I want to find an op amp with the feature rail to rail in and out , single supply ,sr>=300v/us ,low noise

Penghm,

Is this inquiry related to your inquiry last month (http://e2e.ti.com/support/amplifiers/high_speed_amplifiers/f/10/p/108255/382310.aspx#382310)?

TI does not have any rail-to-rail input (and output) op amps that have SR >300V/us.

From our previous discussion, to get SR >= 300V/us on a single supply, one option would be the OPA830. The OPA830 input range includes down to its negative rail but. However, the OPA830 would require a positive supply of 7V to extend the maximum positive input up to 5V, which was the high limit of your input signal in the previous thread. Operating the OPA356 at its absolute maximum supply (Vs+ = 7.5V) will extend its maximum positive input to 5V (Vs+ - 1.5V), but I would not recommended operating an op amp at its absolute maximum supply rating. Line transients or other events may raise the voltage above the maximum rating.

The OPA830 has an input voltage noise of 9.2nV/rt(Hz). Lower voltage noise options would require a negative supply to get the input voltage range down to 0V.

I assume you still want >300V/us slew rate? Please take a look at the OPA836. You will be able to buffer a 0.5-3.8V signal while operating on a single 5V supply. Take a look at Figure 41 in the datasheet which shows the input-referred voltage noise vs frequency. Voltage noise is 4.6nV/rt(Hz) at f>100kHz.

Penghm,

I do not understand the question. The slew rate of the OPA836 is listed in the datasheet.