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The NTE1690 is a monolithic integrated circuit in a 16−lead DIP-type package fabricated using CMOS process and is designed specifically for integrated tone-dialer applications. It offers high-accuracy tones. Digital divider logic, resistive ladder network and CMOS operational amplifier are on a single chip. It uses an inexpensive 3.579545MHz television color-burst crystal. Invalid key entry can result in either single tone or no tone.
VDD = 10.5V
Any input relative to VDD (except pin 10), VN = 0.3V
Any input relative to GND (except pin 10), VN = -0.3V
PD = 500mW
Topr = −30° to +60°C
Tstg = −55° to +150°C
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