bote@uunet.uu.net (John Boteler) (03/10/91)
I just received the preliminary data sheet from Sierra Semiconductor
on their Caller*ID demodulator IC. For the benefit of you eager beaver
engineers out there, I have provided a summary of the cogent
specifications.
In short, this CMOS chip goes between the phone line and a serial
buffer, decoding the Caller*ID data for you; coincidentally, it can
perform what Sierra calls "Call Progress", but the preliminary data
sheet does not elaborate. You must stick a microcontroller on the
serial output pin to catch the data pouring out of it.
You have your choice of fourteen pin DIP or SMT package or eight pin
DIP. The eight pin version does not provide all features, such as
"Power Down" due to the reduced pin count.
The power supply is nominally five volts at 7 mA max. The input
impedance of the differential input amp is listed as 100K at 1KC; the
suggested circuit shows a 0.1uF capacitor on each input pin to AC
couple it.
This looks like it will save a lot of grief for someone who wants to
design their own project quickly and cheaply.
John Boteler bote@csense {uunet | ka3ovk}!media!csense!bote
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