DIT4192: output transformer

Dimitri Petrucci1

Part Number: DIT4192
Other Parts Discussed in Thread: SRC4392

hello,

I can't find the transformer suggested by the DIT4192 datasheet for the transmitter coaxial output, can DA101C be used for this purpose?

https://www.mouser.it/datasheet/2/281/kmp_da100-185018.pdf

over 5 years ago

0 Collin Wells over 5 years ago

TI__Guru 62935 points

Hello,

We reviewed the datasheet for that product and it looks like it should work. It's meant for this specific purpose and meets some of the AEC standards. The jitter performance isn't specified like it is for the Scientific Conversion products, but that's what the AEC standards dictate so it should work. We use SC939-06 on the DIX4192EVM which is still in production.

0 Andy Peters over 5 years ago

Genius 3945 points

I use the DA101C in a design based on the SRC4392, which uses the same transmitter as the DIT4192. It works well.

0 Collin Wells over 5 years ago in reply to Andy Peters

TI__Guru 62935 points

Thank you for sharing Andy!

0 Dimitri Petrucci1 over 5 years ago in reply to Collin Wells

Prodigy 70 points

thank you,

should I use the circuit shown in DIT4192 datasheet Figure 12 or Figure 13?

I need unbalanced 75Ω Coaxial Cable Transmission, as recommended by Figure 13, but it uses a 2:1 transformer, while DA101C is 1:1

as alternative, I could use the schematic suggested in SRC4392 datasheet Figure 89, but where should TX- be connected then?

0 Collin Wells over 5 years ago in reply to Dimitri Petrucci1

TI__Guru 62935 points

Hi Dmitri,

Good catch - we'd missed the difference in transformer windings between the two units. One option would be to find a 2:1 transformer in the same family from Murata. Otherwise you can apply a resistor divider circuit similar to what you found in the SRC datasheet but make it differential instead of single-ended. A circuit like the one shown below would work

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DIT4192: output transformer