MV5089 Datasheet, PDF (2/7 Pages) Zarlink Semiconductor Inc – DTMF GENERATOR

MV5089
MV5089
DTMF GENERATOR
DS3126-2.0 June 1993
The MV5089 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 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 and amplitude stability over operating voltage
and temperature range are maintained within industry
specifications.
V_DD 1
TONE DISABLE 2
COLUMN 1 3
COLUMN 2 4
COLUMN 3 5
V_SS 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 ANY KEY DOWN
9 COLUMN 4
DP16
MP16
FEATURES
s Pin-for-Pin Replacement for MK5089
s Low Standby Power
s Minimum External Parts Count
s 2.75V to 10V Operatlon
s 2-of-8 Keyboard Input
s High Accuracy Tones Provided by 3.58MHz Crystal
Oscillator
s Pin-Selectable Inhibit of Single Tone Generation
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
V_DD
OSC
OUT
OSC
IN
V_SS
ROW INPUTS
1 23 4
SINGLE TONE
INHIBIT
R_R
R_R
R_R
R_R
KEYBOARD LOGIC
V_SS
V_DD
ROW
COUNTER
÷4
COLUMN
COUNTER
KEYBOARD LOGIC
V_DD
R_C
R_C
R_C
R_C
SINE
WAVE
COUNTER
SINE
WAVE
COUNTER
D/A
CONVERTER
1/2_VDD
+
-
D/A
CONVERTER
KEYBOARD LOGIC
V_SS
V_DD
V_DD
TONE OUT
TONE
DISABLE
ANY KEY
DOWN
1 234
COLUMN INPUTS
Figure 2: Functional block diagram
1