LP502 Datasheet PDF - Gennum Corporation


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LP502
Gennum Corporation

Part Number LP502
Description Low Distortion AGC Compression Amplifier
Page 4 Pages

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Low Distortion AGC
Compression Amplifier
LP502 CUSTOM DATA SHEET
FEATURES
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 µV
<1 % distortion at 10 mVRMS output
operates from 1.05 to 3 VDC
STANDARD PACKAGING
• 8 pin MICROpac
• 8 pin PLID ®
• Chip (64 x 62 mils)
Au Bump
DESCRIPTION
The LP502 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.
VB
7
By using RGT (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 VDC for LP502 without any
degradation of electrical performances.
As compared to the LD502, the LP502 incorporates an
additional diode between the amplifier output and the AGC
filter point. This “attack diode” is responsible for precharging
the AGC filter point, which enables quicker attack time and
helps to reduce the gain overshoot (during transients) that is
observed in the LD502 with certain combinations of AGC input
coupling and filter capacitors. However, with this diode
connected, some level of AGC is always present with higher
output levels even when the AGC input is disconnected.
Therefore the LP502 cannot be used as a “pure” linear
amplifier.
GAIN SET
4
2
VREG
VOLTAGE
REGULATOR
1
A IN
AMPLIFIER
A OUT
3
FULL WAVE
RECTIFIER
AGC IN
6
85
GND
AGC FILTER
BLOCK DIAGRAM
Patented 1985
Canada 1183580
Patent Pending Europe 83.300836.0
USA 4506169
Japan 58-06886
Document No. HP2802-1
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Gennum Japan Corporation:C-101 Mi yamae Vill age, 2–10–42 Mi yamae, Suginami–ku, Tokyo 168-0081, Japan tel. (03) 3334-7700 fax (03) 3247-8839



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ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
CAUTION
CLASS 1 ESD SENSITIVITY
VALUE/UNITS
3 V DC
25 mW
-10°C to 50° C
-20°C to 70° C
PIN CONNECTION
GAIN SET
A OUT
VREG
A IN
4
1
5 AGC FILTER
AGC IN
VB
8 GND
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage VB = 1.3 VDC
PARAMETER
Gain
SYMBOL
AV
CONDITIONS
VOUT = 11.0 mV,
20 Log ( VOUT )
VIN
MIN
38
Output Level
Distortion -Linear
- AGC
Input Referred Noise
Compression Function Ratio
Total Amplifier Current
Regulated Voltage
Supply Rejection
VOHIGH
THD
IRN
IAMP
VREG
PSRR
VIN = 6.32 mV, S1 closed
7.5
VOUT = 11.0 mV
VIN = 6.32mV, S1 closed
-
-
S2 closed,NFB 0.2 to 10 kHz at 12 dB/Oct
-
VIN = 0.1 to 6.32 mV, S1 closed
2
160
0.890
51
All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column
RGT
130k
ITOT
TYP
41
MAX
46
UNITS
dB
12
1
1
1.2
5
310
0.940
60
15.5
2.9
2.2
2.2
8
380
0.990
-
mV
%
%
µV
dB
µA
VDC
dB
VB= 1.3 VDC
74
2
C1
0.47
1
VOLTAGE
REGULATOR
AMP
RS= 3.5k
RM
33K
C2
1.0 VIN
S2
8
FULL WAVE
RECTIFIER
5
C3
1.0
All resistors in ohms, all capacitors in microfarads unless otherwise stated
C5
1.0
3
RTH
VOUT
0
S1 RL
6 10K
C4
0.1
HP2802-1
Fig. 1 Test Circuit
2



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GAIN TRIM
500k
7 LP502
VOLTAGE
4.7 2 REGULATOR
4
0.1
1
RS 3.9k
AMP
FULL WAVE
RECTIFIER
VC =10k
0.1
3
0.1
6
85
0.1-1.0
All resistors in ohms, all capacitors in microfarads unless otherwise stated
4.7
1
4.7
4 LC549 6
2
5
8
VB=1.3 VDC
RL=400
TYP
37
NC
0.047
Fig. 2 LP502/LC549Hearing Instrument Application
GAIN TRIM
500k
7 LP502
VOLTAGE
4.7 2 REGULATOR
4
0.1
1
RS 3.9k
8
AMP
3
FULL WAVE
RECTIFIER
6
5
LE507
2
0.1
33k
5
0.1
0.1
VC
10k
25k
2k
4
18k
All resistors in ohms, all capacitors in
microfarads unless otherwise stated
0.47
8
13.5k
3
VB=1.3 VDC
1 BK1606
7 Z=1k
6
RE=33
Fig. 3 LP502/LE507 Hearing Instrument Application
3 HP2802-1



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100
RTH=50k
RTH=22k
RTH=10k
10
RTH=0k
100
10
1
RGT=130k
RGT=82k
RGT=68k
RGT=47k
1
0.01
0.1 1.0
INPUT (mV)
Fig. 4 I/O Characteristics at
Various RTH Values
10
0.1
0.01
0.1 1.0
INPUT (mV)
Fig. 5 I/O Characteristics at
Various RGT Values
10
100
10
VB=3 VDC
RTH=0
VB=1.3 VDC
0.1
0.01
0.1 1.0
INPUT (mV)
Fig. 6 Effects of Supply Voltage
Variation
10
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
20
CS=0.22 µF
CS=0.1 µF
CS=0.047 µF
CS=0.033 µF
200 2K
FREQUENCY (Hz)
Fig. 7 Frequency Response at
Various CS Values
20k
4.0
3.0
2.0
1.0
0.0
0.0
5.0 10.0
15.0
20.0
OUTPUT (mV)
Fig. 8 Total Harmonic Distortion
vs Output Level
25.0
DOCUMENT
IDENTIFICATION
PRODUCT PROPOSAL
This data has been compiled for market investigation purposes
only, and does not constitute an offer for sale.
ADVANCE INFORMATION NOTE
This product is in development phase and specifications are
subject to change without notice. Gennum reserves the right to
remove the product at any time. Listing the product does not
constitute an offer for sale.
PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications are
subject to change without notice.
DATA SHEET
The product is in production. Gennum reserves the right to make
changes at any time to improve reliability, function or design, in
order to provide the best product possible.
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright August 1997 Gennum Corporation. All rights reserved. Printed in Canada.
HP2802-1
4




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