LMH2180 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – 75 MHz Dual Clock Buffer

LMH2180
www.ti.com
SNAS419D – JANUARY 2008 – REVISED MARCH 2013
LMH2180 75 MHz Dual Clock Buffer
Check for Samples: LMH2180
FEATURES
1
•2 (Typical Values are: V_SUPPLY = 2.7V and C_L = 10
pF, unless Otherwise Specified.)
• Small Signal Bandwidth 78 MHz
• Supply Voltage Range 2.4V to 5V
• Phase Noise (V_IN = 1 V_PP, f_C = 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 T_on 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.
TYPICAL APPLICATION
Enable 1
VCTCXO
10 nF
VCC
EN1 8
1
IN1 2
1
7 OUT1
LMH2180
Rload
LOAD1
Cload
Enable 2
IN2 3
2
EN2 4
5
6 OUT2
GND
Rload
LOAD2
Cload
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated