参数资料
型号: MCP3422A0T-E/MS
厂商: Microchip Technology
文件页数: 8/58页
文件大小: 0K
描述: IC ADC 18BIT 3.75SPS 2CH 8-MSOP
产品培训模块: MCP3901 Analog Front End
标准包装: 2,500
位数: 18
采样率(每秒): 3.75
数据接口: I²C,串行
转换器数目: 1
电压电源: 单电源
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
输入数目和类型: 4 个单端,双极;2 个差分,双极
配用: MCP3422EV-ND - BOARD EVAL MCP3422 PICKIT SERIAL
其它名称: MCP3422A0T-E/MSTR
MCP3422/3/4
DS22088C-page 16
2009 Microchip Technology Inc.
4.9.2
CONVERTING THE DEVICE
OUTPUT CODE TO INPUT SIGNAL
VOLTAGE
When the user gets the digital output codes from the
device as described in Section 4.9.1 “Digital output
code from device”, the next step is converting the
digital output codes to a measured input voltage.
Equation 4-4 shows an example of converting the
output codes to its corresponding input voltage.
If the sign indicator bit (MSB) is ‘0’, the input voltage
is obtained by multiplying the output code with the LSB
and divided by the PGA setting.
If the sign indicator bit (MSB) is ‘1’, the output code
needs to be converted to two’s complement before
multiplied by LSB and divided by the PGA setting.
Table 4-4 shows an example of converting the device
output codes to input voltage.
EQUATION 4-4:
CONVERTING OUTPUT
CODES TO INPUT
VOLTAGE
TABLE 4-4:
EXAMPLE OF CONVERTING OUTPUT CODE TO VOLTAGE (WITH 18 BIT SETTING)
If MSB = 0 (Positive Output Code):
If MSB = 1 (Negative Output Code):
Where:
LSB
=
2’s complement
=
1’s complement + 1
Input Voltage
(Output Code)
LSB
PGA
------------
=
Input Voltage
(2
s complement of Output Code)
LSB
PGA
------------
=
Input Voltage
[CHn+ - CHn-]
PGA]
Digital Output Code
MSB
Example of Converting Output Codes to Input Voltage
≥ V
REF
011111111111111111
0
(2
16+215+214+213+212+211+210+29+28+27+26+25+24+23+22+21+20)
x LSB(15.625
μV)/PGA = 2.048 (V) for PGA = 1
VREF - 1 LSB
011111111111111111
0
(2
16+215+214+213+212+211+210+29+28+27+26+25+24+23+22+21+20)
x LSB(15.625
μV)/PGA = 2.048 (V) for PGA = 1
2LSB
000000000000000010
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
1+0)x LSB(15.625
μV)/PGA
= 31.25
(μV) for PGA = 1
1LSB
000000000000000001
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
0)x LSB(15.625
μV)/PGA
= 15.625 (
μV)for PGA = 1
0
000000000000000000
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0)x LSB(15.625
μV)/PGA
= 0 V (V) for PGA = 1
-1 LSB
111111111111111111
1
-(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
0)x LSB(15.625
μV)/PGA
= - 15.625 (
μV)for PGA = 1
-2 LSB
111111111111111110
1
-(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
1+0)x LSB(15.625
μV)/PGA
= - 31.25 (
μV)for PGA = 1
- VREF
100000000000000000
1
-(2
17+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x
LSB(15.625
μV)/PGA = - 2.048 (V) for PGA = 1
≤ -V
REF
100000000000000000
1
-(2
17+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x
LSB(15.625
μV)/PGA = - 2.048 (V) for PGA = 1
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