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)： 22/40頁
文件大?。?/td> 666K
代理商： MCP3304
MCP3302/04
DS21697B-page 22
2002 Microchip Technology Inc.
7.0
SERIAL COMMUNICATIONS
7.1
Output Code Format
The output code format is a binary two’s complement
scheme, with a leading sign bit that indicates the sign
of the output. If the IN+ input is higher than the IN-
input, the sign bit will be a zero. If the IN- input is higher,
the sign bit will be a ‘
1
’.
The diagram shown in Figure 7-1 shows the output
code transfer function. In this diagram, the horizontal
axis is the analog input voltage and the vertical axis is
the output code of the ADC. It shows that when IN+ is
equal to IN-, both the sign bit and the data word is zero.
As IN+ gets larger with respect to IN-, the sign bit is a
zero and the data word gets larger. The full scale output
code is reached at +4095 when the input [(IN+) - (IN-)]
reaches V
REF
- 1 LSB. When IN- is larger than IN+, the
two’s complement output codes will be seen with the
sign bit being a one. Some examples of analog input
levels and corresponding output codes are shown in
Table 7-1.
TABLE 7-1:
BINARY TWO’S
COMPLEMENT OUTPUT
CODE EXAMPLES.
FIGURE 7-1:
Output Code Transfer Function.
Analog Input Levels
Sign
Bit
Binary Data
Decimal
DATA
Full Scale Positive
(IN+)-(IN-)=V
REF
-1 LSB
(IN+)-(IN-) = V
REF
-2 LSB
IN+ = (IN-) +2 LSB
0
1111 1111 1111
+4095
0
1111 1111 1110
+4094
0
0000 0000 0010
+2
IN+ = (IN-) +1 LSB
0
0000 0000 0001
+1
IN+ = IN-
0
0000 0000 0000
0
IN+ = (IN-) - 1 LSB
1
1111 1111 1111
-1
IN+ = (IN-) - 2 LSB
1
1111 1111 1110
-2
(IN+)-(IN-) = V
REF
-2 LSB
Full Scale Negative
(IN+)-(IN-) = V
REF
-1 LSB
1
0000 0000 0001
-4095
1
0000 0000 0000
-4096
IN+ > IN-
IN+ < IN-
0 + 0000 0000 0001 (+1)
0 + 0000 0000 0010 (+2)
0 + 0000 0000 0011 (+3)
1 + 1111 1111 1101 (-3)
1 + 1111 1111 1110 (-2)
1 + 1111 1111 1111 (-1)
0 + 1111 1111 1110 (+4094)
0 + 1111 1111 1111 (+4095)
1 + 0000 0000 0000 (-4096)
1 + 0000 0000 0001 (-4095)
Output
Code
0 + 0000 0000 0000 (0)
V
REF
-V
REF
Positive Full
Scale Output = V
REF
-1 LSB
Negative Full
Scale Output = -V
REF
Analog Input
Voltage
IN+ - IN-
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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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