LTC6953 datasheet(19/56 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

as any FOLLOWER devices. However, LTC6952 can be

used as a FOLLOWER if necessary by disabling its PLL

(PDPLL = 1).

To simplify both SYNC and/or SYSREF requests down

to a simple software write to the CONTROLLER’s SSRQ

bit, the devices may be connected as shown in Figure 7,

where an additional CONTROLLER output drives each

FOLLOWER’s EZS_SRQ pins (only available for LTC6953

OPERATION

Figure 5. EZSync Standalone

100Ω

OUT0+

OUT1+

EZS_SRQ+

EZS_SRQ–

OUT10+

OUT2+

OUT3+

OUT4+

OUT5+

OUT6+

OUT7+

OUT8+

OUT9+

IN±

CLOCK

GENERATOR

LTC6953

SYNC OR

SYSREF

REQUEST

CMOS

BUFFER

OUT0–

OUT1–

OUT2–

OUT3–

OUT4–

OUT5–

OUT6–

OUT7–

OUT10–

OUT8–

OUT9–

6953 F05

EZSync Multichip

When using EZSync multichip, compatible devices are cas-

caded together, with the clock output of a CONTROLLER

device driving the inputs of one to eleven FOLLOWER

devices as shown in Figure 6. The EZSync protocol

allows for simple synchronization of all devices due to

loose timing constraints on the SYNC signal. When used

in a JESD204B application, SYSREF requests may need

to be retimed to a free running SYSREF output to assure

all FOLLOWERS start and stop their SYSREF signals at

the same time. It is recommended that LTC6953 be used

Figure 6. EZSync Multichip Synchronization (Nine

Followers Shown, Max Eleven Possible

160Ω

100Ω

OUTx±

EZS_SRQ+

IN+

OUT0+

OUT1+

EZS_SRQ+

EZS_SRQ–

OUT10+

OUT2+

OUT3+

OUT4+

OUT5+

OUT6+

OUT7+

OUT8+

OUT9+

LTC6953

11 OUTPUTS

LTC6953

EZSync

CONTROLLER

SYNC OR

SYSREF

REQUEST

CMOS

BUFFER

OUT0–

IN–

OUTx±

11 OUTPUTS

OUT1–

OUTx±

11 OUTPUTS

OUTx±

11 OUTPUTS

OUT2–

OUT3–

OUTx±

11 OUTPUTS

OUTx±

11 OUTPUTS

OUTx±

11 OUTPUTS

OUTx±

11 OUTPUTS

OUT4–

OUT5–

OUT6–

OUT7–

OUTx±

11 OUTPUTS

OUT10–

OUT8–

OUT9–

ALL CONTROLLER TO FOLLOWER

CONNECTIONS MUST BE DC-COUPLED

FOLLOWER-SYNCHRONOUS OUTPUT

CONTROLLER

FOLLOWERS

6953 F06

LTC6953

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

IN+

IN–

EZS_SRQ+

IN±

CLOCK

GENERATOR

LTC6953

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