User Guide

NSB-5
System Module PAMS Technical Documentation
Page 86 Nokia Mobile Phones Ltd. Issue 1 03/01
Transmit Power Timing
Interfacing
The interfacing between RF and BB is comprised of the signals stated below:
SCLK Clock for the PLL Serial Programming (3.25 MHz)
SDATA Data for the PLL Serial Programming
SENA1 Latch Enable for the PLL Serial Programming
FRACTRL Front-end Amplifier Control - Turns the gain in the LNA on and off
BAND_SEL Band Selection - Selects between GSM 900 and GSM 1900 (i.e., it turns on the respec-
tive mixers and LNAs in the CRFU3
RXC Receiver Gain Control - The control voltage for the AGC amplifier
AFC Automatic Frequency Control Signal for the VCTCXO
RFC A high stability clock signal for the logic circuits (13 MHz)
RXINN, RXINP The differential RX signals to baseband
TXC Transmitter power control signal, controls the shape of the burst
TXP Transmitter power enable
TXIN, TXIP Differential in-phase TX baseband signals for the RF modulator
TXQN, TXQP Differential Quadrature-phase TX baseband signalsss for the RF modulator
VTX Supply voltage for the TX chain, which also is used for control of the GSM 1900 TX/RX
switch, together with BAND_SEL and VRX_1
VRX_1 Supply voltage for a part of the RX chain, which also is used for control of the GSM
1900 TX/RX switch
Pout
TXC
TXP
542.8 us
6.5...59 us
0...59 us
0...58 us
TXPWR
150 us 50 us
Transmitter Timing Diagram