AF122
AF122 is DTMF Bandpass Filters manufactured by National Semiconductor.
- Part of the AF121 comparator family.
- Part of the AF121 comparator family.
Description
The AF121 and AF122 are 6th order elliptic bandpass filters designed for use with digital DTMF detectors. These filters are patible with tone detector circuits such as the Rockwell CRC8030 and the Mostek MK5102 DTMF digital receivers. The filters provide 40 d B separation between the high and low frequency signaling groups and the dial tone frequencies. The bandpass feature eliminates the need for a separate 'dial tone reject filter_
Features
- patible with Rockwell CRC8030 and Mostek
MK5102
- Gain o±0.5 d B
- Ripple
2 d B peak to peak
- Input Impedance
175 kn min
- Power Supply
±5V to ±18V
Connection Diagram
Dual-In-Line Package
INPUT
VTOP VIEW
Unspecified pins are for internal use only and should not be used for external connection.
Order Number AF121-1CJ, AF121-2CJ AF122-1CJ, AF122-2CJ
14-40
Absolute Maximum...
