參數(shù)資料
型號(hào)： MCP3201-BI/SN
廠商： Microchip Technology
文件頁(yè)數(shù)： 9/40頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12BIT 2.7V 1CH SPI 8-SOIC
標(biāo)準(zhǔn)包裝： 100
位數(shù)： 12
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： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOICN
包裝： 管件
輸入數(shù)目和類型： 1 個(gè)單端，單極
產(chǎn)品目錄頁(yè)面： 672 (CN2011-ZH PDF)
1998-2011 Microchip Technology Inc.
DS21290F-page 17
MCP3201
4.0
DEVICE OPERATION
The MCP3201 A/D Converter employs a conventional
SAR architecture. With this architecture, a sample is
acquired on an internal sample/hold capacitor for
1.5 clock cycles starting on the first rising edge of the
serial clock after CS has been pulled low. Following this
sample time, the input switch of the converter opens
and the device uses the collected charge on the
internal sample and hold capacitor to produce a serial
12-bit digital output code. Conversion rates of 100 ksps
are possible on the MCP3201 device. See Section 6.2
for information
on minimum clock rates. Communication with the
device is done using a 3-wire SPI-compatible interface.
4.1
Analog Inputs
The MCP3201 device provides a single pseudo-differ-
ential input. The IN+ input can range from IN- to VREF
(VREF + IN-). The IN- input is limited to ±100 mV from
the VSS rail. The IN- input can be used to cancel small
signal common-mode noise which is present on both
the IN+ and IN- inputs.
For the A/D Converter to meet specification, the charge
holding capacitor (CSAMPLE) must be given enough
time to acquire a 12-bit accurate voltage level during
the 1.5 clock cycle sampling period. The analog input
model is shown in Figure 4-1.
In this diagram, it is shown that the source impedance
(RS) adds to the internal sampling switch (RSS)
impedance, directly affecting the time that is required to
charge the capacitor (CSAMPLE). Consequently, a
larger source impedance increases the offset, gain,
and integral linearity errors of the conversion.
Ideally, the impedance of the signal source should be
near zero. This is achievable with an operational
amplifier such as the MCP601, which has a closed loop
output impedance of tens of ohms. The adverse affects
of higher source impedances are shown in Figure 4-2.
If the voltage level of IN+ is equal to or less than IN-, the
resultant code will be 000h. If the voltage at IN+ is equal
to or greater than {[VREF + (IN-)] - 1 LSB}, then the
output code will be FFFh. If the voltage level at IN- is
more than 1 LSB below VSS, then the voltage level at
the IN+ input will have to go below VSS to see the 000h
output code. Conversely, if IN- is more than 1 LSB
above VSS, then the FFFh code will not be seen unless
the IN+ input level goes above VREF level.
4.2
Reference Input
The reference input (V
REF) determines the analog input
voltage range and the LSB size, as shown below.
EQUATION 4-1:
As the reference input is reduced, the LSB size is
reduced accordingly. The theoretical digital output code
produced by the A/D Converter is a function of the
analog input signal and the reference input as shown
below.
EQUATION 4-2:
When using an external voltage reference device, the
system designer
should
always
refer
to
the
manufacturer’s recommendations for circuit layout.
Any instability in the operation of the reference device
will have a direct effect on the operation of the
A/D Converter.
LSB Size
V
REF
4096
-------------
=
Digital Output Code
4096*V
IN
V
REF
-------------------------
=
Where:
VIN
=
Analog Input Voltage = V(IN+) - V(IN-)
VREF
=
Reference Voltage
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3201-BIST 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 12-Bit A/D Converter with SPI Serial Interface
MCP3201-CI/MS 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit SPI Sgl 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
MCP3201-CI/P 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit SPI Sgl 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
MCP3201-CI/P 制造商:Microchip Technology Inc 功能描述:IC 12BIT ADC 3201 DIP8
MCP3201-CI/SN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit SPI Sgl 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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