Features Low in-band phase noise and low fractional spurs 12 bit or 22 bit selectable fractional modulus Up to 4th order programmable delta-sigma modulator Enhanced Anti-Cycle Slip Fastlock Circuitry Fastlock Cycle slip reduction Integrated timeout counters Digital lock detect output Prescalers allow wide range of N values RF PLL: 16/17/20/21 IF PLL: 8/9 or 16/17 Crystal Reference Frequency up to 110 MHz On-chip crystal reference frequency doubler. Phase Comparison Frequency up to 30 MHz Hardware and software power-down control Ultra low consumption: ICC = 4.1 mA (typical) Description The LMX2470 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using National Semiconductor's advanced BiCMOS process. With delta-sigma architecture, fractional spur compensation is achieved with noise shaping capability of the delta-sigma modulator and the inherent low pass filtering of the PLL loop filter. Fractional spurs at lower frequencies are pushed to higher frequencies outside the loop bandwidth. Unlike analog compensation, the digital feedback techniques used in the LMX2470 are highly resistant to changes in temperature and variations in wafer processing. With delta-sigma architecture, the ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. The higher the order, the more this energy can be spread to higher frequencies. The LMX2470 has a programmable modulator up to order four, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system. Programming is fast and simple. Serial data is transferred into the LMX2470 via a three line MICROWIRE interface (Data, Clock, Load Enable). Nominal supply voltage is 2.5 V. The LMX2470 features a typical current consumption of 4.1 mA at 2.5 V. The LMX2470 is available in a 24 lead 3.5 X 4.5 X 0.6 mm package. Applications Cellular Phones and Base Stations CDMA, WCDMA, GSM/GPRS, TDMA, EDGE, PDC Applications requiring fine frequency resolution Satellite and Cable TV Tuners WLAN Standards

LMX2470 WEBENCH® Design/Analyze/Build It RF-Side PLL Design Options Min Output Freq MHz >= 500 help Max Output Freq MHz <= 2600 help Channel Spacing KHz > 0 help AUX-Side PLL Design Options Min Output Freq MHz >= 75 help Max Output Freq MHz <= 800 help Channel Spacing KHz > 0 help Global Design Options Crystal Frequency MHz > 0 help Max Supply V > 0 help What is WEBENCH®?

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

Parameters Values Max PLL Freq 2600 MHz Min PLL Freq Undefined MHz Max Aux PLL Freq 800 MHz Min Aux PLL Freq Undefined MHz Normalized PLL Phase Noise -210 dBc/Hz Supply Current 4.1 mA Number of PLLs 2 PLL Type Delta-Sigma Fractional-N Min Supply Voltage 2.25 Volt Max Supply Voltage 2.75 Volt Fastlock Yes Temperature Min -40 deg C Temperature Max 85 deg C Power Consumption Undefined Watt PowerWise Rating 6 Undefined mW x ps /ch PowerWise Undefined

Datasheets

Title		Size	Date	Other Language
	LMX2470 2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL	453 Kbytes	9-Apr-03

Application Notes

Title		Size	Date	Other Language
	AN-1879: Application Note 1879 Fractional N Frequency Synthesis	511 Kbytes	10-Dec-08

Other Technical Documents

Title		Type	Date
	Delta Sigma PLLs Raise The Standard For Performance	App Note	2003-03-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMX2470SLEX/NOPB LMX2470SLEX RoHS Status	LAMINATE UCSP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 5000 DIGI-KEY Worldwide 0 FARNELL Europe and Asia 712 NEWARK Americas 712 RS COMPONENTS Worldwide 2	$2.10 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMX2470.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMX2470 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMX2470EVAL	2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$176.00 each	1
The LMX2470SLE Evaluation Board simplifies evaluation of the LMX2470 PLLatinum™ Delta Sigma 2.6 GHz Fractional-N PLL with 800 MHz Integer-N PLL. The board enables all performance measurements with no additional support circuitry. The evaluation board consists of a LMX2470SLE device, RF and IF VCO modules, and RF and IF loop filters built by discrete components. The SMA flange mount connectors are provided for external reference input, RF and IF VCO outputs, and the power and grounding connection. A cable assembly is bundled with the evaluation board for connecting to a PC through the parallel printer port. By means of MICROWIRE™ serial port emulation, the Code Loader software included can be run on a PC to facilitate the LMX2470 internal register programming for the evaluation and measurement. Contents: Evaluation Board PC Interface Cable Code Loader Software (CD-ROM) Code Loader Operating Instructions LMX2470 Product Data Sheet LMX2470SLE Evaluation Board Operating Instructions

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMX2470SLEX/NOPB LMX2470SLEX	22.578 22.578	LAMINATE UCSP	24	1 1	260 260	Detail	N/A	N/A	NSXYTT X2470 SLE

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMX2470.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMX2470 is located at RoHS Status.

Design Tools

Title	Size	Date
LMX2470 Evaluation Board Instructions
"LMX-Utility Evaluation Board: Add features and functionality to the standard evaluation boards, such as amplification, loop filter, and RF functions"

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMX2470SLEX	BICMOS8	2	15238	132	0	1812500	2	514301823

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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMX2470.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMX2470 is located at RoHS Status.