Panasonic KX-TCD300FXS

20 CIRCUIT OPERATION (BASE UNIT)
20.1. Outline
Base Unit consists of the following ICs as shown in BLOCK DIAGRAM (BASE UNIT) (P.68).
· DECT BBIC (Base Band IC): IC8
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− Handling all the audio, signal and data processing needed in a DECT base unit
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− Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
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− ADPCM codec filter for speech encoding and speech decoding (DSP section)
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− Echo-cancellation and Echo-suppression (DSP section)
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− Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
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− DTMF receiver (DSP section)
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− Clock Generation for RF Module
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− ADC, DAC, timer, and power control circuitry
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− All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)
· RF Module: IC2
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− PLL Oscillator
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− Detector
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− Compress/Expander
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− First/Second Mixer
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− Amplifier for transmission and reception
· EEPROM: IC3
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− Temporary operating parameters (for RF, etc.)
Refer to EEPROM LAYOUT (BASE UNIT) (P.85).
· Additionally,
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− Power Supply Circuit (+3.3V, +2.5V, +1.8V output)
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− Crystal Circuit (10.368MHz)
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− Charge Circuit
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− Telephone Line Interface Circuit
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KX-TCD300FXS / KX-TCD300FXT / KX-TCA130FXS / KX-TCA130FXT