Circuit Operation (Base Unit); Outline - Panasonic KX-TG9581B Service Manual

4.2.

Circuit Operation (Base Unit)

4.2.1.

Outline

Base unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.8).
• DECT BBIC (BBIC(Master)): IC601
- 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, EEPROM, LED, Analog Front End, etc.)
- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- Amplifier for transmission and reception
- Voice data compression and decompression
- Speaker Amp
- SP-Phone MIC Amp
- SP-Phone Speaker Amp
• EEPROM: IC604
- Temporary operating parameters (for RF, etc.)
• FLASH MEMORY 1: IC602
- Voice Prompt (TAM) D/L Area
- ICM/OGM/MEMO Recording Area
• Additionally,
- Power Supply Circuit (+4.0 V, +3.4 V, +3.0V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Telephone Line Interface Circuit
• FLASH MEMORY 2: IC603
- Program DL
• LED Driver: IC102, IC103
• LCD Driver: IC601
• Key Matrix: IC101
• BBIC (Slave) IC701
- 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)
• FLASH MEMORY IC703
- Program DL
• BT Module (IC501)
- Use for Bluetooth communication
• USB
- USB to UART Bridge Controller: IC401
- Photocoupler: IC402, IC403, IC404, IC405
9
KX-TG9581B/KX-TG9582B/KX-TGA950B