8
KX-TG9471B/KX-TG9472B/KX-TGA939T
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.7).
• 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 Module: IC801
- PLL Oscillator
-Detector
- Compress/Expander
- First Mixer
- Amplifier for transmission and reception
• EEPROM: IC551
- Temporary operating parameters (for RF, etc.)
• FLASH MEMORY 1: IC761
- Voice Prompt (TAM) D/L Area
- ICM/OGM/MEMO Recording Area
• TAM Companion: IC701
- Voice data compression and decompression
- Speaker Amp
- Handset MIC Amp
- Handset Receiver Amp
• Additionally,
- Power Supply Circuit (+4.0 V, +3.3 V, 3.0V, +2.5 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Telephone Line Interface Circuit
• FLASH MEMORY 2: IC561
- Program DL
• LED Driver: IC641, IC701
• LCD Driver: IC641, IC601
• Key Matrix: IC631, IC501
•USB
- USB to UART Bridge Controller: IC901
- Photocoupler: IC902, IC903, IC904, IC905
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