Datasheet > AD7720

AD7720

更新时间： 2024-11-06 22:49:59

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	235K
描述
CMOS Sigma-Delta Modulator

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数据手册

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AD7720 数据手册

CMOS Sigma-Delta Modulator

AD7720

FUNCTIO NAL BLO CK D IAGRAM

FEATURES

12.5 MHz Master Clock Frequency

0 V to +2.5 V or ؎1.25 V Input Range

Single Bit Output Stream

90 dB Dynam ic Range

Pow er Supplies: AVDD, DVDD: +5 V ؎ 5%

On-Chip 2.5 V Voltage Reference

28-Lead TSSOP

AVDD

AGND

DVDD

DGND

REF1

AD7720

2.5V

REFERENCE

REF2

VIN(+)

VIN(–)

DATA

SCLK

SIGMA-DELTA

MODULATOR

MZERO

XTAL1/MCLK

XTAL2

CLOCK

CIRCUITRY

DVAL

CONTROL

LOGIC

BIP

RESETO

RESET

STBY

GENERAL D ESCRIP TIO N

T his device is a 7th order sigma-delta modulator that converts

the analog input signal into a high speed 1-bit data stream. T he

part operates from a +5 V supply and accepts a differential input

range of 0 V to +2.5 V or ±1.25 V centered about a common-

mode bias. T he analog input is continuously sampled by the

analog modulator, eliminating the need for external sample and

hold circuitry. T he input information is contained in the output

stream as a density of ones. T he original information can be

reconstructed with an appropriate digital filter.

T he part provides an accurate on-chip 2.5 V reference. A refer-

ence input/output function is provided to allow either the inter-

nal reference or an external system reference to be used as the

reference source for the part.

T he device is offered in a 28-lead T SSOP package and designed

to operate from –40°C to +85°C.

REV. 0

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: 781/ 329-4700

Fax: 781/ 326-8703

World Wide Web Site: http:/ / w w w .analog.com

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