Features 1 input clock, 4 output clocks Supports both square or sine wave input 1.8V square wave clock outputs Skewed clock outputs Independent clock request High isolation of supply noise to clock input High output to output Isolation Output Drive up to 50 pF EMI controlled output edges and EMI filtering Integrated 1.8V Low-Dropout Regulator Low Output Noise Voltage 10 mA load current I 2C Configurable up to 400 kHz (Fast Mode) Ultra low standby current VBAT range = 2.5V to 5.5V Description The LMH2190 is a quad channel configurable clock tree driver which supplies a digital system clock to peripherals in mobile handsets or other applications. It provides a solution to clocking issues such as limited drive capability for fanout or longer traces, protection of the master clock from varying loads and frequency pulling effects, isolation buffering from noisy modules, and crosstalk isolation. It has very low phase noise which enables it to drive sensitive modules such as Wireless LAN and Bluetooth. The LMH2190 can be clocked up to 27 MHz, and has an independent clock request pin for each clock output which allows the peripheral to control the clock. It features an integrated LDO which provides an ultra low noise voltage supply with 10 mA external load current which can be used to supply the TCXO or other clock source. The I 2C serial interface can be used to override the default configuration of the device to optimize the LMH2190 for the application. Some of these programmable features include setting the polarity of both the clock and the clock request inputs. In addition, the clock outputs have programmable output drive current to optimize for the connected load. EMI switching noise can be controlled by configuring output drive and skew settings. The LMH2190 quad clock distributor is offered in a tiny 1.615mm x 1.615mm 16 bump micro SMD package. Its small size and low supply current make it ideal for portable applications. Applications Mobile handsets PDAs Portable Equipment

Typical Application2

Typical Application *click for larger image Typical Application2	Block Diagram *click for larger image Block Diagram2
Typical Performance *click for larger image Curve Additive PhaseNoise

Parameters Values Output Type Digital Max Output Clock Freq 27 MHz Min Output Clock Freq 0.032 MHz Phase Noise -152 dBc/Hz Phase Noise Conditions 26 MHz @ 10kHz offset RMS Jitter 0.1 ps LDO Yes Channels 4 Channels Supply Current Per Channel 0.75 mA Supply Min 2.5 Volt Supply Max 5.5 Volt Special Features I2C Interface; Independent Shutdown Temperature Min -20 deg C Temperature Max 85 deg C

Datasheets

Title		Size	Date	Other Language
	LMH2190 Quad Channel 27 MHz Clock Tree Driver with I2C Interface	553 Kbytes	29-Aug-11

Application Notes

Title		Size	Date	Other Language
	AN-1966: Application Note 1966 Evaluation Board for the LMH2190	1816 Kbytes	4-Aug-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH2190TM-38/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 250 DIGI-KEY Worldwide 408 MOUSER Worldwide 200 TAYLOR Americas 250	$1.40 each at 1K+ pcs	reel of 250
LMH2190TMX-38/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.40 each at 1K+ pcs	reel of 3000

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 LMH2190.

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 LMH2190 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH2190TMEVAL/NOPB	Evaluation Board for the LMH2190	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	N/A
Description: The LMH2190EVAL board helps evaluating the LMH2190 Quad Channel 26 MHz Clock Tree Driver with I2C. It is designed such that it gives maximum flexibility in evaluating the LMH2190 in various configurations. The LMH2190 provides a digital system clock to peripheral devices in mobile handsets. It provides a solution to clocking issues such as limited drive capability for fan-out or longer traces, protection of the master clock from varying loads and frequency pulling effects, isolation buffering from noisy modules, and crosstalk isolation. It has very low phase noise which enables it to drive sensitive modules such as Wireless LAN and Bluetooth. Contents: LMH2190 Evaluation Board LMH2190 Datasheet Application Note AN-1966 Evaluation Board for the LMH2190

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
LMH2190TM-38/NOPB	3.533	MICRO SMD	16	1	260	Detail	Download	N/A	XYTT I AA
LMH2190TMX-38/NOPB	3.533	MICRO SMD	16	1	260	Detail	Download	N/A	XYTT I AA

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 LMH2190.

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 LMH2190 is located at RoHS Status.

CAD Symbols and Models Download LMH2190 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH2190TM-38	CMOS7	0	21301	0	0	1584000	3	449464325
LMH2190TMX-38	CMOS7	0	21301	0	0	1584000	3	449464325

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 LMH2190.

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 LMH2190 is located at RoHS Status.