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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/40頁 |
| 文件大?。?/td> | 666K |
| 代理商： | MCP3304 |
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MCP3302/04
DS21697B-page 18
2002 Microchip Technology Inc.
FIGURE 6-3:
Analog Input Model.
6.2.1
MAINTAINING MINIMUM CLOCK
SPEED
When the MCP3302/04 initiates, charge is stored on
the sample capacitor. When the sample period is com-
plete, the device converts one bit for each clock that is
received. It is important for the user to note that a slow
clock rate will allow charge to bleed off the sample cap
while the conversion is taking place. For the MCP330X
devices, the recommended minimum clock speed dur-
ing the conversion cycle (T
CONV
) is 105 kHz. Failure to
meet this criteria may induce linearity errors into the
conversion outside the rated specifications. It should
be noted that during the entire conversion cycle, the
A/D converter does not have requirements for clock
speed or duty cycle, as long as all timing specifications
are met.
6.3
Biasing Solutions
For pseudo-differential bipolar operation, the biasing
circuit (shown in Figure 6-4) shows a single ended
input AC coupled to the converter. This configuration
will give a digital output range of -4096 to +4095. With
the 2.5V reference, the LSB size equal to 610
μ
V.
Although the ADC is not production tested with a 2.5V
reference as shown, linearity will not change more than
0.1 LSB. See Figure 2-2 and Figure 2-9 for DNL and
INL errors versus V
REF
at V
DD
= 5V. A trade-off exists
between the high pass corner and the acquisition time.
The value of C will need to be quite large in order to
bring down the high pass corner. The value of R will
need to be 1 k
, or less, since higher input impedances
require additional acquisition time. Using the RC values
in Figure 6-4, we have a 100 Hz corner frequency. See
Figure 2-12 for relation between input impedance and
acquisition time.
FIGURE 6-4:
circuit for bipolar operation.
Pseudo-differential biasing
Using an external operation amplifier on the input
allows for gain and also buffers the input signal from the
input to the ADC allowing for a higher source imped-
ance. This circuit is shown in Figure 6-5.
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
= 25 pF
V
SS
V
DD
Legend
VA
=
signal source
R
SS
=
source impedance
CHx
=
input channel pad
C
PIN
=
input pin capacitance
V
T
=
threshold voltage
I
LEAKAGE
=
leakage current at the pin
due to various junctions
SS
=
sampling switch
R
S
=
sampling switch resistor
C
SAMPLE
=
sample/hold capacitance
V
DD
= 5V
0.1 μF
IN+
IN-
V
REF
MCP330X
1 μF
MCP1525
V
IN
V
OUT
0.1 μF
1 k
10 μF
V
IN
R
C
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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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