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AD7879ACBZ-500R7 PDF预览

AD7879ACBZ-500R7

更新时间： 2024-01-09 13:03:31
品牌 Logo 应用领域
亚德诺 - ADI 转换器模数转换器控制器
页数 文件大小 规格书
36页 664K
描述
Low Voltage Controller for Touch Screens

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AD7879ACBZ-500R7 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：BGA
包装说明：VFBGA,针数：12
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.61
Is Samacsys：N最大模拟输入电压：3.6 V
最小模拟输入电压：转换器类型：ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码：R-PBGA-B12JESD-609代码：e3
长度：2.01 mm最大线性误差 (EL)：0.0732%
湿度敏感等级：1模拟输入通道数量：2
位数：12功能数量：1
端子数量：12最高工作温度：85 °C
最低工作温度：-40 °C输出位码：BINARY
输出格式：SERIAL封装主体材料：PLASTIC/EPOXY
封装代码：VFBGA封装形状：RECTANGULAR
封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH峰值回流温度（摄氏度）：225
认证状态：Not Qualified采样速率：0.105 MHz
采样并保持/跟踪并保持：TRACK座面最大高度：0.65 mm
标称供电电压：2.6 V表面贴装：YES
温度等级：INDUSTRIAL端子面层：MATTE TIN
端子形式：BALL端子节距：0.5 mm
端子位置：BOTTOM处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：1.61 mmBase Number Matches：1

AD7879ACBZ-500R7 数据手册

 浏览型号AD7879ACBZ-500R7的Datasheet PDF文件第2页浏览型号AD7879ACBZ-500R7的Datasheet PDF文件第3页浏览型号AD7879ACBZ-500R7的Datasheet PDF文件第4页浏览型号AD7879ACBZ-500R7的Datasheet PDF文件第5页浏览型号AD7879ACBZ-500R7的Datasheet PDF文件第6页浏览型号AD7879ACBZ-500R7的Datasheet PDF文件第7页 
Low Voltage Controller for Touch Screens  
AD7879  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
/REF  
CC  
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–  
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  
CONTROL  
REGISTERS  
APPLICATIONS  
Personal digital assistants  
Smart hand-held devices  
Touch screen monitors  
Point-of-sale terminals  
Medical devices  
SEQUENCER  
AND TIMER  
SERIAL PORT  
TO  
RESULT  
REGISTERS  
CS/  
DIN/ DOUT/ SCL  
ADD0 ADD1 SDA  
Cell phones  
Figure 1.  
GENERAL DESCRIPTION  
The AD7879 is a 12-bit successive approximation analog-to-  
digital converter (ADC) with a synchronous serial interface and  
low on-resistance switches for driving 4-wire resistive touch  
screens. The AD7879 works with a very low power supply (a  
single 1.6 V to 3.6 V) and features throughput rates of 105 kSPS.  
The AD7879 has a programmable pin that can operate as an  
auxiliary input to the ADC, as a battery monitor, or as a GPIO.  
There is also a programmable interrupt output that can operate  
in three modes: as a general-purpose interrupt to signal when  
INT  
new data is available  
, as an interrupt to indicate when limits  
are exceeded, or as a pen-down interrupt when the screen is  
PENIRQ  
ment and touch-pressure measurement.  
The device includes a shutdown mode that reduces its current  
consumption to less than 6 μA.  
touched (  
). The AD7879 offers temperature measure-  
To reduce the effects of noise from LCDs and other sources,  
the AD7879 contains a preprocessing block. The preprocessing  
function consists of a median and an averaging filter. The com-  
bination of these two techniques 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 can run in either  
slave or standalone 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 part also has either  
an SPI (AD7879) or I2C (AD7879-1) interface.  
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 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  
Fax: 781.461.3113  
www.analog.com  
©2008 Analog Devices, Inc. All rights reserved.  
 
 
 
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