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ADS54J60: Unused channel treatment

Kelvin Tee
Genius 10035 points
Part Number: ADS54J60

Hi 

I have following questions

1. If we use a single channel only with PDN MASK, can we set Open or NC (No Connect) for no use channel output pins? For instance, if we use Ch A only, can we set LMFS 8224, BBxM and DBxP Open?

2. What is the difference between LANE PDN 0 and LANE PDN 1 on the attached datasheet page# 70, Table 66 Register 17h Filed Descriptions? Looks like both are same description. Please help to advise.

Best Regards
Kelvin

  • 0
    TI__Guru* 91947 points

    Kelvin,

    You can leave powered down outputs open. For #2 this is a typo. We will get back to you regarding the correct description.

    Regards,

    Jim

  • 0 in reply to jim s
    TI__Guru* 91947 points

    Kelvin,

    To use this register to power down serdes lanes, you must write a "1" to both bits 3 and 5 (PDN1 and PDN0). These bits can be either "00" or "11". All other combinations are not valid and should not be used. Note that this power down mode only works for LMFS = 4244, 2242, 4211 and 2221. This function will not work for CHA only when using 8224 mode as it will turn off serdes lanes DA0 and DA3 which are needed.

    Regards,

    Jim 

  • 0 in reply to jim s
    TI__Genius 10035 points

    Hi Jim

    The answer #1 is clear. Thanks
    Have you got the correct description for #2?

    Rgds
    Kelvin

  • +1 in reply to Kelvin Tee
    TI__Guru* 91947 points

    Kelvin,

    The data sheet did not have a typo. It was just a little confusing to me when I first read it. The description is exactly as worded in my last post and I even tested it on a TI EVM. This feature cannot be used with a LMFS = 8224.

    Regards,

    Jim