How can the LT5537 log detector circuit parameters be configured for optimal performance at 70MHz ± 1MHz, and what adjustments are needed for 200MHz operation?

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The LT5537 can be used at 70MHz as it falls within its typical detection range. To achieve the best performance, a minimum Vcc of 2.8V is required for a 90dB dynamic range. If the 90dB dynamic range is not achieved, increasing Vcc slightly or reducing the output-to-ground resistor value can help. The datasheet (DS) provides a section on optimizing dynamic range, which would be more helpful for detailed configuration. For 200MHz operation, the datasheet includes performance plots showing optimal performance at this frequency. While performance may vary under different operating conditions, the same optimizing techniques should still be applicable at 200MHz.

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LT5537: FAQ