>
>>Anyone know of a small,low power, SMT, audio frequency voltage controlled
>>oscillator IC?
>>I'm trying to generate a swept sinewave from 100Hz to 10Khz driven from a
>>12 bit DAC. I've found a bunch of serial input types, but unfortunately I'm
>>out of I/O on this design - just one DAC remaining available.
>>
>>TIA
>>
>>Bob
>
> Could you talk to a serial-data DDS chip? They're almost perfect sine
> generators.
>
> I assume you don't have enough compute power to play a swept sine
> directly on a DAC!
>
> John
>I looked at a couple of DDS chips. They'd be ideal except all the ones I
>saw need serial data, serial clock, and an enable or latch of some sort - 3
>I/O pins I don't have :(
>And yes, I did try to generate a sine in software with a look up table,
>phase accumulator etc. Not even.
>Thanks for the reply
>Bob
Belated followup:
Thanks for the DDS idea John. I ended up shifting some I/O around and bit-banged the SPI interface to an AD9833 - works great!
Bob