DAC38RF82: Requesting_DAC_spurious_data-Reg

Bala sundaram S

Prodigy 30 points

Part Number: DAC38RF82

Hi!

We have planned to use the DAC38RF82 In our design with below configuration.

Fsample : 8400MHz

Fout : 275-475MHz (Bw:200MHz) in both channels

Interpolation : 6x

NCO : 375MHz

Throughput/lane : 7000MSPS(L=8)

what will be expected SFDR for this output. In datasheet SFDR is only provided above 500MHz. We have also used the same front end circuit with same transformer as in the evaluation board (TCM3-452X-1+) which supports low frequency from 20MHz.

Could you please share us the spurious data for this frequency range.

Also what will be the spur power levels for these frequencies which will help us filter out in the output front end.

Thanks and Regards,
Balasundaram S
Extn No: +91-44-4741-4058

3 天前

0 Lydia 3 天前

TI__Mastermind 42455 points

Hello, we have received your case and the investigation will take some time. Thank you for your patience.

0 Alice 3 天前回复 Lydia

TI__Mastermind 45740 points

Hello,

SFDR for 50MHZ~500MHZ is shared in the ticket below. Do you want get exact 20MHz?

DAC38RF82: Power_level_below_500MHz - RF & microwave forum - RF & microwave - TI E2E support forums

0 Bala sundaram S 2 天前

Prodigy 30 points

Thank you for the data which is helpful but we have another requirement of

Fout 630MHz(NCO)+/-200MHz sweep with SFDR <70dBc inband of 330MHz to 930MHz

Fout 510MHz(NCO)+/-200MHz sweep with SFDR <70dBc inband of 210MHz to 810MHz

in datasheet 60dBc of SFDR is provided but if that <60dBc spurious is out of our mentioned band of interest it can be attenuated with filter. We need this data for our front end planning.

Thanks and Regards,
Bala

0 Bala sundaram S 2 天前回复 Alice

Prodigy 30 points

Thank you for the data which is helpful but we have another requirement of

Fout 630MHz(NCO)+/-200MHz sweep with SFDR <70dBc inband of 330MHz to 930MHz

Fout 510MHz(NCO)+/-200MHz sweep with SFDR <70dBc inband of 210MHz to 810MHz

in datasheet 60dBc of SFDR is provided but if that <60dBc spurious is out of our mentioned band of interest it can be attenuated with filter. We need this data for our front end planning.

Thanks and Regards,
Bala

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DAC38RF82: Requesting_DAC_spurious_data-Reg