Thanks to everyone for all the replies. I think I will prototype the
Maxim part and see if it is superior. It looks like it uses a fraction
of the output of a peak detector to set the comparator level. I like the
idea, it seems like it should eliminate false crossings on noisy high
amplitude signals.

If it turns out to be really good, I may design it in and also put some
pads for a header on the PC board to allow for an emergency piggyback
board with a less integrated solution.

I'll post info on the results of my tests when I get some samples from
Maxim.

Cheerful regards,

Bob


On Wed, Feb 8, 2012, at 11:29 AM, Bob Blick wrote:
> I need to design a device that interfaces to the speed sensor of heavy
> trucks. These are variable reluctance sensors and will remain connected
> to the vehicle's ECU, my circuit will piggyback. These are two-wire,
> differential signals full of common-mode noise and vary in amplitude
> greatly with frequency and also position as the tailshaft bearing wears
> in the vehicle.
>=20
> Right now I am designing the front end and would love to use something
> like the MAX9924 since it makes things simple. But it's a Maxim part
> which I am still hesitant to spec.
>=20
> Parts like the LM1815, LM2907, NCV1124 are all single-ended input. The
> NCV7001 is end-of-life.
>=20
> Any pointers toward a differential VR sensor interface IC?
>=20
> This is a smallish volume product, so I don't expect to be able to get
> any high-volume ABS interface parts. Which at this point are probably so
> highly integrated with other functions as to be unusable to repurpose
> for my use anyway.

--=20
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--=20
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