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參數(shù)資料
| 型號： | MCP3302T-BI/SL |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 13/48頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 13BIT 2.7V 2CH SPI 14SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,600 |
| 位數(shù)： | 13 |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 4 個單端，單極；2 個差分，單極 |
| 其它名稱： | MCP3302TBI/SL |
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MCP3302/04
DS21697F-page 20
2011 Microchip Technology Inc.
5.5
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
impedance 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 5-9, where an op amp is used to
drive the analog 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 detailed information on filtering
signals, see AN699 “Anti-Aliasing, Analog Filters for
Data Acquisition Systems”
, at www.microchip.com.
FIGURE 5-9:
The MCP601 Operational
Amplifier is used to implement a 2nd order anti-
aliasing filter for the signal being converted by
the MCP3302/04.
5.6
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 VDD
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 F is recommended.
Digital and analog traces on the board should be
separated 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
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 VDD connections to
devices in a “star” configuration can also reduce noise
by eliminating current return paths and associated
errors (see Figure 5-10). Layout tips for using the
MCP3302, MCP3304, or other ADC devices, are avail-
able in AN688, “Layout Tips for 12-Bit A/D Converter
Applications”
, from www.microchip.com.
FIGURE 5-10:
VDD traces arranged in a
‘Star’ configuration in order to reduce errors
caused by current return paths.
MCP330X
VDD
10 F
IN-
IN+
-
+
VIN
2.2 F
1F
VREF
4.096V
Reference
0.1 F
1F
0.1 F
MCP601
7.86 k
14.6 k
MCP1541
CL
VDD
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 |
|---|---|
| MCP3302T-CI/P | 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 |
| MCP3302T-CI/SL | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13-bit Diff In 2 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 |
| MCP3302T-CI/ST | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13-bit Diff In 2 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 |
| MCP3302TI/P | 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 |
| MCP3302T-I/P | 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 |
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