powering AD8066

hello

i need to know can i powering the AD8066 less then +5V (single supply)?

i have +5V input to my design it very nosiey so i need to add LDO for DC noise filtering

can i get Recommendation LDO for it ?

thanks

Parents
  • Really your best bet is changing amplifiers to something like the AD8397 (less gain-bandwidth product) or AD8030 (closer) or even the AD8022 that at lease works at 4.5V. The AD8066 will probably work at 4.5 but you will have no guarantee of that. If this is some hobby project, give it a try. But if this is for any kind of production circuit, you are better off finding an amp rated to work at a lower voltage. You might also try a passive network, put a big inductor off the noisy 5V, and a big capacitor on the other side of it to make a filtered 5V and stick with the AD8066. You might then do another step with a ferrite bead and yet another capacitor network. Try and figure out what frequency the noise in your 5V supply is. If its high frequencies, you might be able to filter them with relatively small inductors and capacitors. For the best performance, you are right, an LDO (low-dropout) regulator is the safe bet. The AD812 and AD8042 have more gain-bandwidth product but may be so fast they will oscillate in your circuit, depending on the layout. The AD8028 is another candidate that works to 2.7 V. Depending on how noisy your +5V is, you might get away with an LDO set for 4.5V or going to 4V may make a quieter rail.

Reply
  • Really your best bet is changing amplifiers to something like the AD8397 (less gain-bandwidth product) or AD8030 (closer) or even the AD8022 that at lease works at 4.5V. The AD8066 will probably work at 4.5 but you will have no guarantee of that. If this is some hobby project, give it a try. But if this is for any kind of production circuit, you are better off finding an amp rated to work at a lower voltage. You might also try a passive network, put a big inductor off the noisy 5V, and a big capacitor on the other side of it to make a filtered 5V and stick with the AD8066. You might then do another step with a ferrite bead and yet another capacitor network. Try and figure out what frequency the noise in your 5V supply is. If its high frequencies, you might be able to filter them with relatively small inductors and capacitors. For the best performance, you are right, an LDO (low-dropout) regulator is the safe bet. The AD812 and AD8042 have more gain-bandwidth product but may be so fast they will oscillate in your circuit, depending on the layout. The AD8028 is another candidate that works to 2.7 V. Depending on how noisy your +5V is, you might get away with an LDO set for 4.5V or going to 4V may make a quieter rail.

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