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σ78 overkill in a ADC?

Upgrades for the 78xx and 79xx 3-pin TO-220 fixed voltage regulators

σ78 overkill in a ADC?

Postby Balcmeg » December 25th, 2019, 7:05 pm

Hi Ti,

Would it be overkill to use the σ78 5V instead of a normal σ25 (with 7805) in the digital section of an adc? The Analog section would be supplied by a σ22 at 15V.
/Stefan
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Re: σ78 overkill in a ADC?

Postby amb » December 27th, 2019, 3:07 am

Depends on the implementation of the ADC. For example, if it has a low jitter clock oscillator, then it would benefit from an ultra low noise power supply.
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Re: σ78 overkill in a ADC?

Postby Balcmeg » December 27th, 2019, 3:28 am

amb wrote:Depends on the implementation of the ADC. For example, if it has a low jitter clock oscillator, then it would benefit from an ultra low noise power supply.


Unfortunately not - although it MIGHT be possible to install the omicron1 - but that depends on how it selects the clock frequencies.

I am asking for a bit more information right now, but essentially it uses two pins either high or low to put out 4 different frequencies form a 27MHz crystal. Hopefully, only two of those four possible frequencies are used so I can use outputs from one of the pins as input on omicron1:s SEL input.
/Stefan
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