Panasonic EB-G50 Service Manual

Also see for EB-G50: Operating instructions Operating instructions Operating instructions

– 5–6 –5.2. Baseband OverviewThe Baseband circuits of the phone are required to perform the following functions:8 Equalization8 Channel coding / decoding8 Speech coding / decoding8 Data Encryption8 Layer 1, 2 and 3 software tasks8 Man Machine interface (MMI)8 System Interface8 SIM Interface and Management8 Audio and Tone Generation8 Power supply and battery management8 RF power control8 Synchronization8 Real time clockGSM Processor(AD6525)KeyboardR.F.BlockBBCLKVibratorMemoryFlash/SRAM(64MB / 16MB)ADC/DACVoiceBand&BaseBandCodec.(AD6521)PowerManagement(ADP6522)RTCCrystalRTCBatteryLCD ModuleBacklightLEDMICSpeakerSIMSocketKeypad Data busCLKINOSC32.768kHz Data BusAddress BusLCD Control BusA,V,Bserial PortRF Control BusGPIO12GPO22EXTPWRUSC Data BusVBATSIM interfaceVCCLi-IonBatteryVCOREVBATVANA VANAVANAVCOREVCOREVBATLCD_PWRTX IQRX IQControl SignalVTCXO VTCXOVMEMVRTCVRTCHandfree input HANDFREE INGPIO6LDO 3.0VReceiverVMEMVMEMSIMVCC VSIMPowerJackOverVoltageProtect CircuitChargingCircuitP MOSFETVMEMVRTCSIMVCCBufferVTCXO13MHz_BBMeledy ICControl /DataInterfaceVOUTNOR P/NYMU_AVCCPhoneJack VOUTAUX PBuzzer(L_SPK Mode)VINNOR P/NVINAUX P/NHPOUTTX/RXBACKLIGHTCharging control interfaceLDO 3.0VV_LEDWhite LEDDRV 4.5VV_LEDAnalogSwitchPJ_FUNC_SELTX/RXAudioGPIO 13PJ_FUNC_SELFigure 5.5. Baseband Block DiagramThe EB-G50 Baseband is built around a GSM chipset developed by Advanced Device. One chip (AD6525) carries outsignal processing with DSP and CPU, and the other chip (AD6521) provides the analogue interface.The highly integrated nature of the chips means that each contains a large number of functions.5.2.1. Introduction