| Part number | NTE1690 |
|---|---|
| Download | NTE1690 Datasheet (PDF) |
| File Size | 31.70 KB |
| Manufacturer | NTE Electronics (defunct) |
| Description | Integrated Circuit Telephone DTMF Dialer |
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| Part Number | Description |
|---|---|
| NTE169 | Single Phase Bridge Rectifier |
| NTE1691 | Integrated Circuit Telephone Pulse Dialer |
| NTE1692 | Integrated Circuit Telephone Pulse Dialer |
| NTE1693 | Integrated Circuit Telephone Pulse Dialer |
| NTE16 | Silicon Complementary Transistors Low Noise / General Purpose Amplifier |
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.
