User Guide

PAMS Technical Documentation 3. System Module
NSD-5
Issue 1 05/02 Nokia Corporation Page 17
MAD4/RF Receiver and Transmitter Interface
Figure 9: MAD/RF TX/RX interface
Functional Description
Figure 9 shows the interface between MAD4 and RF receiver and transmitter. It includes
transmitter enable/disable, and RF power controlling. Some of the control signals have
2.8 CMOS level, while others have a PDM signal, which can be used to control RF behav-
ior. The MAD4 PDM output is 2.8 V CMOS digital signal with pulse duration modulated
with 9.6 MHz clock. Baseband provides low pass filter to smooth the signal and avoid
digital noise into RF ground plane.
Signal Definitions
TIF_EN
RF_TX_GATE_P
Signal from MAD4 pin B14 (RF_TX_GATE_P) to RF transmitter to activate the bias of cel-
High Low Load impedance Polarity Rising Time Filtering
Vdd - 0.6V 0 - 0.5V Min: 20k
Typ: 200k
Low: Disable < 25 ns
(10% - 90%)
None