參數(shù)資料
型號(hào)： MCP3304
廠商： Microchip Technology Inc.
英文描述： 13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface
中文描述： 13位差分輸入，低功耗的A / D轉(zhuǎn)換器具有SPI串行接口
文件頁(yè)數(shù)： 20/40頁(yè)
文件大?。?/td> 666K
代理商： MCP3304
MCP3302/04
DS21697B-page 20
2002 Microchip Technology Inc.
6.5
Buffering/Filtering the Analog
Inputs
Inaccurate conversion results may occur if the signal
source for the A/D converter is not a low impedance
source. Buffering the input will overcome the imped-
ance issue. It is also recommended that an analog filter
be used to eliminate any signals that may be aliased
back into the conversion results. This is illustrated in
Figure 6-9, where an op amp is used to drive the ana-
log input of the MCP3302/04. This amplifier provides a
low impedance source for the converter input and a low
pass filter, which eliminates unwanted high frequency
noise. Values shown are for a 10 Hz Butterworth Low
Pass filter.
Low pass (anti-aliasing) filters can be designed using
Microchip’s interactive FilterLab
software. FilterLab
will calculate capacitor and resistor values, as well as
determine the number of poles that are required for the
application. For more information on filtering signals,
see Application Note 699
“Anti-Aliasing Analog Filters
for Data Acquisition Systems
”.
FIGURE 6-9:
Amplifier is used to implement a 2nd order anti-
aliasing filter for the signal being converted by
the MCP3302/04.
The MCP601 Operational
6.6
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 from V
DD
to ground should always be used with this device and
should be placed as close as possible to the device pin.
A bypass capacitor value of 0.1
μ
F is recommended.
Digital and analog traces on the board should be sepa-
rated as much as possible, with no traces running
underneath the device or the bypass capacitor. Extra
precautions should be taken to keep traces with high
frequency signals (such as clock lines) as far as possi-
ble 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 current return paths and associated
errors (see Figure 6-10). For more information on lay-
out tips when using the MCP3302/04, or other ADC
devices, refer to Application Note 688,
“Layout Tips for
12-Bit A/D Converter Applications”
.
FIGURE 6-10:
‘Star’ configuration in order to reduce errors
caused by current return paths.
V
DD
traces arranged in a
MCP330X
V
DD
10 μF
IN-
IN+
-
+
V
IN
2.2 μF
1 μF
V
REF
4.096V
Reference
0.1 μF
1 μF
0.1 μF
MCP601
7.86 k
14.6 k
MCP1541
C
L
V
DD
Connection
Device 1
Device 2
Device 3
Device 4
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3304-BI/P 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13-bit Diff In 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
MCP3304-BI/SL 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13-bit Diff In 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
MCP3304-BI/ST 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface
MCP3304-CI/P 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13-bit Diff In 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
MCP3304-CI/SL 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13-bit Diff In 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
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