DAC5674: Interpolation filter performance

Jim Morse

Part Number: DAC5674

We would like to use the DAC5674 as a replacement for an Analog Devices AD9772A 14 bit DAC with 2x interpolation filter and zero stuffing, but that part is going obsolete. We are clocking parallel data in at 73.728MHz and generating an ~ 140MHz IF output signal with a 4MHz bandwidth. We had evaluated the DAC5674 previously, but someone at TI told us it might generated a harmonic signal at 180MHz that would be hard to filter out. Is this really true, or would the DAC5674 be a good choice for this application?

Thanks,

Jim

over 5 years ago

0 Jim Brinkhurst1 over 5 years ago

TI__Mastermind 43830 points

Hi Jim
Sorry for the delay.
One of our DAC experts will respond to your question soon.
Best regards,
Jim B

0 Neeraj Gill over 5 years ago

TI__Mastermind 20541 points

Hi Jim,

Can you please give me more info about your use case.
Such as sample rate of the DAC, DATA RATE, output signal frequency output signal bandwidth.

DAC5674 is capable of max 200MSPS DATARATE which means you should be able to generate IF output signals upto ~100MHz.

Regards,
Neeraj

0 Jim Morse over 5 years ago in reply to Neeraj Gill

Prodigy 30 points

Hi Neeraj,

The symbol rate and bandwidth is 4.096 MHz. There are 18 samples per symbol to get up to the 73.728 MHz sample rate we are running into the DAC. We were previously using the Analog Devices AD9772A with 2x clock multiplying and 2x interpolation filtering with zero stuffing to generate a 140 MHz IF output that we feed into our RF section to modulate up to 2.4GHz for transmission, 4 MHz bandwidth.

The AD9772A is going obsolete so I would like to design in the DAC5674 in its place. Do you see any problems with this device in this application, or have any better suggestions?

Thanks,

Jim

0 Neeraj Gill over 5 years ago in reply to Jim Morse

TI__Mastermind 20541 points

Hi Jim,

I think DAC5674 will work for you application. I don't see any issue.

Regards,
Neeraj

0 Jim Morse over 5 years ago in reply to Neeraj Gill

Prodigy 30 points

Thanks Neeraj!

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DAC5674: Interpolation filter performance