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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 (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(R) (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.
RT 3
VB 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 VB GND
3 VDC 60 mW -10 to + 40 C -20 to + 70 C
RT I/P DEC2 1 8
OUT2
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25 oC, Supply Voltage VB = 1.3 VDC
PARAMETER Gain Quiescent Current
SYMBOL ACL IAMP ITRANS ITOT
CONDITION VOUT = 0.707 VRMS
MIN 38 100 170 -
TYP 40 500
MAX 42 400 370 770
UNITS dB A A A
Maximum Drive Current
V1 = 0V (S2, S3 closed) V4 = 0V LC549 LV549 LD549 10 10 36 18 THD VOUT = 0.707 VRMS VOUT = 1.3 VRMS 35 50 27 0.5 2.5 1.2 75 41 75 36 5.2 2.5 3 mA mA mA k % % V 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 VIN Discharges C2 and C3 Applies VIN (VIN 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
RT= =
IAMP
VB=1.3VDC
3
6 5
ITRANS VOUT
TI 1:1
LC/LD549
40dB ATTENUATOR VIN 60k 560 S1 600 1kHz 39 4 7 1 C1 0.1 2
C4 0.047
RL 400
8
10 S2
C2 6.8
C3 6.8
S3
All resistors in ohms, all capacitors in F unless otherwise stated
Gain = 20 Log10 ( 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
VB=1.3VDC
+ 6.8
+ 6.8
+ 6.8
MIC 0.01
2 1 2.2
3
4
VC=10k 6 0.1 1 4
6
5 .0.047 8 470 TYP
LC506
5
LC/LD549
23 7
GT 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
IQ (A)
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
VB (V)
VB (V)
Fig. 4 Volume Gain vs Battery Voltage
Fig. 5 Quiescent Current vs Battery Voltage
800
46
700
44
IQ (A)
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
VOUT=0.707 VRMS
4
37
2 -0 200 400 600 800 1k
36 0.01 0.1 1.0 10 100
LOAD RL ()
FREQUENCY (kHZ)
Fig. 8 Power Output vs Load Resistance at 7% Distortion RB = 0
Fig. 9 Voltage Gain vs Frequency
550 500 450
40.4
40.2
A V (dB) THD<5.2% AT VOUT=1.3 VRMS
400
IQ (A)
40.0
350 300
39.8 250 200 1 10 100 1K
VOUT=0.707 VRMS VB=1.3 V
39.6 0 4 8 12 16 20 24 26
R (k)
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. (c) Copyright January 1981 Gennum Corporation. All rights reserved.
Printed in Canada.
5
500 - 25 - 09

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