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ADS7845 PDF预览

ADS7845

更新时间: 2024-11-09 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

ADS7845 数据手册

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®
ADS7845  
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 (VREF) can be varied between 1V and  
+VCC, providing a corresponding input voltage range  
of 0V to VREF. 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  
+VCC  
GND  
UR  
LR  
GND  
Driver  
+VCC  
SAR  
UL  
LL  
ADS7845  
DOUT  
BUSY  
Comparator  
Serial  
Data  
Interface  
and  
+VCC  
GND  
CS  
CDAC  
Control  
DCLK  
DIN  
AUX IN  
MUX  
WIPER  
PENIRQ  
VREF  
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  
©1998 Burr-Brown Corporation  
PDS-1497A  
Printed in U.S.A. December, 1998  
SBAS104  

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