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Comparator

ttd
Mastermind 8830 points
Other Parts Discussed in Thread: TLV3601, TLV3602, LM311

Dear Technical Support Team,

I'd like to replace from MAX9972 to discrete TI device.

It has comparator and spec is datasheet page 4.

https://datasheets.maximintegrated.com/en/ds/MAX9972.pdf


Which part number of comparator is better? 

For example, pick up spec of MAX9972 's comparator

Propagation Delay is 2.2ns(typ)

Input Voltage Range -2.2 +5.2 V

Differential Input Voltage -7.4 +7.4 V

Best Regards,

ttd

  • +1
    TI__Mastermind 26580 points

    Ishii-san

    Thanks for your post. We don’t have a comparator with exactly the same operating levels but I believe our TLV3601/3 (single) and TLV3602 (dual channel) meets most application requirements. 
    Chuck

  • 0 in reply to Chuck Sins
    Mastermind 8830 points

    Hi Chuck,

    Thank you for your reply.

    TLV3602(dual channel) is better for building the window comparator.

    By the way do you have any comparator to input/supply minus voltage?

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Mastermind 26580 points

    Thanks for following up.  I just need to make sure I am understanding the requirement.  All comparators can essentially be power with split supplies.  For example, a device with 5.5V rating can be powered with +/-2.75 or -1/4.5 or 0/5.5.  The key is that the difference between the supplies doesn't extend beyond the 5.5V voltage rating.  The downside is that the output logic low is defined by the voltage applied to the VEE pin (low supply voltage).  If that is not acceptable as a use case, the best option we have that would allow what we refer as bipolar inputs (signals above and below ground) and still can provide a ground referenced output for compatibility with downstream devices is the LM311/211/111 family.  There is a dual version as well called LM319.  However, these devices do not have the speed capability of the devices we were previously discussing.

    Chuck

  • 0 in reply to Chuck Sins
    Mastermind 8830 points

    Hi Chuck,

    Thank you for your comment.

    I got your advice for dual supply and downside.

    LM319 has only response time(80ns) and it doesn't have spec for bandwidth and propagation delay.

    Is it the reason why output is open-collector(not push-pull)? 

    Best Regards,

    ttd 

  • +1 in reply to ttd
    TI__Mastermind 26580 points

    Sorry we don't have anything else to offer at this point.  The LM319 was probably designed with OC for the flexibility but it does create asymmetrical output rise and fall times as a result.  A new development will have both PP and OC options.

    Chuck

  • 0 in reply to Chuck Sins
    Mastermind 8830 points

    Hi Chuck,

    If it's possible,could you share new comparator during developing through direct mail?

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Genius 11701 points

    ttd,

    Sounds good. I sent you a friend request so we can discuss offline regarding the new device.

    -Chi