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OPA209 unity gain oscillation

Bo Dong26
Prodigy 250 points
Other Parts Discussed in Thread: LM7301, OPA209

Hi,

I am using an OPA209 to build a 2.5V voltage reference. I use two 10kohm resistors to divide the 5V supply voltage and send it to the non-inverting input of an OPA209. The inverting input is shorted to the output. But at the output, I got 1MHz oscillation and the amplitude is about 50mV. When I changed the chip to a LM7301, the oscillation was gone. 

Thanks to any help.

Bo.

  • 0
    Prodigy 190 points
    First, the datasheet suggests placing 0.1uF decoupling caps at the power supply rails, physically close to the IC, as is often standard practice.

    Next, what is the load you are driving? Is it capacitive? If you look at Fig 30, for a G=1 configuration things get quite "ringy" around a Cload of as low as 1.4nF.