MV5087 Datasheet (GEC Plessey)

MV5087, DTMF GENERATOR

Positive Power Supply Emitter output of a bipolar transistor whose collector is connected to VDD.

With no keyboard input this output remains at VDD and a keyboard input changes the output to a high impedance state.

The state of Single Tone Inhibit input has no effect on XMITR output.

These inputs ar

MV5087 MV5087 DTMF GENERATOR DS3125-2.0 June 1993 The MV5087 is fabricated using 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 Multi-Frequency (DTMF) tones.

Inputs are compatible with either a standard 2-of-8 or a single contact (form A) keyboard.

The keyboard entries dete

MV5087 Features

* s Pin-for-Pin Replacement for MK5087 s Low Standby Power s Minimum External Parts Count s 3.5V to 10V Operatlon s 2-of-8 Keyboard or Calculator-Type Single Contact (Form A) Keyboard Input s On-Chip Regulation of Output Tone s Mute and Transmitter Drivers On-Chip s High Accuracy Tones Provided by 3.5