Identifying a Motolora chip - MC14544?

From: Tony Duell <>
Date: Tue Feb 25 17:55:01 2003

> >IIRC, the 14412 didn't demodulate CCITT tones reliably at 300 baud. The
> >better-designed UK modems that used this chip at all used it for the
> >modulator only and used something like an XR2211 for the demodulator.
> Ahh, That explains why it was allways fussy about signal levels. The data
> sheet said that it could do it, and I had to alter the level of the

YEs, that's what the data sheet claimed. But like you, I found it to be
'touchy'. It would work on the bench when given 'perfect' signals at the
right levels, it didn't like the signal from the accoustic coupler...

Received on Tue Feb 25 2003 - 17:55:01 GMT

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