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 microSMD package. Its small size and low supply current make it ideal for portable applications. Applications • Mobile handsets • PDAs • Portable Equipment

Typical Application2 MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LMH2190 Quad Channel 27 MHz Clock Tree Driver with I 2 C Interface	552 Kbytes	7-Oct-09

Featured Application Notes

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

More Application Notes

Title		Size	Date	Other Language
	AN-1681: Application Note 1681 Design Migration from the LM1881 to the LMH1980	143 Kbytes	2-Aug-07	日本語
	AN-1599: Application Note 1599 LMH1981 Evaluation Board Instruction Manual	503 Kbytes	11-Feb-09	日本語
	AN-1618: Application Note 1618 LMH1980 Evaluation Board Instruction Manual	674 Kbytes	19-Jul-07	日本語

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH2190TM-38	CMOS7	0	18406	0	0	1089000	4	309006723
LMH2190TMX-38	CMOS7	0	18406	0	0	1089000	4	309006723

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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