參數(shù)資料
型號： MCP4019T-503E/LT
廠商： Microchip Technology
文件頁數(shù)： 39/51頁
文件大?。?/td> 0K
描述： IC DGTL POT 50K 128TAPS SC70-5
標準包裝： 1
接片： 128
電阻（歐姆）： 50k
電路數(shù)： 1
溫度系數(shù)： 標準值 150 ppm/°C
存儲器類型： 易失
接口： I²C
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： 6-TSSOP（5 引線），SC-88A，SOT-353
供應商設(shè)備封裝： SC-70-5
包裝： 標準包裝
產(chǎn)品目錄頁面： 674 (CN2011-ZH PDF)
其它名稱： MCP4019T-503E/LTDKR
MCP4017/18/19
DS22147A-page 44
2009 Microchip Technology Inc.
6.3
Wiper Resistance
Wiper resistance is the series resistance of the analog
switch that connects the selected resistor ladder node
to the Wiper Terminal common signal (see Figure 6-1).
A value in the volatile wiper register selects which
analog switch to close, connecting the W terminal to
the selected node of the resistor ladder.
The resistance is dependent on the voltages on the
analog switch source, gate, and drain nodes, as well as
the device’s wiper code, temperature, and the current
through the switch. As the device voltage decreases,
the wiper resistance increases (see Figure 6-4 and
The wiper can connect directly to Terminal B or to
Terminal A. A zero scale connections, connects the
Terminal W (wiper) to Terminal B (wiper setting of
000h). A full scale connections, connects the Terminal
W (wiper) to Terminal A (wiper setting of 7Fh). In these
configurations the only resistance between the
Terminal W and the other Terminal (A or B) is that of the
analog switches.
The wiper resistance is typically measured when the
wiper is positioned at either zero scale (00h) or full
scale (3Fh).
The wiper resistance in potentiometer-generated
voltage divider applications is not a significant source
of error.
The wiper resistance in rheostat applications can
create significant nonlinearity as the wiper is moved
toward zero scale (00h). The lower the nominal
resistance, the greater the possible error.
In a rheostat configuration, this change in voltage
needs to be taken into account. Particularly for the
lower resistance devices. For the 5.0 k
Ω device the
maximum wiper resistance at 5.5V is approximately
3.2% of the total resistance, while at 2.7V it is
approximately 6.5% of the total resistance.
In a potentiometer configuration, the wiper resistance
variation does not effect the output voltage seen on the
W pin.
The slope of the resistance has a linear area (at the
higher voltages) and a non-linear area (at the lower
voltages). In where resistance increases faster then the
voltage drop (at low voltages).
FIGURE 6-4:
Relationship of Wiper
Resistance (RW) to Voltage.
Since there is minimal variation of the total device
resistance over voltage, at a constant temperature (see
the change in wiper resistance over voltage can have a
significant impact on the INL and DNL error.
TABLE 6-4:
TYPICAL STEP RESISTANCES AND RELATIONSHIP TO WIPER RESISTANCE
RW
VDD
Note: The slope of the resistance has a linear
area (at the higher voltages) and a
non-linear area (at the lower voltages).
Resistance (
Ω)RW / RS (%) (1)
RW / RAB (%) (2)
Typical
Wiper (RW)
RW =
Typical
RW = Max
@ 5.5V
RW = Max
@ 2.7V
RW =
Typical
RW = Max
@ 5.5V
RW = Max
@ 2.7V
Total
(RAB)
Step
(RS)
Typical
Max @
5.5V
Max @
2.7V
5000
39.37
100
170
325
254.00%
431.80%
825.5%
2.00%
3.40%
6.50%
10000
78.74
100
170
325
127.00%
215.90%
412.75%
1.00%
1.70%
3.25%
50000
393.70
100
170
325
25.40%
43.18%
82.55%
0.20%
0.34%
0.65%
100000
787.40
100
170
325
12.70%
21.59%
41.28%
0.10%
0.17%
0.325%
Note 1: RS is the typical value. The variation of this resistance is minimal over voltage.
2: RAB is the typical value. The variation of this resistance is minimal over voltage.
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