MV5087 Ver la hoja de datos (PDF) - Unspecified

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Fabricante

MV5087

DTMF GENERATOR

Unspecified 

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

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.

Frequency and amplitude stability over operating voltage

and temperature range are maintained within industry

specifications.

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 3.58MHz Crystal

Oscillator

s Pin-Selectable Inhibit of Single Tone Generation

+VDD 1

XMITR 2

COLUMN 1 3

COLUMN 2 4

COLUMN3 5

VSS 6

OSC IN 7

OSC OUT 8

16 TONE OUT

15 SINGLE TONE INHIBIT

14 ROW 1

13 ROW 2

12 ROW 3

11 ROW 4

10 MUTE

9 COLUMN 4

DP16

MP16

Figure 1: Pin connections - top view

APPLICATIONS

DTMF Signalling for

s Telephone Sets

s Mobile Radio

s Remote Control

s Point-of-Sale and Banking Terminals

s Process Control

VDD

OSC

OUT

OSC

IN

VSS

ROW INPUTS

1 23 4

SINGLE TONE

INHIBIT

RR

RR

RR

VDD

RR

MV5087

VDD

KEYBOARD LOGIC

ROW

COUNTER

4

COLUMN

COUNTER

SINE

WAVE

COUNTER

D/A

CONVERTER

VDD

+ VREF

-

SINE

WAVE

COUNTER

D/A

CONVERTER

VDD

KEYBOARD LOGIC

VSS

RC

RC

RC

RC

TRANSMIT/MUTE

LOGIC

TONE OUT

XMITR

MUTE OUT

1 23 4

COLUMN INPUTS

Figure 2: Functional block diagram

1

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