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MV5089 - DTMF Generator

General Description

This input has an internal pull-up resistor to Voo.

When connected to Vss no tones are generated by any key depression allowing the keyboard to be used for purposes other than DTMF signalling.

Key Features

  • Pin-far-Pin Replacement for MK5089.
  • Low Standby Power.
  • Minimum External Parts Count.
  • 2.75V to 10V. Operation.
  • 2-of-8 Keyboard Input.
  • High Accuracy Tones Provided by 3.58MHz Crystal Oscillator.
  • Pin-Selectable Inhibit of Single Tone Generation Fig.1 Pin connections - top view.

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Datasheet Details

Part number MV5089
Manufacturer Plessey
File Size 163.58 KB
Description DTMF Generator
Datasheet download datasheet MV5089 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MV5089 MV5089 DTMF GENERATOR The MV5089 is fabricated using Plessey Semiconductors' ISO-CMOS high density technology and offers low power and wide voltage operation. An inexpensive 3.58MHz TV crystal completes the reference oscillator. From this frequency are derived 8 different sinusoidal frequencies which, when appropriately mixed, provide Dual-Tone MultiFrequency (DTMF) tones. Inputs are compatible with a standard 2-of-8 active-low keyboard and the keyboard entries determine the correct division of the reference frequency by the row and column counters. D-to-A conversion, using R-2R ladder networks, results in a 'staircase' approximation of a sinewave with low total distortion.