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Inputs and Outputs
3.4.2
Outputs
Amplified audio signals leave the platform through left and right RCA phono
jacks (J7 and J9), left and right pairs of compression connectors for stripped
speaker wires (J8), and a capacitively-coupled miniature (1/8”) stereo phone
jack (J10) for headphones (Figure 3–6).
Figure 3–6. Platform Audio Output Jacks and Connectors
J7
U2
J3, J4, J5
Audio
Input
R
U1
Signal
Conditioning
Off
S2
R
L
Stereo Power
Amplifier
or
U4 and/or U3
Mono Power
Amplifier(s)
R
L
+
–
–
+
R
J8
L
Speaker
Outputs
J9
L
On
U2 – U4 C3
R
U5
Stereo
Headphone
R
S3
470 μ F
J10
Headphone
Output
Amplifier
L
U5
C2
L
3.4.2.1
3.4.2.2
3-12
Power Amplifier Outputs/Jacks
The audio output lines from the power amplifiers are separate all the way to
the edge of the platform (output jacks J7, J8, and J9) — the Out – lines from
the power amplifier sockets are not tied to each other or to platform ground.
This allows certain power amplifier EVMs to operate in various output drive
modes, including some highly-efficient bridged configurations. To reduce
possible emissions, limit the length of speaker wiring to 1 meter or less.
Headphone Amplifier Output/Jack
The headphone jack (J10) is a stereo miniature phone jack that is capacitively
coupled (via 470 μ F electrolytics) to S3. Source select switch S3 connects the
headphone jack to the output lines of either the headphone amplifier socket
U5, or to the output lines of the power amplifier sockets (U2, U3, and U4).
Some of the TI power amplifier EVMs that can be installed in sockets U2, U3,
or U4 normally operate in the single-ended output mode, and some have the
ability to switch from a bridged output mode to single-ended in response to a
mode control signal. S3 should not be set to the power amplifier position unless
power amplifiers that can operate in the single-ended mode are installed.
When S3 is set to the power amplifier position ( U2 – U4 ), the headphone jack
is connected to the power amplifier Out + output lines. When a headphone plug
is inserted into the jack, these output lines are returned to the common platform
ground inside J10, requiring single-ended power amplifier outputs. For power
amplifier modules that have selectable output modes, a switch inside the
headphone jack sends a control signal to the power amplifier sockets that can
select the single-ended output mode when a headphone plug is inserted.
Details
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