AD7884ABP データシートの表示（PDF） - Analog Devices

部品番号

コンポーネント説明

一致するリスト

AD7884ABP

LC2MOS 16-Bit, High-Speed Sampling ADCs

Analog Devices 

a

LC2MOS

16-Bit, High-Speed Sampling ADCs

AD7884/AD7885

FEATURES

Monolithic Construction

Fast Conversion: 5.3 ␮s

High Throughput: 166 kSPS

Low Power: 250 mW

APPLICATIONS

Automatic Test Equipment

Medical Instrumentation

Industrial Control

Data Acquisition Systems

Robotics

GENERAL DESCRIPTION

The AD7884/AD7885 is a 16-bit monolithic analog-to-digital

converter with internal sample-and-hold and a conversion time

of 5.3 µs. The maximum throughput rate is 166 kSPS. It uses a

two-pass flash architecture to achieve this speed. Two input

ranges are available: ± 5 V and ± 3 V. Conversion is initiated by

the CONVST signal. The result can be read into a microprocessor

using the CS and RD inputs on the device. The AD7884 has a

16-bit parallel reading structure while the AD7885 has a byte reading

structure. The conversion result is in two’s complement code.

The AD7884/AD7885 has its own internal oscillator which controls

conversion. It runs from ±5 V supplies and needs a VREF+ of 3 V.

The AD7884 is available in a 40-lead Cerdip package and in a

44-lead PLCC package.

The AD7885 is available in a 28-lead Cerdip package and the AD7885A

is available in a 44-lead PLCC package.

FUNCTIONAL BLOCK DIAGRAMS

؎3VINF ؎3VINS

AGNDS AGNDF AVDD AVSS VDD VSS

؎5VINS

؎5VINF

R2

3k⍀

R1

5k⍀

R3

3k⍀ C1

SW1 A1

AD7884

R6

2k⍀

R4

4k⍀

SW2

R5

4k⍀

VREF–

A2

SW3

9-BIT

ADC

16-BIT

ACCURATE

DAC

9

TIMER

R7

2k⍀

9

9

LATCH

+ 16

ALU

O

U

T

P

U

T

D

R

I

V

E

R

S

16

DB15

DB0

CONTROL

CS

RD

R8

2k⍀

VREF+F VREF+S VINV VREF– GND CONVST BUSY DGND

؎3VIN

AGNDS AGNDF AVDD AVSS VDD VSS

؎5VINS

؎5VINF

R2

3k⍀

R1

5k⍀

R3

3k⍀ C1

SW1 A1

AD7885

R6

2k⍀

R4

4k⍀

SW2

R5

4k⍀

VREF–

A2

SW3

9-BIT

ADC

16-BIT

ACCURATE

DAC

9

TIMER

R7

2k⍀

9

9

LATCH

+ 16

ALU

O

U

T

P

U

T

D

R

I

V

E

R

S

8

DB7

DB0

CONTROL

CS

RD

R8

2k⍀

VREF+F VREF+S VINV VREF– GND CONVST BUSY DGND

HBEN

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, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700S

www.analog.com

Fax: 781/326-8703S

© Analog Devices, Inc., 2002

Share Link: