Compander/Expander; Alarm Buzzer; The Other In Audio Asic (I7); Scrambler (Optional) - Benefon DRAGON TDP70WN Service Manual

5.2.8 Compander/Expander

Compander and expander units are included in audio asic I7 and can be
controlled by registers.

5.2.9 Alarm buzzer

Tones for the internal alarm tones are provided by the DTMF generator. The
internal alarm tones path way is DTMF generator, VR8, switch DTMFRXON,
summing junction ADD4, VR11, AMP5 and buzzer. The buzzer volume is
controlled by the DA3.

5.2.10 The other in audio asic (I7)

OSC is the main oscillator and clock divider for the prosessor.
CLKBUF is clock buffer generate clock out from main clock.
INTERFACE & DATA REGISTER is a 16 bit address/data serial interface
circuit.
BIAS is bias current generator for amplifiers.
TIMER is an 8 bit timer (not used).
DA1, DA2, DA3 are 8 bit linear DA converters.

5.2.11 Scrambler (optional)

The CD264 I9 is a frequency domain scrambler compatible with NMT cellular
phone system. It contains separate TX and RX paths for full duplex operation
and operates under µProcessor control via a serial interface. The circuit is
optional.
4Z2200GB.fm
Product: TDP70WN /
5.9.2000
OC2285 Processor/Audio/RF
10