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| 型號(hào)： | MCP6142-E/MS |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | DUAL OP-AMP, 3000 uV OFFSET-MAX, 0.1 MHz BAND WIDTH, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 9/38頁(yè) |
| 文件大?。?/td> | 633K |
| 代理商： | MCP6142-E/MS |
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2009 Microchip Technology Inc.
DS21668D-page 17
MCP6141/2/3/4
Figure 4-5 shows three example circuits that are
unstable when used with the MCP6141/2/3/4 family.
The unity gain buffer and low gain amplifier
(non-inverting or inverting) are at gains that are too low
for stability (see Equation 4-2).The Miller integrator’s
capacitor makes it reach unity gain at high frequencies,
causing instability.
FIGURE 4-5:
Examples of Unstable
Circuits for the MCP6141/2/3/4 Family.
4.4.2
CAPACITIVE LOADS
Driving large capacitive loads can cause stability
problems for voltage feedback op amps. As the load
capacitance increases, the feedback loop’s phase
margin decreases and the closed-loop bandwidth is
reduced. This produces gain peaking in the frequency
response, with overshoot and ringing in the step
response. A unity gain buffer (G = +1) is the most
sensitive to capacitive loads, though all gains show the
same general behavior.
When driving large capacitive loads with these op
amps (e.g., > 60 pF when G = +10), a small series
feedback loop’s phase margin (stability) by making the
output load resistive at higher frequencies. The
bandwidth will be generally lower than the bandwidth
with no capacitive load.
FIGURE 4-6:
Output Resistor, RISO
stabilizes large capacitive loads.
different capacitive loads and gains. The x-axis is the
normalized load capacitance (CL/GN), where GN is the
circuit’s noise gain. For non-inverting gains, GN and the
Signal Gain are equal. For inverting gains, GN is
1 + |Signal Gain| (e.g., -9 V/V gives GN = +10 V/V).
FIGURE 4-7:
Recommended RISO Values
for Capacitive Loads.
After selecting RISO for your circuit, double check the
resulting frequency response peaking and step
response overshoot. Modify R’s value until the
response is reasonable. Bench evaluation and
simulations with the MCP6141/2/3/4 SPICE macro
model are helpful.
4.5
MCP6143 Chip Select
The MCP6143 is a single op amp with Chip Select
(CS). When CS is pulled high, the supply current drops
to 50 nA (typical) and flows through the CS pin to VSS.
When this happens, the amplifier output is put into a
high impedance state. By pulling CS low, the amplifier
is enabled. If the CS pin is left floating, the amplifier will
not operate properly. Figure 1-1 shows the output
voltage and supply current response to a CS pulse.
Note:
The three circuits shown in Figure 4-5 are
not
to be used with the MCP6141/2/3/4 op
amps. They are included for illustrative
purposes only.
Low Gain Amplifier
MCP614X
VOUT
RG
V1
RF
RN
1
R
F
R
G
-------
10
<
+
V2
MCP614X
VOUT
VIN
MCP614X
VOUT
C
R
VIN
Unity Gain Buffer
Miller Integrator
VB
MCP614X
RISO
VOUT
CL
RF
RG
VA
1,000
10,000
100,000
1.E+00
1.E+01
1.E+02
1.E+03
Normalized Load Capacitance; CL/GN (F)
Recommended
R
IS
O
(
)
1p
1k
100k
10p
GN = +10
GN = +20
GN ≥ +50
10k
1n
100p
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP6142-I/MS | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(yùn)算放大器 - 運(yùn)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(bǔ)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 | 制造商:Microchip Technology Inc 功能描述:IC OP-AMP DUAL LOW-POWER RRI/O |
| MCP6142-I/SN | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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/SN | 制造商:Microchip Technology Inc 功能描述:Operational Amplifier (Op-Amp) IC |
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