3.10.10.2. 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 (EAR2O) is a single-ended output stage designed to drive a headset
speaker. The microphone interface consists of two differential microphone inputs, one differential
auxiliary input and a two-stage audio amplifier.
- 60 -
Figure. Audio Interface Detailed Diagram(MSM6250A)
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Summary of Contents for U300
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Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram Z 3 X B O X C O M ...
Page 76: ...4 TROUBLE SHOOTING 77 4 5 Checking WCDMA Block Z 3 X B O X C O M ...
Page 77: ...4 TROUBLE SHOOTING 78 4 3 5 1 2 Z 3 X B O X C O M ...
Page 82: ...4 TROUBLE SHOOTING 83 4 5 5 Check RF Rx Level Test Point RF Rx Level Z 3 X B O X C O M ...
Page 85: ...4 6 Checking GSM Block 4 TROUBLE SHOOTING 86 Z 3 X B O X C O M ...
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Page 116: ...4 TROUBLE SHOOTING 117 C201 C202 for MIC capacitor Z 3 X B O X C O M ...
Page 119: ...4 TROUBLE SHOOTING 120 Q400 Q401 Q402 VBATT GND Z 3 X B O X C O M ...
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Page 156: ...9 Calibration 157 Check testing object Click Start for Calibration Z 3 X B O X C O M ...
Page 157: ...9 Calibration 158 Show result of calibration Show result Z 3 X B O X C O M ...
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