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参数资料
型号： MCP4461T-103E/ML
厂商： Microchip Technology
文件页数： 93/100页
文件大小： 0K
描述： IC DGTL POT 257TAPS 10K 20QFN
标准包装： 3,300
接片： 257
电阻（欧姆）： 10k
电路数： 4
温度系数： 标准值 150 ppm/°C
存储器类型： 非易失
接口： I²C（设备位址）
电源电压： 2.7 V ~ 5.5 V
工作温度： -40°C ~ 125°C
安装类型： 表面贴装
封装/外壳： 20-VFQFN 裸露焊盘
供应商设备封装： 20-QFN 裸露焊盘（4x4）
包装： 带卷 (TR)
MCP444X/446X
DS22265A-page 92
2010 Microchip Technology Inc.
Figure B-3 and Figure B-4 show the wiper resistance
for VDD voltages of 5.5, 3.0, 1.8 Volts. These graphs
show that as the resistor ladder wiper node voltage
(VWCn) approaches the VDD/2 voltage, the wiper
resistance increases. These graphs also show the
different resistance characteristics of the NMOS and
PMOS transistors that make up the wiper switch. This
is demonstrated by the wiper code resistance curve,
which does not mirror itself around the mid-scale code
(wiper code = 128).
So why are the RW graphs showing the maximum
resistance at about mid-scale (wiper code = 128) and
the RBW graphs showing the issue at code 160?
This requires understanding low-voltage transistor
characteristics as well as how the data was measured.
FIGURE B-3:
Wiper Resistance (RW) vs.
Wiper Code and Temperature
(VDD = 5.5V, IW = 900 A; VDD = 3.0V,
IW = 480 A).
FIGURE B-4:
Wiper Resistance (RW) vs.
Wiper Code and Temperature
(VDD = 1.8V, IW = 260 A).
The method in which the data was collected is
important to understand. Figure B-5 shows the
technique that was used to measure the RBW and RW
resistance. In this technique, Terminal A is floating and
Terminal B is connected to ground. A fixed current is
then forced into the wiper (IW) and the corresponding
wiper voltage (VW) is measured. Forcing a known
current through RBW (IW) and then measuring the
voltage difference between the wiper (VW) and
Terminal A (VA), the wiper resistance (RW) can be
calculated, see Figure B-5. Changes in IW current will
change the wiper voltage (VW). This may affect the
device’s wiper resistance (RW).
FIGURE B-5:
RBW and RW Measurement.
Figure B-6 shows a block diagram of the resistor
network where the RAB resistor is a series of 256 RS
resistors. These resistors are polysilicon devices. Each
wiper switch is an analog switch made up of an NMOS
and PMOS transistor. A more detailed figure of the
wiper switch is shown in Figure B-7. The wiper
resistance is influenced by the voltage on the wiper
switches nodes (VG, VW and VWCn). Temperature also
influences the characteristics of the wiper switch, see
Figure B-4.
The NMOS transistor and PMOS transistor have
different characteristics. These characteristics, as well
as the wiper switch node voltages, determine the RW
resistance at each wiper code. The variation of each
wiper switch’s characteristics in the resistor network is
greater then the variation of the RS resistors.
The voltage on the resistor network node (VWCn) is
dependent upon the wiper code selected and the
voltages applied to VA, VB and VW. The wiper switch VG
voltage to VW or VWCn voltage determines how strongly
the transistor is turned on. When the transistor is
weakly turned on, the wiper resistance RW will be high.
When the transistor is strongly turned on, the wiper
resistance (RW) will be in the typical range.
20
40
60
80
100
120
140
160
180
200
220
0
64
128
192
256
Wiper Code
Resistance
()
-40C @ 3.0V
+25C @ 3.0V
+85C @ 3.0V
+125C @ 3.0V
-40C @5.5V
+25C @ 5.5V
+85C @ 5.5V
+125C @ 5.5V
20
520
1020
1520
2020
0
64
128
192
256
Wiper Code
Resistance
()
-40C @ 1.8V
+25C @ 1.8V
+85C @ 1.8V
+125C @ 1.8V
A
B
W
IW
VW
floating
RBW = VW/IW
VA
VB
RW = (VW-VA)/IW
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相关代理商/技术参数
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MCP4461T-104E/ML 功能描述:数字电位计 IC 100k I2C Qd Ch 8bit Nonvolatile memory RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MCP4461T-104E/ST 功能描述:数字电位计 IC 100k I2C Qd Ch 8bit Nonvolatile memory RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MCP4461T-502E/ML 功能描述:数字电位计 IC 5k I2C Qd Ch 8bit Nonvolatile memory RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MCP4461T-502E/ST 功能描述:数字电位计 IC 5k I2C Qd Ch 8bit Nonvolatile memory RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
MCP4461T-503E/ML 功能描述:数字电位计 IC 50k I2C Qd Ch 8bit Nonvolatile memory RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
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