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MC1490P bảng dữ liệu(PDF) 7 Page - LANSDALE Semiconductor Inc.

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Giải thích chi tiết về linh kiện  RF/IF/Audio Amplifier Wideband Amplifier With AGC
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nhà sản xuất  LANSDALE [LANSDALE Semiconductor Inc.]
Trang chủ  http://www.lansdale.com
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Page 7 of 8
Issue A
LANSDALE Semiconductor, Inc.
ML1490
DESCRIPTION OF SPEECH COMPRESSOR
The amplifier drives the base of a PNP transistor operating
common–emitter with a voltage gain of approximately 20. The
control R1 varies the quiescent Q point of this transistor so
that varying amounts of signal exceed the level Vr. Diode D1
rectifies the positive peaks of Q1's output only when these
peaks are greater than Vr ≈ 7.0 V. The resulting output is fil-
tered by Cx, Rx.
Rx controls the charging time constant or attack time. Cx is
involved in both charge and discharge. R2 (the 150 k
Ω and
input resistance of the emitter–follower Q2) controls the decay
time. Making the decay long and attack short is accomplished
by making Rx small and R2 large. (A Darlington emitter–fol-
lower may be needed if extremely slow decay times are
required.)
The emitter–follower Q2 drives the AGC Pin 5 of the
ML1490PP and reduces the gain. R3 controls the slope of sig-
nal compression.
Table 1. Distortion versus Frequency
Frequency
Distortion
Distortion
Frequency
10 mV ei
100 mV ei
10 mV ei
100 mV ei
100 Hz
3.5%
12%
15%
27%
300 Hz
2%
10%
6%
20%
1.0 kHz
1.5%
8%
3%
9%
10 kHz
1.5%
8%
1%
3%
100 kHz
1.5%
8%
1%
3%
Notes 1 and 2
Notes 3 and 4
Notes:
(1)
Decay = 300 ms
(3)
Decay = 20 ms
Attack = 20 ms
Attack = 3.0 ms
(2)
Cx = 7.5 µF
(4)
Cx = 0.68 µF
Rx = 0 (Short)
Rx = 1.5 kΩ
5
Figure 24. Speech Compressor
ML1490
25
µF
0.001
1.0 k
1.0 k
+12 V
2
4
6
1
3
8
10
µF
10
µF
Output
+12 V
+12 V
2.2 k
220
15
µF
Input
15
µF
R3
15 k
Q2
2N3904
+12 V
7
Q1
2N3906
4.7 k
150 k
R2
Cx
Rx
D1
6.8 k
R1
100 k
33 k
Vr


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