AD7873

更新时间： 2024-11-18 22:53:31

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
28页	831K
描述
Touch Screen Digitizer

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中文翻译

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数据手册

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AD7873 数据手册

Touch Screen Digitizer

AD7873

FEATURES

FUNCTIONAL BLOCK DIAGRAM

4-wire touch screen interface

On-chip temperature sensor: −40°C to +85°C

On-chip 2.5 V reference

PENIRQ

Direct battery measurement (0 V to 6 V)

Touch-pressure measurement

Specified throughput rate of 125 kSPS

Single supply, V_CCof 2.2 V to 5.25 V

Ratiometric conversion

High speed serial interface

Programmable 8-bit or 12-bit resolution

One auxiliary analog input

PEN

TEMP

SENSOR

INTERRUPT

X+

X–

AD7873

Y+

Y–

T/H

6-TO-1

I/P

MUX

AUX

COMP

BATTERY

MONITOR

Shutdown mode: 1 µA max

16-lead QSOP, TSSOP, and LFCSP packages

BAT

APPLICATIONS

REF

GND

Personal digital assistants

Smart hand-held devices

Touch screen monitors

Point-of-sale terminals

Pagers

CHARGE

REDISTRIBUTION

DAC

2.5V

REF

BUF

SAR + ADC

CONTROL LOGIC

GENERAL DESCRIPTION

The AD7873 is a 12-bit successive approximation ADC with a

synchronous serial interface and low on resistance switches for

driving touch screens. The AD7873 operates from a single 2.2 V

to 5.25 V power supply and features throughput rates greater

than 125 kSPS.

SPORT

DIN

DOUT

DCLK

BUSY

Figure 1.

The AD7873 features direct battery measurement, temperature

measurement, and touch-pressure measurement. The AD7873

also has an on-board reference of 2.5 V that can be used for the

auxiliary input, battery monitor, and temperature measurement

modes. When not in use, the internal reference can be shut

down to conserve power. An external reference can also be

applied and can be varied from 1 V to V_CC, while the analog

input range is from 0 V to V_REF. The device includes a shutdown

mode that reduces the current consumption to less than 1 µA.

PRODUCT HIGHLIGHTS

1. Ratiometric conversion mode available, eliminating errors

due to on-board switch resistances.

2. On-board temperature sensor: −40°C to +85°C.

3. Battery monitor input.

4. Touch-pressure measurement capability.

5. Low power consumption of 1.37 mW max with the

reference off, or 2.41 mW typ with the reference on, at

125 kSPS and V_CCat 3.6 V.

The AD7873 features on-board switches. This, coupled with low

power and high speed operation, makes the 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 package

(QSOP), a 16-lead thin shrink small outline package (TSSOP),

and a 16-lead lead frame chip scale package (LFCSP).

6. Package options include 4 mm × 4 mm LFCSP.

7. Analog input range from 0 V to V_REF

8. Versatile serial I/O ports.

Rev. D

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

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与AD7873相关器件

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AD7873ACP	ADI	获取价格	Touch Screen Digitizer
AD7873ACP	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, QCC16, 4 X 4 MM, MO-220VGGC, LFCSP-16
AD7873ACP-REEL7	ADI	获取价格	Touch Screen Digitizer
AD7873ACPZ	ADI	获取价格	Touch Screen Digitizer
AD7873ACPZ3	ADI	获取价格	Touch Screen Digitizer
AD7873ACPZ-REEL	ADI	获取价格	Touch Screen Digitizer
AD7873ACPZ-REEL7	ADI	获取价格	Touch Screen Digitizer
AD7873ARQ	ADI	获取价格	Touch Screen Digitizer
AD7873ARQ	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PDSO16, 0.150 INCH, MO-137AB, QSOP-16
AD7873ARQ-REEL	ADI	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PDSO16, 0.150 INCH, MO-137AB, QSOP-16, Consumer IC:Other

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