Clock Distribution - Nokia 7088 Troubleshooting Manual

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Rating
Regulator
Current
MSMC 150 mA
MSMA 150 mA
MSMP 150 mA
RUIM 150 mA
TCXO 50 mA
Table 2 includes the PM6610 regulators for the RF.
Rating
Regulator
Current
RFRX 150 mA
RFTX 150 mA

Clock Distribution

The MSM derives its internal clock from two clock inputs, TCXO and SLEEP Clock.
The main clock signal for the base band generates from TCXO.
(Temperature-compensated crystal oscillator). The MSM's TCXO clock input
supports the frequency 19.2 MHz. An integrated PLL and digital divider inside the
MSM are used to create the required clock for the system.
The SLEEP Clock provides a 32.768 kHz clock source to drive the MSM controller in
sleep mode. At this mode, most of the MSM is powered down and the TCXO is
disabled.
The PM includes several clock circuits (Figure 4), whose outputs are used for
general housekeeping, MSM and RF functions within the mobile terminal system.
Issue 1 12/2006 © 2006 Nokia Corporation
Baseband Description and Troubleshooting
Voltage Notes
1.88 V Always enabled except during power-off mode
Enabled only when the system is powered on
2.60 V
(Off during sleep and power-off modes)
2.95 V Always enabled except during power-off mode
3.00 V Enabled only when RUIM card is used
Enabled only when the system is powered on
2.8 V
(Off during sleep and power-off modes)
Table 1: Base band Regulators
Voltage Notes
2.60 V Enabled when the transmitter is on
2.60 V Enabled when the receiver is on
Table 2: RF Regulators
Company Confidential
7088 (Flower)
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