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LMX2353 Datasheet Pllatinum Fractional N Single 2.5 Ghz Frequency Synthesizer

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LMX2353 PLLatinum Fractional N Single 2.5 GHz Frequency Synthesizer PRELIMINARY June 1999 LMX2353 PLLatinum™ Fractional N Single 2.

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 pensation circuitry in the N divider.

Key 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.

LMX2353 Distributor