参数资料
| 型号： | MCP42050-E/P |
| 厂商： | Microchip Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL 50K 2CH SPI 14DIP |
| 标准包装： | 30 |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 2 |
| 温度系数： | 标准值 800 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 3 线串行（芯片选择） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-PDIP |
| 包装： | 管件 |
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MCP41XXX/42XXX
DS11195C-page 16
2003 Microchip Technology Inc.
FIGURE 4-7:
Single Supply
programmable differential amplifier using digital
potentiometers.
4.2.3
PROGRAMMABLE OFFSET TRIM
For applications requiring only a programmable voltage
reference, the circuit in Figure 4-8 can be used. This
circuit shows the device used in the potentiometer
mode along with two resistors and a buffered output.
This creates a circuit with a linear relationship between
voltage-out and programmed code. Resistors R1 and
R2 can be used to increase or decrease the output volt-
age step size. The potentiometer in this mode is stable
over temperature. The operation of this circuit over
temperature is shown in Figure 2-3. The worst perfor-
mance over temperature will occur at the lower codes
due to the dominating wiper resistance. R1 and R2 can
also be used to affect the boundary voltages, thereby
eliminating the use of these lower codes.
FIGURE 4-8:
By changing the values of
R1 and R2, the voltage output resolution of this
programmable voltage reference circuit is
affected.
4.3
Calculating Resistances
When programming the digital potentiometer settings,
the following equations can be used to calculate the
resistances. Programming code 00h effectively brings
the wiper to the B terminal, leaving only the wiper resis-
tance. Programming higher codes will bring the wiper
closer to the A terminal of the potentiometer. The equa-
tions in Figure 4-9 can be used to calculate the terminal
resistances. Figure 4-10 shows an example calculation
using a 10 k
potentiometer.
FIGURE 4-9:
Potentiometer resistances
are a function of code. It should be noted that,
when using these equations for most feedback
amplifier circuits (see Figure 4-4 and Figure 4-5),
the wiper resistance can be omitted due to the
high impedance input of the amplifier.
FIGURE 4-10:
Example Resistance
calculations.
MCP601
VB
VSS
VDD
-IN
+IN
VOUT
AB
A
B
(SIG -)
MCP42010
1/2
VREF
NOTE: Potentiometer values must be equal
+
-
Where:
RA
RAB 256 Dn
–
()
256
---------------------------------------
=
RB
RABDn
256
------------------
=
RAB
Total Resistance of pot
=
Dn
Wiper setting forDn 0 to 255
=
VOUT
VA VB
–
()
RB
RA
-------
=
VA
(SIG +)
MCP606
OUT
VSS
VDD
-IN
+IN
VDD
VSS
R1
R2
B
A
MCP41
010
0.1 uF
+
-
PA
PB
PW
Where:
PA is the A terminal
PB is the B terminal
PW is the wiper terminal
RWA is resistance between Terminal A and wiper
RWB is resistance between Terminal B and Wiper
RAB is overall resistance for pot (10 k, 50 k or 100 k)
RW is wiper resistance
Dn is 8-bit value in data register for pot number n
RWA Dn
()
RAB
() 256 Dn
–
()
256
-------------------------------------------- RW
+
=
RWB Dn
()
RAB
() Dn
()
256
---------------------------- RW
+
=
Example:
Code = C0h = 192d
R = 10 k
Note: All values shown are typical and
actual results will vary.
PA
PB
PW
10 k
RWA Dn
()
RAB
() 256 Dn
–
()
256
-------------------------------------------- RW
+
=
RWB C0h
()
10k
() 192
()
256
----------------------------------- 52
+
=
RWA C0h
()
10k
() 256 192
–
()
256
--------------------------------------------------- 52
+
=
RWA C0h
()
2552
=
RWB Dn
()
RAB
() Dn
()
256
---------------------------- RW
+
=
RWB C0h
()
7552
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP42050-I/P | 功能描述:数字电位计 IC 256 Step SPI 50kOhm 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 |
| MCP42050-I/P | 制造商:Microchip Technology Inc 功能描述:Digital Potentiometer (Pots) IC |
| MCP42050-I/SL | 功能描述:数字电位计 IC 256 Step SPI 50kOhm 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 |
| MCP42050-I/ST | 功能描述:数字电位计 IC 256 Step SPI 50kOhm 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 |
| MCP42050T-E/SL | 功能描述:数字电位计 IC 256 Step SPI 50kOhm 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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