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Inputs and Outputs
3.4 Inputs and Outputs
TI Plug-N-Play Audio Amplifier Evaluation Platform is equipped with several
standard conectors for audio inputs and outputs.
3.4.1
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
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 and are interconnected such that the stereo phone jack is in series with
the RCA phono jacks, and the signal lines are grounded when no plugs are
inserted (Figure 3–5).
Figure 3–5. Platform Audio Input Jacks
J3
R
Off
R
Audio
Input
J4
R
U1
Signal
Conditioning
S2
Power
Amplifiers
L
L
L
On
Conditioning
J5
The internal switches in the RCA phono jacks (J3 and J5) connect the signal
lines to ground when a plug is not inserted. The internal switches in the stereo
phone jack (J4) connect the module signal inputs to the RCA phono jacks
when a plug is not inserted in the stereo phone jack. These connectors operate
as follows:
With no plugs inserted, the signal lines to the inputs of the signal
conditioning socket, U1 * , are shorted to ground.
With plugs inserted into the RCA phono jacks (J3 and J5) only, the
signal from the phono plugs is routed through the stereo phono jack
internal switches and then on to socket U1 * .
With a plug inserted into the stereo phone jack (J4), the RCA phono
jacks are disconnected from the input and the signal from the phone
plug is applied to socket U1 * .
* or to power amplifier sockets if S2 is set to OFF to bypass conditioning
Details
3-11
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