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NTE1690

Part Number	NTE1690
Manufacturer	NTE
Description	Integrated Circuit Telephone DTMF Dialer
Published	May 9, 2005
Detailed Description	NTE1690 Integrated Circuit Telephone DTMF Dialer Description: The NTE1690 is a low threshold voltage, field–implanted, m...
Datasheet	NTE1690 PDF File

Overview

NTE1690 Integrated Circuit Telephone DTMF Dialer Description: The NTE1690 is a low threshold voltage, field–implanted, metal gate CMOS integrated circuit in a 16–Lead DIP type package.
This device interfaces directly to a standard telephone keypad and generates all dual tone multi–frequency pairs required in tone dialing systems.
The tone synthesizers are locked to an on–chip reference oscillator using an inexpensive 3.
579545MHz crystal for high tone accuracy.
The crystal and an output load resistor are the only external components required for tone generation.
A MUTE OUT logic signal, which changes state when any key is depressed is also provided.
Features: D 3V to 10V Operation When Genera...

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