AD7724

更新时间： 2024-11-08 22:49:59

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
14页	535K
描述
Dual CMOS Modulators

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中文翻译

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数据手册

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AD7724 数据手册

Dual CMOS ⌺-⌬ Modulators

AD7724

FUNCTIONAL BLOCK DIAGRAM

FEATURES

13 MHz Master Clock Frequency

0 V to +2.5 V or ؎1.25 V Input Range

Single Bit Output Stream

90 dB Dynamic Range

REF1 REF2A

REF2B

2.5V

REFERENCE

Power Supplies

AD7724

AVDD, DVDD: 5 V ؎ 5%

DVDD1: 3 V ؎ 5%

Logic Outputs 3 V/5 V Compatible

On-Chip 2.5 V Voltage Reference

48-Lead LQFP

AVIN(+)

AVIN(–)

⌺-⌬

ADATA

SCLK

MODULATOR A

BVIN(+)

BVIN(–)

⌺-⌬

MODULATOR B

BDATA

XTAL OFF

XTAL1

CLOCK

CIRCUITRY

MZERO

XTAL2/MCLK

CONTROL

LOGIC

BIP

DVAL

GENERAL DESCRIPTION

STBY

RESET

This device consists of two seventh order sigma-delta modula-

tors. Each modulator converts its analog input signal into a high

speed 1-bit data stream. The part operates from a 5 V power

supply and accepts a differential input range of 0 V to +2.5 V or

±1.25 V centered about a common-mode bias. The analog inputs

are continuously sampled by the analog modulators, eliminating

the need for external sample-and-hold circuitry. The input infor-

mation is contained in the output stream as a density of ones.

The original information can be digitally reconstructed with an

appropriate digital filter.

DVDD

DVDD1

DGND

AVDD

AGND

The part provides an accurate on-chip 2.5 V reference for each

modulator. A reference input/output function is provided to

allow either the internal reference or an external system refer-

ence to be used as the reference source for the modulator.

The device is offered in a 48-lead LQFP package and designed

to operate from –40°C to +85°C.

REV. A

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

which 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: 781/329-4700

Fax: 781/326-8703

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

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中文翻译

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