LMX2350 - 2.5 GHz/550 MHz PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer [Life-time buy]
Datasheet Packaging Samples & Pricing Reliability Design Tools Application Notes Knowledge Base

Features
Applications
2.7 V to 5.5 V operation
Low current consumption LMX2350: Icc = 6.75mA typ at 3v LMX2352: Icc = 5.00mA typ at 3v
Programmable or logical power down mode Icc = 5 µA typ at 3v
Modulo 15 or 16 fractional RF N divider supports ratios of 1, 2, 3, 4, 5, 8, 15, or 16
Programmable charge pump current levels RF 100µA to 1.6mA in 100µA steps IF 100µA or 800 µA
Digital filtered lock detect

 

General Description


The LMX2350/2352 is part of a family of monolithic integrated fractional N/ Integer N frequency synthesizers designed to be used in a local oscillator subsystem for a radio transceiver. More...


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)

Also Recommended


LMX2485Delta-Sigma For Lowest Phase Noise, Lowest Spurs, & Fastest Lock Time
LMX2354Lower Phase Noise, Lower Spurs, & Faster Lock Time
LMX2364Even Lower Phase Noise, Lower Spurs, & Faster Lock Time
LMX2470Delta-Sigma For Lowest Phase Noise, Low Spurs, & Fastest Lock Time
Additional Resources
Design Tools

Application Notes



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LMX2350/LMX2352 PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer 405
Kbytes
5-Dec-01 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LMX2350TMTSSOP24NOPB1260RoHS N/A Lifetime buyN/A
 
Buy Now
1K+$2.96rail
of
61
NSUZXYTT
LMX2350
TMDD
6 weeks1000
LMX2350TMXTSSOP24NOPB1260RoHS N/A Lifetime buyN/A
 
Buy Now
1K+$2.96reel
of
2500
NSUZXYTT
LMX2350
TMDD
16 weeks3000

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LMX2350SLBX
LMX2350TM
NATIONAL SEMICONDUCTOR
25 Oct 2005
LMX2350TM
LMX2531
National Semiconductor
30 Nov 2009
LMX2350TMX
LMX2531
National Semiconductor
30 Nov 2009

General Description


The LMX2350/2352 is part of a family of monolithic integrated fractional N/ Integer N frequency synthesizers 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 LMX2350/2352 contains dual modulus prescalers along with modulo 15 or 16 fractional compensation circuitry in the RF divider. A 16/17 or 32/33 prescale ratio can be selected for the LMX2350, and the LMX2352 provides 8/9 or 16/17 prescale ratios. The IF circuitry for both the LMX2350 and LMX2352 contains an 8/9 prescaler, and is fully programmable. Using a fractional N phase locked loop technique, the LMX2350 /52 can generate very stable low noise control signals for UHF and VHF voltage controlled oscillators (VCOs).

For the RF PLL, a highly flexible 16 level programmable charge pump supplies output current magnitudes from 100µA to 1.6mA. Two uncommitted CMOS outputs can be used to provide external control signals, or configured to FastLock™ mode. Serial data is transferred into the LMX2350/2352 via a three wire interface (Data, LE, Clock). Supply voltage can range from 2.7 V to 5.5 V. The LMX2350/ LMX2352 family features very low current consumption; typically LMX2350 (2.5 GHz) 6.5 mA, LMX2352 (1.2 GHz) 4.75 mA at 3.0V. The LMX2350/2352 are available in a 24-pin TSSOP and 24-pin CSP surface mount plastic package.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LMX2350TMABIC0163130028280002802452721
LMX2350TMXABIC0163130028280002802452721

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools


TitleSize in Kbytes Date Click link below to Download    
PLL Codeloader Driver Software     View    
"LMX-Utility Evaluation Board: Add features and functionality to the standard evaluation boards, such as amplification, loop filter, and RF functions"     View    

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Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1119: AN-1119 Voltage Doubler Design and Analysis 92
Kbytes
1-May-04 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1821: Application Note 1821 CPRI Repeater System 1497
Kbytes
15-May-08 Download
AN-1865: Application Note 1865 Frequency Synthesis and Planning for PLL Architectures 151
Kbytes
6-Feb-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 8-Nov-2009]