Peripheral

Peripheral

Clock

Source

CBAT

COUT

VDD

CCLK

VBAT

1 µF

10 nF

2.2 µF

CLK2

CLK1

VBAT

SCLK_IN

LMH2191

CLK_REQ1

CLK_REQ2

VOUT

VSS

Clock

Tree

Driver

1.8V LDO

Clock

Request

A1

D2

A2

B2

C2

B1

C1

D1

CSERIES

LMH2191

www.ti.com

SNAS485D – JULY 2010 – REVISED MAY 2013

LMH2191 Dual Channel 52 MHz Clock Tree Driver

Check for Samples: LMH2191

1

FEATURES

DESCRIPTION

The LMH2191 is a dual-channel clock tree driver that

2

•

One Input Clock, Two Output Clocks

supplies a digital system clock to peripherals in

•

1.8V Square Wave Clock Outputs

mobile handsets or other applications. It provides a

•

Inverted Clock Outputs

solution to clocking issues such as limited drive

capability for fanout or longer traces. It also provides

•

Independent Clock Requests

protection of the master clock from varying loads and

•

High Isolation of Supply Noise to Clock Input

frequency

pulling

effects,

isolation

from

noisy

•

High Output-to-Output Isolation

modules, and crosstalk isolation. It has very low

phase noise which enables it to drive sensitive

•

Integrated 1.8V Low-Dropout Regulator

modules such as Wireless LAN and Bluetooth.

–

Low Output-Noise Voltage

The LMH2191 can be clocked up to 52 MHz and has

–

10 mA Load Current

an independent clock request pin for each clock

•

EMI Filtering

output which allows the peripheral to control the

•

Ultra Low Standby Current

clock. It features an integrated LDO which provides

an ultra low-noise voltage supply with 10 mA external

•

VBAT Range = 2.5V to 5.5V

load current which can be used to supply the TCXO

•

8-Bump DSBGA Package

or other clock source. The LMH2191 dual clock

distributor is offered in a tiny 1.61 mm x 1.063 mm 8-

APPLICATIONS

bump DSBGA package. Its small size and low supply

current make it ideal for portable applications.

•

Mobile Handsets

•

Portable Equipment

Typical Application

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2010–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.