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參數(shù)資料
| 型號(hào)： | OP470EY |
| 廠商： | PRECISION MONOLITHICS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Very Low Noise Quad Operational Amplifier |
| 中文描述： | QUAD OP-AMP, 500 uV OFFSET-MAX, 6 MHz BAND WIDTH, CDIP14 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 687K |
| 代理商： | OP470EY |
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REV. A
OP470
–14–
SQUELCH AMPLIFIER
The circuit of Figure 17 is a simple squelch amplifier that uses a
FET switch to cut off the output when the input signal falls
below a preset limit.
The input signal is sampled by a peak detector with a time
constant set by C1 and R6. When the output of the peak detector
(Vp), falls below the threshold voltage, (VTH), set by R8, the
comparator formed by op amp C switches from V– to V+. This
drives the gate of the N-channel FET high, turning it ON, re-
ducing the gain of the inverting amplifier formed by op amp A
to zero.
1/4
OP470E
A
R1
2k
V
OUT
– –5V
IN
R2
10k
2N5434
R5
100k
V
IN
1/4
OP470E
B
R3
2k
R4
10k
D1
1N4148
C1
1 F
R6
1M
1/4
OP470E
C
R4
10M
D2
1N4148
R7
10k
C2
+
V+
R6
10k
= 1 SECOND
Figure 17. Squelch Amplifier
FIVE-BAND LOW-NOISE STEREO GRAPHIC EQUALIZER
The graphic equalizer circuit shown in Figure 18 provides 15 dB
of boost or cut over a 5-band range. Signal-to-noise ratio over a
20 kHz bandwidth is better than 100 dB referred to a 3 Vrms
input. Larger inductors can be replaced by active inductors but
this reduces the signal-to-noise ratio.
R1
47k
1/4
OP470E
R13
3.3k
R14
100
V
OUT
R4
1k
60Hz
R2
3.3k
1/4
OP470E
V
IN
C1
0.47 F
C2
+
TANTALUM
L1
1H
R3
680
+
R4
1k
200Hz
C3
1 F
TANTALUM
L2
1H
R5
680
R4
1k
800Hz
C4
0+
TANTALUM
L3
1H
R7
680
R4
1k
3kHz
C5
0.+
TANTALUM
L4
1H
R9
680
R4
1k
10kHz
C6
0.+
TANTALUM
L5
1H
R11
680
Figure 18. Five-Band Low Noise Graphic Equalizer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OP470GP | Very Low Noise Quad Operational Amplifier |
| OP470GS | Very Low Noise Quad Operational Amplifier |
| OP482GP | Dual/Quad Low Power, High Speed JFET Operational Amplifiers |
| OP482GS | Dual/Quad Low Power, High Speed JFET Operational Amplifiers |
| OP484 | Precision Rail-to-Rail Input & Output Operational Amplifiers(精密滿幅度輸入輸出運(yùn)放) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-470EY | 制造商:AD 制造商全稱:Analog Devices 功能描述:VERY LOW NOISE QUAD OPERATIONAL AMPLIFIER |
| OP470FY | 制造商:Analog Devices 功能描述: |
| OP-470FY | 制造商:AD 制造商全稱:Analog Devices 功能描述:VERY LOW NOISE QUAD OPERATIONAL AMPLIFIER |
| OP470G | 制造商:Analog Devices 功能描述: |
| OP-470G | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers |
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