AF103 Datasheet | National Semiconductor

Description The AF103 is a fourth order elliptic low pass filter designed to reject frequencies above 1200 Hz and pass signals- below 950 Hz. This filter is used to separate the low band of frequencies from the high band in a Dual Tone Multi Frequency (DTMF) Touch Tone® receiver. The unit is fully tuned and requires no external ponents - only power supply, input and output connections. Features - Fully tuned - High input impedance - Low output impedance - Wide power supply range Connection Diagram ~ 121 HP2 -IN2 ij UTPUTll Pl -11.11 HP2 111 111 ~ NC 241 23 22 21 20 19 18 17 16 1514 13 ±5V to ±18V 4th ORDER l OW PASS el LIPTIC Fil TER J l I10 111 121 ru122 Q2 Ql~. 112 BPI NC NC Ceramic Dual-In-Line Package HY24A AF103CJ Note: Only those pin functions marked with a 0 need be connected for normal operation. All other pins are internal connections or test points; DO NOT USE. 14-26 ®...