LG L601i Service Manual page 59

3. TECHNICAL BRIEF
3.10.11.2. Audio Signal Processing & Interface
Audio signal processing is divided Uplink path and downlink path. The uplink path amplifies the audio
signal from MIC and converts this analog signal to digital signal and then transmit it to DBB Chip
(MSM6250A).
This transmitted signal is reformed to fit in GSM & WCDMA Frame format and delivered to RF Chip.
The downlink path amplifies the signal from DBB chip (MSM6250A) and outputs it to Receiver (or
Speaker).
The receive path can be directed to either one of two earphone amplifiers or the auxiliary output. The
outputs earphone1 (EAR1OP, EAR1ON) and Auxiliary out (AUXOP, AUXON) are differential outputs.
Earphone2 (HPH_L,EAR2O) is a single-ended output stage. The microphone interface consists of two
differential microphone inputs, one differential auxiliary input and a two-stage audio amplifier.
Figure Audio Interface Detailed Diagram(MSM6250A)
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