User's Manual

APPLICANT: MOTOROLA EQUIPMENT TYPE: ABZ89FC3797
User / Operational Manual
Functional Description / Operation of Modules (Draft)
EXHIBIT D1-6
Communications with Station Control Module
Data communications between the Exciter and the Station Control Module microprocessor (μP) is performed via a
Serial Peripheral Interface (SPI) bus. This bus allows the SCM μP to send data to the synthesizer PLL IC (to
select frequency) and to read the ADC Converter IC.
ADC Converter Circuitry
Analog signals from various strategic operating points throughout the Exciter board are fed to an ADC converter,
which converts them to a digital signal and, upon request by the Station Control Module, outputs the signal to the
Station Control Module via the Serial Peripheral Interface (SPI) bus.
Voltage Regulation/Filtering Circuitry
The voltage regulator circuitry consists of a +5V, +3.3V and +2.775V regulators that supplies power to the digital
circuitry and the PLL. The +12V regulator is used to supply power to the VCO and the +10V supplies power to the
final device.