Datasheet

TPS65950

SWCS032E–OCTOBER 2008–REVISED JANUARY 2011

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6.2 Audio/Voice Uplink (TX) Module

The voice uplink path includes two input amplification stages dedicated to ten analog input terminals:

• MIC_MAIN_P, MIC_MAIN_M (differential main handset input)

• MIC_SUB_P, MIC_SUB_M (differential sub handset input)

• HSMICP, HSMICM (differential headset input)

• AUXL (common terminal: single-ended auxiliary/FM radio left channel input)

• AUXR (common terminal: single-ended auxiliary/FM radio right channel input)

• CEA carkit and MCPC transmit audio (TXAF) microphone through DINP/DINM pins

For all cases, only two analog input amplifiers can be used, because two ADCs are available.

The voice uplink path also includes two pulse density modulated (PDM) interfaces for digital microphones.

Two stereo digital microphone interfaces are available.

The left and right FM channels can be connected to any audio output stage (for example, earpiece,

headset speakers, etc.) through a connection matrix.

6.2.1 Microphone Bias Module

Three bias generators provide an external voltage of 2.2 V to bias the analog microphones (MICBIAS1,

MICBIAS2, and HSMICBIAS terminals). The typical output current is 1 mA for each analog bias

microphone.

Two bias generators can provide an external voltage of 1.8 V to bias digital microphones (DIGMIC_0 and

DIGMIC_1). The typical output current is 5 mA for each digital bias microphone.

NOTE

One bias generator can bias two digital microphones at the same time; in this case, the

typical output current is 10 mA.

Figure 6-19 shows the multiplexing for the analog and digital microphones.

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