HomedatasheetLMX2354

LMX2354 Datasheet

Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
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Description

The LMX2354 is part of a family of monolithic integratedfractional N/Integer N frequency synthesizers designed to beused in a local oscillator subsystem for a radio transceiver. Itis fabricated using National’s 0.5 μ ABiC V silicon BiCMOSprocess. The LMX2354 contains quadruple modulus prescalersalong with modulo 15 or 16 fractional compensationcircuitry in the RF divider. The LMX2354 provides a continuousdivide ratio of 80 to 32767 in 16/17/20/21(1.2 GHz–2.5 GHz) fractional mode and 40 to 16383 in8/9/12/13 (550 MHz–1.2 GHz) fractional mode. The IF circuitryfor the LMX2354 contains an 8/9 prescaler, and is fullyprogrammable. Using a fractional N phase locked loop technique,the LMX2354 can generate very stable low noisecontrol signals for UHF and VHF voltage controlled oscillators(VCOs).For the RF PLL, a highly flexible 16 level programmablecharge pump supplies output current magnitudes from 100μA to 1.6 mA. Two uncommitted CMOS outputs can be usedto provide external control signals, or configured to FastLockmode. Serial data is transferred into the LMX2354 via a threewire interface (Data, LE, Clock). Supply voltage can rangefrom 2.7V to 5.5V. The LMX2354 family features very lowcurrent consumption; typically LMX2354 (2.5 GHz) — 7.0mA. The LMX2354 are available in a 24-pin TSSOP surfacemount plastic package and 24-pin CSP. LMX2354 Features • Pin compatible/functional equivalent to the LMX2350• Enhanced Low Noise Fractional Engine• 2.7V to 5.5V operation• Low current consumptionLMX2354: ICC = 7 mA typical at 3V• Programmable or logical power down mode:ICC = 5 μA typical at 3V• Modulo 15 or 16 fractional RF N divider supports ratiosof 1, 2, 3, 4, 5, 8, 15, or 16• Programmable charge pump current levelsRF 100 μA to 1.6 mA in 100 μA stepsIF 100 μA or 800 μA• Digital filtered lock detect• Available in 24-pin TSSOP and 24-pin CSP LMX2354 Applications • Portable wireless communications (PCS/PCN, cordless)• Dual mode cellular telephone systems• Zero blind slot TDMA systems• Spread spectrum communication systems (CDMA)• Cable TV Tuners (CATV)
Features

Parameters

[{"Name":"Number of Circuits","Value":"1"},{"Name":"Ratio - Input:Output","Value":"3:3"},{"Name":"Frequency - Max","Value":"2.5GHz, 550MHz"},{"Name":"Voltage - Supply","Value":"2.7 V ~ 5.5 V"},{"Name":"Operating Temperature","Value":"-40°C ~ 85°C"},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

Manufacturer information

ROHM
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