1FEATURES

2• (Typical Values are: VSUPPLY = 2.7V and CL = 10

pF, unless Otherwise Specified.)

• Small Signal Bandwidth 78 MHz

• Supply Voltage Range 2.4V to 5V

• Phase Noise (V IN = 1 VPP, fC = 38.4 MHz, Δf = 1

kHz) −123 dBc/Hz

• Slew Rate 106 V/μs

• Total Supply Current 2.3 mA

• Shutdown Current 30 μA

• Rail-to-Rail Input and Output

• Individual Buffer Enable Pins

• Rapid Ton Technology

• Crosstalk Rejection Circuitry

• Packages:

– 8-Pin WSON, Solder Bump and no Pullback

– 8-Bump DSBGA

• Temperature Range −40°C to 85°C

APPLICATIONS

• 3G Mobile Applications

• WLAN–WiMAX Modules

• TD_SCDMA Multi-Mode MP3 and Camera

• GSM Modules

• Oscillator Modules

DESCRIPTION

The LMH2180 is a high speed dual clock buffer

designed for portable communications and

applications requiring multiple accurate multi-clock

systems. The LMH2180 integrates two 75 MHz low

noise buffers with independent shutdown pins into a

small package. The LMH2180 ensures superb

system operation between the baseband and the

oscillator signal path by eliminating crosstalk between

the multiple clock signals.

Unique technology and design provides the LMH2180

with the ability to accurately drive both large

capacitive and resistive loads. Low supply current

combined with shutdown pins for each channel

means the LMH2180 is ideal for battery powered

applications. This part does not use an internal

ground reference, thus providing additional system

flexibility.

The flexible buffers provide system designers the

capacity to manage complex clock signals in the

latest wireless applications. Each buffer delivers 106

V/μs internal slew rate with independent shutdown

and duty cycle precision. Each input is internally

biased to 1V, removing the need for external

resistors. Both channels have rail-to-rail inputs and

outputs, a gain of one, and are AC coupled with the

use of one capacitor.

Replacing a discrete buffer solution with the

LMH2180 provides many benefits: simplified board

layout, minimized parasitic components, simplified

BOM, design durability across multiple applications,

simplification of clock paths, and the ability to reduce

the number of clock signal generators in the system.

The LMH2180 is produced in the tiny packages

minimizing the required PCB space.