I'm designing a PCB with four AD8618, single supply +3V and all channels as voltage followers (see attached figure, U3-U6). U1 is the voltage regulator in the circuit, and the output is decoupled with a 4.7uF tantalum cap (C2). Now my question is whether I actually need the decoupling caps on the op-amps (C5-C12). I'm using two decoupling caps per op-amp, one 0.1uF ceramic and one 10uF tantalum. The PCB traces between U1 and U4 (as well as U1 and U5) is approx. 4 cm. The traces between U1 and U3 (as well as U6) is approx. 10 cm.
If you please have some ideas on this I would be very grateful!
Thanks in advance,
Thank you again for your message. TRRS means the 4-conductor audio cable, stereo + mic (like the one used in smartphones).
The highest freq. is around 10k, and the signals are DC coupled at 1.5V via a reference voltage.
I believe I will go for the AD8604, since the footprint is the same and it is more than half the price of the AD8618.
Please let me know if you have any additional comments on this.