Texas Instruments TPA0103 User Manual download pdf (Page 25)

Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform

3-11

Details

3.3.3 Signal Routing

Signal flow on the platform is controlled by two signal routing switches, as

shown in Figure 3–5.

Figure 3–6. Platform Signal Routing and Outputs

Signal

Conditioning

Off

Stereo

Headphone

Amplifier

U2–U4

J10

Headphone

Output

Audio

Input

Speaker

Output

–

TPA0103

Amplifier EVM

–

GND

3.3.3.1 Signal Conditioning

The audio signal from the input jacks can be applied to the signal conditioning

socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the

audio input signal applied directly to the inputs of the TPA0103.

Switch S2 selects signal conditioning or bypasses it.

3.3.3.2 Headphone Output Jack

Switch S3 is the source select for the stereo headphone output jack, J10. The

headphone jack is capacitively coupled (via 470 µF electrolytics) and can

output either the signal from the headphone amplifier in socket U5, or the

signal from the TPA0103 power amplifier installed in socket U2, as determined

by the setting of headphone source select switch S3.

When S3 is set to the power amplifier position (U2 – U4), the headphone jack

is connected to the TPA0103 left and right OUT+ output lines. When a plug is

inserted into the jack, signals output through J10 are returned to platform

ground, requiring single-ended power amplifier operation. A switch inside the

headphone jack produces a control signal that can be routed to the power

amplifier socket to shut down the TPA0103 EVM or switch it to stereo

single-ended headphone output mode when a plug is inserted.

Source select switch S3 connects the headphone jack to the output lines of

either the headphone amplifier socket U5 or the power amplifier sockets

(U2 – U4).

To route the TPA0103 single-ended stereo headphone amplifier

outputs to the headphone output jack (J10), set switch S3 to the power

amplifier position (

U2 – U4

)

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Texas Instruments TPA0103 User Manual Page 25

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