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help on LMH6655 Op Amp Datasheet

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mengghee

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hiye everybody,

I have included a link below to the datasheet. I am just quite unsure about a few stuff. in the datasheet, it is written that the absolute maximum Vin differential is +-1.2. does that mean that 1.2v is the maximum value i can put in the positive pin or negative pin ? and also what is the difference between input resistance common mode and differential mode ? i am trying to use this op amp as a comparator to generate a pwm. and the datasheet of the sawtooth generator states that i need a load resistance of at least 50kohm. will this fit into the spec of the op amp ? thank you



http://www.datasheetcatalog.com/datasheets_pdf/L/M/H/6/LMH6655.shtml


regards,
mengghee
 

narccizzo

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Hi
the +-1.2 refers to the maximum voltage diference between the inputs that means you can put 2.8V in the + input but you have tu put more than 1.6 or less than 4V in the - input. the diferential input resistance is the resistance that you will measure if you put the ohmeter between the + and the - inputs (if that would be possible), and the commun input resistance is the resistance that you will measure if you put the ohmeter between the + or the - inputs and GND (if that would be possible). you have to be a little more specific about the 50K load resistance i think that refers to the output impedance of the opamp.
hope this help..
 

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