User's Guide
SNAA043A – October 2007 – Revised May 2013
AN-1622 LM49100 Evaluation Board»
1
Quick Start Guide
1. Connect the I
2
C signal generation and interface board to a computer’s parallel port.
2. Apply 2.7V to 5.5V power supply’s positive output to the “VDD” pin on jumper “VDD GND”. Connect
the power supply’s ground return to the “GND” pin also on the aforementioned jumper.
3. Connect the supplied 6-wire (one pin is a No Connect) cable between the I
2
C signal generation and
interface board and the 6-pin connector (I
2
C Interface; one pin is a No Connect) on the LM49100
demonstration board. If logic levels other than those set by V
DD
are required, jumper J1 needs to be
connected and a separate supply applied to the 2–pin header with the I2CVDD pin, with respect to
ground.
4. Headphone amplifier output mode: Apply a stereo input audio signal to jumpers Left Input and Right
Input. Apply the sources’ +input pins and GND pins, respectively, to the demonstration board.
5. Connect a load (
≥
16
Ω
) to header HPL (left headphone) and another load (
≥
16
Ω
) to header HPR (right
headphone). The HPL pin and HPR pin carries the output signals from the two amplifiers, and each of
the other pins connecting to ground making this configuration single-ended connections.
6. Differential mono amplifier output mode: Apply a mono differential input audio signal to jumper Mono
Input. Apply the sources’ +input and –input to the middle two pins of the 4-pin jumper. The two outer
pins are connected to ground, which are used when the mono input is configured as single-ended
instead of differential.
7. Connect the 32
Ω
load across the two pins (differential) of the Speaker jumper on the demonstration
board.
8. Apply power. Make measurements. Enjoy the sound.
2
Introduction
To help you investigate and evaluate the LM49100's performance and capabilities, a fully populated
demonstration board is available from the Texas Instruments Audio Products Group. This board is shown
in
Figure 1
. Connected to an external power supply (2.7V to 5.5V), a signal source and an I
2
C controller
(or signal source), the LM49100 demonstration board easily demonstrate the amplifier's features.
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1
SNAA043A – October 2007 – Revised May 2013
AN-1622 LM49100 Evaluation Board»
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