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Need to find a TI device to translate TTL logic to Bipolar logic to drive a CCD image sensor

Carlos Barberis
Prodigy 10 points
Other Parts Discussed in Thread: LM5110, LM5112, TIDA-00448, CSD87353Q5D

Hi all,  I am trying to find a similar device to the Intersil  EL7457 which is a pin driver / CCD driver translator unfortunately this device is quite troublesome and difficult to use and forget getting any support from Intersil
Here is what I need to do:
I have 4 TTL logic signals that have to be translated (non-inverting mode) from 0V-5V to -5V to +8.5V at a toggle rate as high as 10.0MHz Tr and Tf should be < 15 nS Ideally if I could swing from +11V to -6V that would cover all my bases I am having an extremely difficult time finding a device as such, I am sure that Intersil cannot be the only one out there?  I thought about using the LM5110 gate driver from TI but I am not sure about getting this to work at 10MHz and being able to translate the same levels I need. ANY HELP OR HINTS WIIL BE GREATLY APPRECIATED
  • 0
    TI__Expert 6335 points

    Carlos,

    Unfortunately, the level translators that I support can not produce a signal swing from -5.0V to +8.5V.

    I used TI's Competitive Cross Reference Search Tool using Intersil's Part Number, and it directed me to the MOSFET Drivers portfolio.

    I then searched their portfolio for outputs that support negative voltage and got the following products. It seems that the LM5112 might be compatible (Let VCC = +8.5V and VEE = -5.0V, edge rates are <15 ns using 2 nF load). Since I am not familiar with this product portfolio, I am going to move this thread to the appropriate e2e forum for accurate support. Thanks.

    Best Regards,

    Nirav

  • 0 in reply to Nirav Patel
    TI__Mastermind 25570 points
    Hi Carlos

    You may find the block diagram of TIDA-00448 in the document at www.ti.com/.../tiduaj2a.pdf of interest. It's not an integrated end to end solution but it should offer 10MHz rates and the rise and fall times would be dictated by the external totem pole driver. the CSD87353Q5D devices used in this example are probably a bit slow for your application.

    Regards
    Colin