lmh2180tmx National Semiconductor Corporation, lmh2180tmx Datasheet

lmh2180tmx

Manufacturer Part Number

lmh2180tmx

Description

Lmh2180 75 Mhz Dual Clock Buffer

Manufacturer

National Semiconductor Corporation

Datasheet

1.LMH2180TMX.pdf (16 pages)

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75 MHz Dual Clock Buffer

General 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 sig-

nals.

Unique technology and design provides the LMH2180 with

the ability to accurately drive both large capacitive and resis-

tive 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 applica-

tions. 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 re-

sistors. 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 pro-

vides many benefits: simplified board layout, minimized par-

asitic 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 min-

imizing the required PCB space.

Typical Application

300246

LMH2180

Features

(Typical values are: V

otherwise specified.)

■

Applications

■

Small signal bandwidth

Supply voltage range

Phase noise (V

Slew rate

Total supply current

Shutdown current

Rail-to-rail input and output

Individual buffer enable pins

Rapid T

Crosstalk rejection circuitry

Packages:

— 8-Pin LLP, Solder Bump and no Pullback

— 8-Bump micro SMD

Temperature range

3G mobile applications

WLAN–WiMAX modules

TD_SCDMA multi-mode MP3 and camera

GSM modules

Oscillator modules

= 38.4 MHz, Δf = 1 kHz)

technology

= 1 V

SUPPLY

= 2.7V and C

30024602

= 10 pF, unless

−40°C to 85°C

www.national.com

July 15, 2010

−123 dBc/Hz

2.4V to 5V

106 V/μs

78 MHz

2.3 mA

30 µA

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