LTC1063 Alternative?

[thehallofshields]

I want to experiment with a clock-controlled cutoff-frequency low-pass filter...

But these bastards are going for like $10 a piece!

Also is the Clk/Corner F a 1:1 Ratio?

[~arph]

You can do PWM controlled with a few opamps and a switch/fet

[anotherjim]

Texas MF10CCN? One of the oldest.
Maxim have a range close in price but only smd I think.

As ~arph said, you can roll your own.

[PRR]

> $10 a piece!

And your music isn't worth ten bucks?

You get a LOT of function for your ten bucks.

5th-order Butterworth is NOT a simple thing to do in PWM.

> is the Clk/Corner F a 1:1 Ratio?

Read the specs.

http://www.linear.com/product/LTC1063
http://www.linear.com/docs/3153

[newperson]

Utsource has them for $5 + shipping.  If you are getting some more items anyway.