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Connecting voltage supply to the op amps on a 4th order filter.

Emmanuel Mendez Alicea
Prodigy 80 points
Other Parts Discussed in Thread: OPA2353, OPA353

Hello, I'm using 2 OPA353 for a 4th order filter. This op amp range from 2.7 to 5.5 for a voltage source. I also have a amplifier. Can I connect a same voltage source for both op amps? Let's say a 5V source for the two OPA353? Or a 15V for both op amps and the instrumentation amplifier?  The amplifier voltage supply range from 5-15V. I'm new on this topic so I don't know much, suggestions are welcome. 

  • TI__Guru* 93105 points

    Hello Emmanuel,

    Indeed, the same +2.7 V to +5.5 V power supply can be used to power two separate OPA353 op amps. Just make sure that each +V pin has its own power supply decoupling capacitor. Each one should connect from the +V pin to ground via very short PC board traces. Also, instead of using two separate OPA353 op amps, you could use the OPA2353 dual op amp if your layout will accommodate it.

    Do not connect the OPA353 op amps to the +15 V supply used for the instrumentation amplifier. That would over-voltage the op amps and damage them.

    Regards, Thomas

    PA - Linear Applications Engineering