mk5087 ETC-unknow, mk5087 Datasheet - Page 2

• Manufacturer Part Number: mk5087
• Description: Dtmf Generator
• Manufacturer: ETC-unknow

FEATURES
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.
single contact (form A) keyboard. The keyboard entries
determine the correct division of the reference frequency by
the row and column counters.
a staircase approximation of a sinewave with low total distortion.
and temperature range are maintained within industry
specifications.
Pin-for-Pin Replacement for MK5087
Low Standby Power
Minimum External Parts Count
3.5V to 10V Operatlon
2-of-8 Keyboard or Calculator-Type Single Contact (Form
A) Keyboard Input
On-Chip Regulation of Output Tone
Mute and Transmitter Drivers On-Chip
High Accuracy Tones Provided by 3.58MHz Crystal
Oscillator
Pin-Selectable Inhibit of Single Tone Generation
The MV5087 is fabricated using ISO-CMOS high density
Inputs are compatible with either a standard 2-of-8 or a
D-to-A conversion, using R-2R ladder networks, results in
Frequency and amplitude stability over operating voltage
OSC
OUT
OSC
IN
V
V
DD
SS
1
KEYBOARD LOGIC
KEYBOARD LOGIC
1
COLUMN INPUTS
ROW INPUTS
2
2
Figure 2: Functional block diagram
3
3
DTMF GENERATOR
4
4
4
R
R
R
R
R
R
R
R
R
R
R
R
C
C
C
C
MV5087
V
COUNTER
COUNTER
COLUMN
SS
ROW
V
V
DD
DD
SINGLE TONE
INHIBIT
TRANSMIT/MUTE
APPLICATIONS
DTMF Signalling for
COUNTER
COUNTER
LOGIC
WAVE
WAVE
SINE
SINE
Telephone Sets
Mobile Radio
Remote Control
Point-of-Sale and Banking Terminals
Process Control
MV5087
CONVERTER
CONVERTER
COLUMN 1
COLUMN 2
COLUMN3
OSC OUT
Figure 1: Pin connections - top view
D/A
D/A
OSC IN
XMITR
+V
V
V
DD
SS
REF
+
-
1
2
3
4
5
6
7
8
V
V
DD
DD
16
15
14
13
12
10
11
9
TONE OUT
SINGLE TONE INHIBIT
ROW 1
ROW 2
ROW 3
ROW 4
MUTE
COLUMN 4
TONE OUT
XMITR
MUTE OUT
DP16
MP16
DS3125-2.0 June 1993
MV5087
1