LMH2190 - Quad Channel 27 MHz Clock Tree Driver with I2C Interface
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Knowledge Base

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

General 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. More...


Applications

•Mobile handsets
•PDAs
•Portable Equipment
  Typical Application
*click for larger image

Typical Application2

ParametersValues
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


Typical Performance

*click for larger image

Curve Additive PhaseNoise
  Block Diagram
*click for larger image

Block Diagram2

Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LMH2190 Quad Channel 27 MHz Clock Tree Driver with I 2 C Interface 552
Kbytes		 7-Oct-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LMH2190TMEVALEvaluation Board for the LMH2190Full productionN/A
 
Buy Now 		 CALLN/A-
N/AN/A
LMH2190TM-38MICRO SMD16NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.40reel
of
250		XYTT
I AA
6 weeksN/A
LMH2190TMX-38MICRO SMD16NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.40reel
of
3000		XYTT
I AA
6 weeksN/A

General 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.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LMH2190TM-38CMOS70184060010890004309006723
LMH2190TMX-38CMOS70184060010890004309006723

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.


Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1966: Application Note 1966 Evaluation Board for the LMH2190 1816
Kbytes		 4-Aug-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]