DTMF Generator
MV5089
MV5089
DTMF GENERATOR
The MV5089 is fabricated using Plessey Semiconductors' ISO-CMOS high density technology a...
Description
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.
Frequency stability over operating voltage and temperature range are maintained within industry DTMF standards.
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
APPLICATIONS DTMF Signalling for Telephone Sets Mobile Radio Remote Control Point of Sale and Banking Terminals Process Control
DP16
ROW INPUTS 34
SINGLE TONE INHIBIT
~:Co-+"""---l r------,
TONE OUT
KEYBOARD LOGIC ----l
'----;--06~~fBLE
' -_ _ _ _+-o()~~~EY
34
<iiW INPUTS
Fig.2 Functional block diagram
119
MV5089
ABSOLUTE MAXIMUM RATINGS
Voo-VSS Voltage on any pin Current on ...
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