General Description
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Figure 1. LM49100 Demonstration Board
3
General Description
The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average
power into a mono 8
Ω
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 32
Ω
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
2
C compatible interface.
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
MIN
≤
T
A
≤
T
MAX
−
40°C
≤
T
A
≤
+85°C
Supply Voltage V
DD
LS
2.7V
≤
V
DD
LS
≤
5.5V
Supply Voltage V
DD
HP
2.4 V
≤
V
DD
HP
≤
2.9V
I
2
C Voltage (V
DD
I
2
C )
1.7V
≤
V
DD
I
2
C
≤
5.5V
V
DD
HP
≤
V
DD
LS
V
DD
I
2
C
≤
V
DD
LS
Temperature Range
–40°C
≤
T
A
≤
85°C
2
AN-1622 LM49100 Evaluation Board»
SNAA043A – October 2007 – Revised May 2013
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