AD9689-2000EBZ datasheet(54/134 Pages) AD

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AD9689

Data Sheet

Rev. A | Page 54 of 134

The synchronization triggering mechanism uses a master/slave

arrangement, as shown in Figure 116.

CLOCK

GENERATION

SYSREF±

DEVICE_CLOCK±

MNTO

SNTI

1 LINK,

L LANES

1 LINK,

L LANES

1 LINK,

L LANES

1 LINK,

L LANES

ADC DEVICE 0

(MASTER)

ADC DEVICE 1

(SLAVE)

ADC DEVICE 2

(SLAVE)

ADC DEVICE 3

(SLAVE)

MNTO = MASTER NEXT TRIGGER OUTPUT (CMOS)

SNTI = SLAVE NEXT TRIGGER INPUT (CMOS)

Figure 116. System Using Master/Slave Synchronization Triggering

Each device has an internal next synchronization trigger enable

(NSTE) signal that controls whether the next SYSREF signal

causes a synchronization event. Slave ADC devices must source

their NSTE from an external slave next trigger input (SNTI) pin.

Master devices can either use an external master next trigger

output (MNTO) pin (default setting), or use an external SNTI pin.

See Table 47 (Register 0x0041 and Register 0x0042) to configure

the FD_x/GPIO pins for this operation.

NCO Multichip Synchronization at Startup

Figure 117 shows a timing diagram along with the required

sequence of events for NCO multichip synchronization using

triggering and SYSREF at startup. Using this start-up sequence

synchronizes all the NCOs and LMFCs in the system at once.

NCO Multichip Synchronization During Normal Operation

See the Setting Up the Multichannel NCO Feature section.

MNTO

SNTI

SYSREF

DEVICE

CLOCK

LMFCs

DON’T CARE

NCOs

NCO

SYNCHRONIZED

LMFC

SYNCHRONIZED

BOARD PROPAGATION

DELAY

NSTE

INPUT DELAY

CONFIGURE MASTER

AND SLAVE DEVICES

ENABLE TRIGGER IN

MASTER DEVICES

MNTO SET HIGH

SNTI SET HIGH

SYSTEM

SYNCHRONIZATION

ACHIEVED

SYSREF

IGNORED

MNTO = MASTER NEXT TRIGGER OUTPUT (CMOS)

SNTI = SLAVE NEXT TRIGGER INPUT (CMOS)

NSTE = NEXT SYNCHRONIZATION TRIGGER ENABLE

LMFC = LOCAL MULTIFRAME CLOCK

NCO = NUMERICALLY CONTROLLED OSCILLATOR

Figure 117. NCO Multichip Synchronization at Startup (Using Triggering and SYSREF)

AD9689-2000EBZ Datasheet(PDF) 54 Page - Analog Devices

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