Texas Instruments TPA701 manual ±6. Mute/Mode and Polarity Control

Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform

Figure 3±6. Mute/Mode and Polarity Control

	VDD
	R3	Polarity
	240 Ω
		JP8
J10		Lo

Headphone

Jack		Hi
R4	R5
		SPK
1 kΩ	1 kΩ	(U2±U4)

JP6

Mode	U3, U4
	Power
	Amplifiers
Mute

3.3.3.2Mute/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.

JTo mute the TPA701 MSOP amplifier module using the control signal from the platform headphone jack, jumper JP6 to MUTE.

JTo not affect the TPA701 amplifier when a plug is inserted into the headphone jack, jumper JP6 to Mode or leave JP6 unjumpered.

3.3.3.3Mute/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.

-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.

3-8 Details