DAC5689 Real IF inteface - Independant & Differenct frequency plane

Jin Kyung Han

Expert 1520 points

Hello

I would like to know is the below configuration possible or Not.

The DAC has 2 path, I want to put different frequency respectively channel1 and channel2.

It means that the ouput frequency of DAC1 is 25MHZ and the other one's frequency is 75MHZ.

I atatche detail block diagram as below, please review it and give me answer.

========================= Below ===============================

0361.DAC5689 Real IF interface.doc

Thanks and Best Regards

over 10 years ago

0 Kang Hsia over 10 years ago

TI__Guru 67904 points

Hi,

The input bandwidth of the DAC is limited by the FIR1 (2x interpolator) low pass filter limit. To generate 75MHz, you will need data rate higher than 100MSPS. I suggest that you use 200MSPS input rate and 4x interpolation to allow enough input bandwidth for the 75MHz.

See section 4 of the following app note for detail:

http://www.ti.com/lit/an/slaa523a/slaa523a.pdf

-Kang

0 Jin Kyung Han over 10 years ago in reply to Kang Hsia

Expert 1520 points

Hello

Thank you for your anwer.

It is a helpful guide for me.

Regards

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DAC5689 Real IF inteface - Independant & Differenct frequency plane