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.