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Part Name
Description
CD22859 View Datasheet(PDF) - Intersil
Part Name
Description
Manufacturer
CD22859
Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator
Intersil
CD22859 Datasheet PDF : 5 Pages
1
2
3
4
5
Functional Diagram
C1 3
C2 4
C3 5
C4 9
CD 15
V
DD
R1 14
R2 13
R3 12
R4 11
OSC 1 7
OSC 2 8
CD22859
V
DD
COUNT CONT.
COL. DIVIDER
C1-46 C3-38
C2-42 C4-34
COL
SENSE
COL INH
÷
32
D
A
ROW
SENSE
ROW DIVIDER
R1-80 R3-66
R2-73 R4-59
COUNT
CONT.
÷
32
D
A
ROW INH
ENABLE
OP AMP
OSC
÷
2
MUTE
CONTROL
V
DD
1
16
V
OUT
R
X
10
T
X
2
V
SS
6
d
a
D
1
L1
G
1K
D
2
1.65K
2.55K
I
51K
g
T
X
R
X
f
F RR
B GN
GN
I
T
V
DD
+
R
X
T
X
/CD
1
OSC1
A
K
a
b
L2
c
C
2
R
1
C
1
V
1
L
4
R
2
V
2
C
3
L
1
L
2
D
3
NETWORK
8
OSC2
V
OUT
R
L
R
4
R
3
V
SS
C
D
4
FIGURE 2. INTERFACE WITH STANDARD K500 TELEPHONE NETWORK
KEYPAD
123
456
789
*
0#
4-130
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