Clock Distribution; Rfclk (19.2 Mhz Analog) - Nokia RH-44 Series Troubleshooting - Bb

RH-44
Troubleshooting — BB
Regulator
VCORE (dc/dc)
VIO
VFLASH1
VFLASH2
VANA
VSIM
Regulator
VR1A
VR1B
VR2
VR3
VR4
VR5
VR6
VR7
A charge pump used by VR1A is constructed around UEM. The charge pump works with a
1.2 MHz oscillator and gives a 4.75 V regulated output voltage to RF.

Clock Distribution

RFClk (19.2 MHz Analog)

The main clock signal for the baseband is generated from the voltage and temperature
controlled crystal oscillator VCTCXO (G501). This 19.2 MHz sine wave clock signal is fed
to RFCLK pin of UPP. (See Figure 7 for the waveform.)
Page 14
Table 1: Baseband regulators
Maximum
Vout (v)
current (mA)
300 1.5
150 1.8
70 2.78
40 2.78
80 2.78
25 3.0
Table 2: RF regulators
Maximumcurrent
Vout (v)
(mA)
10 4.75
10 4.75
100 2.78
20 2.78
50 2.78
50 2.78
50 2.78
45 2.78
Nokia Corporation
CCS Technical Documentation
Notes
Output voltage selecta ble 1.0V/1.3V/1.5V/1.8V
Power up default 1.5V
Enabled always except during power off mode
Enabled always except during power off mode
Enabled only when active cover is detected
Enabled only when the system is awake (off
during Sleep and Power off modes)
Enabled only when SIM card is used
Notes
Enabled when the receiver is on
Enabled when the transmitter is on
Enabled when the transmitter is on
Enabled when SleepX is high
Enabled when the receiver is on
Enabled when the receiver is on
Enabled when the transmitter is on
Enabled when the receiver is on
Confidential Issue 1 04/2003