To select an Op-Amp it is needed first to define the circuit specifications.
OK, what are the op amps available at school?
as i looked at the datasheets for the availible opamps, i noticed none of em are rail to rail so we got the green light to get one from somewhere else (local electronics store preferably)
Are you sure that you need a R-R op-amp?
Is 4.5V the peak, RMS o peak-to-peak voltage?
peak to peak with the zero point at 4.5v. the peaks would be at 0v and 9v
This does not make a ... lot of sense. The range of a 4.5Vpp signal, centered on 4.5V is between 2.25V and 6.75V. What peaks are on 0V and 9V?
Given your requirements, you don't need anything special as far as speed is concerned.
thanks! that makes searching a lot easyer.
Additionally:
1)our supply voltage is 9v only, not -9v. the -bit isnt used.
2)we use it at the end of an 8 bit r2r dac connected to an arduino as an output amp i presume.
with it we have to 'draw' a house every 2ms with the shortest delay between a voltage change beeing 50 microseconds.
and we need to generate a 480hz sine wave with an amplitude of 4.5v, this is why we needed the rail to rail opamp.
to the question of hero999, no, this has not been tought in class (yet i presume)
What is the meaning of the sentence in bold?
If all codes of 8-bit are used, the step change, for 480Hz signal, is every about 8 micro-seconds. Is the signal filtered/integrated before the amplifier?
What is the role of this stage? Is it a buffer, a step voltage amplifier, an integrator, an amplifier of sinus signal or something else?
Also the characteristics of the input source and the output load have to be defined.