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SYSREF signal in ADRV9009

Category: Hardware
Product Number: ADRV9009

Hi,

in my application I use 4 chips ADRV9009 that works undependably- not synchronized.

My question is about the signal SYSREF.

According with data sheet this signal used for multi chip synchronization.

I transmit and receive the I and Q in each chip independently. Can I leave this signal disconnected? Or connected to GND?

According with EVB ADRV9009 you connected this signal to PLL AD9528 why?

Thanks

Haim

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