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Product Technical Specification & Customer Design Guidelines
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4.10 Analog audio interface
The AirPrime SL808X Embedded Module analog audio interface supports one
microphone input and one speaker output.
Tabl e 4- 1 5 describes the purpose and features of this interface.
4.10.1 Pin descriptions
Tabl e 4- 2 0 describes the analog audio interface pins.
4.10.2 Microphone features
The microphone can be connected in either differential or single-ended mode:
• Differential mode—Default method (recommended). Rejects common mode
noise and TDMA noise.
• Single-ended mode—Requires good ground plane, filtering and shielding to
avoid audio path disturbances. Note that the audio input signal is decreased
by 6 dB compared to differential mode.
Table 4-19: Audio interface features
Feature Details
Implementation
• Supports analog audio processing
• Does not provide on-board filtering (except for
0.1 µFblocking capacitors on microphone lines)
• Host must provide bias and signal filters
• Host should terminate unused audio lines with pull-down
resistors
• ESD protection may be required on audio interface lines
Features
• Echo cancellation and noise reduction
• TTY/TDD compatibility through the microphone/speaker
connections (Note: TTY/TDD is not supported by the PCM
interface.)
Table 4-20: Analog audio interface connections
Pin Name I/O type Description Type Notes
53 MIC1_P Line Audio input A Differential audio input, line level. In series
with 0.1µF DC blocking capacitor.
54 MIC1_N Line Audio input A Differential audio input, line level. In series
with 0.1µF DC blocking capacitor.
56 SPK_N Main speaker A Differential audio output, line level
57 SPK_P Main speaker A Differential audio output, line level
- AirPrime SL808X 1
- AM to 5:00 PM Pacific Time 4
- Contents 5
- List of Figures 11
- List of Tables 13
- 1. Introduction 15
- C to +65C 18
- 1.2 Support features 19
- 1.3 Support tools 19
- 1.4 Accessories 20
- 1.6 Ordering information 20
- 1.7 Environmental issues 20
- 2: Functional Specifications 23
- 3: Technical Specifications 25
- 3.1.2 Power input (VCC_3V6) 26
- 3.1.3 Start-up current 26
- 3.2 Ground connection 27
- 3.4 Mechanical specifications 27
- 2.4 (nominal) 28
- 3.5 Labeling 29
- 3.6 Embedded SIM (eSIM) 29
- 3.7 Thermal considerations 30
- 3.9 Firmware upgrade 30
- 4: Interfaces 31
- Primary Antenna 32
- SL808x Block Schematic 32
- 4.1.1 Pin configuration 33
- 4.1.2 Pin description 34
- 4.3 Reference schematic 40
- 4.5 Main serial link (UART1) 41
- 4.6 SIM interface 42
- 4.6.1 SIM pin descriptions 43
- 4.6.2 Application notes 43
- 4.7 USB 2.0 interface 44
- 4.7.1 USB pin descriptions 45
- 4.7.3 Application notes 45
- 4.7.5 USB Suspend mode 46
- 4.7.6 USB Resume mode 46
- 4.8 RF interface 47
- 4.8.2 RF pin descriptions 48
- 4.8.3 RF performance 48
- • Connectorized 49
- • Nominal condi 49
- 4.8.4 Antenna specifications 50
- 4.9 Audio interfaces 51
- 4.10 Analog audio interface 52
- 4.10.2.1 MIC microphone input 53
- AirPrime SL module 54
- 4.10.3 Speaker features 57
- 4.10.3.2 SPK speaker output 58
- 4.11.1 PCM pin descriptions 62
- 4.11.2 PCM waveforms 63
- 4.12 JTAG interface 64
- 5: Signals and Indicators 65
- 5.2.1 Pin descriptions 66
- 5.2.3 Application notes 66
- 5.3.1 Pin descriptions 68
- 5.3.3 Application notes 69
- 5.4 Wake signal (WAKE_N) 70
- 5.5.1 Pin descriptions 71
- 5.5.3 Application notes 71
- 5.6 Buzzer output (BUZZER_EN) 72
- 5.7 Flash LED (LED_FLASH) 73
- 5.8 Power rail (VREF_1V8) 74
- 5.9 Reserved 75
- 6: Power Consumption 77
- 100—200 mA less 78
- 6.1 Power states 79
- 6.1.1 Power state transitions 80
- 7.1 UMTS WCDMA FDD 83
- 7.2 Supported specifications 85
- • Asynchronous 9,600 bps 88
- • Asynchronous 14,400 bps 88
- (Continued) 92
- Item GSM UMTS 92
- 8: Design Guidelines 95
- 8.4 Antenna 96
- 8.7 Routing constraints 97
- 8.7.2 SIM interface 98
- 8.7.3 Audio circuit 98
- 8.7.4 RF circuit 98
- Figure 8-4: Routing examples 99
- 8.9 Mechanical integration 101
- 8.10 Operating system upgrade 101
- 9: Embedded Testability 103
- 9.5 Serial link access 104
- 9.6 RF output accessibility 105
- 10.2 Certification compliance 107
- 10.3.1 Important notice 108
- 10.3.2 Safety and hazards 108
- North American users 109
- 11: Customization 111
- 12: Safety Recommendations 113
- 12.2 General safety 114
- 12.2.5 Aircraft 115
- 12.2.6 Children 115
- 12.2.7 Blasting areas 115
- References 117
- 14: References 119
- 14.3 Abbreviations/acronyms 120
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