Texas Instruments TPA0242 - Manual (Page 26)

Using The TPA0242 EVM With the Plug-N-Play Evaluation Platform
3-10 Details
3.3.2.1 S1 — Shutdown Switch
Pushbutton switch S1 on the EVM allows the manual shutdown of the
TPA0242 amplifier IC.
3.3.2.2 S3 — Output Mode Jumper
To keep the module amplifier IC in the single-ended output mode regardless
of the module control input state, set jumper S3 to ON.
Jumper S3 connects the SE/BTL output mode control input pin on the amplifier
IC directly to V
DD
, so that when S3 is ON, the IC is held in the single-ended
output mode regardless of the state of the SE/BTL module control input. When
S3 is OFF, a pulldown resistor on the module holds the IC output mode control
input pin low, keeping the IC in the BTL output mode.
The TPA0242 amplifier IC has two separate inputs for each channel. An
internal multiplexor selects which input will be connected to the amplifier
based on the state of the SE/BTL pin on the IC.
3.3.2.3 S3 — Input Mode Jumper
To force the module amplifier IC to use the HP input regardless of the module
control input state, set jumper S3 to ON.
Jumper S3 connects the HP/LINE input mode control pin on the amplifier IC
directly to V
DD
, so that when S3 is ON, the IC is held in the HP input mode re-
gardless of the state of the HP/LINE module control input. When S3 is OFF,
a pulldown resistor on the module holds the IC input control mode input pin low,
allowing the IC to use the LINE inputs as the source of an input signal.
3.3.2.4 S4 — Input and Output Mode Jumper
To force the module amplifier IC to use the HP input when in SE output mode
and to use the LINE input when in BTL output mode, set jumper S4 to ON.
When jumper S4 is ON, the HP/LINE input mode control pin on the amplifier
IC and the SE/BTL output mode control pin on the amplifier IC are shorted to-
gether so that both the input and output multiplexors switch simultaneously.
When S4 is OFF, the input and output modes may be switched independently
of each other.