DAC5675A output impedance

Thomas Chang15933

Expert 4770 points

Other Parts Discussed in Thread: DAC5675A

Dear Team:

What is DAC5675A output (Iou1, Iout2) differential impedance ?

If it is 100 ohm, the ouput connect to transformer (50 ohm impedance) as like EVM suggest item.

Does it will got return loss (impedance is different.)?

over 15 years ago

0 Hamza Fraz over 15 years ago

TI__Expert 5820 points

Thomas

Looking at fig 23 of the datasheet, which shows schematics for 1:1 transformer coupled output to a 50 ohm load, I don't see any impedance mismatch.

Regards,

0 Thomas Chang15933 over 15 years ago in reply to Hamza Fraz

TI__Expert 4770 points

Got it.

So , each single end is 50 ohm, and transformer is also 50 ohm, right?

0 Hamza Fraz over 15 years ago in reply to Thomas Chang15933

TI__Expert 5820 points

Thomas

The differential impedance between IOUT1 and IOUT2 (to the left side of transformer only) is 100//(50+50) = 100//100 = 50, which implies single ended impedance of 25 ohm.

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DAC5675A output impedance