參數(shù)資料
型號： mcp3204
廠商： Microchip Technology Inc.
元件分類： 串行ADC
英文描述： 2.7V 4-Channel/8-Channel 12-Bit A/D Converters With SPI Serial Interface(SPI串行接口的4通道12位A/D轉(zhuǎn)換器)
中文描述： 2.7 4-Channel/8-Channel 12位A / D轉(zhuǎn)換器具有SPI串行接口（SPI串行接口的4通道12位的A / D轉(zhuǎn)換器）
文件頁數(shù)： 20/34頁
文件大?。?/td> 673K
代理商： MCP3204
MCP3204/3208
DS21298C-page 20
2002 Microchip Technology Inc.
6.4
Layout Considerations
When laying out a printed circuit board for use with
analog components, care should be taken to reduce
noise wherever possible. A bypass capacitor should
always be used with this device, placed as close as
possible to the device pin. A bypass capacitor value of
1 μF is recommended.
Digital and analog traces should be separated as much
as possible on the board, with no traces running under-
neath the device or the bypass capacitor. Extra precau-
tions should be taken to keep traces with high
frequency signals (such as clock lines) as far as
possible from analog traces.
Use of an analog ground plane is recommended in
order to keep the ground potential the same for all
devices on the board. Providing V
DD
connections to
devices in a “star” configuration can also reduce noise
by eliminating return current paths and associated
errors (see Figure 6-4). For more information on layout
tips when using A/D converters, refer to AN688,
“Layout Tips for 12-Bit A/D converter Applications”
.
FIGURE 6-4:
‘Star’ configuration in order to reduce errors
caused by current return paths.
V
DD
traces arranged in a
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 sub-
strate, which has a resistance of 5 -10
.
If no ground plane is utilized, then both grounds must
be connected to V
SS
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 con-
nected 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:
Digital Ground Pins.
Separation of Analog and
V
DD
Connection
Device 1
Device 2
Device 3
Device 4
MCP3204/08
Analog Ground Plane
DGND
AGND
V
DD
0.1 μF
Substrate
5 - 10
Digital Side
-SPI Interface
-Shift Register
-Control Logic
Analog Side
-Sample Cap
-Capacitor Array
-Comparator
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3204_07 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI⑩ Serial Interface
MCP3204_08 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI Serial Interface
MCP3204-BI/P 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit SPI 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MCP3204-BI/SL 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit SPI 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MCP3204-BI/ST 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI⑩ Serial Interface
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