參數(shù)資料
型號: MCP4461-502E/ML
廠商: Microchip Technology
文件頁數(shù): 95/100頁
文件大?。?/td> 0K
描述: IC DGTL POT 257TAPS 5K 20QFN
標(biāo)準包裝: 91
接片: 257
電阻(歐姆): 5k
電路數(shù): 4
溫度系數(shù): 標(biāo)準值 150 ppm/°C
存儲器類型: 非易失
接口: I²C(設(shè)備位址)
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 20-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 20-QFN 裸露焊盤(4x4)
包裝: 管件
MCP444X/446X
DS22265A-page 94
2010 Microchip Technology Inc.
Using the simulation models of the NMOS and PMOS
devices for the MCP44XX analog switch (Figure B-10),
we plot the device resistance when the devices are
turned on. Figure B-11 and Figure B-12 show the
resistances of the NMOS and PMOS devices as the
VIN voltage is increased. The wiper resistance (RW) is
simply the parallel resistance on the NMOS and PMOS
devices (RW = RNMOS || RPMOS). Below the threshold
voltage for the NMOS ad PMOS devices, the
resistance becomes very large (Gigaohms). In the
transistors active region, the resistance is much lower.
For these graphs, the resistances are on different
scales. Figure B-13 and Figure B-14 only plot the
NMOS and PMOS device resistance for their active
region and the resulting wiper resistance. For these
graphs, all resistances are on the same scale.
FIGURE B-10:
Analog Switch.
FIGURE B-11:
NMOS and PMOS
Transistor Resistance (RNMOS, RPMOS) and
Wiper Resistance (RW) VS. VIN
(VDD = 3.0V).
FIGURE B-12:
NMOS and PMOS
Transistor Resistance (RNMOS, RPMOS) and
Wiper Resistance (RW) VS. VIN
(VDD = 1.8V).
FIGURE B-13:
NMOS and PMOS
Transistor Resistance (RNMOS, RPMOS) and
Wiper Resistance (RW) VS. VIN
(VDD = 3.0V).
FIGURE B-14:
NMOS and PMOS
Transistor Resistance (RNMOS, RPMOS) and
Wiper Resistance (RW) VS. VIN
(VDD = 1.8V).
RW
NMOS
PMOS
VG (VDD/VSS)
“gate”
VOUT
VIN
0.00E+00
5.00E+09
1.00E+10
1.50E+10
2.00E+10
2.50E+10
3.00E+10
0.0
0.3
0.6
0.9
1.2
1.5
1.8
VIN Voltage
NMOS
and
PMOS
Resistance
()
0
500
1000
1500
2000
2500
Wiper
Resistance
(
)
RPMOS
RNMOS
RW
PMOS
Theshold
NMOS
Theshold
0.00E+00
1.00E+09
2.00E+09
3.00E+09
4.00E+09
5.00E+09
6.00E+09
7.00E+09
0.0
0.6
1.2
1.8
2.4
3.0
VIN Voltage
NMOS
and
PMOS
Resistance
()
0
20
40
60
80
100
120
140
160
Wiper
Resistance
(
)
RPMOS
RNMOS
RW
PMOS
Theshold
NMOS
Theshold
0
50
100
150
200
250
300
0.0
0.6
1.2
1.8
2.4
3.0
VIN Voltage
Resistance
()
RPMOS
RNMOS
RW
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
0.0
0.3
0.6
0.9
1.2
1.5
1.8
VIN Voltage
Resistance
()
RPMOS
RNMOS
RW
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