参数资料
| 型号： | MCP4011T-503E/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 40/54页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 50K 1CH 8MSOP |
| 标准包装： | 2,500 |
| 接片： | 64 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 150 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 2 线串行（芯片选择，增/减） |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
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2006 Microchip Technology Inc.
DS21978C-page 45
MCP4011/2/3/4
8.2
Operational Amplifier
Applications
Figure 8-3, Figure 8-4 and Figure 8-5 illustrate typical
amplifier circuits that could replace fixed resistors with
the MCP4011/2/3/4 to achieve digitally-adjustable
analog solutions.
Figure 8-4 shows a circuit that allows a non-inverting
amplifier to have its’ offset and gain to be independently
trimmed. The MCP4011 is used along with resistors R1
and R2 to set the offset voltage. The sum of R1 + R2
resistance should be significantly greater (> 100 times)
the resistance value of the MCP4011. This allows each
increment or decrement in the MCP4011 to be a fine
adjustment of the offset voltage. The input voltage of
the op amp (V
IN) should be centered at the op amps V
w
voltage. The gain is adjusted by the MCP4012. If the
resistance value of the MCP4012 is small compared to
the resistance value of R3, then this is a fine adjustment
of the gain. If the resistance value of the MCP4012 is
equal (or large) compared to the resistance value of R3,
then this is a course adjustment of the gain. In general,
trim the course adjustments first and then trim the fine
adjustments.
FIGURE 8-3:
Trimming Offset and Gain in
an Inverting Amplifier.
FIGURE 8-4:
Trimming Offset and Gain in
a Non-Inverting Amplifier.
FIGURE 8-5:
Programmable Filter.
Op Amp
VIN
VOUT
B
A
W
+
–
MCP4011
R1
R2
B
A
VDD
W
R3
R4
MCP401
1
MCP6001
Op Amp
VIN
VOUT
–
+
R1
R2
B
A
VDD
W
R3
MCP6291
MCP401
1
MCP4012
AW
V
W
V
DD
Op Amp
VIN
VOUT
B
A
W
+
–
MCP4011
R1
R2
B
A
VDD
W
MCP4011
R3
R4
fc
1
2
π R
Eq C
-----------------------------
=
Pot1
Pot2
REq
R1 RAB RWB
–
+
()
R2 RWB
+
() R
w
+
||
=
Thevenin
Equivalent
MCP6021
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