LTC6955 datasheet(22/22 Pages) AD

22 / 22 page

LTC6955

Rev 0

For more information www.analog.com

Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

 ANALOG DEVICES, INC. 2018

D16970-0-5/18(PrA)

www.analog.com

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER

DESCRIPTION

COMMENTS

LTC6952

Ultralow Jitter, 4.5GHz PPL with 11 Outputs and

JESD204B Support

PLL with Eleven Independent CML Outputs with Dividers and Delays,

65fs Additive ADC SNR Jitter

LTC6953

Ultralow Jitter, 4.5GHz Clock Distributor with 11

Outputs and JESD204B Support

Eleven Independent CML Outputs with Dividers and Delays,

65fs Additive ADC SNR Jitter

LTC6945/

LTC6946

Ultralow Noise and Spurious Integer-N Synthesizers

370MHz to 6.39GHz, –226dBc/Hz Normalized In-Band Phase Noise Floor,

–157dBc/Hz Wideband Output Phase Noise Floor

LTC6947/

LTC6948

Ultralow Noise and Spurious Frac-N Synthesizers

350MHz to 6.39GHz, –226dBc/Hz Normalized In-Band Phase Noise Floor,

–157dBc/Hz Wideband Output Phase Noise Floor

LTC6950

1.4GHz Low Phase Noise, Low Jitter PLL with Clock

Distribution

Four Independent LVPECL Outputs with 18fsRMS Additive Jitter

(12kHz to 20MHz)

LTC6951

Ultralow Jitter Multioutput Clock Synthesizer with

Integrated VCO

Four Independent CML Outputs and One LVDS Output, Integrated VCO,

110fs ADC SNR Jitter

LTC6954

Low Phase Noise, Triple Output Clock Distribution

Divider/Driver

LVPECL, LVDS and CMOS Outputs with < 20fsRMS Additive Jitter

(12kHz to 20MHz)

Generation of 4GHz, 52fs ADC SNR Jitter Clocks Using LTC6952 and LTC6955

49.9Ω

1µF

75Ω

30Ω

0.1µF

100Ω

0.1µF

10kΩ

160Ω

100Ω

1µF

48.7Ω

0.1µF

33nF

48.7Ω

1.2µF

0.47µF

100Ω

0.1µF

22nF

VCO+

VCO–

REF+

REF–

VOUT

VREF

VCP

3.3V

VVCO

3.3V

OUT10±

LTC6952

OUT6±

OUT7±

OUT8±

OUT9±

Crystek

CVCO55CC-

4000-4000

IN+

IN–

VOUT

3.3V

VTUNE

VIN

OUT0±

4GHz CLOCKS

OUT1±

OUT2±

OUT10+

OUT10–

LTC6955

BUFFER

OUT3±

OUT4±

OUT5±

OUT6+

OUT6–

OUT7±

OUT8+

OUT8–

OUT9±

3.3V

FILT

fVCO

POWERED DOWN OR

ADDITIONAL 4GHZ CLOCKS

SYSREF PAIRS TO

LTC6955 CLOCKS

OUT0+

OUT0–

OUT1±

OUT2+

OUT2–

CAN BE USED AS

CLOCKS ≤ 4GHZ

OR SYSREFS

fOUT = 4GHz

SEL3

SEL2

SEL1

SEL0

3.3V

Crystek

CCHD-575-25-100

100MHz Ref Osc

LTC6952Wizard REGISTER VALUES:

FILE: LTC6952_LTC6955_4GHz

EZS_SRQ+

EZS_SRQ–

TO SYNC OUTPUTS:

TOGGLE SSYNC REGISTER BIT

6955 TA03a

OUT3±

OUT4±

OUT5±

LTC6955 RMS JITTER = 52fs

LTC6952 RMS JITTER = 78fs

EQUIVALENT ADC SNR METHOD

LTC6952 (6 OUTPUTS ON)

LTC6955 (ALL OUTPUT ON)

OFFSET FREQUENCY (Hz)

10k

100k

10M 40M

–170

–160

–150

–140

–130

–120

–110

–100

6955 TA03b

LTC6955 vs LTC6952 4GHz Phase Noise

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