LMX2335 Datasheet PDF | National Semiconductor

National Semiconductor LMX2335

The LMX2335, LMX2336 and LMX2337 are monolithic, integrated dual frequency synthesizers, including two high frequency prescalers, and are designed for applications requiring two RF phase-lock loops. They are fabricated using National’s ABiC IV silicon BiCMOS process. The LMX2335/36/37 contains two dual modulus prescalers.

Part No.	LMX2335
Datasheet	LMX2335 Download
Manufacturer	National Semiconductor
Description	PLLatinum Dual Frequency Synthesizer
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FEATURES

n 2.7V to 5.5V operation n Low current consumption n Selectable powerdown mode: ICC = 1 µA (typ) n Dual modulus prescaler: 64/65 or 128/129 n Selectable charge pump TRI-STATE ® mode n Selectable charge pump current levels n Selectable FastLock™ mode

GENERAL DESCRIPTION

A 64/65 or a 128/129 prescaler can be selected for each RF synthesizer. A second reference divider chain is included in the IC for improved system noise. LMX2335/36/37, which employ a digital phase locked loop technique, combined with a high quality reference oscillator and loop filters, provide the tuning voltages for voltage controlled oscillators to generate very stable low noise RF local oscillator signals. Serial data is transferred into the LMX2335/36/37 via a three wire interface (Data, Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2335/36/37 feature very low current consumption; LMX2335/37 −10 mA at 3V, LMX2336 −13 mA at 3V. The LMX2335/37 are available in

APPLICATIONS

n Cellular tel...