PDF 75T2091-IH Data sheet ( Hoja de datos )

Número de pieza	75T2091-IH
Descripción	DTMF Transceivers
Fabricantes	ETC
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No Preview Available ! 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) 75T2089/2090/2091 DTMF Transceivers FEATURES April 2000 • 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 600Ω ) • 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 LIN (2090/2091 only) D7 D6 D5 D4 Vp LATCH Vp RESET DIN XIN DQ DQ DQ DQ CK RS X1 XOUT XEN ATB Vp 8 BANDSPLIT FILTERS INTERNAL CLOCK ENERGY DETECTOR Vp DTMF GENERATOR CK Q Vp D CLR BANDPASS FILTERS BANDPASS FILTERS 697 BS1 770 852 AMPLITUDE DETECTORS TIMING CIRCUITRY 941 1209 BS2 1336 DV STROBE DV F.F. 1477 1633 POWER REGULATOR VOLTAGE REF OUTPUT DECODER AND REGISTER Vp Vn DE DET (2090/2091 only) DTMF OUT ED (2091 only) DV D3 D2 D1 D0 1 page 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 CONDITIONS Ioh = -0.2mA IoI = +0.4mA MIN 0.7Vp -10 Vp-0.5 NOM 15 MAX 30 225 0.3Vp 10 Vn+0.5 UNIT mA mW V V µA µA V V DTMF RECEIVER: Electrical Characteristics PARAMETER CONDITIONS Frequency Detect Bandwidth Amplitude for Detection Each Tone Twist Tolerance 60Hz Tolerance Dial Tone Tolerance Precise Dial Tone Speech Immunity MITEL Tape #CM7290 Noise Tolerance MITEL Tape #CM7290 Input Impedance * Referenced to lowest amplitude tone MIN =(1.5+2Hz) -32 -10 NOM =2.3 2 100 MAX =3.5 -2 +10 0.8 0 -12 UNIT %Fo dBm/tone dB Vrms dB* hits dB* kΩ DTMF RECEIVER: Timing Characteristics PARAMETER TON Tone Time for Detect TON Tone Time for No Detect TOFF Pause Time for Redetection TOFF Pause Time for Bridging TD1 Detect Time TR1 Release Time CONDITIONS MIN NOM MAX 40 20 40 20 25 46 35 50 UNIT ms ms ms ms ms ms 5 5 Page

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