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General Description
3
General Description
The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average
power into a mono 8Ω bridged-tied load (BTL) with 1% THD + N and with a 5V power supply. The
LM49100 also has a stereo true-ground headphone amplifier capable of 50mW per channel of continuous
average power into a 32Ω single-ended (SE) loads with 1% THD + N.
The LM49100 has three input channels. One pair of SE inputs can be used with a stereo signal. The other
input channel is fully differential and may be used with a mono input signal. The LM49100 features a 32-
step digital volume control and ten distinct output modes. The mixer, volume control, and device mode
select are controlled through an I
Thermal overload protection prevent the device from being damaged during fault conditions. Superior click
and pop suppression eliminates audible transients on power-up/down and during shutdown.
4
Operating Conditions
Temperature Range
T
≤ T
≤ T
MIN
A
MAX
Supply Voltage V
LS
DD
Supply Voltage V
HP
DD
2
2
I
C Voltage (V
I
C )
DD
Temperature Range
2
AN-1622 LM49100 Evaluation Board»
Figure 1. LM49100 Demonstration Board
2
C compatible interface.
Copyright © 2007–2013, Texas Instruments Incorporated
−40°C ≤ T
≤ +85°C
A
2.7V ≤ V
LS ≤ 5.5V
DD
2.4 V ≤ V
HP ≤ 2.9V
DD
2
1.7V ≤ V
I
C ≤ 5.5V
DD
V
HP ≤ V
LS
DD
DD
2
V
I
C ≤ V
LS
DD
DD
–40°C ≤ T
≤ 85°C
A
SNAA043A – October 2007 – Revised May 2013
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