AD7853ARS datasheet(1/34 Pages) AD

Nome de Peças	AD7853ARS

Descrição Electrónicos	3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs

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FUNCTIONAL BLOCK DIAGRAM

2.5V

REFERENCE

CALIBRATION

MEMORY

AND CONTROLLER

SAR + ADC

CONTROL

AVDD

AGND

DVDD

DGND

CLKIN

CONVST

BUSY

SLEEP

CAL

CREF2

CREF1

REFIN/

REFOUT

AIN(–)

AIN(+)

AMODE

SM1

SCLK

SYNC

POLARITY

DOUT

DIN

SM2

AGND

BUF

T/H

COMP

CHARGE

REDISTRIBUTION

DAC

SERIAL INTERFACE / CONTROL REGISTER

AD7853/AD7853L

REV. B

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.

a

3 V to 5 V Single Supply, 200 kSPS

12-Bit Sampling ADCs

AD7853/AD7853L*

FEATURES

Specified for VDD of 3 V to 5.5 V

Read-Only Operation

AD7853–200 kSPS; AD7853L–100 kSPS

System and Self-Calibration with Autocalibration on

Power-Up

Low Power:

AD7853: 12 mW (VDD = 3 V)

AD7853L: 4.5 mW (VDD = 3 V)

Automatic Power Down After Conversion (25

W)

Flexible Serial Interface:

8051/SPI™/QSPI™/ P Compatible

24-Lead DIP, SOIC and SSOP Packages

APPLICATIONS

Battery-Powered Systems (Personal Digital Assistants,

Medical Instruments, Mobile Communications)

Pen Computers

Instrumentation and Control Systems

High Speed Modems

GENERAL DESCRIPTION

The AD7853/AD7853L are high speed, low power, 12-bit

ADCs that operate from a single 3 V or 5 V power supply, the

AD7853 being optimized for speed and the AD7853L for low

power. The ADC powers up with a set of default conditions at

which time it can be operated as a read-only ADC. The ADC

contains self-calibration and system-calibration options to en-

sure accurate operation over time and temperature and have a

number of power-down options for low power applications.

The part powers up with a set of default conditions and can

operate as a read only ADC.

The AD7853 is capable of 200 kHz throughput rate while the

AD7853L is capable of 100 kHz throughput rate. The input

track-and-hold acquires a signal in 500 ns and features a pseudo-

differential sampling scheme. The AD7853/AD7853L voltage

range is 0 to VREF with both straight binary and twos comple-

ment output coding. Input signal range is to the supply, and the

part is capable of converting full power signals to 100 kHz.

CMOS construction ensures low power dissipation of typically

4.5 mW for normal operation and 1.15 mW in power-down

mode, with a throughput rate of 10 kSPS (VDD = 3 V). The part

is available in 24-lead, 0.3 inch wide dual-in-line package

(DIP), 24-lead small outline (SOIC) and 24-lead small shrink

outline (SSOP) packages.

PRODUCT HIGHLIGHTS

1. Specified for 3 V and 5 V supplies.

2. Automatic calibration on power-up.

3. Flexible power management options including automatic

power-down after conversion.

4. Operates with reference voltages from 1.2 V to VDD.

5. Analog input ranges from 0 V to VDD.

6. Self- and system calibration.

7. Versatile serial I/O port (SPI/QSPI/8051/

µP).

8. Lower power version AD7853L.

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

Tel: 781/329-4700

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

Fax: 781/326-8703

*Patent pending.

SPI and QSPI are trademarks of Motorola, Incorporated.

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