AD9231, AD9573

Hi TKa303,

My reading of the AD9573 datasheet indicates that the 100M output is fixed at 100MHz (not adjustable), which is too high for AD9231.

The AD9231 datasheet shows the AD9510/AD9511/AD9512/AD9513/AD9514/AD9515/AD9516/AD9517 family as possible clock generators. Do any of these work for you?

Thanks,

Doug

Unknown said:

My reading of the AD9573 datasheet indicates that the 100M output is fixed at 100MHz (not adjustable), which is too high for AD9231.

On page 7 the datasheet indicates that the max. Input Clock Rate for the AD9231 is 625MHz. Why should the 100MHz be to high? The AD9231 also contains an input clock divider with the ability to divide the input clock by integer values between 1 and 8.

Unknown said:

The AD9231 datasheet shows the AD9510/AD9511/AD9512/AD9513/AD9514/AD9515/AD9516/AD9517 family as possible clock generators. Do any of these work for you?

The AD9510/AD9511/AD9512/AD9513/AD9514/AD9515/AD9516/AD9517 are all clock distribution ICs. If I'll use one of them I would still need an clock generator IC, right?

Hi TKa303,

I apologize . . . you are absolutely right about the clock divider. I'm sorry about my missing that. I had a sample rate of 100Msps stuck in my head.

Regarding clock generation and distribution, again you are correct. I'll ask an AD9573 knowledgeable engineer to reply to your questions.

Again, I'm sorry for my hasty replies.

Doug

Hi TKa303,

As you already knew, the AD9573 can provide a 100MHz LVDS clock to the AD9231. As you also already know, you'll need to divide the clock frequency to bring it within the AD9231 clock frequency range.

I checked with the AD9573 engineer. You need to supply power to all the voltage supply pins (VDDA=VDDX=VDDA=VDD=VDD33=3.3V+/-10%) even if the 33MHz output is not used. Connect GND33 to ground. I believe you can leave 33M floating, but I will confirm.

Thanks,

Doug

Hi,

As expected, it is OK to float 33M if it is not used.

Thank you.

Doug

Thank you Doug!

You are very welcome. I wish the best for you and your project.