Features • RF operation up to 2.5 GHz • 2.7V to 5.5V operation • Digital & Analog Lock Detect • 32/33 Dual modulus prescaler • Excellent Phase Noise • Internal balanced, low leakage charge pump • Pin Compatible to LMX2323 Description The LMX2346/7 are high performance frequency synthesizers with an integrated 32/33 dual modulus prescaler. The LMX2346 is designed for RF operation up to 2.0 GHz. The LMX2347 is designed for RF operation up to 2.5 GHz. Using a proprietary digital phase locked loop technique, the LMX2346/7 generates very stable, low noise control signals for UHF and VHF voltage controlled oscillators. Serial data is transferred into the LMX2346/7 via a three-line MICROWIRE interface (DATA, LE, CLOCK). Supply voltage range is from 2.7V to 5.5V. The charge pump provides 4 mA output current. The LMX2346/7 are manufactured using National's 0.5µ ABiC V silicon BiCMOS process and is available in 16-pin TSSOP and 16-pin CSP packages. Applications • Cellular DCS/PCS/3G infrastructure equipment • Wireless Local Area Networks (WLANs) • Other wireless communication systems

Also Recommended LMX2347▲ Higher Maximum Operating Frequency. MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

	Block Diagram click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LMX2346/LMX2347 PLLatinum™ Frequency Synthesizer for RF Personal Communications LMX2346 2.0 GHz LMX2347 2.5 GHz	606 Kbytes	1-Jun-04

Featured Application Notes

Title		Size	Date	Other Language
	AN-1000: AN-1000 A Fast Locking Scheme for PLL Frequency Synrhesizers	115 Kbytes	4-Oct-04

More Application Notes

Title		Size	Date	Other Language
	AN-1052: Application Note 1052 Noise Floor Measurement of PLL Frequency Synthesizers	43 Kbytes	15-Jan-98
	AN-1000: AN-1000 A Fast Locking Scheme for PLL Frequency Synrhesizers	115 Kbytes	4-Oct-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LMX2346TM/NOPB LMX2346TM RoHS	TSSOP	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 143 AVNET-EM Worldwide 240 DIGIKEY Worldwide 154 NEWARK Americas 166 RS COMPONENTS Worldwide 57	$1.50 each at 1K+ pcs	rail of 92
LMX2346TMX/NOPB LMX2346TMX RoHS	TSSOP	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.50 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMX2346SLBX	NONE	NONE	19 Jun 2009
LMX2346TM	LMX2531	National Semiconductor	30 Nov 2009
LMX2346TMX	LMX2531	National Semiconductor	30 Nov 2009

Design Tools

Title	Size	Date
LMX2346 Evaluation Board Instructions	898 Kbytes	6-Jan-2004
"LMX-Utility Evaluation Board: Add features and functionality to the standard evaluation boards, such as amplification, loop filter, and RF functions"

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMX2346SLBX	ABIC	0	16313	0	0	2828000	2	802452721
LMX2346TM	ABIC	0	16313	0	0	2828000	2	802452721
LMX2346TMX	ABIC	0	16313	0	0	2828000	2	802452721

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.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMX2346SLBX	NONE	NONE	19 Jun 2009
LMX2346TM	LMX2531	National Semiconductor	30 Nov 2009
LMX2346TMX	LMX2531	National Semiconductor	30 Nov 2009