Panasonic KX-TG6451BX - Page 3

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KX-TG6451BX/KX-TGA641BX
1.2. Circuit Operation (Base Unit)
1.2.1. Outline
Base unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.2).
• DECT BBIC (Base Band IC): IC501
- Handling all the audio, signal and data processing needed in a US DECT base unit
- Controlling the US 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 Tranceiver (LNA Mixer IF Filter, Modulator/Demodulator, PLL, Vco)
• EEPROM: IC561
- Temporary operating parameters (for RF, etc.)
• FLASH MEMORY: IC541
- Voice Prompt (TAM) D/L Area
- ICM/OGM/MEMO Recording Area
• TAM Companion: IC201
- Voice data compression and decompression
- Speaker Amp
• Additionally,
- Power Supply Circuit (+4.0 V, +3.3 V, +2.5 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Telephone Line Interface Circuit