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Semiconductor
CT T ODU MEN E PR PLACE -7747 T 2 OLE RE 0-44 OBS ENDED 1-80 .com s OMM lication harris REC NOSheetal App entapp@ Data entr February 1999 C :c Call or email
CD22859
File Number
1257.4
Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator
[ /Title The CD22859 is a CMOS dual-tone multifrequency (DTMF) (CD22 tone generator for use in dual-tone telephone dialing systems. The device can easily be interfaced to a standard 859) push-button telephone keyboard to provide enabling /Suboperation directly with the telephone lines. ject (Monol The CD22859 generates standard DTMF sinusoidal dialing tones from an on-chip reference crystal oscillator. The ithic reference oscillator uses an inexpensive 3.579545MHz color SiliTV crystal to create highly stable and accurate tones. The con sinusoidal tones are digitally synthesized by a stair-step approximation. COS/ MOS One of four low-frequency band row tones and one of four Dual- high-frequency band column tones are selected by driving one of the four row inputs and one of the four column inputs Tone Multi- low. Simultaneous selection of more than one row input and/or more than one column input will inhibit tone fregeneration, or generate a single-tone sinusoid. These quency operating modes are described in the functional truth table. Tone Gener- Control logic is included to allow easy interface to standard K500-type telephones. Two CMOS outputs (TX, RX) capable ator) of driving external pnp receiver and transmitter muting /Autho transistors are provided. A low input to the CD pin inhibits r () tone generation, turns off the reference oscillator and causes TX and RX outputs to go to logic `0'. During tone generation /Keymode, CD = 1 and TX, RX = logic 1. words (HarThe row, column and CD inputs are provided with pull-up resistors to allow the use of SPST switch matrixes. ris SemiOrdering Information conTEMP. PKG. ductor, PART NUMBER RANGE (oC) PACKAGE NO. TeleCD22859E -40 to 85 16 Ld PDIP E16.3 com, SLICs, SLACs , Telephone, Telephony, WLL, Wireless
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
VDD 1 TX 2 C1 3 C2 4 C3 5 VSS 6 OSC1 7 OSC2 8
16 VOUT 15 CD 14 R1 13 R2 12 R3 11 R4 10 RX 9 C4
4-126
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-800-4-HARRIS or 407-727-9207 | Copyright (c) Harris Corporation 1999
CD22859
Absolute Maximum Ratings
Supply Voltage (VDD - VSS). . . . . . . . . . . . . . . . . . . . . . . -0.5 to 12V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VDD 0.5V Power Dissipation, PD TA = -40oC to 60oC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500mW TA = 60oC to 85oC . . . . . Derate Linearly at 1.2mW/oC to 200mW
Thermal Information
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .175oC Maximum Junction Temperature (Plastic) . . . . . . . . . . . . . . . .150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC
Operating Conditions
Power Dissipation Per Output . . . . . . . . . . . . . . . . . . . . . . . .100mW Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
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
TA = -25oC to 60oC, All Voltages Referenced to VSS = 0V VDD (V) MIN MAX UNITS
PARAMETER DYNAMIC DC SUPPLY VOLTAGE Tone Generation Mode with Valid Input (Note 1) Non-Tone Generation (Note 2) DYNAMIC OPERATING CURRENT Tone Generation Mode (Outputs Unloaded)
2.5 1.7
10 10
V V
3.7 9.3
-
2.7 13 100 200 400 0.2VDD 0.8VDD
mA mA A A A V V
No Keydown Mode
3.7 9.3
Input Pull-Up Current Input Low Voltage (VIL) Maximum Input Low Voltage (VIH) Minimum
3 - 10 3 - 10 3 - 10
Electrical Specifications
TA = -25oC to 60oC VDD (V) VO (V) MIN MAX UNITS
PARAMETER STATIC TONE OUTPUTS (RL = 82) VO; Dual-Tone Output VO (CL); Single-Tone Output, Column (Note 3) VO (RL); Single-Tone Output, Row (Note 4) Distortion (Note 5) Rise and Fall Time (Dual-Tone Out) (Note 6) Pre-Emphasis (Note 7) Output Frequency (Note 8)
3.7 - 9.3 3.7 - 9.3 3.7 - 9.3 3.9 - 9.3 3.9 - 9.3 3.9 - 9.3 3.9 - 9.3
-
350 300 260 1 (Nom. -1%)
700 10 5 3 (Nom. +1%)
mVRMS mVRMS mVRMS % ms dB Hz
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CD22859
Electrical Specifications
TA = -25oC to 60oC (Continued) VDD (V) VO (V) MIN MAX UNITS
PARAMETER STATIC MUTE OUTPUT CURRENT Transmitter IOH (Source) IOL (Sink) Receiver IOH (Source) IOL (Sink) 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.
1.7 10 10 1.7 10 10
1.2 9.5 2.5 1.2 9.5 2.5
-0.5 -3.4 -0.5 -3.4 -
10 10
mA mA A mA mA A
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 dualtone signal, measure across RL. ( V 1 2 + V 2 2 + ... + V n 2 ) Distortion= ------------------------------------------------------------------ , VL 2 + VH 2 where V1, V2 . . . . Vn are extraneous frequency components in the voiceband 0.5kHz to 3kHz, VL is the low-band frequency tone, and VH 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.
4-128
CD22859
COL 1
COL 2
COL 3
COL 4
ROW 1
1
2
3
A
697 (699.1)
ROW 2
4
5
6
B
770 (766.2)
ROW 3
7
8
9
C
852 (847.4)
ROW 4
*
0
#
D
941 (948.0) NOMINAL OUTPUT FREQUENCY
1209 1336 1477 1633 (1215.9) (1331.7) (1471.9) (1645.0)
FIGURE 1. BELL AND NOMINAL OUTPUT FREQUENCIES (IN PARENTHESIS) FOR 3.579545MHz CRYSTAL
DTMF GENERATOR FUNCTIONAL TRUTH TABLE INPUTS NUMBER OF COLUMN INPUTS ACTIVATED "LOW" X 0 0 1, 2, 3, or 4 Normal Dialing One Key Depressed (Note 9) Two or More Keys In Same Row (Note 10) Two or More Keys In Same Column Two or More Keys In Different Rows and Columns 1 NUMBER OF ROW INPUTS ACTIVATED "LOW" X 0 1 0 1 OUTPUTS
KEYBOARD MODE X No Key Depressed
CD "0" "1" "1" "1" "1"
TONE None None Dual Tone RA, C1 None Dual Tone RA, CB
OSC RUNNING No No Yes No Yes
RX "0" "0" "1" "0" "1"
TX "0" "0" "1" "0" "1"
2, 3, or 4
1
"1"
Single Row Tone RA
Yes
"1"
"1"
1
2, 3, or 4
"1"
Single Column Tone CB None
Yes
"1"
"1"
2, 3, or 4
2, 3, or 4
"1"
Yes
"1"
"1"
Where: X = Don't Care RA refers to Tone Output frequencies corresponding to Row 1, Row 2, Row 3, Row 4; CB 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
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CD22859 Functional Diagram
VDD
COUNT CONT. C1 3
COL. DIVIDER C1-46 C3-38 C2-42 C4-34 D
/ 32
A
C2
4 COL SENSE COL INH
C3
5
C4
9
ROW DIVIDER R1-80 R3-66 R2-73 R4-59 D COUNT CONT.
/ 32
A
CD
15
VDD
ROW INH R1 14 VDD 1 R2 13 ROW SENSE ENABLE OP AMP 16 VOUT R4 11 RX 10 OSC 1 7 OSC OSC 2 8 MUTE CONTROL TX 2 VSS 6
R3
12
/2
d L1 1K
a
G
D1 D2
I
51K
IT VDD g RX + KEYPAD 1 123 OSC1 8 456 789 0#
1.65K
TX F RR B
RX GN GN L4 R2
f
/CD
TX
2.55K
OSC2 VOUT R4 RL VSS
*
A C1
C2
R1 V2 V1 L1 L2 NETWORK C R3 C3
K D3
L2
b
a c
D4
FIGURE 2. INTERFACE WITH STANDARD K500 TELEPHONE NETWORK
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