LC549.pdf

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High Power Class B
Output Stage
LC549/LV549/LD549 DATA SHEET
FEATURES
•
40dB of electrical gain
•
1.0 to 1.6 VDC supply operating range
•
current trim capability (R
T
)
•
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)
DESCRIPTION
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.
R
T
3
V
B
6
5
OUTPUT 1
INPUT
2
8
OUTPUT 2
4
1
7
GND
DEC 1 DEC 2
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
Japan Branch: A-302 Miyamae Village, 2-10-42 Miyamae, Suginami-ku Tokyo 168, Japan
tel. (905) 632-2996 fax: (905) 632-5946
tel. (03) 3334-7700
fax: (03) 3247-8839
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power dissipation
Operating Temperature
Storage Temperature
VALUE & UNITS
DEC1
PIN CONNECTION
4
5
OUT1
V
B
GND
3 VDC
60 mW
-10 to + 40
°C
-20 to + 70
°C
R
T
I/P
DEC2
1
8
OUT2
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25
o
C, Supply Voltage V
B
= 1.3 VDC
PARAMETER
Gain
Quiescent Current
SYMBOL
A
CL
I
AMP
I
TRANS
I
TOT
CONDITION
V
OUT
= 0.707 V
RMS
MIN
38
100
170
-
TYP
40
-
-
500
MAX
42
400
370
770
UNITS
dB
µA
µA
µA
Maximum Drive Current
V1 = 0V (S2, S3 closed)
V4 = 0V LC549
LV549
LD549
10
10
36
18
THD
V
OUT
= 0.707 V
RMS
V
OUT
= 1.3 V
RMS
-
-
-
-
35
-
50
27
0.5
2.5
1.2
-
75
41
75
36
-
5.2
2.5
3
mA
mA
mA
kΩ
%
%
µV
sec
Input Impedance
Total Harmonic Distortion & Noise
Input Referred Noise
Start Up Time
IRN
NFB 0.2 to 10 kHz at 12 dB/oct (S1 closed)
All switches and parameters remain as shown in test circuit unless stated in condition column
START-UP TIME TEST
(Refer to Test Circuit)
SEQUENCE
1
2
3
4
5
6
7
Power Supply
S1
S2 / S3
S1
S2 / S3
Power Supply
CONDITIONS
Off
Closed
Closed
Open
Open
On
Removes V
IN
Discharges C2 and C3
Applies V
IN
(V
IN
level is determined from Gain Test)
Removes short from C2 and C3
COMMENTS
Gain must be within specification, within 3 seconds after power supply is turned on
500 - 25 - 09
2
R
T=
=∞
I
AMP
V
B=
1.3VDC
3
6
5
I
TRANS
V
OUT
TI
1:1
LC/LD549
40dB ATTENUATOR
V
IN
60k
560
S1
600Ω
1kHz
39
4
7
1
C1
0.1
2
C4
0.047
R
L
400
8
10
S2
C2
6.8
C3
6.8
S3
All resistors in ohms, all capacitors in
µF
unless otherwise stated
Gain = 20 Log
10
(
VOUT
) +40 dB
VIN
Fig. 1 Test Circuit
6
8
1
27k
+
2
3
4
+
7
600
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
V
B=
1.3VDC
+
6.8
+
6.8
+
6.8
MIC
0.01
2
1
2.2
3
4
V
C=
10k
6
0.1
1
4
6
5
.0.047
8
470 TYP
LC506
5
LC/LD549
2 3
7
G
T
10k
NC
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 3 Typical Hearing Aid Circuit
41.0
532
40.2
524
39.4
516
A
V
(dB)
38.6
I
Q
(µA)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
508
37.8
500
37.0
492
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
V
B
(V)
V
B
(V)
Fig. 4 Volume Gain vs Battery Voltage
Fig. 5 Quiescent Current vs Battery Voltage
800
46
700
44
I
Q
(µA)
600
42
500
A
V
(dB)
-20
-10
0
10
20
30
40
50
60
70
40
400
38
300
36
-20
-10
0
10
20
30
40
50
60
70
TEMPERATURE
°C
TEMPERATURE (°C)
Fig. 6 Quiescent Current vs Temperature
500 - 25 - 09
Fig. 7 Gain vs Temperature
4
12
41
LD
RELATIVE VOLTAGE GAIN (dB)
10
40
POWER OUTPUT (mV)
8
39
6
LC
38
V
OUT
=0.707 V
RMS
4
37
2
-0
200
400
600
800
1k
36
0.01
0.1
1.0
10
100
LOAD R
L
(Ω)
FREQUENCY (kHZ)
Fig. 8 Power Output vs Load Resistance
at 7% Distortion R
B
= 0Ω
Fig. 9 Voltage Gain vs Frequency
550
500
450
40.4
40.2
A
V
(dB)
THD<5.2% AT V
OUT
=1.3 V
RMS
400
I
Q
(µA)
40.0
350
300
39.8
250
200
1
10
100
1K
V
OUT
=0.707 V
RMS
V
B
=1.3 V
39.6
0
4
8
12
16
20
24
26
R (kΩ)
T
SUPPLY VOLTAGE (V)
Fig. 10 Quiescent Current vs Current Trim Resistor
Fig. 11 Voltage Gain vs Battery Resistance
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.
REVISION NOTES
Changes to standard packaging information
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

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