Output SMA Connector J3

Question

Hello. 
 Evaluation board AD9736-DPG2-EBZ has SMA connector J3. It's connected via solder jumper to transformer T1. Please tell what is purpose of this connector if spectrum analyzer connects to other SMA Connector J2? Thanks.

PMH2023 · Accepted Answer

Hello,

The highlighted JP1 connection provides a ground connection for T1 so output observed at J2 is single-ended.
If jumper JP1 position is switched (1-2) than the DAC output signal is provided as differential output with both J2 and J3 connectors.

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Output SMA Connector J3

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