Datasheet

HSMIC.M

HSMIC

Onboard Chip

VHSMIC.OUT

4-wirestereojack

HSOR

HSOL

Rsb

–

HM.P

Gain= –1

HM.M

HM.O

032-023

Ampli_HS

TPS65950

www.ti.com

SWCS032E–OCTOBER 2008–REVISED JANUARY 2011

NOTE

For other component values, see Table 15-1.

Figure 6-10 is a schematic of a headset 4-wire stereo jack optimized.

Figure 6-10. Headset 4-Wire Stereo Jack Optimized

NOTE

For other component values, see Table 15-1.

6.1.4 Headset Pop-Noise Attenuation

Pop noise occurs when the audio output amplifier is switched on. Although the speaker is ac-coupled

through an external capacitor, the sharp rise time given by the activation of the amplifier causes a large

spike to propagate to the speakers. Pop attenuation is achieved through a precharge and discharge of the

external coupling capacitor.

The antipop system using an internal current generator controlling the ramp of charge or discharge is

implemented for the headset output. The pop-noise effect can be dramatically reduced by an external FET

controlled by a 1.8-V output signal (MUTE pin).

Figure 6-11 is a diagram of headset pop noise. Table 6-7 lists the characteristics of headset pop noise.

Submit Documentation Feedback

Product Folder Link(s): TPS65950