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

SNAS485D – JULY 2010 – REVISED MAY 2013

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APPLICATION INFORMATION

The LMH2191 is a complete 52 MHz clocking conditioner and clock tree driver. The LMH2191 is used to supply

a common clock to mobile phone peripherals such as Bluetooth, Wireless LAN, and/or Digital Video Broadcast-H

(DVB-H). The high isolation between the clock outputs ensures that the peripherals don't disrupt each other. Its

excellent phase noise characteristics prevent the clock quality from deteriorating. A typical LMH2191 setup is

depicted in Figure 17.

Figure 17. LMH2191 Typical Application Schematic

The internal structure of the LMH2191 is depicted in the block diagram of Figure 18.

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