KX-TG8551UAB, KX-TG8561UAB, KX-TG8561UAR, KX-TGA855RUB, KX-TGA855RUR - Panasonic Telephone Service Manual (repair manual). Page 9

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Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.8).

• DECT BBIC (Base Band IC): IC501

- Handling all the audio, signal and data processing needed in a DECT base unit
- Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM code filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- PLL Oscillator
- Detector 
- Compress/Expander
- First Mixer
- All interfaces (ex: QSPI FLASH MEMORY, EEPROM, LED, Analog Front End, etc.)
- DCDC Converter
- Integrated 1.9GHz PA for DECT

• EEPROM: IC611

- Temporary operating parameters (for RF, etc.)

• FLASH MEMORY: IC601 (for KX-TG8561 only)

- Voice Prompt (TAM) D/L Area
- ICM/OGM Recording Area

• Additionally,

- Power Supply Circuit (+3.0 V, +2.4 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit

• QSPI FLASH MEMORY IC502

- Main Program D/L Area