User Guide

CC Technical Documentation Troubleshooting - Baseband

RM-11

The RM-11 baseband is powered from five different UEM regulators:

Table 2 includes the UEM voltage regulators used by the RF.

A charge pump used by VR1A is constructed around the UEM. The charge pump works

with Cbus (1.2 MHz Clk) and gives a 4.75 V regulated output voltage to the RF.

Clock Distribution

RFClk (19.2 MHz Analog)

The baseband’s main clock signal is generated from the VCTCXO (G503). This 19.2 MHz

clock signal is generated at the RF and fed to the UPP’s RFCLK pin.

Table 1: RM-11 Baseband Regulators

Regulator

Maximum

current (mA)

Vout (V) Notes

VCORE

DD/DC

300 1.5 Output voltage selectable 1.0V/1.3V/1.5V/1.8V

Default power at power-up is 1.5V

VIO 150 1.8 Enabled always except during power-off mode

VFLASH1 70 2.78 Enabled always except during power-off mode

VFLASH2 40 2.78 Enabled only when data cable is connected

VANA 80 2.78 Enabled only when the system is awake (off during sleep

and power-off modes)

VSIM 25 3.0 Not used

Table 2: RM-11 RF Regulators

Regulator

Maximum

current (mA)

Vout (V) Notes

VR1A 10 4.75 Enabled when the receiver is on

VR1B 10 4.75 Enabled when the transmitter is on

VR2 100 2.78 Enabled when the transmitter is on

VR3 20 2.78 Enabled when SleepX is high

VR4 50 2.78 Enabled when the receiver is on

VR5 50 2.78 Enabled when the receiver is on

VR6 50 2.78 Enabled when the transmitter is on

VR7 45 2.78 Enabled when the receiver is on