Dual channel 52 MHz Clock Tree Driver


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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 1.615 mm x 1.070 mm 8-bump micro SMD package. Its small size and low supply current make it ideal for portable applications.

  • 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
  • micro SMD 8-Bump Package


Clock buffers
LMH2191 Dual-channel 52-MHz clock tree driver
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Evaluation board

LMH2191TMEVAL/NOPB — Dual channel 52 MHz Clock Tree Driver

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Technical documentation

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Type Title Date
* EVM User's guide AN-2028 Evaluation Board for the LMH2191 (Rev. A) 01 May 2013
Certificate LMH2191TMEVAL/NOPB EU Declaration of Conformity (DoC) 02 Jan 2019

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