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參數(shù)資料
| 型號： | MCP6142 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 600 nA, Non-Unity Gain Rail-to-Rail Input/Output Op Amps |
| 中文描述： | 600 nA的，非統(tǒng)一增益軌到軌輸入/輸出運算放大器 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 624K |
| 代理商： | MCP6142 |
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2002 Microchip Technology Inc.
21668A-page 13
MCP6141/2/3/4
3.8.3
SIGNAL COUPLING
The input pins of the MCP6141/2/3/4 family of op amps
are high impedance, which allows noise injection. This
noise can be capacitively or magnetically coupled. In
either case, using a ground plane helps reduce noise
injection.
When noise is coupled capacitively, the ground plane
provides shunt capacitance to ground for high fre-
quency signals (Figure 3-8 shows the equivalent cir-
cuit). The coupled current, I
M
, produces a lower voltage
(V
TRACE 2
) on the victim trace when the trace to ground
plane capacitance (C
SH2
) is large and the terminating
resistor (R
T2
) is small. Increasing the distance between
traces and using wider traces also helps.
FIGURE 3-8:
capacitive coupling between traces on a PC
board (with ground plane).
Equivalent circuit for
When noise is coupled magnetically, the ground plane
reduces the mutual inductance between traces. This
occurs because the ground return current at high fre-
quencies will follow a path directly beneath the signal
trace. Increasing the separation between traces makes
a significant difference. Changing the direction of one
of the traces can also reduce magnetic coupling.
If these techniques are not enough, it may help to place
guard traces next to the victim trace. They should be on
both sides of the victim trace and be as close as possi-
ble. Connect the guard traces to ground plane at both
ends and in the middle for long traces.
3.9
Typical Applications
3.9.1
BATTERY CURRENT SENSING
The MCP6141/2/3/4 op amps’ Common Mode Input
Range, which goes 300 mV beyond both supply rails,
supports their use in high side and low side battery
current sensing applications. The very low quiescent
current (0.6 μA, typ.) help prolong battery life, while the
rail-to-rail output allows you to detect low currents.
Figure 3-9 shows a high side battery current sensor cir-
cuit. The feedback and input resistors are sized to min-
imize power losses. The battery current (I
DD
) through
the 1 k
resistor causes its top terminal to be more
negative than the bottom terminal. This keeps the com-
mon mode input voltage of the op amp
≤
V
DD
, which is
within its allowed range. The output of the op amp can
reach V
DD
- 0.1 mV (see Figure 2-26), which is a
smaller error than the offset voltage.
FIGURE 3-9:
Sensor.
High Side Battery Current
3.9.2
SUMMING AMPLIFIER
The rail-to-rail input and output, the 600 nA (typ.) qui-
escent current and the wide bandwidth make the
MCP6141/2/3/4 family of operational amplifiers fit well
in a summing amplifier circuit, as shown in Figure 3-10.
FIGURE 3-10:
Summing amplifier circuit.
V
TRACE 1
R
T2
C
M
C
SH2
C
SH1
V
TRACE 2
I
M
V
DD
1k
MCP614X
100 k
1 M
V
DD
I
DD
+1.4 V
to
5.5 V
V
SS
V
REF
MCP614X
R
3
R
F
V
3
V
2
V
1
V
OUT
R
2
R
1
I
1
I
2
I
3
I
F
-
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP6142-E/MS | 功能描述:運算放大器 - 運放 G>10 Dl 1.6V 100kHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MCP6142-E/P | 功能描述:運算放大器 - 運放 G>10 Dl 1.6V 100kHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MCP6142-E/SN | 功能描述:運算放大器 - 運放 G>10 Dl 1.6V 100kHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MCP6142-I/MS | 功能描述:運算放大器 - 運放 G>10 Dl 1.6V 100kHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MCP6142-I/P | 功能描述:運算放大器 - 運放 G>10 Dl 1.6V 100kHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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