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~National t ~ Semiconductor Active Filters AF102 Dial Tone Reject Filter General Description The AF102 is a fourth order elliptic highpass filter designed to reject frequencies below 650Hz.
This filter rejects the 350Hz and 440Hz dial tone frequencies present on a telephone line.
The unit is fully tuned and requires no external components - only input, output and power supply connections.
Connection Diagram Features • Fully tuned • High input impedance • Low output impedance • Wide power supply range ±5V to ±18V ~ IZI k1UTPUT!-INZ LPZ LPI -INI HPZ 111 111 @±l NC 13124 23 22 21 20 19 18 17 16 15114 4th OROER HIGH PASS ELLIPTIC FILTER ~J I10 111 121 02 ~ 01 ~ 112 BPI NC NC ...

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