Z, The JTX-2-10TA+ is specified as a 75-Ω transformer, which simply means that the datasheet characterization was done at 75 Ω. The part will still work at 50 Ω, but the performance may be different. We found that this combination of transformers gave us good flatness across the desired output band of the DAC. We try to design the EVM to provide the best performance as possible over the largest bandwidth possible. Depending on your application, this setup may need to be changed to optimize your performance. Regards, Jim
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