Luke Denton skrev:
Use 4000 series chips due to the wide supply range and the low current consumption. E.g a CD4046 PLL using the VCO for your frequency followed by a decade counter CD4017 with scaled resistors to make a simple lookup sine generator. Lastly add a RC filter to smooth the sine according to your needs. It will however not generate sine with very low distorsion. You may need to add a low-power amplifier if you need low output impedance
Regards
Klaus
Well depends if you would define 2mA as low power consumption? The 4000 logic solution can be done with less than around 20uA.
(and that will be a educational project also - won't be if yuo just use a custom chip)
Regards
Klaus
Can anyone recommend a low power analog circuit that will run on four AAA cells and generate a sinewave of several volts amplitude (or more) that can be varied over the range of 10-100Hz?
Minumum component count is preferred. I usually use an XR2206 for this but want to reduce current draw to the minimum possible, whatever that may be in practical terms.
Thank you,
Luke Denton
"Luke Denton" <
** e If you can stretch to 5 AAA cells or a 9 volt battery:See :
.......... Phil
"Klaus Kragelund" ...
** Sure sounds a lot more complicated than using one 14 pin analogue IC with less than 2 mA drain to get low THD and low output Z............ Phil
"Luke Denton" a écrit dans le message de news: snipped-for-privacy@4ax.com...
Use a nanowatt series PIC microcontroller, with a wake up every millisecond or so just to update a software-based DDS generator. You will just have to add an external R/2R network to implement a low cost DAC. If the output impedance can be high you will end up with a design under 1$, and a power consumption under may be 100µA.
Yours,
-- Robert Lacoste ALCIOM - The mixed signal experts www.alciom.com
** But in no respect is equivalent.
......... Phil
CMOS opamp, Wein-bridge oscillator.
Excuse me Phil, but what specific IC are you referring to below?
Thank you,
Luke
"Luke Denton"
** Cut out the top posting.** Is my reply directed to YOU two days ago invisible ?
Mine was your first reply.
........ Phil
Three digital pots and a micro? Triple ganged pot?
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Pretty hard to beat a 2N5088 at a couple of micro-amps wired as phase shift oscillator with meg-ohm size resistors.
-- Steven D. Swift, novatech@eskimo.com, http://www.novatech-instr.com NOVATECH INSTRUMENTS, INC. P.O. Box 55997 206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA
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