Features • 2.3V to 5.5V operation • Ultra low current consumption • 2.5V VCC JEDEC standard compatible • Programmable or logical power down mode: • ICC = 1 µA typical at 3V • Dual modulus prescaler: • LMX2306 8/9 • LMX2316/26 32/33 • Selectable charge pump TRI-STATE® mode • Selectable FastLock™ mode with timeout counter • MICROWIRE™ Interface • Digital Lock Detect Description The LMX2306/16/26 are monolithic, integrated frequency synthesizers with prescalers that are designed to be used to generate a very stable low noise signal for controlling the local oscillator of an RF transceiver. They are fabricated using National's ABiC V silicon BiCMOS 0.5µ process. The LMX2306 contains a 8/9 dual modulus prescaler while the LMX2316 and the LMX2326 have a 32/33 dual modulus prescaler. The LMX2306/16/26 employ a digital phase locked loop technique. When combined with a high quality reference oscillator and loop filter, the LMX2306/16/26 provide the feedback tuning voltage for a voltage controlled oscillator to generate a low phase noise local oscillator signal. Serial data is transferred into the LMX2306/16/26 via a three wire interface (Data, Enable, Clock). Supply voltage can range from 2.3V to 5.5V. The LMX2306/16/26 feature ultra low current consumption; LMX2306 - 1.7 mA at 3V, LMX2316 - 2.5 mA at 3V, and LMX2326 - 4.7 mA at 3V. The LMX2306/16/26 synthesizers are available in a 16-pin TSSOP surface mount plastic package. Applications • Portable wireless communications (PCS/PCN, cordless) • Wireless Local Area Networks (WLANs) • Cable TV tuners (CATV) • Pagers • Other wireless communication systems

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Typical Application click for larger image	Connection Diagram *click for larger image *click for larger image

Datasheet

Title		Size	Date	Other Language
	LMX2306/LMX2316/LMX2326 PLLatinum™ Low Power Frequency Synthesizer for RF Personal Communications LMX2306 550 MHz LMX2316 1.2 GHz LMX2326 2.8 GHz	342 Kbytes	15-Mar-04

Featured Application Notes

Title		Size	Date	Other Language
	AN-1865: Application Note 1865 Frequency Synthesis and Planning for PLL Architectures	151 Kbytes	6-Feb-09
	AN-1879: Application Note 1879 Fractional N Frequency Synthesis	511 Kbytes	10-Dec-08

More Application Notes

Title		Size	Date	Other Language
	AN-1879: Application Note 1879 Fractional N Frequency Synthesis	511 Kbytes	10-Dec-08
	AN-1865: Application Note 1865 Frequency Synthesis and Planning for PLL Architectures	151 Kbytes	6-Feb-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LMX2306TM/NOPB LMX2306TM RoHS	TSSOP	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 671 AVNET-EM Worldwide 69 DIGIKEY Worldwide 0 FARNELL Europe and Asia 1534 RS COMPONENTS Worldwide 87	$1.23 each at 1K+ pcs	rail of 92
LMX2306TMX/NOPB LMX2306TMX RoHS	TSSOP	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0 KEIKONG Asia Pacific 2500 NEWARK Americas 820	$1.23 each at 1K+ pcs	reel of 2500
LMX2306SLBX/NOPB LMX2306SLBX RoHS		Lifetime buy Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.21 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMX2306SLBX	LMX2531	National Semiconductor	30 Nov 2009
LMX2306SLEX	LMX2531	National Semiconductor	30 Nov 2009
LMX2306TM	LMX2485E	National Semiconductor	30 Nov 2009
LMX2306TMX	LMX2531	National Semiconductor	30 Nov 2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMX2306SLBX	ABIC	0	16313	0	0	2828000	2	802452721
LMX2306TM	ABIC	0	16313	0	0	2828000	2	802452721
LMX2306TMX	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
LMX2306SLBX	LMX2531	National Semiconductor	30 Nov 2009
LMX2306SLEX	LMX2531	National Semiconductor	30 Nov 2009
LMX2306TM	LMX2485E	National Semiconductor	30 Nov 2009
LMX2306TMX	LMX2531	National Semiconductor	30 Nov 2009