2
Operation
2.1
Quick-Start List for Stand-Alone Operation
2.1.1
Power and Ground
2.1.2
Inputs and Outputs
2.1.2.1
Audio
2.1.2.2
Shutdown Controls
2.1.3
Gain Setting
2.1.4
Hi-Z Control
2.1.5
Power Up
Operation
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This section describes how to operate the TPA6135A2EVM.
Use the following steps when operating the TPA6135A2EVM stand alone or when connecting the EVM
into an existing circuit.
1. Verify that the external power sources are set to OFF.
2. Set the power supply voltage between 2.5 V and 5.5 V. When connecting the power supply to the
EVM, first connect the ground connection to the GND connector, and then connect the positive supply
to the V
DD
connector. Verify that the connections are made to the correct banana jacks.
1. Verify that the audio source is set to the minimum level.
2. Connect the audio source to the inputs, INL and INR. Shunt JP1 and JP2 for single-ended input.
3. Connect a headset or other load to the headphone jack.
1. Shutdown is controlled by pushbutton S1. Press and hold S1 to place the TPA6135A2 in shutdown.
Release S1 to reactivate the TPA6135A2.
Set the gain of the TPA6135A2 at GAIN. Set GAIN = 0 for -6dB. Set GAIN = 1 for 6 dB.
Output will be in Hi-Z state when HIZ = 1. Set HIZ = 0 to disable the Hi-Z mode.
1. Verify the correct connections as described in Sections 2.1.1 and 2.1.2.
2. Verify the correct voltage setting of the power supply and turn ON the power supply. Proper operation
of the EVM should begin.
3. Adjust the audio signal source as needed.
TPA6135A2 EVM
2
SLOU253 – February 2009
