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27.1.1999
4A0701GB.__1
13
Product: TDP-52-SN3 (Sigma Gold) / OA0700 Audio
5.1.14 Audio signals for answer module
The record signal comes from the tx side through the switch AUDLOOPON,
ADD4, VR11 and AMP5 to answer module I101. The audio signal from the
answer module comes to the summing junction AMP6.
5.1.15 The other in audio asic (I405)
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.