fnx7
Junior Member level 2
In AD9779 datasheet,
The default settings for the evaluation board allow the user to view the differential outputs through a transformer that converts the DAC output signal to a single-ended signal. On the evaluation board, these transformers are designated T1A, T2A, T3A, and T4A. There are also four common-mode transformers on the board that are designated T1B, T2B, T3B, and T4B. The recommended operating setup places the transformer and common-mode transformer in series. A pair of transformers
and common-mode transformers are installed on each DAC output, so that the pairs can be set up in either order. As an example, for the frequency range of dc to 30 MHz, it is recommended that the transformer be placed right after the DAC. Above DAC output frequencies of 30 MHz, it is recommended that the common-mode transformer is placed right after the DAC outputs, followed by the transformer.
I know the function of the common-mode transformer, what is the function of the other transformer?
Why there is a sequence of the two transformer at different frequency outputs?
Thanks!
The default settings for the evaluation board allow the user to view the differential outputs through a transformer that converts the DAC output signal to a single-ended signal. On the evaluation board, these transformers are designated T1A, T2A, T3A, and T4A. There are also four common-mode transformers on the board that are designated T1B, T2B, T3B, and T4B. The recommended operating setup places the transformer and common-mode transformer in series. A pair of transformers
and common-mode transformers are installed on each DAC output, so that the pairs can be set up in either order. As an example, for the frequency range of dc to 30 MHz, it is recommended that the transformer be placed right after the DAC. Above DAC output frequencies of 30 MHz, it is recommended that the common-mode transformer is placed right after the DAC outputs, followed by the transformer.
I know the function of the common-mode transformer, what is the function of the other transformer?
Why there is a sequence of the two transformer at different frequency outputs?
Thanks!
