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75T2089/2090/2091 DTMF Transceivers
April 2000
DESCRIPTION
TDK Semiconductor's 75T2089/2090/2091 are complete Dual-Tone Multifrequency (DTMF) Transceivers that can both generate and detect all 16 DTMF tone-pairs. These ICs integrate the performance-proven 75T202 DTMF receiver with a DTMF generator circuit. The DTMF receiver electrical characteristics are identical to the standard 75T202 device characteristics. The DTMF generator provides performance similar to the Mostek MK5380, but with an improved (tighter) output amplitude range specification and with the addition of independent latch and reset controls. An additional feature of the 75T2090/2091 is "imprecise" call progress detector. The detector detects the presence of signals in the 305-640 Hz band.
(continued)
FEATURES
* * * * * * * * * * * * DTMF Generator and Receiver on one-chip Call progress detection (2090/2091 only) Early detect output (2091 only) DTMF Receiver exhibits excellent speech immunity Analog input range from -32 to -2 dBm (ref 600 ) Three-state outputs (4-bit hexadecimal) from DTMF Receiver AC coupled, internally biased analog input Latched DTMF Generator inputs DTMF output typ. -8 dBm (Low Band) and -5.5 dBm (High Band) Easy interface for microprocessor dialing Uses inexpensive 3.579545 MHz crystal for reference Low-power 5 volt CMOS
BLOCK DIAGRAM
XIN
RS X 1 XOUT
XEN ATB
Vp 8 BANDSPLIT FILTERS INTERNAL CLOCK ENERGY DETECTOR Vp D7 D6 D5 D4 Vp LATCH Vp RESET Vp CK Q DTMF OUT D D D D CK Q Q Q Q DTMF GENERATOR DET (2090/2091 only)
LIN (2090/2091 only)
D CLR BANDPASS FILTERS
BANDPASS FILTERS DIN BS1
697
AMPLITUDE DETECTORS TIMING CIRCUITRY ED (2091 only)
770
852
941
1209
DV STROBE
DV F.F.
DV
BS2
1336 D3 D2 D1 D0
1477 OUTPUT DECODER AND REGISTER VOLTAGE REF
1633
POWER REGULATOR
Vp
Vn
DE
75T2089/2090/2091 DTMF Transceivers
DESCRIPTION (continued)
The 75T2091 also incorporates an early detect function which is useful in multi-channel radio scanning applications. The only external components necessary for the 75T2089/2090/2091 are a 3.58 MHz "colorburst" crystal with a parallel 1 M resistor. This provides the time base for digital functions and switched-capacitor filters in the device. No external filtering is required. The IC is designed to accept sinusoidal input waveforms but will operate satisfactorily with any input that has the correct fundamental frequency with harmonics greater than -20 dB below the fundamental. CRYSTAL OSCILLATOR The IC contains an onboard inverter with sufficient gain to provide oscillation when connected to a lowcost television " olorburst" crystal. The crystal is c placed between XIN and XOUT in parallel with a 1Mz resistor, while XEN is tied high. Since the switched-capacitor-filter time base is derived from the crystal oscillator, the frequency accuracy of all portions of the IC depends on the time base tolerance. The DTMF Receiver frequency response and timing is specified for a time base accuracy of at least =0.005%. ATB is a clock output with the frequency of 1/8 of crystal. Other devices may use the same frequency reference by tying their ATB pins to the ATB of a crystal connected device. XIN and XEN of the auxiliary devices must then be tied high and low respectively, XOUT is left floating. XOUT is designed to drive a resonant circuit only and is not intended to drive additional devices. Ten devices may run off a single crystal-connected transceiver as shown in Figure 2.
CIRCUIT OPERATION
RECEIVER The DTMF Receiver in the 75T2089/2090/2091 detects the presence of a valid tone pair (indicating a single dialed digit) on a telephone line or other transmission medium. The analog input is pre-processed by 60 Hz reject and band-splitting filters, then hard-limited to provide Automatic Gain Control. Eight bandpass filters detect the individual tones. The digital post-processor times the tone durations and provides the correctly coded digital outputs. The outputs will drive standard CMOS circuitry, and are three-state enabled to facilitate bus-oriented architectures. DIN This pin accepts the analog input. It is internally biased so that the input signal may be AC coupled. The input may be DC coupled as long as it does not exceed the positive supply. Proper input coupling is illustrated in Figure 1.
Vp Vp
VP XIN XOUT XEN
VINVIN>VP
ATB
75T20XX
(On Chip)
0.01 F 8 10 pF DIN
(On Chip)
8 DIN
XIN Connected to VP
10 pF
>100 k
>100 k
ATB
75T20XX
XEN
GND
GND
Up to 10 Devices
FIGURE 1: Input Coupling
FIGURE 2: Crystal Connections
2
75T2089/2090/2091 DTMF Transceivers
RECEIVER OUTPUTS AND THE DE PIN Outputs D0, D1, D2, D3 are CMOS push-pull when enabled (DE low) and open-circuited (high impedance) when disabled ( DE high). These digital outputs provide the hexadecimal code corresponding to the detected digit. Figure 3 shows that code. The digital outputs become valid and DV signals a detection after a valid tone pair has been sensed. The outputs and DV are cleared when a valid pause has been timed. Hexadecimal Code Digit In Out 1 2 3 4 5 6 7 8 9 0 * # A B C D D7 D3 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 D6 D2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 FIGURE 3 D5 D1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 D4 D0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
Row 3 * 0 # D NOTE: Column 3 is for special applications and is not normally used in telephone dialing. Row 2 7 8 9 C Row 1 4 5 6 B Row 0
ED OUTPUT (75T2091 only) The ED output goes high as soon as the 75T2091 begins to detect a DTMF tone pair and falls when the 75T2091 begins to detect a pause. The D1, D2, D4, and D8 outputs are guaranteed to be valid when DV is high, but are not necessarily valid when ED is high. GENERATOR The DTMF generator responds to a hexadecimal code input with a valid tone pair. Pins D4-D7 are the data inputs for the generator. A high to low transition on LATCH causes the hexadecimal code to be latched internally and generation of the appropriate DTMF tone pair to begin. The DTMF output is disabled by a high on RESET and will not resume until new data is latched in. DIGITAL INPUTS The D4, D5, D6, D7, LATCH, RESET inputs to the DTMF generator may be interfaced to open-collector TTL with a pull-up resistor or standard CMOS. These inputs follow the same hexadecimal code format as the DTMF receiver output. Figure 4 shows the code for each digit. The dialing matrix and detection frequency table below list the frequencies of the digits.
Col 0 1 Col 1 2 Col 2 3 Col 3 A
FIGURE 4: DTMF Dialing Matrix DETECTION FREQUENCY Low Group f0 Row Row Row Row 0 1 2 3 = = = = 697Hz 770Hz 852Hz 941Hz High Group f0 Column Column Column Column 0 1 2 3 = = = = 1209Hz 1336Hz 1477Hz 1633Hz
3
75T2089/2090/2091 DTMF Transceivers
DTMF OUT The output amplitude characteristics listed in the specifications are given for a supply voltage of 5.0V. However, the output level is directly proportional to the supply, so variations in it will affect the DTMF output. A recommended line interface for this output is shown in Figure 5. CALL PROGRESS DETECTION (75T2090/2091) The 75T2090/2091 have a Call Progress Detector that consists of a bandpass filter and an energy detector for turning the on/off cadences into a microprocessor compatible signal. DET OUTPUT (75T2090/2091) The output is TTL compatible and will be of a frequency corresponding to the various candences of Call Progress signals such as: on 0.5 sec/off 0.5 sec for a busy tone, on 0.25 sec/off 0.25 sec for a reorder tone and on 0.8-1.2 sec/off 2.7-3.3 sec for an audible ring tone. FIGURE 5: DTMF Output LIN INPUT (75T2090/2091) This analog input accepts the call progress signal and should be used in the same manner as the receiver input DIN.
DTMF OUT
1:1
TIP
RING 100
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS Operating above absolute maximum ratings may damage the device. PARAMETER DC Supply Voltage (Vp - Vn) Voltage at any Pin (Vn = 0) DIN Voltage Current through any Protection Device Operating Temperature Range Storage Temperature RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage Power Supply Noise (wide band) Ambient Temperature Crystal Frequency (F Nominal = 3.579545MHz) Crystal Shunt Resistor DTMF OUT Load Resistance 0.8 100 1.2 M -40 -0.01 CONDITIONS MIN 4.5 NOM MAX 5.5 10 +85 +0.01 UNIT V mVp-p C % RATING +7V -0.3 to Vp + 0.3V Vp + 0.5 to Vp - 10V =20mA -40 to + 85C -65 to 150C
4
75T2089/2090/2091 DTMF Transceivers
DIGITAL AND DC REQUIREMENTS The following electrical specifications apply to the digital input and output signals over the recommended operating range unless otherwise noted. The specifications do not apply to the following pins: LIN, DIN, XIN, XOUT, and DTMF OUT. Positive current is defined as entering the circuit. Vn = 0 unless otherwise stated. PARAMETER Supply Current* Power Dissipation Input Voltage High Input Voltage Low Input Current High Input Current Low Output Voltage High Output Voltage Low * with DTMF output disabled DTMF RECEIVER: Electrical Characteristics PARAMETER Frequency Detect Bandwidth Amplitude for Detection Twist Tolerance 60Hz Tolerance Dial Tone Tolerance Speech Immunity Noise Tolerance Input Impedance * Referenced to lowest amplitude tone DTMF RECEIVER: Timing Characteristics PARAMETER TON TON TOFF TOFF TD1 TR1 Tone Time for Detect Tone Time for No Detect Pause Time for Redetection Pause Time for Bridging Detect Time Release Time 25 35 40 20 46 50 CONDITIONS MIN 40 20 NOM MAX UNIT ms ms ms ms ms ms Precise Dial Tone MITEL Tape #CM7290 MITEL Tape #CM7290 100 2 -12 Each Tone CONDITIONS MIN
=(1.5+2Hz)
CONDITIONS
MIN
NOM 15
MAX 30 225
UNIT mA mW V V A A V
0.7Vp 0.3Vp 10 -10 Ioh = -0.2mA IoI = +0.4mA Vp-0.5 Vn+0.5
V
NOM =2.3
MAX =3.5 -2 +10 0.8 0
UNIT %Fo
dBm/tone
-32 -10
dB Vrms dB* hits dB* k
5
75T2089/2090/2091 DTMF Transceivers
DTMF RECEIVER: Timing Characteristics (Continued) PARAMETER TSU1 THD1 TED BER Data Set Up Time Data Hold Time ED Detect Time ED Release Time Output Enable Time Output Disable Time DTMF GENERATOR: Electrical Characteristics Frequency Accuracy Output Amplitude Low Band High Band Output Distortion DC to 50 kHz
R1 = 100 to Vn, Vp - Vn = 5.0V
CONDITIONS
MIN 7 4.2
NOM
MAX 5.0 22 18 200 200
UNIT s ms ms ms ns ns
75T2091 only 75T2091 only
7 2
-1.0 -9.2 -6.6
+1.0 -7.2 -4.6 -20
%Fo dBm dBm dB
DTMF GENERATOR: Timing Characteristics TSTART TSU2 THD2 TRP TPW Start-Up Time Data Set-Up Time Data Hold Time RESET Pulse Width LATCH Pulse Width 100 50 100 100 2.5 s ns ns ns ns
CALL PROGRESS DETECTOR: Electrical Characteristics (75T2090/2091 only) Amplitude for Detection Amplitude for No Detection Detect Output "LIN" Input Input Impedance 305 Hz-640 Hz 305 Hz-640 Hz f>2200 Hz, <160 Hz Logic 0 Logic 1 Max. Voltage 500 Hz 4.5 VDD-10 100 VDD -40 0 -50 -25 0.5 dBm dBm dBm V V V k
6
75T2089/2090/2091 DTMF Transceivers
CALL PROGRESS DETECTOR: Electrical Characteristics (Continued) PARAMETER TON TON TOFF TOFF TD2 TR2 Signal Time for Detect Signal Time for No Detect Interval Time for Detect
Interval Time for No Detect
CONDITIONS
MIN 40
NOM
MAX 10
UNIT ms ms ms ms ms ms
40 20 40 40
Detect Time Release Time
TON
TOFF
TON TOFF
tone burst 1 DIN TD1 TR1
tone burst 2
tone burst 1 DIN TD1 TR1
tone burst 2
DV TSU1 THD1
DV TSU1 THD1
D0, D1, D2, D3 TED TER
D0, D1, D2, D3
ED
* *75T2091 only
FIGURE 6: DTMF Decoder FIGURE 7: Call Progress Detector (75T2090/2091 only)
THD2
D4, D5, D6, D7 TSU2 TPW
LATCH TPW (SEE NOTE)
RESET TSTART TRP
DTMF OUT
NOTE: THE INDICATED TIME MAY BE AS SMALL AS 0 SEC., MEANING THAT THE LATCH AND RESET LINES MAY BE TIED TOGETHER.
FIGURE 8: DTMF Generator
7
75T2089/2090/2091 DTMF Transceivers
MECHANICAL SPECIFICATIONS
22-Pin DIP
28-Pin PLCC
8
75T2089/2090/2091 DTMF Transceivers
PACKAGE PIN DESIGNATIONS
(Top View)
CAUTION: Use handling procedures necessary for a static sensitive component.
DV
D0
D1
D2
D3
D7
D3 D2 D1 D0 DE VP XEN DIN XOUT XIN ATB
1 2 3 4 5 6 7 8 9 10 11
22 21 20 19 18 17 16 15 14 13 12
DV D7 D6 D5 D4 LATCH RST DET* LIN*
DE VP ED N/C N/C XEN N/C 5 6 7 8 9 10 11
4
3
2
1
28 27 26 25 24 23 22 21 20 19 D5 D4 LATCH N/C N/C RST DET
12 13 14 15 16 17 18 DIN XIN VN
DTMFOUT VN
* 75T2090 only
75T2089/2090 22-Pin DIP
75T2091 28-Pin PLCC
ORDERING INFORMATION
PART DESCRIPTION 75t2089 22-Pin Plastic DIP 75T2090 22-Pin DIP 75T2091 28-Pin PLCC 75T2091-IH 75T2091-IH 75T2090-IP 75T2090-IP 75T2089-IP 75T2089-IP ORDER NUMBER PACKAGING MARK
No responsibility is assumed by TDK Semiconductor Corporation for use of this product nor for any infringements of patents and trademarks or other rights of third parties resulting from its use. No license is granted under any patents, patent rights or trademarks of TDK Semiconductor Corporation and the company reserves the right to make changes in specifications at any time without notice. Accordingly, the reader is cautioned to verify that the data sheet is current before placing orders. TDK Semiconductor Corporation, 2642 Michelle Drive, Tustin, CA 92780-7019, (714) 508-8800, FAX: (714) 508-8877 (c)1991 - 2000 TDK Semiconductor Corporation 04/24/00- rev. E
9
DTMFOUT
XOUT
ATB
LIN
D6

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