LTC6952 datasheet(26/80 Pages) AD

26 / 80 page

LTC6952

6952f

For more information www.analog.com

Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

OPERATION

EZSync Multi-Chip

When using EZSync Multi-Chip, compatible devices are

cascaded together, with the clock output of a CONTROLLER

device driving the VCO inputs of one to eleven FOLLOWER

devices as shown in Figure 11. 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 as any FOLLOWER

device. 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 12,

where an additional CONTROLLER output drives each

FOLLOWER’s EZS_SRQ pins (only available for LTC6952

or LTC6953 FOLLOWERs). This request passthrough

configuration reduces the system complexity at the cost

of fewer possible FOLLOWERs (a maximum of 5). Note

that MPx for the CONTROLLER’s passthrough output must

be set greater than 0.

100Ω

REF±

OUT0+

OUT1+

EZS_SRQ+

EZS_SRQ–

OUT10+

OUT2+

OUT3+

OUT4+

OUT5+

OUT6+

OUT7+

OUT8+

OUT9+

LF(s)

VCO±

VCO

REF

LTC6952

SYNC OR

SYSREF

REQUEST

CMOS

BUFFER

OUT0–

OUT1–

OUT2–

OUT3–

OUT4–

OUT5–

OUT6–

OUT7–

OUT10–

OUT8–

OUT9–

6952 F10

160Ω

100Ω

OUTx±

EZS_SRQ+

VCO+

REF±

OUT0+

OUT1+

EZS_SRQ+

EZS_SRQ–

OUT10+

OUT2+

OUT3+

OUT4+

OUT5+

OUT6+

OUT7+

OUT8+

OUT9+

LTC6953 or LTC6952

11 OUTPUTS

LF(s)

VCO±

VCO

REF

LTC6952

EZSync

CONTROLLER

SYNC or

SYSREF

REQUEST

CMOS

BUFFER

OUT0–

VCO–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUT1–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUT2–

OUT3–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUT4–

OUT5–

OUT6–

OUT7–

OUTx±

EZS_SRQ+

VCO+

LTC6953 or LTC6952

11 OUTPUTS

VCO–

OUT10–

OUT8–

OUT9–

ALL CONTROLLER TO FOLLOWER CONNECTIONS MUST BE DC COUPLED

FOLLOWER-SYNCHRONOUS

OUTPUT

FOLLOWER-SYNCHRONOUS

OUTPUT

CONTROLLER

FOLLOWERS

6952 F11

Figure 10. EZSync Standalone

Figure 11. EZSync Multi-Chip Synchronization

(Nine Followers Shown) Max Eleven Possible

LTC6952 Datasheet(PDF) 26 Page - Analog Devices

LTC6952 Datasheet(HTML) 26 Page - Analog Devices

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