Quectel WCDMA UG Series, Manual

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UMTS/HSPA Module Series
WCDMA UGxx Audio Design Note
WCDMA_UGxx_Audio_Design_Note Confidential / Released 3 / 56
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1 Introduction .......................................................................................................................................... 7
2 PCM Characteristic .............................................................................................................................. 8
3 Audio Circuit Design ......................................................................................................................... 11
3.1. PCM Codec Design Circuit with ALC5616 .............................................................................. 12
3.2. PCM Codec Design Circuit with NAU8814 ............................................................................. 13
3.3. PCM Codec Design Circuit with MAX9860 ............................................................................. 14
3.4. Microphone Interface Design .................................................................................................. 15
3.5. Receiver Interface Design ....................................................................................................... 15
3.6. Earphone Interface Design ..................................................................................................... 16
3.7. Speaker Amplifier Design ........................................................................................................ 16
4 Design Consideration ........................................................................................................................ 17
4.1. Power Supply for PCM Codec ................................................................................................ 17
4.2. Audio Layout ........................................................................................................................... 17
4.3. TDD Noise ............................................................................................................................... 18
4.4. Mechanical Design .................................................................................................................. 18
4.5. Component of SPK.................................................................................................................. 20
4.6. Components of Microphone .................................................................................................... 22
5 Audio Tuning in Different Modes ..................................................................................................... 23
5.1. Speech Call in Handset Mode ................................................................................................. 23
5.2. Speech Call in Headset Mode ................................................................................................. 24
5.3. Speech Call in Handfree Mode ............................................................................................... 24
6 Audio AT Command Description ..................................................................................................... 26
6.1. AT+QDAC Digital Audio Interface Configuration .................................................................. 26
6.2. AT+QIIC IIC Read&Write ...................................................................................................... 28
6.3. AT+CLVL Loud Speaker Volume Level ................................................................................ 29
6.4. AT+QAUDGAIN Set Gain Offset .......................................................................................... 29
6.5. AT+QMIC Set Uplink(MIC) Volume ...................................................................................... 30
6.6. AT+CMUT Mute Control ....................................................................................................... 31
6.7. AT+QCLKOUT Output Clock Source ................................................................................... 32
6.8. AT+QSIDET Set the Side Tone Gain in the Current Mode .................................................. 33
6.9. AT+QAUDLOOP Enable Audio Loop Test ............................................................................ 34
6.10. AT+QAUDMOD Set Audio Mode .......................................................................................... 35
6.11. AT+CRSL Set Ring Tone Volume ......................................................................................... 35
6.12. AT+CALM Mute the Ring Tone ............................................................................................. 36
Quectel
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