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參數(shù)資料
| 型號： | LD502MINI |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 159K |
| 代理商： | LD502MINI |
Patented 1985 Patent Pending Europe 83.300836.0
Canada 1183580 USA 4506169 Japan 58-06886
BLOCK DIAGRAM
Low Distortion AGC
Compression Amplifier
LD502 DATA SHEET
adjustable gain from 0 to 60 dB
0.94 V DC voltage regulator on-chip
attack time fixed at less than 1 ms
release time adjustable from 40 to 500 ms
low input referred noise 1.2
μ
V
<1 % distortion at 10 mV
RMS
output
operates from 1.05 to 3 V
DC
STANDARD PACKAGING
8 pin MICROpac
8 pin MINIpac
8 pin PLID
8 pin SLT
Au Bump
FEATURES
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Japan Branch: A-302, Miyamae Village, 2–10–42 Mi yamae, Suginami–ku, Tokyo 168, Japan tel. (03) 3334-7700 fax (03) 3247-8839
DESCRIPTION
The LD502 is a compression (AGC) preamplifier that consists
of a single ended input inverting amplifier, with an internal
current controlled resistance connected between input and
output.
By using R
GT
(see test circuit) to vary the value of this current
controlled resistance, the amplifier gain and compression
threshold can be controlled over a range of 60 dB.
The AGC current is derived from a full wave rectifier driven by
a differential amplifier. The attack time of the AGC circuit is
fixed at less than 1 ms. The release time is adjustable from
40 to 500 ms by selecting the value of an external capacitor
(C3).
Internally, a series shunt voltage regulator produces a 0.94 V
DC regulated output voltage. This provides a bias for electret
microphones and permits circuit operations over a wide range
of supply voltages, 1.05 to 3 V
DC
for LD502 without any
degradation of electrical performances.
Revision Date: March 1994
GAIN SET
A OUT
AGC IN
AGC FILTER
GND
A IN
V
REG
V
B
VOLTAGE
REGULATOR
AMPLIFIER
FULL WAVE
RECTIFIER
8
5
6
3
4
7
2
1
Document No. 500 - 43 - 18
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