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參數(shù)資料
| 型號(hào)： | LMC6462AIM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Micropower, Rail-to-Rail Input and Output CMOS Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 2000 uV OFFSET-MAX, 0.05 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 10/18頁(yè) |
| 文件大?。?/td> | 648K |
| 代理商： | LMC6462AIM |
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Application Information
(Continued)
2.0 Rail-to-Rail Output
The approximated output resistance of the LMC6462/4 is
180
sourcing, and 130
sinking at V
= 3V, and 110
sourcing and 83
sinking at V
= 5V. The maximum output
swing can be estimated as a function of load using the calcu-
lated output resistance.
3.0 Capacitive Load Tolerance
The LMC6462/4 can typically drive a 200 pF load with V
=
5V at unity gain without oscillating. The unity gain follower is
the most sensitive configuration to capacitive load. Direct ca-
pacitive loading reduces the phase margin of op-amps. The
combination of the op-amp’s output impedance and the ca-
pacitive load induces phase lag. This results in either an un-
derdamped pulse response or oscillation.
Capacitive load compensation can be accomplished using
resistive isolation as shown in Figure 4 If there is a resistive
component of the load in parallel to the capacitive compo-
nent, the isolation resistor and the resistive load create a
voltage divider at the output. This introduces a DC error at
the output.
Figure 5 displays the pulse response of the LMC6462/4 cir-
cuit in Figure 4
Another circuit, shown in Figure 6 is also used to indirectly
drive capacitive loads. This circuit is an improvement to the
circuit shown in Figure 4because it provides DC accuracy as
well as AC stability. R1 and C1 serve to counteract the loss
of phase margin by feeding the high frequency component of
the output signal back to the amplifiers inverting input,
thereby preserving phase margin in the overall feedback
loop. The values of R1 and C1 should be experimentally de-
termined by the system designer for the desired pulse re-
sponse. Increased capacitive drive is possible by increasing
the value of the capacitor in the feedback loop.
The pulse response of the circuit shown in Figure 6is shown
in Figure 7
4.0 Compensating for Input Capacitance
It is quite common to use large values of feedback resis-
tance with amplifiers that have ultra-low input current, like
the LMC6462/4. Large feedback resistors can react with
small values of input capacitance due to transducers, photo-
diodes, and circuits board parasitics to reduce phase
margins.
DS012051-7
FIGURE 3. Input Current Protection for Voltages
Exceeding the Supply Voltage
DS012051-8
FIGURE 4. Resistive Isolation of
a 300 pF Capacitive Load
DS012051-9
FIGURE 5. Pulse Response of the LMC6462
Circuit Shown in
Figure 4
DS012051-10
FIGURE 6. LMC6462 Non-Inverting Amplifier,
Compensated to Handle a 300 pF Capacitive
and 100 k
Resistive Load
DS012051-11
FIGURE 7. Pulse Response of
LMC6462 Circuit in
Figure 6
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6462AIM | 制造商:Texas Instruments 功能描述:OP AMP DUAL MICROPOWER SMD 6462 |
| LMC6462AIM/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 DUAL MICROPOWER RRIO CMOS OP AMP 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 |
| LMC6462AIM/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMC6462AIMX | 功能描述:運(yùn)算放大器 - 運(yùn)放 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 |
| LMC6462AIMX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 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 |
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