参数资料
型号: MCP3208-CI/SL
厂商: Microchip Technology
文件页数: 17/40页
文件大小: 0K
描述: IC ADC 12BIT 2.7V 8CH SPI 16SOIC
标准包装: 50
位数: 12
采样率(每秒): 100k
数据接口: 串行,SPI?
转换器数目: 1
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 管件
输入数目和类型: 8 个单端,单极;4 个伪差分,单极
产品目录页面: 672 (CN2011-ZH PDF)
MCP3204/3208
DS21298E-page 24
2008 Microchip Technology Inc.
6.5
Utilizing the Digital and Analog
Ground Pins
The MCP3204/3208 devices provide both digital and
analog ground connections to provide another means
of noise reduction. As shown in Figure 6-5, the analog
and digital circuitry is separated internal to the device.
This reduces noise from the digital portion of the device
being coupled into the analog portion of the device. The
two grounds are connected internally through the
substrate, which has a resistance of 5 -10.
If no ground plane is utilized, then both grounds must
be connected to VSS on the board. If a ground plane is
available, both digital and analog ground pins should
be connected to the analog ground plane. If both an
analog and a digital ground plane are available, both
the digital and the analog ground pins should be
connected to the analog ground plane. Following these
steps will reduce the amount of digital noise from the
rest of the board being coupled into the A/D converter.
FIGURE 6-5:
Separation of Analog and
Digital Ground Pins.
MCP3204/08
Analog Ground Plane
DGND
AGND
V
DD
0.1 F
Substrate
5 - 10
Digital Side
-SPI Interface
-Shift Register
-Control Logic
Analog Side
-Sample Cap
-Capacitor Array
-Comparator
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