mk5087 ETC-unknow, mk5087 Datasheet - Page 4

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

PIN FUNCTIONS
ROW AND COLUMN INPUTS
keyboard, single contact (form A) keyboard and electronic
input. Figures 3 and 4 show these input configurations, and
Fig. 5 shows the internal structure of these inputs.
when any single button is pushed. Single tones are generated
when more than one button is pushed in any row
PIN
2
3,4,5,9
7,8
10
11,12,13,14
15
16
These inputs are compatible with the standard 2-of-8
When operating with a keyboard, dual tones are generated
COL
V
V
V
V
Figure 3: Keyboard configuration
DD
SS
DD
SS
Figure 4: Electronic input
NAME
V
XMITR
Column 1-4
V
OSC In,
OSC Out
Mute
Row 1-4
Single Tone
Inhibit
Tone Out
DD
SS
CLASS A KEYBOARD
2 OF 8 DTMF KEYBOARD
DESCRIPTION
Positive Power Supply
Emitter output of a bipolar transistor whose collector is connected to V
no keyboard input this output remains at V
output to a high impedance state. The state of Single Tone Inhibit input has no
effect on XMITR output.
These inputs are held at V
1
Negative Power Supply (OV)
On-chip inverter completes the oscillator when a 3,579545 MHz crystal is
connected to these pins. OSC In is the inverter input and OSC Out is the output.
This CMOS Output switches to V
keyboard input. This output is unaffected by the state of Single Tone Inhibit.
These inputs are held at V
1
This input has a pull-up resistor to V
single or dual tones may be generated. When Vss is applied dual tones only are
generated and no input combinations will cause generation of a single tone.
Emitter output of a bipolar NPN transistor whose collector is tied to V
this transistor is from an op-amp which mixes, and regulates the output level of,
the row and column tones.
/
/
2
2
V
V
DD
DD
COLUMN
ROW
) when tied to a ROW input.
) when tied to a column input.
ROW
COL
ROW
SS
DD
by resistors R
by resistors RC and sense a valid logic level (approx
or column. No tones are generated when diagonallypositioned
buttons are simultaneously pressed.
column tone. Inputs to multiple columns generates no tone. An
electronic input to a single row generates no tone and a single
row tone may be generated only by activating 2 columns and
the desired row.
SS
An electronic input to a single column generates that single
COLUMN
with no keyboard input and to V
DD
INPUT
INPUT
ROW
and when left unconnected or tied to V
DD
R
Figure 5: Row and column inputs
and sense a valid logic level (Approx
V
V
and a keyboard input changes the
DD
SS
R
R
R
C
PROTECTION
PROTECTION
STATIC
STATIC
DD
DD
DD
with a
. Input to
. With
Row input
sensing circuit
Column input
sensing circuit
DD
,
MV5087
3