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参数资料
| 型号： | TMPSNSRD-TCPL1 |
| 厂商： | Microchip Technology |
| 文件页数： | 14/30页 |
| 文件大小： | 0K |
| 描述： | BOARD RTD REFERENCE DESIGN |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 传感器类型： | 温度，热电偶 |
| 嵌入式： | 否 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP3421，MCP9804 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
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Programmable Gain Using Digital Potentiometers
The table below shows a comparison of the gain between the
circuits (a and b) in Figure 1-1 when using the same Digital
Potentiometer (10 kΩ, 7-bit). What you also see is that
when R 1 = R 2 = 10 kΩ, the circuit’s gain range is between 1
and 3. While when the simpli?ed circuit is used (effectively
having R 1 = R 2 = 0Ω) the circuit’s gain range is between ~0
and >127. Therefore the capability for ?ner calibration of
the circuit is capable with the generic circuit, albeit with a
narrower range.
Some devices have an even number of step resistors (R S )
in the R AB string, while others have an odd number. In
the simpli?ed circuit, devices with an even number of R S
resistors have a mid-scale wiper value that is unity gain.
Amplifier Gain vs. Wiper Code and R W
For devices with an odd number of R S resistors have a mid-
scale wiper value that is near unity gain. The MCP4261 is an
example of a device that has an even number of R S resistors
in the R AB string, while the MCP4011 is an example of a
device that has an odd number of R S resistors in the R AB
string.
For devices with an odd number of R S resistors in the R AB
string to be able to have an exact unity gain, the device
would need to be used in the generic circuit con?guration
(Figure 1-1), and the components would need to be selected
so R 1 + R AW could equal R 2 + R BW .
# of
Taps
# of
Resistors
Wiper
Code
Simplified Circuit (1)
10 kΩ Gain
Generic Circuit (1, 2)
Comment
0
1
2
3
4
.
.
.
62
63
0.0
0.007874
0.015873
0.024000
0.032258
.
.
.
0.939394
0.969231
1.000000
1.007843
1.015748
1.023715
1.031746
.
.
.
1.639175
1.652850
Zero Scale
.
.
.
129
128
64
1.000000
1.666667
Mid Scale
65
66
1.031746
1.064516
1.680628
1.694737
.
.
.
124
125
126
127
128
.
.
.
31.000000
41.666667
63.000000
127.000000
Divide Error (3)
.
.
.
2.878788
2.908397
2.938462
2.968992
3.000000
.
.
.
Full Scale
Note 1: Gain = ( (R AB / # of Resistors) * Wiper Code ) /( ( (# of Resistors - Wiper Code) / # of Resistors) * R AB )
2: Uses R 1 = R 2 = 10 kΩ.
3: Theoretical calculations. At full scale in the simplified circuit a divide by 0 error results.
14
Signal Chain Design Guide
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