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Query on equivalent part of BUF634 in either 4 channel or 2 channel

padmaja n
Prodigy 30 points
Other Parts Discussed in Thread: BUF634, OPA2691, OPA2690, LMH6574
Dear Sir
I am using a video buffer BUF634 in between video output and ADC input.
In my application i am getting 4 video outputs, for each output before giving to ADC input i am using BUF634 for each video channel.
In between to reduce board size i tried to use OPA2690 and even OPA2691, it didnot work for me as BUF634 worked. Then i revert back to again 4 numbers of BUF634.
My application needs very low noise components. Can you please suggest a component in place of BUF634, which is multichannel but electrically it should behave the same way as BUF634. Preference is 4 channel then only two channel video buffer.
Kindly suggest.
  • 0
    TI__Guru* 93105 points

    Hi Padmaja,

    I support the BUF634 for Precision Analog. We don't offer a multi-channel version of the product. Although I am not directly associated with the video multiplexer products, could you consider using a 4:1 video multiplexer such as the LMH6574? It has a buffered output capable of providing up to +/-80 mA.

    http://www.ti.com/lit/ds/symlink/lmh6574.pdf

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 30 points

    Dear Sir

    Just now i have gone through your reply. Thanks for the reply.

    Mine is 3Vpp, can you please suggest 3Vpp component.

    Thanks

  • 0 in reply to padmaja n
    TI__Guru* 93105 points

    Hi Padmaja,

    The LM6574 should handle your 3 Vpp (+/-1.5 Vp) input signal if a +/-5 V supply is used. The no-load output can be as high as +/-3.53 V minimum, and the 100-Ohm load output can be as high +/-3.17 V minimum, both across temperature. The common-mode input range (CMIR) is rated at +/-2.5 V which is fine for the +/-1.5 Vp input. You can set the gain as needed providing you don't violate the output swing range of the amplifier.

    Please note that the LM6574 is supported by TI's High-Speed Amplifiers group. They have an E2E forum and should be able to provide more detailed information about the product than I am able to from the Precision Amplifiers product forum. Here is link to their forum should you need it:

    Regards, Thomas

    PA - Linear Applications Engineering