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LT6233-10, Bandwidth issue

hello all, 

I'm using a LT6233-10  for my project and I try to test it before.

My need is 2MHz bandwith with a Gain at 200 and  enable pin.

I'm facing an issue about the Bandwidth. the schematic is below.

I try to test it as a buffer, it work, I can have the same amplitude until the 2MHz with an input at 1Vpp

Then with this schematic, the signal is cut around 500KHz.

The input is a function generator, HiZ output. 20mVpp with an offset at 1.65V.

Vref = 1.65V

Vcc = 3.3V (I also try 5V, always single supply)

I try with 40 gain.

A also try with a non inverting mouting, same issue.

If I chose a lower gain, 4 for exemple it work.

The datasheet give this amplifier for 320MHz GBW. 

I don't understand where I'm wrong. I test it with LTspice and it work.

please, if anyone see where I'm wrong, con you helpe me please.?

Parents Reply
  • Ho thank for your answer. 
    your right about the gain =200. But in my test, I’m with a gain at 40, I must have 8mhz bandwidth, but I don’t event have 1mhz.

    do you have an other ref, the ltc6250 have a consumption too High even in shutdown.

    I need a very low power mode.

    I talk about 2mhz bandwidth to have some marge. But 1mhz , 1.5mhz is ok.

    but I don’t have it yet