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High Power Class B
Output Stage
LC549/LV549/LD549 DATA SHEET
FEATURES
DESCRIPTION
40dB of electrical gain
1.0 to 1.6 VDC supply operating range
current trim capability (RT)
high efficiency class B output stage
may be used with a linear or compression preamplfier
STANDARD PACKAGING
• 8 pin MICROpac (LC549)
• 8 pin MINIpac
• 8 pin PLID® (LC549, LD549)
• Chip (47 x 40 mils) (LC549, LD549)
The LC/LV/LD549 is an 8 pin, low voltage, push-pull audio
frequency output stage amplifier with a single unbalanced
input. The circuit utilizes two internal negative feedback
loops to stabilize the DC operating point for temperature
stability and to linearize the transfer function over a wide
dynamic range. The circuit operates near ideal class B
conditions resulting in low distortion and very low quiescent
current, required for extended battery life.
The LC549, LV549 and LD549 differ in only one respect;
the LV549 and LD549 are selected devices which are
capable of delivering from 10 mA to 41 mA and from 36 mA
to 75 mA of output current respectively. These values are
the maximum current drawn with both output stage transistors
in saturation. Thus the LD549 is capable of producing a
high output in a low impedance load, the LV549 is selected
to have lower peak currents, extending the life of the
battery.
RT VB
36
5
OUTPUT 1
2
INPUT
8
OUTPUT 2
41
DEC 1 DEC 2
7
GND
U.S. Patent No. 4,085,382
Patented in other countries
BLOCK DIAGRAM
Revision Date: January 2001
Document No. 500 - 25 - 09
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 Miyamae, Suginami-ku Tokyo 168, Japan tel. (03) 3334-7700 fax: (03) 3247-8839

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ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power dissipation
Operating Temperature
Storage Temperature
VALUE & UNITS
3 VDC
60 mW
-10 to + 40 °C
-20 to + 70 °C
CAUTION
CLASS 1 ESD SENSITIVITY
PIN CONNECTION
DEC1
RT
I/P
DEC2
4
1
5 OUT1
VB
GND
8 OUT2
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25 oC, Supply Voltage VB = 1.3 VDC
PARAMETER
SYMBOL
CONDITION
MIN
Gain
Quiescent Current
Maximum Drive Current
Input Impedance
ACL
IAMP
ITRANS
ITOT
VOUT = 0.707 VRMS
V1 = 0V (S2, S3 closed)
V4 = 0V LC549
LV549
LD549
38
100
170
-
10
10
36
18
Total Harmonic Distortion & Noise
THD
Input Referred Noise
IRN
VOUT = 0.707 VRMS
VOUT = 1.3 VRMS
NFB 0.2 to 10 kHz at 12 dB/oct (S1 closed)
-
-
-
Start Up Time
-
All switches and parameters remain as shown in test circuit unless stated in condition column
START-UP TIME TEST (Refer to Test Circuit)
SEQUENCE CONDITIONS
COMMENTS
1 Power Supply Off
2 S1
3 S2 / S3
Closed
Closed
Removes VIN
Discharges C2 and C3
4 S1
5 S2 / S3
Open
Open
Applies VIN (VIN level is determined from Gain Test)
Removes short from C2 and C3
6 Power Supply
On
7 Gain must be within specification, within 3 seconds after power supply is turned on
TYP MAX UNITS
40 42
dB
- 400
µA
- 370
µA
500 770
µA
35 75
- 41
50 75
27 36
0.5 -
2.5 5.2
1.2 2.5
-3
mA
mA
mA
k
%
%
µV
sec
500 - 25 - 09
2

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600
1kHz
40dB ATTENUATOR
VIN
60k
560
39
10
RT==
IAMP
3
LC/LD549
6
5
C1 2
0.1
S1
C4
0.047
8
4 71
C2 C3
S2 6.8 6.8 S3
ITRANS
TI
1:1
VB=1.3VDC
VOUT
RL
400
All resistors in ohms, all capacitors in µF unless otherwise stated
Gain = 20 Log10 ( VOUT) +40 dB
VIN
Fig. 1 Test Circuit
1 27k
2
3
4
8
+
7
600
+
6
5
All resistors in ohms, all capacitors in farads unless otherwise stated
U.S. Patent No. 4,085,382 - Patented in other countries
Fig. 2 Equivalent Circuit
3
500 - 25 - 09

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VB=1.3VDC
+
6.8
+
6.8
+
6.8
VC=10k
MIC
3
2
46
14
65
0.01
LC506
0.1
LC/LD549
470 TYP
.0.047
15
23 7 8
2.2
GT NC
10k
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 3 Typical Hearing Aid Circuit
41.0
40.2
39.4
38.6
37.8
37.0
0.9
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7
VB (V)
Fig. 4 Volume Gain vs Battery Voltage
1.8
532
524
516
508
500
492
0.9 1.0
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
VB (V)
Fig. 5 Quiescent Current vs Battery Voltage
800
700
600
500
400
300
-20 -10
0 10 20 30 40 50 60 70
TEMPERATURE °C
500 - 25 - 09
Fig. 6 Quiescent Current vs Temperature
4
46
44
42
40
38
36
-20 -10
0 10 20 30 40 50 60
TEMPERATURE (°C)
Fig. 7 Gain vs Temperature
70

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12
LD
10
8
6 LC
4
2
-0 200 400 600 800 1k
LOAD RL ()
Fig. 8 Power Output vs Load Resistance
at 7% Distortion RB = 0
550
500
450
400
350
300
250 THD<5.2% AT VOUT=1.3 VRMS
200
1
10
RT (k)
100
1K
Fig. 10 Quiescent Current vs Current Trim Resistor
41
40
39
38
37
36
0.01
VOUT=0.707 VRMS
0.1 1.0
10
FREQUENCY (kHZ)
Fig. 9 Voltage Gain vs Frequency
100
40.4
40.2
40.0
39.8
VOUT=0.707 VRMS
VB=1.3 V
39.6
0 4 8 12 16 20
SUPPLY VOLTAGE (V)
24 26
Fig. 11 Voltage Gain vs Battery Resistance
REVISION NOTES
Changes to standard packaging information
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
The product is in a 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 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 January 1981 Gennum Corporation. All rights reserved. Printed in Canada.
5 500 - 25 - 09