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596288565013A Datasheet(PDF) 14 Page - Analog Devices

Part # 596288565013A
Description  Very Low Noise Quad Operational Amplifier
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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REV. B
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
VOUT – –5VIN
R2
10k
2N5434
R5
100k
VIN
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
10 F
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 V rms
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
VOUT
R4
1k
60Hz
R2
3.3k
1/4
OP470E
VIN
C1
0.47 F
C2
6.8 F
TANTALUM
L1
1H
R3
680
+
R4
1k
200Hz
C3
1 F
TANTALUM
L2
1H
R5
680
+
R4
1k
800Hz
C4
0.22 F
TANTALUM
L3
1H
R7
680
+
R4
1k
3kHz
C5
0.047 F
TANTALUM
L4
1H
R9
680
+
R4
1k
10kHz
C6
0.022 F
TANTALUM
L5
1H
R11
680
Figure 18. Five-Band Low Noise Graphic Equalizer


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