User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin of module
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charge interface
- 3.6. Power saving
- 3.7. Summary of state transition
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M50 Hardware Design
M50_HD_V2.0 - 53 -
SPK2P
AGND
Differential layout
10pF
0603
33pF
0603
Close to Speaker
GND
ESD
Module
22uF
Figure 29:
Handset interface design for AOUT2
Module
SPK2P
AGND
Differential layout
Amplifier
circuit
10pF
0603
10pF
0603
33pF
0603
33pF
0603
Close to Speaker
GND
GND
ESD
ESD
C2
C1
Figure 30:
Speaker interface design with an amplifier for AOUT2
Texas Instrument’s TPA6205A1is recommended for a suitable differential audio amplifier. There
are plenty of excellent audio amplifiers in the market.
Note: The value of C1 and C2 here depends on the input impedance of audio amplifier
.
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