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SN65HVD63: What will happen if we use AISG2.0 device in AISG3.0 requirement system?

Gabriel Xu
Intellectual 2085 points
Part Number: SN65HVD63
Other Parts Discussed in Thread: SN65HVD62

Tool/software:

Here is some questions from customer side:

 

  • I want to double confirm the meaning of “maximum level” spec in below table. Is it mean that the maximum remaining interface signal after bandpass filter attenuation? Take SN65HVD63 as a example. It means that any interface signal in out of band [1.35Mhz~3.5Mhz] the maximum signal in receiver after bandpass filter will less than 142mVpp?
  • Customer want to confirm why for AISG3.0 support, the maximum level spec is 13dBm and frequency range is 1.35Mhz~3.5Mhz. This spec is follow by AISG3.0 standard am I right?
  • The second diagram is the spec I found in AISG3.0 standard document, are SN65HVD63 -13dBm maximum level is follow by this requirement?
  • Any other difference between HVD62 and HVD63 besides bandpass filter performance?
  • Customer new system need to support AISG3.0 standard. What will happen if they use SN65HVD62 in their system?

 

  • 0
    TI__Mastermind 46807 points

    Hi Gabriel,

    1. Maximum level - is the maximum signal level received from a spurious frequency component in the frequency range listed. So If there is a spurious frequency <= 3.5MHz the maximum signal level is -13dBm for the SN65HVD63. The spurious frequency component is specifically not the modulation frequency used in ASIG. 

    2. Yes this is a value from the standard itself. 

    3. The SN65HVD63 is designed to meet ASIG3.0 standard. So it meets standard. 

    4. SN65HVD62 is ASIG2.0 - if they need ASIG3.0 they shouldn't even look at that part. Forget that part - the only option we have is the SN65HVD63 that meets ASIG3.0. 

    5. Don't use it - it won't be compliant with ASIG3.0. That's all - if they try to use it against our advice they take full responsibility and liability when the system fails and our support if they come to us is "they shouldn't use this part". Don't even entertain this line of thinking - they can use HVD63 or nothing we don't really support ASIG beyond those two devices and our support is limited for these devices in general. 

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Intellectual 2085 points

    I have further questions about the maximum level. How we test or mesuare our device real performance this this spec?

    We didn't give the spurious frequency componets signal level, it menas that no matter how large the signal level (larger than 3.5Mhz signal) before the filter, our bandpass filter could make sure the output is less than -13dBm?

  • 0 in reply to Gabriel Xu
    TI__Mastermind 46807 points

    Gabriel,

    The information is in the chart you already posted:

    If gives you the spurious frequency range - we also show the spectrums in various conditions:

    This is the information we have on this device bandpass filter:

    Spurious frequency doesn't have an exact number - but a range because the spurious signals are just not the fundamental modulation frequency  - so it includes. It includes the 4.17MHz number because this device is backwards compatible with ASIG2.0 (but you can't use ASIG2.0 with ASIG3.0 system requirements).

    Best,

    Parker Dodson