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1FEATURES

2? One Input Clock, Two Output Clocks

? 1.8V Square Wave Clock Outputs

? Inverted Clock Outputs

? Independent Clock Requests

? High Isolation of Supply Noise to Clock Input

? High Output-to-Output Isolation

? Integrated 1.8V Low-Dropout Regulator

– Low Output-Noise Voltage

– 10 mA Load Current

? EMI Filtering

? Ultra Low Standby Current

? VBAT Range = 2.5V to 5.5V

? 8-Bump DSBGA Package

APPLICATIONS

? Mobile Handsets

? Portable Equipment

DESCRIPTION

The LMH2191 is a dual-channel clock tree driver that

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. It also provides

protection of the master clock from varying loads and frequency pulling effects, isolation 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 LMH2191 can be clocked up to 52 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 LMH2191 dual clock

distributor is offered in a tiny 1.61 mm x 1.063 mm 8- bump DSBGA package. Its small size and low supply

current make it ideal for portable applications.