Please teach me AD9524 LVPECL termination.
Data sheet recommends Fig17.
But there is no return path in fig17.
Is return path necessary?
We are considering the configuration, such as attachments.Is there a issue?
The AD9524 drivers are not truely LVPECL drivers. They do not use bipolar devices. Instead they have LVPECL compatible voltage levels, so they work with LVPECL input receivers. Due to this difference, the termination scheme of these drivers is different. Please terminate them with 100 ohm deferentially, at the input receiver, as shown in figure 17 of the datasheet.
The following is an attached file.
Your attachment diagram show DC biasing of the LVPECL open emitter outputs but AD9525 has bipolar driver and needs no biasing... And if your transmission lines are not electrically short you would need to terminate the lines at the receiver ends juts like shown on Fig.17...
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