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參數(shù)資料
| 型號(hào)： | OPA37 |
| 英文描述： | Ultra-Low Noise Precision OPERATIONAL AMPLIFIERS |
| 中文描述： | 超低噪聲精密運(yùn)算放大器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 216K |
| 代理商： | OPA37 |
9
OPA27, 37
COMPENSATION
Although internally compensated for unity-gain stability, the
OPA27 may require a small capacitor in parallel with a
feedback resistor (R
F
) which is greater than 2k
. This
capacitor will compensate the pole generated by R
F
and C
IN
and eliminate peaking or oscillation.
INPUT PROTECTION
Back-to-back diodes are used for input protection on the
OPA27/37. Exceeding a few hundred millivolts differential
input signal will cause current to flow and without external
current limiting resistors the input will be destroyed.
Accidental static discharge as well as high current can
damage the amplifier’s input circuit. Although the unit may
still be functional, important parameters such as input offset
voltage, drift, and noise may be permanently damaged as will
any precision operational amplifier subjected to this abuse.
Transient conditions can cause feedthrough due to the
amplifier’s finite slew rate. When using the OP-27 as a unity-
gain buffer (follower) a feedback resistor of 1k
is recom-
mended (see Figure 6).
NOISE: BIPOLAR VERSUS FET
Low-noise circuit design requires careful analysis of all noise
sources. External noise sources can dominate in many cases,
so consider the effect of source resistance on overall opera-
tional amplifier noise performance. At low source imped-
ances, the lower voltage noise of a bipolar operational
amplifier is superior, but at higher impedances the high
current noise of a bipolar amplifier becomes a serious liabil-
ity. Above about 15k
the Burr-Brown OPA111 low-noise
FET operational amplifier is recommended for lower total
noise than the OPA27 (see Figure 5).
FIGURE 3. Offset Voltage Trim.
FIGURE 5. Voltage Noise Spectral Density Versus Source
Resistance.
FIGURE 6. Pulsed Operation.
FIGURE 8. Unity-Gain Inverting Amplifier.
OPA27
Output
Input
1k
1k
2
3
6
FIGURE 7. Low-Noise RIAA Preamplifier.
OPA37
Output
97.6k
G
≈
40dB at 1kHz.
Metal film resistors.
Film capacitors.
R
and C
per cartridge
manufacturer’s
recommendations.
100
2
3
6
0.03μF
0.01μF
7.87k
1μF
20k
R
L
Moving
Magnet
Cartridge
C
L
1
2
3
4
6
±4mV Typical Trim Range
NOTE: (1) 10k
to 1M
Trim Potentiometer
(10k
Recommended).
+V
CC
–V
CC
OPA27/37
7
8
(1)
FIGURE 4. High Resolution Offset Voltage Trim.
1
2
3
4
6
±280μV Typical Trim Range
NOTE: (1) 1k
Trim Potentiometer.
+V
CC
–V
CC
OPA27/37
7
8
4.7k
4.7k
(1)
OPA27
Output
1.9V/μs
R
F
≈
1k
Input
–
+
100
1k
10k
100k
1M
10M
1k
100
10
1
V
O
T
√
H
OPA111 + Resistor
OPA27 + Resistor
Source Resistance, R
S
(
)
E
O
R
S
E
O
=
√
e
n2
+ (i
n
R
S
)
2
+ 4kTR
S
F
O
= 1kHz
Resistor Noise Only
OPA27 + Resistor
OPA111 + Resistor
Resistor Noise Only
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| OPA373AIDBVRG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 6.5MHz 585uA Rail-2-Rail I/O CMOS 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 |
| OPA373AIDBVT | 功能描述:運(yùn)算放大器 - 運(yùn)放 6.5MHz 585uA Rail-2-Rail I/O CMOS 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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