ADS7845

更新时间： 2024-11-25 12:52:47

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
16页	323K
描述
5-WIRE TOUCH SCREEN INTERFACE, RATIOMETRIC CONVERSION, SINGLE SUPPLY:2V to 5V

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数据手册

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ADS7845 数据手册

ADS7845

TOUCH SCREEN CONTROLLER

DESCRIPTION

FEATURES

● 5-WIRE TOUCH SCREEN INTERFACE

● RATIOMETRIC CONVERSION

● SINGLE SUPPLY: 2V to 5V

The ADS7845 is a 12-bit sampling analog-to-digital

converter (ADC) with a synchronous serial interface

and low on-resistance switches for driving touch

screens. Typical power dissipation is 750µW at a

125kHz throughput rate and a +2.7V supply. The

reference voltage (V_REF) can be varied between 1V and

+V_CC, providing a corresponding input voltage range

of 0V to V_REF. The device includes a shutdown mode

which reduces typical power dissipation to under

0.5µW. The ADS7845 is guaranteed down to 2.7V

operation.

● UP TO 125kHz CONVERSION RATE

● SERIAL INTERFACE

● PROGRAMMABLE 8- OR 12-BIT RESOLUTION

● AUXILIARY ANALOG INPUTS

● FULL POWER-DOWN CONTROL

Low power, high speed, and on-board switches make

the ADS7845 ideal for battery-operated systems such

as personal digital assistants with resistive touch screens

and other portable equipment. The ADS7845 is avail-

able in a 16-lead SSOP package and is guaranteed

over the –40°C to +85°C temperature range.

APPLICATIONS

● PERSONAL DIGITAL ASSISTANTS

● PORTABLE INSTRUMENTS

● POINT-OF-SALES TERMINALS

● PAGERS

● TOUCH-SCREEN MONITORS

+V_CC

GND

Driver

+V_CC

SAR

ADS7845

DOUT

BUSY

Comparator

Serial

Data

Interface

and

+V_CC

GND

CDAC

Control

DCLK

DIN

AUX IN

MUX

WIPER

PENIRQ

V_REF

International Airport Industrial Park

•

Mailing Address: PO Box 11400, Tucson, AZ 85734

•

Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706

• Tel: (520) 746-1111

Twx: 910-952-1111

•

Internet: http://www.burr-brown.com/

•

Cable: BBRCORP

•

Telex: 066-6491

•

FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132

•

PDS-1497A

Printed in U.S.A. December, 1998

SBAS104

12 3 4 5 6 7...16

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