Datasheet National Semiconductor LM389

LM389 Low Voltage Audio Power Amplifier
with NPN Transistor Array
Low quiescent current drain
Voltage gains from 20 to 200
Y Ground referenced input
Y Self-centering output quiescent voltage
Y Low distortion
Transistors
Y Operation from 1 mA to 25 mA
Y Frequency range from DC to 100 MHz
Y Excellent matching
Y General Description Y The LM389 is an array of three NPN transistors on the same
substrate with an audio power amplifier similar to the
LM386.
The amplifier inputs are ground referenced while the output
is automatically biased to one half the supply voltage. The
gain is internally set at 20 to minimize external parts, but the
addition of an external resistor and capacitor between pins
4 and 12 will increase the gain to any value up to 200.
The three transistors have high gain and excellent matching
characteristics. They are well suited to a wide variety of applications in DC through VHF systems. Applications
Y
Y Features Y Amplifier …