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
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charging interface
- 3.6. Power saving
- 3.7. Summary of state transitions
- 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
M80 Hardware Design
M80_HD_V1.2 - 55 -
SPK2P
AGND
Differential layout
10pF
33pF
Close to receiver
GND
ESD
ANTI
Module
22uF
Figure 29: Handset interface design for AOUT2
SPK2P
AGND
Differential layout
Amplifier
circuit
10pF
10pF
33pF
33pF
Close to speaker
GND
GND
ESD
ANTI
ESD
ANTI
Module
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 depends on the input impedance of audio amplifier.