User Guide

NEM-2
System Module and User Interface CCS Technical Documentation
Page 22 Copyright Nokia. All rights reserved. Issue 1 07/03
Table 3: AC and DC Characteristics of DCT4 RF-Baseband Analogue Signals
Signal name From To Parameter Min Typ Max Unit Function
VCTCXO VCTCXO UPP Frequency 13 26 MHz High stability clock
signal for the logic
circuits, AC cou-
pled. Distorted sine-
wave e.g. sawtooth.
Signal amplitude 0.2 0.8 2.0 Vpp
Input Impedance 10 kΩ
Input Capacitance 10 pF
Harmonic Content -8 dBc
Clear signal window
(no glitch)
200 mVpp
Duty Cycle 40 60 %
VCTCXOGnd VCTCXO UPP DC Level 0 V Ground for refer-
ence clock
RXI/RXQ HELGO UEM Voltage swing
(static)
1.35 1.4 1.45 Vpp Received demodu-
lated IQ signals
DC level 1.3 1.35 1.4 V
I/Q amplitude mis-
match
0.2 dB
I/Q phase mismatch -5 5 deg
TXIP / TXIN UEM HELGO Differential voltage
swing (static)
2.15 2.2 2.25 Vpp Programmable volt-
age swing.
Programmable com-
mon mode voltage.
Between TXIP-TXIN
DC level 1.17 1.20 1.23 V
Source Impedance 200 W
TXQP / TXQN UEM HELGO Same spec as for TXIP / TXIN
AFC UEM
(AFCOUT)
VCTCXO Voltage Min
Max
0.0
2.4
0.1
2.6
V Automatic fre-
quency control sig-
nal for VCTCXO
Resolution 11 bits
Load resistance
and capacitance
1
100
kΩ
nF
Source Impedance 200 W
TxC UEM
(AUX-
OUT)
HELGO Voltage Min
Max
2.4
0.1 V Transmitter power
level and ramping
control
Source Impedance 200 W