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| 1vv0300715 Rev. 1 - 19/09/06 |
7.4 | Microphone Biasing | 36 | ||
| 7.4.1 | Balanced Microphone Biasing | 36 | |
| 7.4.2 | Unbalanced Microphone Biasing | 37 | |
7.5 | Microphone Buffering | 39 | ||
| 7.5.1 | Buffered Balanced Mic | 39 | |
| 7.5.2 | Buffered Unbalanced (Single Ended) Microphone | 41 | |
8 | OUTPUT LINES (Speaker) | 44 | ||
8.1 | Short description | 44 | ||
8.2 | Output Lines Characteristics | 45 | ||
8.3 | General Design Rules | 46 | ||
| 8.3.1 | Noise Filtering | 46 | |
8.4 | Handset Earphone Design | 47 | ||
8.5 | 48 | |||
8.6 | Car Kit Speakerphone Design | 49 | ||
8.7 | The Evaluation Kit for Telit Modules EVK2 | 50 | ||
| 8.7.1 | Short Description | 50 | |
| 8.7.2 | EVK2 Audio Lines Characteristics | 51 | |
9 | SIM DESIGN GUIDES | 52 | ||
9.1 | Data Integrity | 52 | ||
9.2 | EMI/EMC | 52 | ||
9.3 | ESD | 52 | ||
9.4 | SIM Supply | 53 | ||
9.5 | SCHEMATIC | 53 | ||
9.6 | LAYOUT | 54 | ||
10 | General Purpose I/O | 55 | ||
10.1 |
| Using a GPIO Pad as INPUT | 55 | |
10.2 |
| Using a GPIO Pad as OUTPUT | 55 | |
10.3 |
| Using the Alarm Output GPIO6 | 56 | |
10.4 |
| Using the Buzzer Output GPIO7 | 56 | |
11 | DAC and ADC section | 57 | ||
11.1 |
| DAC Converter | 57 | |
| 11.1.1 | Description | 57 | |
| 11.1.2 | Enabling DAC | 58 | |
| 11.1.3 Low Pass Filter Example | 58 | ||
11.2 |
| ADC Converter | 59 | |
| 11.2.1 | Description | 59 | |
| 11.2.2 | Using ADC Converter | 59 |
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved | page 3 of 79 |