Circuit Operation (Base Unit) - Panasonic KX-TCA151AXM Service Manual

20 CIRCUIT OPERATION (BASE UNIT)

20.1. Outline
Base Unit consists of the following ICs as shown in BLOCK DIAGRAM (BASE UNIT) (P.74).
• • • • DECT BBIC (Base Band IC): IC2
− − − − 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 codec 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: RFM1
− − − − PLL Oscillator
− − − − Detector
− − − − Compress/Expander
− − − − First/Second Mixer
− − − − Amplifier for transmission and reception
• • • • FLASH MEMORY: IC7
− − − − Program D/L (DownLoad) Area
• • • • EEPROM: IC3
− − − − Temporary operating parameters (for RF, etc.)
Refer to EEPROM LAYOUT (BASE UNIT) (P.86).
• • • • Additionally,
− − − − Power Supply Circuit (+4.0V (A), +3.2V, +1.8V output)
− − − − Crystal Circuit (10.368MHz)
− − − − Telephone Line Interface Circuit
− − − − SP Phone Circuit
− − − − Curl Cord Handset Interface Circuit
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KX-TCD530AXM / KX-TCA151AXM