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LMH7324: LMH7324

Ishwar Sharma
Prodigy 160 points
Part Number: LMH7324
Other Parts Discussed in Thread: TLV3601

Tool/software:

Hi

We are looking this quad comparator (LMH7324) for our new design for 100 MHz signals. This device supports RSPECL as output type.

We need single ended output (LVTTL) in our application. Can we use PECL to LVTTL converter with this device output to convert LVTTL output.

or is there needed any other converter from RSPECL to LVTTL converter. Can PECL devices support RSPECL output levels as its input ?

Please suggest, how can we change this RSPECL output to single ended (LVTTL) output? There is no any device looking to convert this RSPECL to LVTTL level.

Best regards

  • 0
    TI__Guru 60536 points

    Hello Ishwar,

    The output buffers of the LMH7324 only allow for a 400mV shift, so you cannot get a full 3V swing.

    Have a look at the TLV3601 - that has a full rail-to-rail input and output swing and should handle 100MHz with ease.

  • 0 in reply to Paul Grohe
    Prodigy 160 points

    Hi 

    Thanks for update !

    Can you pls support any RSPECL to LVTTL converter to change single ended output and can be interface with RSPECL output of this device.

    The suggested part TLV3601 is with single supply and our input is up to 5V and output needed as 3.3V level.

    Best regards

    Ishwar

  • 0 in reply to Ishwar Sharma
    TI__Guru 60536 points

    Hi Ishwar,

    You can also power the TLV3601/2 with 5V and attenuate the 5V output down to 3V with a simple resistor divider between the output and the logic. That is a common trick.

    Can you go LVDS to LVTTL?

    With the divider trick, you eliminate another delay stage.