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| 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)： | 14/34頁 |
| 文件大?。?/td> | 673K |
| 代理商： | MCP3204 |
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MCP3204/3208
DS21298C-page 14
2002 Microchip Technology Inc.
This diagram illustrates that the source impedance (R
S
)
adds to the internal sampling switch (R
SS
) impedance,
directly effecting the time that is required to charge the
capacitor (Csample). Consequently, larger source
impedances increase the offset, gain and integral
linearity errors of the conversion (see Figure 4-2).
4.2
Reference Input
For each device in the family, the reference input
(V
REF
) determines the analog input voltage range. As
the reference input is reduced, the LSB size is reduced
accordingly. The theoretical digital output code pro-
duced by the A/D converter is a function of the analog
input signal and the reference input, as shown below.
EQUATION
When using an external voltage reference device, the
system designer should always refer to the manufac-
turer’s recommendations for circuit layout. Any instabil-
ity in the operation of the reference device will have a
direct effect on the operation of the A/D converter.
FIGURE 4-1:
Analog Input Model.
FIGURE 4-2:
vs. Input resistance (R
S
) to maintain less than a
0.1 LSB deviation in INL from nominal
conditions.
Maximum Clock Frequency
Digital Output Code
4096
--------------------------
V
×
V
REF
=
V
IN
= analog input voltage
V
REF
= reference voltage
C
PIN
7 pF
VA
R
SS
CHx
V
T
= 0.6V
V
T
= 0.6V
I
LEAKAGE
±1 nA
Sampling
Switch
SS
R
S
= 1 k
C
SAMPLE
= DAC capacitance
= 20 pF
V
SS
V
DD
Legend
VA
=
Signal Source
I
leakage
=
Leakage Current At The Pin
Due To Various Junctions
R
ss
CHx
=
=
=
=
Source Impedance
SS
=
=
=
Sampling switch
Input Channel Pad
R
s
Sampling switch resistor
C
pin
V
t
Input Pin Capacitance
C
sample
Sample/hold capacitance
Threshold Voltage
0.0
0.5
1.0
1.5
2.0
2.5
100
1000
10000
Input Resistance (Ohms)
C
V
DD
= 5 V
V
DD
= 2.7 V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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