3. TECHNICAL BRIEF
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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 (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.
Figure Audio Interface Detailed Diagram(MSM6250A)
Summary of Contents for U310
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Page 20: ...3 TECHNICAL BRIEF 21 ...
Page 33: ...3 TECHNICAL BRIEF 34 Figure 3 5 10 1 Bluetooth system architecture ...
Page 47: ...3 TECHNICAL BRIEF 48 Figure PM6650 2M Functional Block Diagram ...
Page 72: ...4 TROUBLE SHOOTING 73 4 2 SIGNAL PATH WCDMA Tx PATH WCDMA Rx PATH ...
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Page 90: ...4 TROUBLE SHOOTING 91 ...
Page 110: ...4 TROUBLE SHOOTING 111 CN501 C537 C538 MSM6250A ...
Page 116: ...4 TROUBLE SHOOTING 117 C216 C217 for MIC serial capacitor MSM6250A ...
Page 119: ...4 TROUBLE SHOOTING 120 Q400 Q401 Q402 VBATT GND ...
Page 149: ... 150 8 pcb layout ...
Page 150: ... 151 8 pcb layout ...
Page 151: ... 152 8 pcb layout ...
Page 152: ... 153 8 pcb layout ...
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Page 160: ...9 Calibration RF Auto Test Program 161 9 3 1 Example for Calibration Click START U310 ...
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