参数资料
型号: AD7873ACPZ-REEL7
厂商: Analog Devices Inc
文件页数: 17/29页
文件大小: 0K
描述: IC ADC 12BIT TOUCHSCREEN 16LFCSP
标准包装: 1,500
类型: 电阻
触摸面板接口: 4 线
输入数/键: 1 TSC
分辨率(位): 12 b
评估套件: 可供
数据接口: 串行
数据速率/采样率 (SPS,BPS): 125k
电压基准: 外部,内部
电源电压: 2.2 V ~ 5.25 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-VQFN 裸露焊盘,CSP
供应商设备封装: 16-LFCSP-VQ EP(4x4)
包装: 带卷 (TR)
Data Sheet
AD7873
Rev. F | Page 23 of 28
GROUNDING AND LAYOUT
For information on grounding and layout considerations for the
AD7873, refer to Application Note AN-577, Layout and
Grounding Recommendations for Touch Screen Digitizers.
PCB DESIGN GUIDELINES FOR
CHIP SCALE PACKAGE
The lands on the chip scale package (CP-32) are rectangular.
The printed circuit board pad for these should be 0.1 mm
longer than the package land length and 0.05 mm wider than
the package land width. The land should be centered on the
pad. This ensures that the solder joint size is maximized.
The bottom of the chip scale package has a central thermal pad.
The thermal pad on the printed circuit board should be at least
as large as this exposed pad. On the printed circuit board, there
should be a clearance of at least 0.25 mm between the thermal
pad and the inner edges of the pad pattern. This ensures that
shorting is avoided.
Thermal vias can be used on the printed circuit board thermal
pad to improve thermal performance of the package. If vias are
used, they should be incorporated in the thermal pad at 1.2 mm
pitch grid. The via diameter should be between 0.3 mm and
0.33 mm and the via barrel should be plated with 1 oz. copper
to plug the via.
The user should connect the printed circuit board thermal
pad to GND.
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