Gennum Corporation LV549, LD549, LC549 Datasheet
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)
V
R
B
T
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.
6
3
5
OUTPUT 1
INPUT
2
4
1
DEC 1 DEC 2 GND
U.S. Patent No. 4,085,382
Patented in other countries
8
OUTPUT 2
7
BLOCK DIAGRAM
Revision Date: January 2001
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
Document No. 500 - 25 - 09
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION
PARAMETER VALUE & UNITS
Supply Voltage 3 VDC
Power dissipation 60 mW
Operating Temperature -10 to + 40 °C
DEC1
I/P
DEC2
4
R
T
1
5
OUT1
V
B
GND
8
OUT2
Storage Temperature -20 to + 70 °C
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25 oC, Supply Voltage VB = 1.3 VDC
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
Gain A
Quiescent Current I
CL
AMP
I
TRANS
I
TOT
Maximum Drive Current V1 = 0V (S2, S3 closed)
Input Impedance 18 27 36 kΩ
V
= 0.707 VRMS 38 40 42 dB
OUT
100 - 400 µA
170 - 370 µA
- 500 770 µA
V4 = 0V LC549 10 35 75 mA
LV549 10 - 41 mA
LD549 36 50 75 mA
Total Harmonic Distortion & Noise THD V
= 0.707 VRMS - 0.5 - %
OUT
V
= 1.3 VRMS - 2.5 5.2 %
OUT
Input Referred Noise IRN NFB 0.2 to 10 kHz at 12 dB/oct (S1 closed) - 1.2 2.5 µV
Start Up Time - - 3 sec
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 V
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
IN
500 - 25 - 09
2
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