Datasheet > AD7843ARQ-REEL7

AD7843ARQ-REEL7

更新时间： 2024-01-24 10:11:13

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	191K
描述
Touch Screen Digitizer

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AD7843ARQ-REEL7 数据手册

Touch Screen Digitizer

AD7843

FEATURES

FUNCTIONAL BLOCK DIAGRAM

4-Wire Touch Screen Interface

Specified Throughput Rate of 125 kSPS

Low Power Consumption:

PENIRQ

1.37 mW Max at 125 kSPS with V_CC= 3.6 V

Single Supply, V_CCof 2.2 V to 5.25 V

Ratiometric Conversion

PEN

INTERRUPT

AD7843

X+

X–

High-Speed Serial Interface

Programmable 8- or 12-Bit Resolution

Two Auxiliary Analog Inputs

Y+

Y–

T/H

4-TO-1

Shutdown Mode: 1

␮A max

I/P

16-Lead QSOP and TSSOP Packages

MUX

IN3

IN4

COMP

APPLICATIONS

Personal Digital Assistants

Smart Hand-Held Devices

Touch Screen Monitors

Point-of-Sales Terminals

Pagers

GND

REF

CHARGE

REDISTRIBUTION

DAC

SAR + ADC

CONTROL LOGIC

SPORT

DOUT

GENERAL DESCRIPTION

The AD7843 is a 12-bit successive-approximation ADC with a

synchronous serial interface and low on resistance switches for

driving touch screens. The part operates from a single 2.2 V to

5.25 V power supply and features throughput rates greater than

125 kSPS.

DIN

DCLK

BUSY

PRODUCT HIGHLIGHTS

1. Ratiometric conversion mode available eliminating errors

due to on-board switch resistances.

The external reference applied to the AD7843 can be varied

from 1 V to +V_CC, while the analog input range is from 0 V to

2. Maximum current consumption of 380 µA while operating at

_REF. The device includes a shutdown mode that reduces the

125 kSPS.

current consumption to less than 1 µA.

3. Power-down options available.

The AD7843 features on-board switches. This coupled with low

power and high-speed operation make this device ideal for

battery-powered systems such as personal digital assistants with

resistive touch screens and other portable equipment. The part

is available in a 16-lead 0.15" Quarter Size Outline (QSOP) pack-

age and a 16-lead Thin Shrink Small Outline (TSSOP) package.

4. Analog input range from 0 V to V_REF

5. Versatile serial I/O port.

REV. 0

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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