FLEX Paging RF/IF Frequency Synthesizer Receiver

This document contains the information of a frequency synthesized receiver prototype for FLEX roaming paging platform. This FLEX paging receiver board is a high performance RF/IF front–end for using in FLEX roaming pager. This board employs Motorola’s high frequency transistors MMBR941LT1, a M–ary FSK FM IF receiver MC2800 as well as NPC’s phase lock loop SM5166AV as the c ore. The whole module inc ludes a LNA, a voltage–controlled oscillator, a frequency multiplier, a PLL, a mixer and a FSK IF receiver.

Features:

• Input RF Frequency Range: 278 to 286 MHz

• Input frequency channel spacing: 25.0 kHz

• Excellent Sensitivity: –123.0 dBm

• IF Receiver Operating Voltage: 1.15 to 1.7 V

• PLL Operating Voltage: 3.0 to 3.3 V

• Total Current Consumption:

4.3 mA @ VCC = 1.15 V,

0.08 mA @ VDD = 3.0 V

• Switchable Bit–Rate Filter to Support All Kinds of FLEX Data Rate