KX-TG8288UAT, KX-TG8287UAT, KX-TGA828UAT, KX-TGA828RUT - Panasonic Telephone Service Manual (repair manual). Page 8

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Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.7).

• 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
- All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)

• RF Module: IC801

- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- Amplifier for transmission and reception

• EEPROM: IC502

- Temporary operating parameters (for RF, etc.)

• FLASH MEMORY 1: IC602

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

• TAM Companion: IC601

- Voice data compression and decompression
- Speaker Amp

• Additionally,

- Power Supply Circuit (+4.0V, +3.3V, +2.5V, +1.8V output)
- Crystal Circuit (10.368MHz)
- Charge Circuit
- Telephone Line Interface Circuit

• FLASH MEMORY 2: IC603

- Program DL

• LED Driver: IC606
• LCD Driver: IC607/IC608
• Key Matrix: IC605