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4-126
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-800-4-HARRIS or 407-727-9207
|
Copyright
Harris Corporation 1999
CD22859
Monolithic Silicon COS/MOS Dual-Tone
Multifrequency Tone Generator
The CD22859 is a CMOS dual-tone multifrequency (DTMF)
tone generator for use in dual-tone telephone dialing
systems. The device can easily be interfaced to a standard
push-button telephone keyboard to provide enabling
operation directly with the telephone lines.
The CD22859 generates standard DTMF sinusoidal dialing
tones from an on-chip reference crystal oscillator. The
reference oscillator uses an inexpensive 3.579545MHz color
TV crystal to create highly stable and accurate tones. The
sinusoidal tones are digitally synthesized by a stair-step
approximation.
One of four low-frequency band row tones and one of four
high-frequency band column tones are selected by driving
one of the four row inputs and one of the four column inputs
low. Simultaneous selection of more than one row input
and/or more than one column input will inhibit tone
generation, or generate a single-tone sinusoid. These
operating modes are described in the functional truth table.
Control logic is included to allow easy interface to standard
K500-type telephones. Two CMOS outputs (T
X
, R
X
) capable
of driving external pnp receiver and transmitter muting
transistors are provided. A low input to the CD pin inhibits
tone generation, turns off the reference oscillator and causes
T
X
and R
X
outputs to go to logic `0'. During tone generation
mode, CD = 1 and T
X
, R
X
= logic 1.
The row, column and CD inputs are provided with pull-up
resistors to allow the use of SPST switch matrixes.
Features
Mute Drivers On-Chip
Device Power can Either be Regulated DC or Telephone
Loop Current
Use of an Inexpensive 3.579545MHz TV Crystal Provides
High Accuracy and Stability for all Frequencies
Applications
For Use In Dual-tone Telephone Dialing Systems
Pinout
CD22859
(PDIP)
TOP VIEW
Ordering Information
PART NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
CD22859E
-40 to 85
16 Ld PDIP
E16.3
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
V
DD
TX
C1
C2
C3
V
SS
OSC2
OSC1
V
OUT
R1
R2
R3
R4
RX
C4
CD
Data Sheet
February 1999
File Number
1257.4
[ /Title
(CD22
859)
/Sub-
ject
(Monol
ithic
Sili-
con
COS/
MOS
Dual-
Tone
Multi-
fre-
quency
Tone
Gener-
ator)
/Autho
r ()
/Key-
words
(Har-
ris
Semi-
con-
ductor,
Tele-
com,
SLICs,
SLACs
, Tele-
phone,
Tele-
phony,
WLL,
Wire-
less
OBSOLETE PR
ODUCT
NO RECOMMENDED REPLA
CEMENT
Call Central Applications 1-800-442-7747
or email: centapp@harris.com
4-127
Absolute Maximum Ratings
Thermal Information
Supply Voltage (V
DD
- V
SS
). . . . . . . . . . . . . . . . . . . . . . . -0.5 to 12V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to V
DD
0.5V
Power Dissipation, P
D
T
A
= -40
o
C to 60
o
C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500mW
T
A
= 60
o
C to 85
o
C . . . . . Derate Linearly at 1.2mW/
o
C to 200mW
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .175
o
C
Maximum Junction Temperature (Plastic) . . . . . . . . . . . . . . . .150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300
o
C
Operating Conditions
Power Dissipation Per Output . . . . . . . . . . . . . . . . . . . . . . . .100mW
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications
T
A
= -25
o
C to 60
o
C, All Voltages Referenced to V
SS
= 0V
PARAMETER
V
DD
(V)
MIN
MAX
UNITS
DYNAMIC DC SUPPLY VOLTAGE
Tone Generation Mode with Valid Input (Note 1)
2.5
10
V
Non-Tone Generation (Note 2)
1.7
10
V
DYNAMIC OPERATING CURRENT
Tone Generation Mode
(Outputs Unloaded)
3.7
-
2.7
mA
9.3
-
13
mA
No Keydown Mode
3.7
-
100
A
9.3
-
200
A
Input Pull-Up Current
3 - 10
-
400
A
Input Low Voltage (V
IL
) Maximum
3 - 10
-
0.2V
DD
V
Input Low Voltage (V
IH
) Minimum
3 - 10
-
0.8V
DD
V
Electrical Specifications
T
A
= -25
o
C to 60
o
C
PARAMETER
V
DD
(V)
V
O
(V)
MIN
MAX
UNITS
STATIC TONE OUTPUTS (R
L
= 82
)
V
O
; Dual-Tone Output
3.7 - 9.3
-
350
700
mV
RMS
V
O
(C
L
); Single-Tone Output, Column (Note 3)
3.7 - 9.3
-
300
-
mV
RMS
V
O
(R
L
); Single-Tone Output, Row (Note 4)
3.7 - 9.3
-
260
-
mV
RMS
Distortion (Note 5)
3.9 - 9.3
-
-
10
%
Rise and Fall Time (Dual-Tone Out) (Note 6)
3.9 - 9.3
-
-
5
ms
Pre-Emphasis (Note 7)
3.9 - 9.3
-
1
3
dB
Output Frequency (Note 8)
3.9 - 9.3
-
(Nom. -1%)
(Nom. +1%)
Hz
CD22859
4-128
STATIC MUTE OUTPUT CURRENT
Transmitter
1.7
1.2
-0.5
-
mA
I
OH
(Source)
10
9.5
-3.4
-
mA
I
OL
(Sink)
10
2.5
-
10
A
Receiver
1.7
1.2
-0.5
-
mA
I
OH
(Source)
10
9.5
-3.4
-
mA
I
OL
(Sink)
10
2.5
-
10
A
NOTES:
1. All logic and counters functional.
2. Mute switches remain open.
3. Two or more row inputs low and one column input low.
4. Two or more column inputs low and one row input low.
5. Distortion is defined as: The ratio of all extraneous frequency components generated in the voiceband 0.5kHz to 3kHz, to the power of the dual-
tone signal, measure across R
L
.
where V
1
, V
2
. . . . V
n
are extraneous frequency components in the voiceband 0.5kHz to 3kHz, V
L
is the low-band frequency tone, and V
H
is
the high-band frequency tone.
6. Tone rise time is defined as the time for each of the 2 DTMF frequencies to attain 90% of full amplitude, measured from the time when a row
and column signal are driven low.
7. Pre-emphasis is the ratio of the high-group level to the low-group level.
8. Refer to Figure 1 for standard DTMF frequencies.
9. Corresponds to normal dual-tone operation.
10. Corresponds to single-tone generation mode.
Electrical Specifications
T
A
= -25
o
C to 60
o
C (Continued)
PARAMETER
V
DD
(V)
V
O
(V)
MIN
MAX
UNITS
Distortion=
V
1
2
V
2
2
...
V
n
2
+
+
+
(
)
V
L
2
V
H
2
+
-------------------------------------------------------------------
,
CD22859
4-129
FIGURE 1. BELL AND NOMINAL OUTPUT FREQUENCIES (IN PARENTHESIS) FOR 3.579545MHz CRYSTAL
DTMF GENERATOR FUNCTIONAL TRUTH TABLE
KEYBOARD MODE
INPUTS
OUTPUTS
NUMBER OF
COLUMN INPUTS AC-
TIVATED "LOW"
NUMBER OF ROW IN-
PUTS ACTIVATED
"LOW"
CD
TONE
OSC RUN-
NING
R
X
T
X
X
X
X
"0"
None
No
"0"
"0"
No Key Depressed
0
0
"1"
None
No
"0"
"0"
0
1
"1"
Dual Tone R
A
, C
1
Yes
"1"
"1"
1, 2, 3, or 4
0
"1"
None
No
"0"
"0"
Normal Dialing
One Key Depressed
(Note 9)
1
1
"1"
Dual Tone R
A
, C
B
Yes
"1"
"1"
Two or More Keys In
Same Row
(Note 10)
2, 3, or 4
1
"1"
Single Row Tone R
A
Yes
"1"
"1"
Two or More Keys In
Same Column
1
2, 3, or 4
"1"
Single Column Tone
C
B
Yes
"1"
"1"
Two or More Keys In
Different Rows and
Columns
2, 3, or 4
2, 3, or 4
"1"
None
Yes
"1"
"1"
Where:
X = Don't Care
R
A
refers to Tone Output frequencies corresponding to Row 1, Row 2, Row 3, Row 4; C
B
refers to Tone Output frequencies corresponding to
Column 1, Column 2, Column 3, Column 4.
A = 1, 2, 3, 4
B = 1, 2, 3, 4
A = B, or A
B
1
2
3
A
B
C
D
6
9
#
5
8
0
4
7
*
COL 1
ROW 1
697 (699.1)
1209
(1215.9)
COL 2
COL 3
COL 4
ROW 2
ROW 3
ROW 4
1336
(1331.7)
1477
(1471.9)
1633
(1645.0)
770 (766.2)
852 (847.4)
941 (948.0)
NOMINAL
OUTPUT
FREQUENCY
CD22859
4-130
Functional Diagram
FIGURE 2. INTERFACE WITH STANDARD K500 TELEPHONE NETWORK
COL. DIVIDER
C1-46
C2-42
C3-38
C4-34
COUNT CONT.
COL
SENSE
ROW
SENSE
32
OSC
OP AMP
MUTE
CONTROL
16
1
10
2
6
32
D
A
ROW DIVIDER
R1-80
R2-73
R3-66
R4-59
D
A
COL INH
COUNT
CONT.
ROW INH
ENABLE
2
V
DD
V
OUT
R
X
T
X
V
SS
7
8
11
12
13
14
15
9
5
4
3
V
DD
C1
C2
C3
C4
CD
R1
R2
R3
R4
OSC 1
OSC 2
V
DD
F
GN
GN
C
G
L1
A
K
L2
RR
B
d
a
D
1
D
2
I
1K
1.65K
2.55K
D
3
D
4
a
c
b
C
1
C
2
R
1
V
1
L
1
L
2
NETWORK
V
2
R
2
C
3
L
4
R
X
g
f
51K
R
3
R
4
R
L
V
SS
V
DD
I
T
R
X
T
X
/CD
OSC1
OSC2
V
OUT
1
8
KEYPAD
1
2
3
4
5
6
7
8
9
*
0
#
+
T
X
CD22859
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