User Guide

NSD-5
3. System Module PAMS Technical Documentation
Page 26 Nokia Corporation Issue 1 05/02
(1) Center on Vref = 1.244V
Table 4: Electrical characteristics of the CAFE/RF interface signals
RX/CAFE CDMA RX Interface
The digital receive channel consists of two equal branches (RXI, RXQ). Each branch has
differential input and the signal is AC coupled. See Table 5 for details.
Signal Parameter Min Typ Max Description
CLK19M22 Freq (MHz) 19.2 +/- 2.5 ppm 19.2MHz system clock input from
VCTCXO to clock squaring circuit
Phase
Noise (dBc/Hz)
10Hz 100Hz 1000Hz
-70 -110 -130
Settling Time 5ms
TX_IP Level (Vpp)
Noise (uVrms)
0.97 1.0 1.03
<450
CDMA TX filter I channel differen-
tial output to TIF I/Q modulator
input
TX_IN
Level (Vpp)
Noise (uVrms)
0.97 1.0 1.03
<450
CDMA TX filter I channel differen-
tial output to TIF I/Q modulator
input
TX_QP Level (Vpp)
Noise (uVrms)
0.97 1.0 1.03
<450
CDMA TX filter Q channel differen-
tial output to TIF I/Q modulator
input
TX_QN Level (Vpp)
Noise (uVrms)
0.97 1.0 1.03
<450
CDMA TX filter Q channel differen-
tial output to TIF I/Q modulator
input
RX_IP Level (mVpp)
Noise Figure (dB)
48
(1)
20 25
CDMA RX filter I channel input
from RIF I/Q demodulator output
RX_IN Level (mVpp)
Noise Figure (dB)
48
(1)
20 25
CDMA RX filter I channel differen-
tial input from RIF I/Q demodulator
output
RX_QP Level (mVpp)
Noise Figure (dB)
48
(1)
20 25
CDMA RX filter Q channel differen-
tial input from RIF I/Q demodulator
output
RX_QN Level (mVpp)
Noise Figure (dB)
48
(1)
20 25
CDMA RX filter Q channel differen-
tial input from RIF I/Q demodulator
output
For I and Q channels Symbol Min Typ Max Unit
Passband frequency (-0.5 dB point) fpb 620 630 640 kHz
Stopband frequency fsb 900 kHz
Max differential input voltage
range in passband
VI
pb
20 mVpp