Mute/Mode And Polarity Control - Texas Instruments TPA701 User Manual

Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform
Figure 3–6. Mute/Mode and Polarity Control
Headphone
3.3.3.2 Mute/Mode Select (JP6)
A 3-pin jumper header (JP6) on the platform, functioning as a SPDT switch,
routes the control signal from the headphone jack to either the mute control
input pin or the mode control input pin of the evaluation module.
3.3.3.3 Mute/Mode Polarity Select (JP8)
A second 3-pin jumper header (JP8) on the platform selects the control signal
polarity by connecting either the active-high or the active-low line from the
headphone jack to jumper JP6.
-
-
3-8
V DD
R3
240
J10
Jack
R4
1 k
J
To mute the TPA701 MSOP amplifier module using the control signal
from the platform headphone jack, jumper JP6 to MUTE.
J
To not affect the TPA701 amplifier when a plug is inserted into the
headphone jack, jumper JP6 to Mode or leave JP6 unjumpered.
When JP6 is set to Mute, use the following JP8 settings for the TPA701:
J
To mute the TPA701 MSOP amplifier module when a plug is inserted
into the headphone jack, jumper JP8 to Hi (this is the typical setting).
J
To mute the TPA701 MSOP amplifier module until a plug is inserted
into the headphone jack, jumper JP8 to Lo .
When JP6 is set to Mode, the TPA701 amplifier is unaffected by the inser-
tion of the headphone plug.
Polarity
JP8 JP6
Mode
Lo
Hi Mute
SPK
R5
1 k (U2–U4)
U3, U4
Power
Amplifiers
Details