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Plug-N-Play Platform Inputs and Outputs
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3.3 Plug-N-Play Platform Inputs and Outputs
The TI plug-n-play audio amplifier evaluation platform is equipped with several
standard conectors for audio inputs and outputs.
3.3.1 Inputs
In most cases, audio signals enter the platform through either a pair of RCA
phono jacks (J3 and J5) or a miniature (1/8″) mono phone jack (J4). Certain
signal conditioning and amplifier EVMs, however, may have additional signal
input connectors mounted on the module circuit board.
The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit
type, grounding the signal input lines when no plugs are inserted.
3.3.2 Outputs
Amplified audio output signals leave the platform through the left RCA phono
jack (J9) and the left pair of compression connectors for stripped speaker wires
(J8).
The audio output lines from the power amplifiers are separate all the way to
the edge of the platform (output jacks J8 and J9) — the OUT+ and OUT– lines
from the power amplifier sockets are not tied to each other or to platform
ground. This allows the TPA032D03 class-D power amplifier EVM to operate
in the highly-efficient bridge-tied load configuration when driving speakers.
The headphone jack (J10) is capacitively coupled to source select switch S3,
which connects J10 to the output lines of either the headphone amplifier
socket or the power amplifier sockets (Figure 3–2).
Figure 3–2. Typical Headphone Plug
Left Right GND