User Guide

PAMS Technical Documentation System Module
NSB-5
Issue 1 03/01 Nokia Mobile Phones Ltd. Page 77
Synthesizer Blocks
VC(TC)XO, Reference Oscillator
Table 38: VC(TC)XO
TXP input voltage, LOW 0.5 V
TXP input voltage, HIGH 2.4 V
Opaout voltage if TXP=low & bit
S18in control register is 0
0V
opaout-output current driving capa-
bility
4mA
OP1 output impedance 50 ohms
Offset of OP1 op.amp -40 +40 mV
Temperature coefficient of the offset
voltage
30 µV/C
TXC and TXP input resistance 18 kohms
TXC and TXP input capacitance 4 pF
Bandwidth 6 MHz
Open loop gain 20 dB
Closed loop gain 15 dB
Closed loop - 3 dB BW 70 kHz
Phase margin 45 60 degrees
Gain margin 30 dB
Parameter Minimum
Typical/
Nominal
Maximum Unit/Notes
Center frequency 13 MHz
Operating temperature range -20 +75 C
Storage temperature -35 +85 C
Output voltage swing 800 mVpp
Load resistance 2 kohms
Load capacitance 10 pF
Frequency tolerance @ 25
o
C
-1.0 +1.0 ppm
Frequency tolerance after reflow
(@ 25
o
C )
-2.0 +2.0 ppm
Parameter Minimum
Typical/
Nominal
Maximum Unit/Notes