AF122 Datasheet Dtmf Bandpass Filters

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: .~,.. LL ~National

This datasheet includes multiple variants, all published together in a single manufacturer document.

Datasheet Details

Part number	AF122
Manufacturer	National Semiconductor (now Texas Instruments)
File Size	128.64 KB
Description	DTMF Bandpass Filters
Datasheet	AF122 AF121 Datasheet (PDF)

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 dB separation between the high and low frequency signaling groups and the dial tone frequencies.

Compatible with Rockwell CRC8030 and Mostek MK5102.
Gain o±0.5 dB.
Ripple 2 dB peak to peak.
Input Impedance 175 kn min.
Power Supply ±5V to ±18V Connection Diagram Dual-In-Line Package INPUT VTOP VIEW GND 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 Ra.

Brand Logo	Part Number	Description	Manufacturer
	AF122	ANTI-SULFURATED CHIP RESISTORS	YAGEO

Part Number	Description
AF120	Generalized Impedance Converter
AF121	DTMF Bandpass Filters
AF100	Universal Active Filter
AF101	High Band Splitter Filter
AF102	Dial Tone Reject Filter
AF103	Low Band Splitter
AF104	DTMF AGC Amplifier
AF105	DTMF AGC Amplifier
AF132	Dual PCM Transmit/Receive Filter
AF133	PCM Transmit/Receive Filters