Freescale Semiconductor, Inc.
PLL Tuned UHF Transmitter Module
16.2 Introduction
This section describes the integrated radio frequency (RF) module. This
module integrates an ultra high frequency (UHF) transmitter offering
these key features:
•
•
•
•
•
Phase-lock loop (PLL) tuned with no adjustments required
1.9-V to 3.6-V operation
Ultra low sleep mode current
315 MHz, 434 MHz, and 868 MHz by crystal choice
Amplitude shift keying (ASK) and frequency shift keying (FSK)
modulation
•
High level of integration
Architecture of the module is described in Figure 16-1.
BS
MODE
POWER-UP
PLLEN
& CONTROL
PLL ENABLE
DATA
AM MODULE
FM MODULE
OP1
AMP
VCO
GND
DIVIDE
BY N
REXT
FM
MODULE
LOCK
DETECT
REFERENCE
OSCILLATOR
XTAL1
PFD
PFD
XTAL0
DIVIDE
BY C
LOOP
UPCLK
FILTER
Figure 16-1. Integrated RF Module Block Diagram
Advance Information
222
MC68HC908RFRK2
MOTOROLA
PLL Tuned UHF Transmitter Module
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