Re: BCD with DDS chip
- From: "MooseFET" <kensmith@xxxxxxxxx>
- Date: 29 Mar 2007 06:12:43 -0700
On Mar 28, 5:57 pm, Spehro Pefhany <speffS...@xxxxxxxxxxxxxxxxxxxxxxx>
wrote:
On 28 Mar 2007 06:18:45 -0700, the renowned "MooseFET"
<kensm...@xxxxxxxxx> wrote:
On Mar 28, 2:16 am, Steve Jonson <stevenjon...@xxxxxxxxxxxx> wrote:
I am interested in using something like the AD9851 DDS chip to
generate audio sinewaves but controlling it with BCD swtiches instead
of a serial input. IOW I need it to be independent of a computer or
micro. Can anyone advise where I can find the information to do this,
or provide a summary of the technique?
How good does it have to be? It may be easier to make a DDS circuit
that runs in BCD than to convert for the AD9851. This would be much
more likely if you only need one or two digits and can stand some
distortion.
If you must convert BCD to binary and need to avoid all programable
parts, you may be best off using programable BCD counters to control
how many pulses go into a binary counter.
Do you think that approach is feasible with a 32 bit binary output?
Yes, for very small values of feasible. 7 Minutes isn't that long of
a time.
I wasn't, however, thinking of numbers that long. 6 digits would be
quite reasonable and since the oscillator this is driven from is
likely less accurate than that, this is likely to be enough.
.
- References:
- BCD with DDS chip
- From: Steve Jonson
- Re: BCD with DDS chip
- From: MooseFET
- Re: BCD with DDS chip
- From: Spehro Pefhany
- BCD with DDS chip
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