Filter
Top Products
Inputs and Outputs
3-15
Details
3.3.6 Inputs and Outputs
The TI Plug-N-Play Audio Amplifier Evaluation Platform is equipped with
several standard conectors for audio inputs and outputs.
3.3.6.1 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″) stereo 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.
3.3.6.2 Outputs
When the TPA0103 EVM is installed, amplified audio output signals leave the
platform through the negative left and right compression connectors for
stripped speaker wires (J8) and through a miniature (1/8″) stereo phone jack
(J10), for headphones.
The TPA0103 EVM BTL center channel audio output from amplifier IC leave
the platform via the left and right negative (black) compression connectors of
J8.
The positive (red) connectors of J8 are not used.
Each output is isolated
from system ground allowing the TPA0103 center channel power amplifier to
operate in the highly-efficient bridge-tied load configuration for driving a
speaker.
The platform 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 3–6). When the
TPA0103 single-ended left and right stereo headphone output signals are
routed to J10 by S3, signals output via J10 are returned to platform ground
when a plug is inserted (Figure 3–8).
Figure 3–8. Typical Headphone Plug
Left Right GND