Part Number: LMH1239
Hi team,
Our customer is currently evaluating the LMH1239, and we would appreciate it if you could review the following inquiry.
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We understand that, unlike previous SDI equalizers, the LMH1239 requires monitoring the CDR_Locked register, and if the device is not locked, it is necessary to perform an ENABLE pin override.
However, when switching frequently between HD-SDI and 3G-SDI formats, there are cases where, even though the CDR_Locked register indicates a locked state, the video output is not displayed correctly at SDI_OUT± (thru output) and OUT0±.
We attempted to fully dump the register data for both the working (OK) and non-working (NG) cases using a 1080/60i input, but we could not clearly identify the differences.
The only differences appear in the registers highlighted in yellow; however, these registers are not described in the programming guide.
The only differences appear in the registers highlighted in yellow; however, these registers are not described in the programming guide.
At this time, all registers are configured with their default settings, except for input switching and disabling OUT1±.
Could you please advise whether there may be any incorrect usage, missing configuration, or additional considerations when operating the LMH1239 under these conditions?
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Best regards,
Kyohei
