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AD7873BCP PDF预览

AD7873BCP

更新时间: 2024-02-09 12:22:41
品牌 Logo 应用领域
亚德诺 - ADI 消费电路商用集成电路
页数 文件大小 规格书
28页 831K
描述
Touch Screen Digitizer

AD7873BCP 技术参数

是否无铅: 含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:SSOP
包装说明:SSOP,针数:16
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5
其他特性:FUNCTIONALLY IT OPERATES FROM 2.2 TO 5.25V商用集成电路类型:CONSUMER CIRCUIT
JESD-30 代码:R-PDSO-G16JESD-609代码:e3
长度:4.9022 mm湿度敏感等级:1
功能数量:1端子数量:16
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:SSOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, SHRINK PITCH
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:1.7526 mm最大压摆率:0.38 mA
最大供电电压 (Vsup):3.6 V最小供电电压 (Vsup):2.2 V
表面贴装:YES温度等级:INDUSTRIAL
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:0.635 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:3.9116 mm
Base Number Matches:1

AD7873BCP 数据手册

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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  
+V  
PENIRQ  
CC  
Direct battery measurement (0 V to 6 V)  
Touch-pressure measurement  
Specified throughput rate of 125 kSPS  
Single supply, VCC of 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  
V
BAT  
V
APPLICATIONS  
REF  
GND  
Personal digital assistants  
Smart hand-held devices  
Touch screen monitors  
Point-of-sale terminals  
Pagers  
CHARGE  
REDISTRIBUTION  
DAC  
+V  
CC  
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  
CS  
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 VCC, while the analog  
input range is from 0 V to VREF. 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 VCC at 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 VREF  
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  
© 2004 Analog Devices, Inc. All rights reserved.  

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