Datasheet > AD7889ARS-2

AD7889ARS-2

更新时间： 2024-09-29 21:07:07

品牌	Logo	应用领域
亚德诺 - ADI		光电二极管转换器
页数	文件大小	规格书
41页	780K
描述
IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Digital Converter

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AD7889ARS-2 数据手册

Low Voltage Controller for Touch Screens

AD7879/AD7889

FUNCTIONAL BLOCK DIAGRAM

FEATURES

/REF

4-wire touch screen interface

1.6 V to 3.6 V operation

X– Y– X+ Y+

Median and averaging filter to reduce noise

Automatic conversion sequencer and timer

User-programmable conversion parameters

Auxiliary analog input/battery monitor (0.5 V to 5 V)

1 optional GPIO

X+

X–

REF–

REF+

Y+

Y–

Interrupt outputs (INT, PENIRQ)

Touch-pressure measurement

Wake-up on touch function

12-BIT

SAR ADC

RESULT

REGISTERS

GND

TEMPERATURE

SENSOR

Shutdown mode: 6 μA maximum

12-ball, 1.6 mm × 2 mm WLCSP

16-lead, 4 mm × 4 mm LFCSP

AD7879/

AD7879-1/

AD7889/

CONTROL

REGISTERS

AD7889-1

APPLICATIONS

Personal digital assistants

Smart handheld devices

Touch screen monitors

Point-of-sale terminals

Medical devices

SEQUENCER

AND TIMER

SERIAL PORT

RESULT

REGISTERS

CS/

DIN/ DOUT/ SCL

ADD0 ADD1 SDA

Cell phones

Figure 1.

GENERAL DESCRIPTION

The AD7879/AD7889 are 12-bit successive approximation

analog-to-digital converters (SAR ADCs) with a synchronous

serial interface and low on-resistance switches for driving 4-wire

resistive touch screens. The AD7879/AD7889 work with a very

low power supply—a single 1.6 V to 3.6 V supply—and feature

throughput rates of 105 kSPS. The devices include a shutdown

mode that reduces current consumption to less than 6 μA.

The AD7879/AD7889 have a programmable pin that can operate

as an auxiliary input to the ADC, as a battery monitor, or as a

GPIO. In addition, a programmable interrupt output can operate

in three modes: as a general-purpose interrupt to signal when

DAV

new data is available (

INT

), as an interrupt to indicate when

limits are exceeded (

), or as a pen-down interrupt when the

PENIRQ

screen is touched (

). The AD7879/AD7889 offer temp-

erature measurement and touch-pressure measurement.

To reduce the effects of noise from LCDs and other sources, the

AD7879/AD7889 contain a preprocessing block. The prepro-

cessing function consists of a median filter and an averaging

filter. The combination of these two filters provides a more robust

solution, discarding the spurious noise in the signal and keeping

only the data of interest. The size of both filters is programmable.

Other user-programmable conversion controls include variable

acquisition time and first conversion delay; up to 16 averages

can be taken per conversion. The AD7879/AD7889 can run in

slave mode or standalone (master) mode, using an automatic

conversion sequencer and timer.

The AD7879 is available in a 12-ball, 1.6 mm × 2 mm WLCSP

and in a 16-lead, 4 mm × 4 mm LFCSP. The AD7889 is available

in a backside-coated version of the WLCSP. Both parts support

an SPI interface (AD7879/AD7889) or an I²C interface

(AD7879-1/AD7889-1).

Rev. C

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

www.analog.com

12 3 4 5 6 7...41

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与AD7889ARS-2相关器件

型号	品牌	获取价格	描述	数据表
AD7889ARS-3	ADI	获取价格	IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Dig
AD7889BRS-1	ADI	获取价格	IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Dig
AD7890	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890_17	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890AN	ETC	获取价格	MICROCIRCUIT, LINEAR, 8-CHANNEL, 12-BIT SERIAL, DATA ACQUISITION SYSTEM, MONOLITHIC SILICO
AD7890AN-10	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890AN-10	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24, 0.300 INCH, PLASTIC, MS-001, DI
AD7890AN-2	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24, 0.300 INCH, PLASTIC, MS-001, DI
AD7890AN-2	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890AN-4	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

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