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參數(shù)資料
| 型號： | MCP4432-104E/ST |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RHEO 100K QUAD 7BIT 14TSSOP |
| 標準包裝： | 96 |
| 接片： | 129 |
| 電阻（歐姆）： | 100k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標準值 150 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | I²C（設備位址） |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 14-TSSOP |
| 包裝： | 管件 |
16
Digital Potentiometer Design Guide
Digital Potentiometer Solutions
Voltage Windowing
Resistance Options and Resolutions
Microchip offers Digital Potentiometer devices with typical
RAB resistances of 2.1 KΩ, 5 KΩ, 10 KΩ, 50 KΩ and 100
KΩ. The devices offer either 6-, 7- or 8-bits of resolution.
The step resistance (RS) is the RAB resistances divided by
the number of RS resistors in the RAB ladder.
The step resistance is important to understand when
you are using the device in a rheostat mode, or the
potentiometer is being windowed by resistors on the
Terminal A and/or on the Terminal B.
Voltage Windowing
Terminal A and Terminal B may for example be any
voltage within the device specification limits. Lets call the
voltages at these nodes VA and VB. So the voltage across
the resistor RAB (VAB) is | VA - VB |. The VAB voltage is
determined by the values of the R1, R2 and RAB resistors.
As the VAB voltage becomes smaller relative to the voltage
range, the effective resolution of the device increase,
though the resolution is limited to between the VA and VB
voltages.
This allows a less precise device to be used for more
precise circuit tuning over a narrower range. When
replacing a mechanical potentiometer, this configuration
can be used and R1 and R2 may be any resistance
(including 0).
Resistance Options
RAB
6-bit (63)
7-bit (127)
7-bit (128)
8-bit (256)
2100
33.33333333
–
5000
79.36507937
39.37007874
39.0625
19.53125
10000
158.7301587
78.74015748
78.125
39.0625
50000
793.6507937
393.7007874
390.625
195.3125
100000
–
787.4015748
781.25
390.625
How the VAB Voltage Effects the Effective Resolution
VAB
mV per Step
Effective VAB Resolution vs. Fixed VDD
Comment
6-bit (63)
7-bit (127)
7-bit (128)
8-bit (256)
6-bit (63)
7-bit (127)
7-bit (128)
8-bit (256)
5.00
79.4E
39.4E
39.1E
19.5E
6-bit
7-bit
8-bit
VAB = VDD
2.50
39.7E
19.7E
19.5E
9.8E
7-bit
8-bit
9-bit
VDD = 5.0V
1.25
19.8E
9.8E
4.9E
8-bit
9-bit
10-bit
VDD = 5.0V
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