clark@ssc-vax.uucp (Roger Clark Swann) (02/24/91)
[ The following are some excepts from an article in the Feb. 18, 1991
issue of {Electronic Engineering Times}. ]
Sierra samples chip for caller-ID services ... By Loring Wirbel
Sierra Semiconductor Corp. is sampling an analog front-end chip for
caller-ID services. The chip uses signals sent out by the phone
company between rings and converts the signal to display the calling
number before the user picks up the phone receiver.
The SC11210/11211 caller-ID chip is small enough, with low power
consumption ans surface mount packaging, to be designed into standard
and cordless phones, as well as into the stand alone caller-ID
boxes. Sierra will sell the chip for $2 each.
[ Several paragraphs regarding the controversy over Caller*ID. No
need to repeat that for all of us here. ]
There will be two versions of the chip;
A 14 pin device that supports power-down mode, energy detection,
and call progress detection.
An eight pin version that sacrifices features for reduced size.
Both version store incoming FSK signals in the input duffer, then pass
then through the bandpass filter, where the energy detect settings
determine whether data is blocked or passed.
Roger Swann | uucp: uw-beaver!ssc-vax!clark
@ |
The Boeing Company |