1.9w Differential Input, Btl Output Stereo Audio Amplifier With Selectable Gain And ShutdownThe LM4869 features differential stereo inputs, BTL (bridge-
tied load) outputs, and four externally selectable fixed gains.
Operating on a single 5V supply, the LM4869 delivers 1.2W
and 1.9W (typ) of output power to an 8 and 4 BTL load
(Note 1), respectively, with less than 1% THD+N. The
LM4869s gain is selected using two digital inputs. The nomi-
nal gain values are 6dB, 10dB, 15.6dB, and 21.6dB.
The LM4869 is designed for notebook and other handheld
portable applications. It delivers high quality output power
from a surface-mount package and requires few external
components.
Other features include an active-low micropower shutdown
mode input and thermal shutdown protection. By National Semiconductor Corporation
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