LTC6953 datasheet(18/56 Pages) AD

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LTC6953

Rev 0

For more information www.analog.com

Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

OPERATION

Table 8. Parameters and Limitations of EZSync and ParallelSync (Two Stages Only)

EZSync

STANDALONE

(SEE

FIGURE 5)

EZSync MULTICHIP

ParallelSync MULTICHIP

PIN CONTROLLED

REQUESTS

(SEE FIGURE 6)

REQUEST PASS-THROUGH

(SEE FIGURE 7)

GENERAL

REFERENCE

DISTRIBUTION

(SEE FIGURE 8)

LTC6953

REFERENCE

DISTRIBUTION

SEE FIGURE 9)

CONTROLLER FOLLOWER

CONTROLLER

FOLLOWER

RMS Jittera

~75fs

~105fs

~75fs

~105fs

~75fs

Possible Number of Followers

(Nfol)

–

1 to 11

1 to 5

–

Possible Number of Parallel Parts

(Npar)

–

Unlimitedb

1 to 5

Total Number of Outputs

11 Nfol

11 – 2 Nfol

11 Nfol

11 Npar

Maximum Number of Outputs

121

Unlimitedb

Maximum Skew

tSKEW

~ tSKEW + tPDc

~tSKEWd

SYNC Timing

Easy

Moderate

Easy

SYSREF Request Timing

Easy

Moderate

Easy

Moderate

Easy

Number of External VCOs

Npar

Software SYNC/SYSREF Request?

Yes

a Assumes ADC SNR equivalent integrated PLL/VCO RMS jitter contribution of 27fs and additive jitter for distribution-only parts of 70fs.

b The only limitation is the ability to distribute the reference accurately.

c Assumes worst-case skew between CONTROLLER and FOLLOWER outputs. Dependent on propagation delay of FOLLOWER and skew of controller-to-

follower routing.

d Dependent on skew of reference distribution parts, reference routing and individual part-to-part skew.

Table 7. Settings of EZMD and PARSYNC for Different Synchronization Topologies

CONTROL BIT

EZSync STANDALONE

(SEE FIGURE 5)

EZSync MULTICHIP (SEE FIGURES 6 AND 7)

ParallelSync MULTICHIP

(SEE FIGURES 8 AND 9)

CONTROLLER

FOLLOWER

PARSYNC (LTC6952 Only)

EZMD

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