ETC LV549

High Power Class B
Output Stage
LC549/LV549/LD549 DATA SHEET
FEATURES
DESCRIPTION
• 40dB of electrical gain
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.
• 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 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.
VB
RT
6
3
5
INPUT
OUTPUT 1
2
8
OUTPUT 2
4
1
DEC 1 DEC 2
7
GND
U.S. Patent No. 4,085,382
Patented in other countries
BLOCK DIAGRAM
Revision Date: January 2001
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
Document No. 500 - 25 - 09
tel. (905) 632-2996 fax: (905) 632-5946
tel. (03) 3334-7700
fax: (03) 3247-8839
PIN CONNECTION
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE & UNITS
DEC1
Supply Voltage
3 VDC
Power dissipation
60 mW
Operating Temperature
-10 to + 40 °C
Storage Temperature
-20 to + 70 °C
5
4
OUT1
RT
VB
I/P
GND
DEC2
1
8
OUT2
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25 oC, Supply Voltage VB = 1.3 VDC
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
38
40
42
dB
Gain
ACL
Quiescent Current
IAMP
100
-
400
µA
ITRANS
170
-
370
µA
-
500
770
µA
10
10
36
35
50
75
41
75
mA
mA
mA
18
27
36
kΩ
VOUT = 0.707 VRMS
-
0.5
-
%
VOUT = 1.3 VRMS
-
2.5
5.2
%
NFB 0.2 to 10 kHz at 12 dB/oct (S1 closed)
-
1.2
2.5
µV
-
-
3
sec
VOUT = 0.707 VRMS
ITOT
Maximum Drive Current
V1 = 0V (S2, S3 closed)
V4 = 0V LC549
LV549
LD549
Input Impedance
Total Harmonic Distortion & Noise
Input Referred Noise
THD
IRN
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
Closed
Removes VIN
3
S2 / S3
Closed
Discharges C2 and C3
4
S1
Open
Applies VIN (VIN level is determined from Gain Test)
5
S2 / S3
Open
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
500 - 25 - 09
2
RT= =∞
VB=1.3VDC
IAMP
3
ITRANS
6
VOUT
5
LC/LD549
40dB ATTENUATOR
VIN
TI
1:1
C1
60k
C4
0.047
2
RL
400
0.1
560
8
S1
600Ω
1kHz
39
4
10
7
C2
6.8
S2
1
C3
6.8
S3
All resistors in ohms, all capacitors in µF unless otherwise stated
Gain = 20 Log10 ( VOUT ) +40 dB
VIN
Fig. 1 Test Circuit
6
8
1
27k
+
2
7
3
600
4
+
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
VB=1.3VDC
+
6.8
MIC
+
6.8
+
6.8
2
VC=10k
4
3
6
LC506
0.01
1
6
4
1
0.1
5
LC/LD549
5
2 3
470 TYP
.0.047
8
7
2.2
GT
10k
NC
All resistors in ohms, all capacitors in farads unless otherwise stated
41.0
532
40.2
524
39.4
516
IQ (µA)
A V (dB)
Fig. 3 Typical Hearing Aid Circuit
38.6
37.8
508
500
37.0
492
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0.9
1.0
1.1
1.2
Fig. 4 Volume Gain vs Battery Voltage
1.4
1.5
1.6
1.7
1.8
Fig. 5 Quiescent Current vs Battery Voltage
800
46
700
44
600
42
A V (dB)
IQ (µA)
1.3
VB (V)
VB (V)
500
400
40
38
300
36
-20
-10
0
10
20
30
40
50
60
70
-20
TEMPERATURE °C
0
10
20
30
40
50
TEMPERATURE (°C)
Fig. 7 Gain vs Temperature
Fig. 6 Quiescent Current vs Temperature
500 - 25 - 09
-10
4
60
70
12
41
LD
RELATIVE VOLTAGE GAIN (dB)
POWER OUTPUT (mV)
10
8
LC
6
4
2
40
39
VOUT=0.707 VRMS
38
37
36
-0
200
400
600
800
0.1
0.01
1k
1.0
10
100
FREQUENCY (kHZ)
LOAD RL (Ω)
Fig. 9 Voltage Gain vs Frequency
Fig. 8 Power Output vs Load Resistance
at 7% Distortion RB = 0Ω
40.4
550
500
40.2
450
A V (dB)
IQ (µA)
400
350
40.0
300
39.8
THD<5.2% AT VOUT=1.3 VRMS
250
VOUT=0.707 VRMS
VB=1.3 V
200
1
10
100
39.6
1K
R (kΩ)
0
4
8
12
16
20
24
26
SUPPLY VOLTAGE (V)
T
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.
5
Printed in Canada.
500 - 25 - 09