Specifications

Table Of Contents
MAINTENANCE
Page 122 MRC-565 Packet Data Radio Operations & Maintenance
The regulator feeds a linear 5V regulator and two additional switching regulators each with three
outputs.
6.2.6.2 CF Switching Regulator
A three output switching regulator is used to generate the three voltages that power the Cold Fire
Processor and its peripheral devices. The three voltage are:
3.3V Powers CF54455 I/O, CPLD, RS232 interfaces, Flash Memory, Ethernet
Controller
1.8V Powers Dynamic RAM
1.5V Powers MCF 54455 Core
6.2.6.3 DSP Switching Regulator
A three output switching regulator is used to generate the three voltages that power all circuitry
associated with the Receiver and Exciter circuitry. The three voltages are:
3.6V Powers FPGA and DSP I/O, Rx Clock synthesizer, RF Pre Amps, TCXO, and
QDUC circuit.
2.0V Powers the ADC circuit, the FPGA Core (1.2V), and the DSP Core (1.6V)
1.8V Powers QDUC RF Output
There are several additional linear regulators that are used to filter the switching noise on the
DSP Switching Regulator.
The total current in the receive mode is typically 120- 140 ma. This current can drop to 70 ma by
using the low power modes controlled by the CF Processor.