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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轉換器具有SPI串行接口 |
| 文件頁數(shù)： | 15/40頁 |
| 文件大?。?/td> | 666K |
| 代理商： | MCP3304 |
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2002 Microchip Technology Inc.
DS21697B-page 15
MCP3302/04
4.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 4-1.
TABLE 4-1:
PIN FUNCTION TABLE
4.1
CH0-CH7
Analog input channels. These pins have an absolute
voltage range of V
SS
- 0.3V to V
DD
+ 0.3V. The full scale
differential input range is defined as the absolute value
of (IN+) - (IN-). This difference can not exceed the
value of V
REF
- 1 LSB or digital code saturation will
occur.
4.2
DGND
Ground connection to internal digital circuitry. To
ensure accuracy this pin must be connected to the
same ground as AGND. If an analog ground plane is
available, it is recommended that this device be tied to
the analog ground plane in the circuit. See Section 6.6
for more information regarding circuit layout.
4.3
Chip Select/Shutdown (CS/SHDN)
The CS/SHDN pin is used to initiate communication
with the device when pulled low. This pin will end a con-
version and put the device in low power standby when
pulled high. The CS/SHDN pin must be pulled high
between conversions and cannot be tied low for multi-
ple conversions. See Figure 7-2 for serial communica-
tion protocol.
4.4
Serial Data Input (D
IN
)
The SPI port serial data input pin is used to clock in
input channel configuration data. Data is latched on the
rising edge of the clock. See Figure 7-2 for serial com-
munication protocol.
4.5
Serial Data Output (D
OUT
)
The SPI serial data output pin is used to shift out the
results of the A/D conversion. Data will always change
on the falling edge of each clock as the conversion
takes place. See Figure 7-2 for serial communication
protocol.
4.6
Serial Clock (CLK)
The SPI clock pin is used to initiate a conversion and to
clock out each bit of the conversion as it takes place.
See Section 6.2 for constraints on clock speed. See
Figure 7-2 for serial communication protocol.
4.7
AGND
Ground connection to internal analog circuitry. To
ensure accuracy, this pin must be connected to the
same ground as DGND. If an analog ground plane is
available, it is recommended that this device be tied to
the analog ground plane in the circuit. See Section 6.6
for more information regarding circuit layout.
4.8
Voltage Reference (V
REF
)
This input pin provides the reference voltage for the
device, which determines the maximum range of the
analog input signal and the LSB size.
The LSB size is determined according to the equation
shown below. As the reference input is reduced, the
LSB size is reduced accordingly.
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 accuracy of the ADC conversion
results.
4.9
V
DD
The voltage on this pin can range from 2.7 to 5.5V. To
ensure accuracy, a 0.1
μ
F ceramic bypass capacitor
should be placed as close as possible to the pin. See
Section 6.6 for more information regarding circuit lay-
out.
Name
Function
CH0-CH7
DGND
CS/SHDN
D
IN
D
OUT
CLK
AGND
V
REF
V
DD
Analog Inputs
Digital Ground
Chip Select / Shutdown Input
Serial Data In
Serial Data Out
Serial Clock
Analog Ground
Reference Voltage Input
+2.7V to 5.5V Power Supply
LSB Size =2 x V
REF
8192
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| MCP3304-BI/P | 功能描述:模數(shù)轉換器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MCP3304-BI/SL | 功能描述:模數(shù)轉換器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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)轉換器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MCP3304-CI/SL | 功能描述:模數(shù)轉換器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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