DAC37J82: 1 to 4 fanout

Joe Miller1

Part Number: DAC37J82
Other Parts Discussed in Thread: DAC37J84

Dear Sir/Madam,

I am looking for a suitable solution to be able to connect the DAC37J82 to four identical loads.
Below is a discrete solution.

Regards Joe

over 4 years ago

0 jim s over 4 years ago

TI__Guru* 91947 points

Joe,

Why not use the DAC37J84 and send all four outputs to four amplifiers? You can use the same input data for all 4 DAC's.

Regards,

Jim

0 Joe Miller1 over 4 years ago in reply to jim s

Intellectual 325 points

Dear Jim,

Thank you for the reply.

Sorry, I did not paint the entire picture. I need 1:8 and cannot used two quad DACs so the plan is to use one dual channel DAC and two 1:4 fanout circuits per channel. The question relates to the best way to achieve 1:4 when connect to one channel of the DAC. One manufacturer offers a 1:4 video distribution amplifier. I am wondering if TI has something similar for 200MHz bandwidth or recommends discrete single and quad op amp solution.

Regards Joe

0 jim s over 4 years ago in reply to Joe Miller1

TI__Guru* 91947 points

8132.Arb Waveform TI design.pdf termination app note.pdfJoe,

I would suggest contacting the high speed amplifier group. They should be able to suggest parts and provide a solution I would think. I have also attached a couple of documents that explain how to properly terminate a DAC when using an amplifier.

Regards,

Jim

0 Joe Miller1 over 4 years ago in reply to jim s

Intellectual 325 points

Dear Jim,

Thank you.

Regards

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DAC37J82: 1 to 4 fanout