Complete 12-Bit Data Acquisition System on a Chip

T he AD7890 is a complete monolithic ADC combining an

eight-channel multiplexer, 12-bit ADC, +2.5 V reference and

a track/hold amplifier on a single chip.

2. Separate Access to Multiplexer and ADC

In addition to the traditional dc accuracy specifications such as

linearity, full-scale and offset errors, the AD7890 is also speci-

fied for dynamic performance parameters including harmonic

distortion and signal-to-noise ratio.

T he AD7890 provides access to the output of the multiplexer

allowing one antialiasing filter for eight channels—a consid-

erable saving over the eight antialiasing filters required if the

multiplexer was internally connected to the ADC.

3. High Speed Serial Interface

T he part provides a high speed serial interface for easy

connection to serial ports of microcontrollers and DSP

processors.

REV. A

Inform ation furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assum ed by Analog Devices for its

use, nor for any infringem ents of patents or other rights of third parties

which m ay result from its use. No license is granted by im plication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.

Tel: 617/ 329-4700

Fax: 617/ 326-8703

12 3 4 5 6 7...20

中文翻译

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AD7890AR-2 替代型号

型号	品牌	替代类型	描述	数据表
AD7890ARZ-10	ADI	完全替代	LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
AD7890BR-10	ADI	完全替代	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890AR-10	ADI	完全替代	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

与AD7890AR-2相关器件

型号	品牌	获取价格	描述	数据表
AD7890AR-2REEL	ADI	获取价格	IC 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24, MS-013AD, SOIC-24, Analog to
AD7890AR-4	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890AR-4REEL	ADI	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24, MS-013AD, SOIC-24
AD7890ARZ-10	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
AD7890ARZ-10	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24, LEAD FREE, MS-013AD, SOIC-24
AD7890ARZ-10REEL	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
AD7890ARZ-2	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24, LEAD FREE, MS-013AD, SOIC-24
AD7890ARZ-2	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
AD7890ARZ-2REEL	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890ARZ-4	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24, LEAD FREE, MS-013AD, SOIC-24

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