ADS78434-WIRETOUCHSCREENINTERFACE资源-CSDN文库

需积分: 5 76 浏览量 2013-08-15 13:37:19 上传评论收藏 164KB PDF 举报

资源详情

资源评论

ADS7843

FEATURES

● 4-WIRE TOUCH SCREEN INTERFACE

● RATIOMETRIC CONVERSION

● SINGLE SUPPLY: 2.7V to 5V

● UP TO 125kHz CONVERSION RATE

● SERIAL INTERFACE

● PROGRAMMABLE 8- OR 12-BIT RESOLUTION

● 2 AUXILIARY ANALOG INPUTS

● FULL POWER-DOWN CONTROL

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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

DESCRIPTION

The ADS7843 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

, 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 ADS7843 is guaranteed down to 2.7V

operation.

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

the ADS7843 ideal for battery operated systems such

as personal digital assistants with resistive touch screens

and other portable equipment. The ADS7843 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

1997 Burr-Brown Corporation PDS-1441C Printed in U.S.A. June, 1998

TOUCH SCREEN CONTROLLER

CDAC

SAR

Comparator

Four

Channel

Multiplexer

Serial

Interface

and

Control

DIN

DOUT

BUSY

DCLK

X+

PENIRQ

X–

Y+

Y–

IN3

IN4

REF

ADS7843

PARAMETER CONDITIONS MIN TYP MAX UNITS

ANALOG INPUT

Full-Scale Input Span Positive Input - Negative Input 0 V

REF

Absolute Input Range Positive Input –0.2 +V

+0.2 V

Negative Input –0.2 +0.2 V

Capacitance 25 pF

Leakage Current 0.1 µA

SYSTEM PERFORMANCE

Resolution 12 Bits

No Missing Codes 11 Bits

Integral Linearity Error ±2 LSB

(1)

Offset Error ±6 LSB

Offset Error Match 0.1 1.0 LSB

Gain Error ±4 LSB

Gain Error Match 0.1 1.0 LSB

Noise 30 µVrms

Power Supply Rejection 70 dB

SAMPLING DYNAMICS

Conversion Time 12 Clk Cycles

Acquisition Time 3 Clk Cycles

Throughput Rate 125 kHz

Multiplexer Settling Time 500 ns

Aperture Delay 30 ns

Aperture Jitter 100 ps

Channel-to-Channel Isolation V

= 2.5Vp-p at 50kHz 100 dB

SWITCH DRIVERS

On-Resistance

Y+, X+ 5 Ω

Y–, X– 6 Ω

REFERENCE INPUT

Range 1.0 +V

Resistance CS = GND or +V

5GΩ

Input Current 13 40 µA

SAMPLE

= 12.5kHz 2.5 µA

CS = +V

0.001 3 µA

DIGITAL INPUT/OUTPUT

Logic Family CMOS

Logic Levels, Except PENIRQ

| I

| ≤ +5µA+V

• 0.7 +V

+0.3

| I

| ≤ +5µA –0.3 +0.8 V

= –250µA+V

• 0.8 V

= 250µA 0.4 V

PENIRQ

= 0°C to +85°C, 100kΩ Pull-Up 0.8 V

Data Format Straight Binary

POWER SUPPLY REQUIREMENTS

Specified Performance 2.7 3.6 V

Quiescent Current 280 650 µA

SAMPLE

= 12.5kHz 220 µA

Shut Down Mode with 3 µA

DCLK = DIN = +V

Power Dissipation +V

= +2.7V 1.8 mW

TEMPERATURE RANGE

Specified Performance –40 +85 °C

SPECIFICATIONS

At T

=–40°C to +85°C, +V

= +2.7V, V

REF

= +2.5V, f

SAMPLE

= 125kHz, f

CLK

= 16 • f

SAMPLE

= 2MHz, 12-bit mode, and digital inputs = GND or +V

, unless

otherwise noted.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes

no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change

without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant

any BURR-BROWN product for use in life support devices and/or systems.

ADS7843E

NOTE: (1) LSB means Least Significant Bit. With V

REF

equal to +2.5V, one LSB is 610µV.

3 ADS7843

X+

Y+

X–

Y–

GND

IN3

IN4

DCLK

DIN

BUSY

DOUT

PENIRQ

REF

ADS7843

PIN CONFIGURATION

Top View SSOP

PIN DESCRIPTION

PIN NAME DESCRIPTION

1+V

Power Supply, 2.7V to 5V.

2 X+ X+ Position Input. ADC input Channel 1.

3 Y+ Y+ Position Input. ADC input Channel 2.

4 X– X– Position Input.

5 Y– Y– Position Input.

6 GND Ground

7 IN3 Auxiliary Input 1. ADC input Channel 3.

8 IN4 Auxiliary Input 2. ADC input Channel 4.

REF

Voltage Reference Input

10 +V

Power Supply, 2.7V to 5V.

11 PENIRQ Pen Interrupt. Open anode output (requires 10kΩ

to 100kΩ pull-up resistor externally).

12 DOUT Serial Data Output. Data is shifted on the falling

edge of DCLK. This output is high impedance

when CS is HIGH.

13 BUSY Busy Output. This output is high impedance when

CS is HIGH.

14 DIN Serial Data Input. If CS is LOW, data is latched on

rising edge of DCLK.

15 CS Chip Select Input. Controls conversion timing and

enables the serial input/output register.

16 DCLK External Clock Input. This clock runs the SAR con-

version process and synchronizes serial data I/O.

ABSOLUTE MAXIMUM RATINGS

(1)

to GND ........................................................................ –0.3V to +6V

Analog Inputs to GND ............................................ –0.3V to +V

+ 0.3V

Digital Inputs to GND ............................................. –0.3V to +V

+ 0.3V

Power Dissipation .......................................................................... 250mW

Maximum Junction Temperature ................................................... +150°C

Operating Temperature Range ........................................–40°C to +85°C

Storage Temperature Range ......................................... –65°C to +150°C

Lead Temperature (soldering, 10s) ............................................... +300°C

NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”

may cause permanent damage to the device. Exposure to absolute maximum

conditions for extended periods may affect device reliability.

ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown

recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and

installation procedures can cause damage.

ESD damage can range from subtle performance degradation to

complete device failure. Precision integrated circuits may be

more susceptible to damage because very small parametric

changes could cause the device not to meet its published specifi-

cations.

MAXIMUM

INTEGRAL PACKAGE SPECIFICATION

LINEARITY DRAWING TEMPERATURE ORDERING TRANSPORT

PRODUCT ERROR (LSB) PACKAGE NUMBER

(1)

RANGE NUMBER

(2)

MEDIA

ADS7843E ±2 16-Lead SSOP 322 –40°C to +85°C ADS7843E Rails

"" "" "ADS7843E/2K5 Tape and Reel

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are

available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “ADS7843E/2K5” will get a single

2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.

PACKAGE/ORDERING INFORMATION

剩余11页未读，继续阅读

评论收藏

内容反馈

ADS7843 4-WIRE TOUCH SCREEN INTERFACE

评论0

最新资源

ADS7843 4-WIRE TOUCH SCREEN INTERFACE

评论0

最新资源

相关推荐

s3c6410硬件ADC & TOUCH SCREEN INTERFACE（AD转化和触摸屏接口）

ads-windows-x86-20.6.0-4.exe

NSF-PROD-ADS-V4-DC-黑洞旁路配置手册

ads-windows-x64-12.0.23.part4

ADS7846TOUCH SCREEN CONTROLLER

ADS7843-driver.rar_51 ads78_ADS7843_触摸屏

ADS7843驱动程序

ads-patch-b848

TSC2046触摸屏控制

touch_me.rar_ADS7843_ADS7843 FPGA _FPGA ADS7843_Touch Me_VHDL AD

ads1.2----1.rar

中文ads7843规格书

OpenRTB-Native-Ads-Specification-Final-1.2.pdf

ADS-B-Transmitter-Receiver-master_ADS-B_ADS-Bcode_

触摸屏(ADS7843)驱动源码

ads-windows-x64-18.5.0.zip

Ads7843.pdf

ads-windows-x64-12.0.23.part1

play-services-ads-lite-18.3.0.zip

触摸芯片ADS7843+STM32触摸屏教程

串口助手工具合集.zip

OLED显示温度和时间-STM32F103C8T6（完整程序工程+原理图+相关资料）.zip

pn532模拟资料包.zip

Vivado license 永久

STM32全系列 Keil MDK pack包（当前最新离线包）

张飞硬件1~20部+笔记完整版百度网盘链接.txt

AD Type C 封装库 6Pin 24Pin分享（带3D视图）

STM32HAL库+RS485+串口+定时器+Modbus协议（主机+从机测试）

I2C主机及从机Verilog代码实现.zip