V1.0 Page 9 of 38 ICM MP CC ST
A35-A36-A40 Company Confidential 09/01
4.2.3 Synthesizer : LO2
The second local oscillator (LO2) consists of: Notes
a) the SMARTIs (D400) PLL part
b) the 13MHz reference signal
c) a switchable VCO (inside the SMARTi)
d) an external filter (C509,C510,R501).
The VCO generates 2 frequencies (1440MHz for RX-Mode and 1696 MHz for
TX-Mode).
Both frequencies are divided by 4, to get the 360MHz demodulator frequency and
the 424MHz modulator frequency.
The RX/TX switching is done internally, initiated by the EGOLD+ through the
SYGCCL, SYGCDT,SYNSTR signals.
Using the EGOLD+ signal PUPLO2 (TDMA-Timer L11) at pin 16, the second local
oscillator is switched “ON and OFF”
The required voltage VCC2_8 for D400 is provided by N430
PUPLO2
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