Texas Instruments SLOU025 manual Signal Routing, Off U2 Stereo Power Amplifier EVM

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Using The TPA122 MSOP EVM With the Plug-N-Play Evaluation Platform

3.3.2Signal Routing

Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3±5.

Figure 3±5. Platform Signal Routing and Outputs

R

 

Audio

U1

Signal

Input

Conditioning

 

L

 

Off

S2

On

U2 Stereo Power

Amplifier EVM

U3

 

 

+

 

Mono Power

R

 

R

 

Amplifier EVM

 

 

±

J7, J8, J9

 

 

 

 

 

 

 

 

Speaker

U4

 

 

±

Outputs

 

 

 

Mono Power

L

 

L

 

Amplifier EVM

 

 

+

 

 

U2 ± U4

 

 

 

 

 

 

R

 

U5

R

 

+

 

TPA122 MSOP

 

GND

±

J10

Headphone

S3

 

Headphone

 

 

Amplifier EVM

L

 

±

Output

 

 

 

+

 

 

 

 

L

 

 

U5

 

 

 

3.3.2.1Signal 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 TPA122 power amplifiers.

-Switch S2 selects or bypasses signal conditioning.

3.3.2.2Headphone 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). It can output either the signal from the the TPA122 MSOP headphone amplifier in socket U5 or the signal from power amplifiers installed in socket U2 or in sockets U3 and U4, as determined by the setting of headphone source select switch S3.

When S3 is set to the headphone amplifier position (U5), the headphone jack is connected to the headphone amplifier EVM output lines. When a plug is inserted into the jack, signals output through J10 are returned to platform ground. A switch inside the headphone jack produces a control signal that can be routed to the headphone amplifier socket to shutdown the TPA122 MSOP EVM when the headphone plug is removed.

-Switch S3 connects the headphone jack to either the headphone amplifier platform socket (U5) or to the platform power amplifier sockets (U2 ± U4).

Details 3-7

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Contents Users Guide Important Notice Related Documentation From Texas Instruments PrefacePage Contents Tables FiguresIntroduction Features Description TPA122 Msop EVM SpecificationsIntroduction EVM JP6 JP7 JP8 Quick StartPower PrecautionsPlatform preparations Quick Start List for PlatformQuick Start List for Stand-Alone Power-upDetails ±1. The TI Plug-N-Play Audio Amplifier Evaluation Platform ±2. TPA122 Msop EVM TPA122 Msop Audio Power Amplifier Evaluation Module±4. TPA122 Amplifier IC 1 TPA122 Audio Amplifier ICShutdown Module GainEVM Insertion Installing and Removing EVM BoardsOff U2 Stereo Power Amplifier EVM Signal Routing±6. Shutdown Polarity Control Power Requirements Inputs Inputs and Outputs1 TPA122 Msop EVM Connected as a Stereo Headphone Amplifier Using The TPA122 Msop EVM Stand-Alone±1. TPA122 Msop EVM Parts List

SLOU025 specifications

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