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參數(shù)資料
| 型號： | MC33077 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low Noise Dual Operational Amplifier(低噪聲四運放) |
| 中文描述： | 低噪聲雙運算放大器（低噪聲四運放） |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 175K |
| 代理商： | MC33077 |
MC33077
http://onsemi.com
12
amplifier’s input capacitance, creating a pole near the closed
loop corner frequency, lead capacitor compensation
techniques (lead capacitor in parallel with the feedback
resistor) can be employed to improve stability. The feedback
resistor and lead capacitor RC time constant should be larger
than that of the uncompensated input pole frequency. Having
a high resistance connected to the noninverting input of the
amplifier can create a like instability problem. Compensation
for this condition can be accomplished by adding a lead
capacitor in parallel with the noninverting input resistor of
such a value as to make the RC time constant larger than the
RC time constant of the uncompensated input resistor acting
in conjunction with the amplifiers input capacitance.
For optimum frequency performance and stability, careful
component placement and printed circuit board layout
should be exercised. For example, long unshielded input or
output leads may result in unwanted input output coupling.
In order to reduce the input capacitance, the body of resistors
connected to the input pins should be physically close to the
input pins. This not only minimizes the input pole creation
for optimum frequency response, but also minimizes
extraneous signal “pickup” at this node. Power supplies
should be decoupled with adequate capacitance as close as
possible to the device supply pin.
In addition to amplifier stability considerations, input
source resistance values should be low to take full advantage
of the low noise characteristics of the amplifier. Thermal
noise (Johnson Noise) of a resistor is generated by
thermallycharged carriers randomly moving within the
resistor creating a voltage. The RMS thermal noise voltage
in a resistor can be calculated from:
E
nr
=
4k TR
×
BW
/
where:
k = Boltzmann’s Constant (1.38
×
10
23
joules/k)
T = Kelvin temperature
R = Resistance in ohms
BW = Upper and lower frequency limit in Hertz.
By way of reference, a 1.0 k resistor at 25
°
C will
produce a 4.0
nV/ Hz
of RMS noise voltage. If this resistor
is connected to the input of the amplifier, the noise voltage
will be gainedup in accordance to the amplifier’s gain
configuration. For this reason, the selection of input source
resistance for low noise circuit applications warrants serious
consideration. The total noise of the amplifier, as referred to
its inputs, is typically only 4.4
nV/ Hz
The output of any one amplifier is current limited and thus
protected from a direct short to ground, However, under such
conditions, it is important not to allow the amplifier to exceed
the maximum junction temperature rating. Typically for
±
15 V supplies, any one output can be shorted continuously
to ground without exceeding the temperature rating.
at 1.0 kHz.
Figure 37. Voltage Noise Test Circuit
(0.1 Hz to 10 Hz
pp
)
Note: All capacitors are nonpolarized.
+
0.1 F
10
100 k
2.0 k
4.7 F
Voltage Gain = 50,000
Scope
×
1
R
in
= 1.0 M
1/2
MC33077
+
D.U.T.
100 k
0.1 F
2.2 F
22 F
24.3 k
4.3 k
110 k
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| MC33078 | Low Noise Dual/Quad Operational Amplifiers(低噪雙運放) |
| MC33079 | Low Noise Dual/Quad Operational Amplifiers(低噪聲四運放) |
| MC33079DG | Low Noise Dual/Quad Operational Amplifiers |
| MC33078DG | Low Noise Dual/Quad Operational Amplifiers |
| MC33078DR2 | Low Noise Dual/Quad Operational Amplifiers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC33077_04 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Low Noise Dual Operational Amplifier |
| MC33077D | 功能描述:運算放大器 - 運放 Dual 11V/us Low 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MC33077DG | 功能描述:運算放大器 - 運放 Dual 11V/us Low Noise Ind. Temp 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MC33077DR2 | 功能描述:運算放大器 - 運放 Dual 11V/us Low 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MC33077DR2G | 功能描述:運算放大器 - 運放 Dual 11V/us Low Noise Ind. Temp 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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