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LMX2353 - PLLatinum Fractional N Single 2.5 GHz Frequency Synthesizer

Datasheet Summary

Description

The LMX2353 is a monolithic integrated fractional N frequency synthesizer, designed to be used in a local oscillator subsystem for a radio transceiver.

It is fabricated using National’s 0.5µ ABiC V silicon BiCMOS process.

Features

  • very low current consumption; typically 4.5 mA at 3.0V. The LMX2353 is available in a 16-pin TSSOP or a 16-pad CSP surface mount plastic package. Features n 2.7V.
  • 5.5V operation n Low Current Consumption ICC = 4.5 mA typ @ VCC = 3.0V n Programmable or Logical Power Down Mode ICC = 5 µA typ @ VCC = 3.0V n Modulo 15 or 16 fractional N divider Supports ratios of 1, 2, 3, 4, 5, 8, 15, or 16 n Programmable charge pump current levels 100 µA to 1.6 mA in 100 µA steps n Digital Filtered Lock D.

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Datasheet Details

Part number LMX2353
Manufacturer National Semiconductor
File Size 210.06 KB
Description PLLatinum Fractional N Single 2.5 GHz Frequency Synthesizer
Datasheet download datasheet LMX2353 Datasheet
Additional preview pages of the LMX2353 datasheet.

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Full PDF Text Transcription

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LMX2353 PLLatinum Fractional N Single 2.5 GHz Frequency Synthesizer PRELIMINARY June 1999 LMX2353 PLLatinum™ Fractional N Single 2.5 GHz Frequency Synthesizer General Description The LMX2353 is a monolithic integrated fractional N frequency synthesizer, designed to be used in a local oscillator subsystem for a radio transceiver. It is fabricated using National’s 0.5µ ABiC V silicon BiCMOS process. The LMX2353 contains dual modulus prescalers along with modulo 15 or 16 fractional compensation circuitry in the N divider. A 16/17 or 32/33 prescale ratio can be selected for the LMX2353. Using a fractional N phase locked loop technique, the LMX2353 can generate very stable low noise control signals for UHF and VHF voltage controlled oscillators (VCO’s).
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