Hi, I'm using the 12VDC SMPS to power the REF02A 5V Precision Voltage Reference.
I'm not sure what impact the SMPS will have on the output of the REF02A. Can anyone advise me on this topic?
In general switchers can be noisy, so I'd say filter the output of the switcher to clean it up before bringing it into the REF02.
I'm going to move this into the Amplifier community in case there is more information from someone there.
Two things. I would use the much newer ADR4550, which has better line reg.
and then use two R-C networks from the 12V to the Vin on the REF.
What freq is the switcher?
Hi Harry, first, thank you for taking the time to answer my question.
I'm currently reading the datasheet for the ADR4550.
The switching frequency is 337kHz.
On all linear regulators and references, PSRR (Power Supply Ripple Rejection) will decrease as frequency
goes up, so at 337kHz, you will not have as much rejection. The REF02 came out in 1975, so it's older
than most engineers. The ADR4550 is two? years old. Another one I like, because of the comp pin,
is the ADR435 which came out in 2003.
Assuming your draw from the ref is less than 10 mA, you could have two, 220ohm/1uF low pass filters
which would help a lot.
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