Motorola V2260 Instruction Manual download pdf (Page 19)

19

Theory of Operation

Transmit Audio - CDMA Mode

In CDMA mode, the digitized TX audio is

processed by a CELP variable rate vocoder,

U1100. The digital signal is then routed

through microprocessor U1100 and pro-

cessed by the CDMA Modem IC, U1100,

which produces the 1.2288 Mb/sec. CDMA

data

stream. This stream is then converted to ana-

log OQPSK signals (TX I, TX Q) by D/A

U1900. The TX I and TX Q signals are sent

to the IF/Synthesizer IC U700 which modu-

lates the 154.8 MHz TX offset VCO.

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