How can I see whether an op amp has RR input performance and what are the parameters involved?
RR Input or RR Ouput or both rail to rail input and output (RRIO) op amps are those op amps whose input and output signal can swing almost to the supply rails. This helps you to operate your amp at lower supply voltage, swing closer to the rails and provides wider dynamic range.
On our DS, you can notice RRIO amplifier has smaller headrooms compare to non RR amp. Please see image below. Headrooms from supply rails for output and input are the numbers that can tell op amps are RR or not. Selection Table for Rail-to-Rail Amplifiers | Parametric Search | Analog Devices
Hallo Phil, I’m not sure whether your answer was automated or not. However, I’ll try this - my question was: I couldn’t find an OPA with a RR input specified – or have I overlooked something?
Ps I choose a ADA4610-1 does this have a RR input??
Gesendet: Mittwoch, 29. Juni 2016 16:37
An: Halford, Bernard
Betreff: Re: - How can I see whether an op amp has RR input performance and what are the parameters involved?
reply from iamPhil<https://ez.analog.com/people/iamPhil?et=watches.email.thread> in Amplifiers - View the full discussion<https://ez.analog.com/message/260743?et=watches.email.thread#comment-260743>
To clarify what Phil said, from the parametric search table, you would want to look at 3 parameters: Rail to Rail, Input Headroom from V+, and Input Headroom from V-. For the rail to rail section, you would want to select "Both" in order to get the list.
Rail to rail input amplifiers are capable of accepting inputs that include the supply voltages. This would mean that you would expect both the input headroom from V+ and input headroom from V- to be 0V. The parametric table at this link will show you that:
Selection Table for Rail-to-Rail Amplifiers | Parametric Search | Analog Devices
The ADA4610 is not rail to rail input. What are the specifications you need for your amplifier? If you could give me more information about what you need, I can help you find the best amplifier for your application.
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