75T2090 TDK | Alldatasheet

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Technical content

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 600W )
  • 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 INTERNAL CLOCK ATBXEN RS XOUTXIN LIN (2090/2091 only) LATCH RESET DIN Vp Vn DE DV ED (2091 only) DTMF OUT DET (2090/2091 only) POWER REGULATOR VOLTAGE REF BS1 BS2 697 770 852 941 1209 1336 1477 1633 BANDPASS FILTERS AMPLITUDE DETECTORS BANDPASS FILTERS Vp Vp Vp D Q D Q D Q D QCK CK D Q CLR DTMF GENERATOR BANDSPLIT FILTERS Vp ENERGY DETECTOR Vp TIMING CIRCUITRY DV STROBE DV F.F. OUTPUT DECODER AND REGISTER

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. 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. FIGURE 5: DTMF Output ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Operating above absolute maximum ratings may damage the device. PARAMETER RATING DC Supply Voltage ( Vp - Vn) +7V Voltage at any Pin ( Vn = 0) -0.3 to Vp + 0.3V DIN Voltage Vp + 0.5 to Vp - 10V Current through any Protection Device =20mA Operating Temperature Range -40 to + 85°C Storage Temperature -65 to 150°C RECOMMENDED OPERATING CONDITIONS PARAMETER CONDITIONS MIN NOM MAX UNIT Supply Voltage 4.5 5.5 V Power Supply Noise (wide band) 10 mVp-p Ambient Temperature -40 +85 °C Crystal Frequency -0.01 +0.01 % (F Nominal = 3.579545MHz) Crystal Shunt Resistor 0.8 1.2 MΩ DTMF OUT Load Resistance 100 Ω DTMF OUT 1:1 TIP 100Ω RING

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 CONDITIONS MIN NOM MAX UNIT Supply Current* 15 30 mA Power Dissipation 225 mW Input Voltage High 0.7Vp V Input Voltage Low 0.3Vp V Input Current High 10 µA Input Current Low -10 µA Output Voltage High Ioh = -0.2mA Vp-0.5 V Output Voltage Low IoI = +0.4mA Vn+0.5 V * with DTMF output disabled DTMF RECEIVER : Electrical Characteristics PARAMETER CONDITIONS MIN NOM MAX UNIT Frequency Detect Bandwidth =(1.5+2Hz) =2.3 =3.5 %Fo Amplitude for Detection Each Tone -32 -2 dBm/tone Twist Tolerance -10 +10 dB 60Hz Tolerance 0.8 Vrms Dial Tone Tolerance Precise Dial Tone 0 dB* Speech Immunity MITEL Tape #CM7290 2 hits Noise Tolerance MITEL Tape #CM7290 -12 dB* Input Impedance 100 kΩ * Referenced to lowest amplitude tone DTMF RECEIVER : Timing Characteristics PARAMETER CONDITIONS MIN NOM MAX UNIT TON Tone Time for Detect 40 ms TON Tone Time for No Detect 20 ms TOFF Pause Time for Redetection 40 ms TOFF Pause Time for Bridging 20 ms TD1 Detect Time 25 46 ms TR1 Release Time 35 50 ms

DTMF RECEIVER : Timing Characteristics (Continued) PARAMETER CONDITIONS MIN NOM MAX UNIT TSU1 Data Set Up Time 7 µs THD1 Data Hold Time 4.2 5.0 ms TED ED Detect Time 75T2091 only 7 22 ms BER ED Release Time 75T2091 only 2 18 ms Output Enable Time 200 ns Output Disable Time 200 ns DTMF GENERATOR : Electrical Characteristics Frequency Accuracy -1.0 +1.0 %Fo Output Amplitude R1 = 100Ω to Vn, Vp - Vn = 5.0V Low Band -9.2 -7.2 dBm High Band -6.6 -4.6 dBm Output Distortion DC to 50 kHz -20 dB DTMF GENERATOR : Timing Characteristics TSTART Start-Up Time 2.5 µs TSU2 Data Set-Up Time 100 ns THD2 Data Hold Time 50 ns TRP RESET Pulse Width 100 ns TPW LATCH Pulse Width 100 ns CALL PROGRESS DETECTOR : Electrical Characteristics (75T2090/2091 only) Amplitude for Detection 305 Hz-640 Hz -40 0 dBm

305 Hz-640 Hz -50 dBmAmplitude for No Detection

f>2200 Hz, <160 Hz -25 dBm Logic 0 0.5 VDetect Output Logic 1 4.5 V "LIN" Input Max. Voltage VDD-10 VDD V Input Impedance 500 Hz 100 kΩ

(Top View) 75T2089/2090 75T2091 22-Pin DIP 28-Pin PLCC

ORDERING INFORMATION

PART DESCRIPTION ORDER NUMBER PACKAGING MARK 75t2089 22-Pin Plastic DIP 75T2089-IP 75T2089-IP 75T2090 22-Pin DIP 75T2090-IP 75T2090-IP 75T2091 28-Pin PLCC 75T2091-IH 75T2091-IH 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  1991 - 2000 TDK Semiconductor Corporation 04/24/00- rev. E DV LATCH RST DET* LIN* DTMFOUT VN DE VP XEN DIN XOUT XIN ATB * 75T2090 only 4 3 2 1 28 27 26 12 13 14 15 16 17 18 DV DIN XOUT XIN ATB VN DTMFOUT LIN DE VP ED N/C N/C XEN N/C LATCH N/C N/C RST DET CAUTION: Use handling procedures necessary for a static sensitive component.