Read Panasonic KX-TCD700 Service Manual Supplement online
2.1.4.
AUDIO PATH - TX AUDIO (SEE Fig. 25)
(Changed from original section 6.1.7. AUDIO PATH-TX AUDIO (SEE Fig. 25))
The audio signal from the microphone (TP23) enters the BBIC at pin 44. RF decoupling and signal conditioning are provided
by C17, R21, and C14.
by C17, R21, and C14.
In the BBIC the signal passes through the analogue section where it is amplified and converted to a digital audio stream signal.
The burst mode controller processes this stream performing encryption and scrambling, adding the various other fields to
produce the GAP standard DECT frame, assigning to a time slot and channel etc. to emerge on pin 14 as TXDA.
The burst mode controller processes this stream performing encryption and scrambling, adding the various other fields to
produce the GAP standard DECT frame, assigning to a time slot and channel etc. to emerge on pin 14 as TXDA.
2.1.5.
AUDIO PATH - RX AUDIO (SEE Fig. 25)
(Changed from original section 6.1.8. AUDIO PATH-RX AUDIO (SEE Fig. 25))
Audio from the receiver RXDA enters the BBIC on pin 10 as GAP standard DECT frames. It passes through the decoding
section burst mode controller where it separates out the frame information and performs de-encryption and de-scrambling as
required. It then goes to the DSP where it is turned back into analogue audio. This is amplified by the analogue front end and
emerges at pin 40 and 41. The telephone speaker is driven directly from the BBIC output ports.
section burst mode controller where it separates out the frame information and performs de-encryption and de-scrambling as
required. It then goes to the DSP where it is turned back into analogue audio. This is amplified by the analogue front end and
emerges at pin 40 and 41. The telephone speaker is driven directly from the BBIC output ports.
On 700 models the ring alarm is provided by means of a buzzer BUZ1 which is switched by T4 from pin 68.
2.1.6. CLOCK GENERATION (SEE Fig. 25)
(Changed from original section 6.1.9. CLOCK GENERATION (SEE Fig. 25))
A single clock generator in the BBIC uses an external crystal X1 to derive all clock frequencies used in the handset. The crystal
is tuned to the exact frequency of 10.368 MHz during manufacture.
is tuned to the exact frequency of 10.368 MHz during manufacture.
The BBIC provides a reference clock signal SYRI (pin 21, TP101) which is used to drive the PLL circuitry in the RF module. The
basic data rate for TXDA (pin 14) and RXDA (pin 10) is 1.152 Mbits/s, which is 10.368MHz divided by 9.
basic data rate for TXDA (pin 14) and RXDA (pin 10) is 1.152 Mbits/s, which is 10.368MHz divided by 9.
Fig.25
4
KX-TCD700SERIES
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