[time-nuts] Need tiny 5MHz 10x amplifier

[Charles Steinmetz]

I wrote:

>The LT1720** works on a 3.3v single supply, and has internal 
>hysteresis.  Just ground one input, ground the other through a 
>resistor, and attach your AC-coupled signal (best if you can use 
>equal resistors to ground on the two inputs, but if the signal 
>termination is 50 ohms the other input can be 0 ohms to ground; even 
>1k ohm would probably be OK).
>
>Note that the LT1720 is specified for inputs to 100mV below V- 
>(ground, in this case) and your 200mVpp signal pushes it right to 
>the limit.  A bit of attenuation is probably a good idea.
>
>**  The 1720 is a dual comparator, so you'd have an extra to use or 
>ignore.  Alternatively, the 1719 is a single with extra features 
>that you could ignore.  Either should work well in your application.

The TLV3501 from TI may be an even better choice.  It has almost 
exactly the same amount of internal hysteresis as the LT1720/1719 
(which I am convinced is largely responsible for the friendly 
performance of the LT parts, along with the right amount and internal 
distribution of gain and freedom from internal thermal 
feedback).  Its input range also extends to 200mV below V-, twice as 
far as the LT parts, and it is a single (TLV3502 is the dual).  Its 
input leakage current is vanishingly small, so unequal resistances at 
the inputs will not shift the trip point.  Finally, it is available 
in the smaller SOT23 package (as is the LT1719).

Potentially, lots to like.  I have not used the TI part, so I don't 
know if it is as friendly to apply as the LTs, but others speak well of it.

Best regards,

Charles