[sdiy] Abusing reconstruction filters - LTC1569-6 - Linear Phase, DC Accurate, Tunable 10th Order Lowpass Filter

[Lanterman, Aaron]

They seem to be pretty expensive… around $7 for the first and $20 for the last. The one in the middle is more reasonable, around $2-$4 it seems.

Middle one looks like an op-amp-based-RC kind of filter. The first and last look like they're switched capacitor filters of some sort.

- Aaron

On Nov 1, 2013, at 11:18 AM, cheater00 . <cheater00 at gmail.com> wrote:

> http://www.linear.com/product/LTC1569-6
> http://cds.linear.com/docs/en/datasheet/15696f.pdf
> 
> This family of chips has other interesting parts in it as well:
> 
> LTC1563 - Active RC, 4th Order Lowpass Filter Family —A Single
> Resistor Value Sets the Cutoff Frequency (256Hz < fC < 256kHz)
> http://www.linear.com/product/LTC1563
> http://cds.linear.com/docs/en/datasheet/156323fa.pdf
> 
> I wonder if this chip might be useful given a really slow clock (say,
> from a 555):
> LTC1264-7 - Linear Phase, Group Delay Equalized, 8th Order Lowpass Filter
> http://www.linear.com/product/LTC1264-7
> http://cds.linear.com/docs/en/datasheet/12647fa.pdf