Torex make some very nice low noise regulators; the XC6204 series has been around for some years now and appears to offer much lower noise levels than the 723 :-
http://www.torex-europe.com/products/range/125 Click on 'Technical Diagrams' to see the noise plot of the 3V part - sub 1uV /rtHz at all frequencies above 100Hz. One has to assume that the noise specification for the uA723 is per rtHz, in which case the Torex part has lower noise. The uA723 has higher ripple rejection though. The Torex XC6204 is specifically intended for noise-critical applications such as oscillators, PLLs and the like - it's not really a general purpose regulator like the 723. Torex parts are available in the UK (and maybe elsewhere) from Farnell, other distributors also stock them. I suspect that lower noise regulators are now available. regards Grant John Miles wrotre :- What are some of your favorite low-noise regulators? When I made the remark about the uA723, I was specifically thinking of its performance compared to the LT1762. With Cref=5 uF, the uA723's output noise voltage is rated at 2.5 uV from 100 Hz to 10 kHz. The LT1762, which seems to be among Linear's quietest parts, is rated at 20 uV from 100 Hz to 100 kHz, with external bypassing that places most of the noise at lower frequencies. Snake oil or not, that's 18 dB less noise from the 723. There are various hacks like Wenzel's that can clean up after a noisy regulator, but if there are quieter fully-integrated solutions out there I'd like to hear about them. Posted back to the list in case there are other views on the subject... -- john, KE5FX _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
