Other Parts Discussed in Thread: ADS1299, LP2985
Hello,
I have designed and manufactured the following circuit:
There I use a LP2985 LDO to power my ADS1299 with 3.3V, the input voltage of the LDS is 5V. However I am having trouble with the output voltage. It usually floats around 1.5-1.7V, instead of the 3.3.
I have tested the circuit with many different capacitors, both tantalum and ceramic ranging from 1uF to 10uF, and had problems with all of them, some values (1uF) resulted in an unstable voltage over 4V.
I have also tried to isolate the problem by placing only the LDO and the input, output and bypass capacitor on the board, but with similar resuld.
Am I doing something wrong? Is the design wrong?
Thanks in advance