>> John Larkin wrote:
>>> On 7 Jul 2008 17:04:56 GMT, Scott Seidman
>>> <namdiestt...@mindspring.com> wrote:

>>>> Joerg <notthisjoerg...@removethispacbell.net> wrote in news:x26ck.31503
>>>> $ZE5.27...@nlpi061.nbdc.sbc.com:

>>>>>  Noise from clocks and stuff: None.
>>>> That's not my experience.  Switched cap filts are famous for clock bleed
>>>> through, and you need to be sure your circuit can tolerate this.  The clock
>>>> frequency is usually an order of magnitude or more higher than the filter
>>>> freq, so you can usually filter out the bleedthrough with an RC.
>>> Also famous for aliasing inputs, aliasing power supply noise, and
>>> making a heap of noise of their own. But the programmability is nice.

>> Look at the bright side: You can make really nice mixers and stuff with
>> them. If they just weren't so darn expensive.

>>> The world needs a general-purpose programmable continuous-time lowpass
>>> filter IC. Really.

>> If you use the R2R ladders of DACs you could make one around chips like
>> these:
>> http://datasheets.maxim-ic.com/en/ds/MAX274-MAX275.pdf

>> Of course, then you'd be on the phone with Rebecca all the time.

> MSOP-8:

> V+
> V-
> GND
> IN
> OUT
> CLK
> DATA
> CS-

> SPI interface sets pole/zero locations and gain.

> Why not?