LTC6955 datasheet(13/22 Pages) AD

13 / 22 page

LTC6955

Rev 0

For more information www.analog.com

Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

Introduction

The LTC6955 can be used in any application where mul-

tiple outputs of the same clock frequency are needed. It

is especially effective for data converter clocking, where

ultralow jitter is often necessary to prevent negative

impact on the data converter’s noise performance.

APPLICATIONS INFORMATION

Input

The LTC6955’s input buffer, shown in Figure 1, has a fre-

quency range of DC to 7.5GHz. The buffer has a partial

on-chip differential input termination of 250Ω, allow-

ing some flexibility for an external matching network if

desired. Figure 3 shows recommended interfaces for dif-

ferent input signal types.

Figure 3. Common Input Interface Configurations. All ZO Signal Traces Are 50Ω Transmission Lines

1nH

160Ω

0.1µF

1pF

–

0.1µF

75Ω

30Ω

160Ω

150Ω

CML

LVDS

CML

LVDS

LTC6955

LVPECL

6955 F03

IN+

IN–

LTC6955

RF OSCILLATOR

50Ω OUTPUT

AC-Coupled RF Sine Wave Oscillator (fIN < 5GHz)

AC-Coupled Differential CML or LVDS (fIN < 5GHz)

DC-Coupled Differential LVPECL*

AC-Coupled Differential CML or LVDS (fIN ≥ 5GHz)

DC-Coupled Differential CML*

AC-Coupled Differential LVPECL

CML

LVPECL

* DC coupled CML and LVPECL input common mode level must be within the

min and max levels speciﬁed in the Electrical Characteristics. All LTC6951,

LTC6952, LTC6953, and LTC6955 CML output levels are acceptable.

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

1pF

1nH

IN+

IN–

LTC6955

RF OSCILLATOR

50Ω OUTPUT

AC-Coupled RF Sine Wave Oscillator (fIN ≥ 5GHz)

1pF

–

1pF

0.1µF

50Ω

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