Panasonic EB-G50 Service Manual

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

– 5–10 –GSM Processor(AD6525)ADC/DACVoiceBand&BaseBandCodec.(AD6521)MICSpeakerGPIO5A,V,Bserial PortLDO 3.0VReceiverMeledy ICMA1 Control /DataInterfaceVOUTNOR P/NPhoneJackVOUTAUX P/NAudioAMPBuzzer(L_SPK Mode)VINNOR P/NVINAUX P/NHPOUTFigure 5.9. Audio system block diagramAD6521 is a Voiceband Baseband Codec (VBC) that combines, onto a single chip, all A/D and D/A converters that arenecessary to build a complete GSM, DCS1800, and PCS1900 mobile radio. It has two differential output port, twodifferential input ports, and a buzzer output. Voiceband normal output is used in normal receiver mode.Voiceband auxiliary output is used in earpiece receiver mode. Buzzer output signal via a meledy IC is used in loud-speakmode. About input, voiceband normal input is used to microphone and the auxiliary input is design for earpiece microphone.5.3.1. Voiceband Baseband CodecChipset ADI AD6521Package 64-Ball LFBGAFeature Complete Analog/Digital Interface for Voiceband Input/Output-Signals; Baseband Input/Output-Signals;Auxiliary/Control-Signals Baseband CodecSupports Multi-slot OperationDifferential I and Q Inputs/OutputsOn-Chip GMSK Modulator for GSMTwo 10-Bit D/A Converters10-Bit RAMP D/A ConverterOn-Chip RAMP-RAMTwo High Resolution A/D ConvertersOn-Chip FIR-Filter Voiceband CodecComplete Linear Coded CodecTwo Channel 16-Bit A/D Converter with FilterComplete Microphone InterfaceTwo Channel 16-Bit D/A Converter with FilterComplete Speaker Drive CapabilityProgrammable Gain on Input and OutputMulti-Standard Sample Rate Conversion Auxiliary Section13-Bit AFC D/A Converter10-Bit Current DACSix Channel 10-Bit A/D-Converter5.3. Audio System