Texas Instruments TPA005D12 3.4.3Signal Routing, ±7. Platform Signal Routing and Outputs, Details

Using The TPA005D12 Class-D EVM With the Plug-N-Play Platform

3.4.3Signal Routing

Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3±7.

Figure 3±7. Platform Signal Routing and Outputs

R
Audio	U1
	Signal
Input
	Conditioning
L

Off

S2

On

			+
	R		R
U2/U3			±	J7, J8, J9
TPA005D12
				Speaker
Amplifier EVM
			±	Outputs
	L		L
			+
	U2 ± U4
			R
U5	R		+
Stereo		GND	±	J10
Headphone	S3			Headphone
Amplifier	L		±	Output
			+
			L
	U5

3.4.3.1Signal Conditioning

The audio signal from 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 TPA005D12 class-D EVM.

-Platform switch S2 selects signal conditioning or bypasses it.

3.4.3.2Headphone Output Jack

Switch S3 is the source select for the stereo headphone output jack, J10. The headphone jack is capacitively coupled (via 470 ∝F electrolytics) and can output either the signal from the headphone amplifier in socket U5, or the signal from the power amplifier installed in socket U2, as determined by the setting of headphone source select switch S3.

-The platform headphone output jack (J10) is not used in conjunction with the TPA005D12 class-D EVM. Switch S3 should be set to the U5 position when the TPA005D12 class-D EVM is installed on the platform.

Details 3-13