PDF 75T202 Data sheet ( Hoja de datos )

Número de pieza	75T202
Descripción	(75T202 / 75T203) 5V Low Power DTMF Receiver
Fabricantes	TDK
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No Preview Available ! taSheet4U.com D5TVML7F5oTRw2e-0Pc2eo/iw2v0ee3rrDESCRIPTION aThe 75T202 and 75T203 are complete Dual-tone .DMultifrequency (DTMF) receivers detecting a wselectable group of 12 or 16 standard digits. No wfront-end pre-filtering is needed. The only externally wrequired components are an inexpensive 3.58 MHz television “colorburs” crystal (for frequency mreference) and a bias resistor. Extremely high osystem density is made possible by using the clock output of a crystal-connected 75T202 or 75T203 .creceiver to drive the time bases of additional receivers. Both are monolithic integrated circuits fabricated with low-power, complementary symmetry UMOS (CMOS) processing. They require only a single low tolerance voltage supply and are packaged in a t4standard 18-pin plastic DIP. (continued) FEATURES February 1998 • Central office quality • NO front-end band-splitting filters required • Single, low-tolerance, 5-volt supply • Detects either 12 or 16 standard DTMF digits • Uses inexpensive 3.579545 MHz crystal for reference • Excellent speech immunity • Output in either 4-bit hexadecimal code or binary coded 2-of-8 • 18-pin DIP package for high system density • Synchronous or handshake interface • Three-state outputs • Early detect output (75T203 only) eeBLOCK DIAGRAM taShANALOG PRE-PROCESSOR 60 Hz REJECT PREEMP w.DaATB XEN wXIN w m1Mz U.coXOUT ÷8 BAND SPLIT FILTERS BS1 ZERO CROSSING DETECTORS BS2 CLOCK GENERATOR BANDPASS FILTERS 697 770 852 941 1209 1336 1477 1633 CHIP CLOCKS AMPLITUDE DETECTORS TIMING CIRCUITRY DV DATA STROBE CLR DV F.F. OUTPUT DECODER OUTPUT REGISTER eet4POWER REGULATOR www.DataShVP GND GND VOLTAGE REF DATA CLEAR IN1633 ED 75T203 CLRDV DV HEX/B28 D1 D2 D4 D8 EN 1 page 75T202/203 5V Low-Power DTMF Receiver ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS (Operation above absolute maximum ratings may damage the device. All 75T202/203 unused inputs must be connected to VP or GND, as appropriate.) PARAMETER DC Supply Voltage - VP Operating Temperature Storage Temperature Power Dissipation (25°C) Input Voltage (All inputs except ANALOG IN) ANALOG IN Voltage DC Current into any Input Lead Temperature - Soldering, 10 sec. RATING +7V -40°C to +85°C Ambient -65°C to +150°C 65mW (VP + .5V) to -.5V (VP + .5V) to (VP - 10V) ±1.0mA 300°C ELECTRICAL CHARACTERISTICS (-40°C ² TA ² +85°C, VP = 5V ± 10%) PARAMETER Frequency Detect Bandwidth Amplitude for Detection CONDITIONS each tone Twist Tolerance Twist = High Tone Low Tone 60-Hz Tolerance Dial Tone Tolerance “precise” dial tone Talk Off MITEL tape #CM 7290 Digital Outputs “0” level, 400µA load (except XOUT) “1” level, 200µA load Digital Inputs “0” level “1” level Power Supply Noise wide band Supply Current TA = 25°C Noise Tolerance MITEL tape #CM 7290 Input Impedance VP³VIN³VP-10 * dB referenced to lowest amplitude tone MIN ±(1.5+2Hz) -32 -10 TYP ±2.3 0 VP-0.5 0 0.7VP 2 10 100kΩ\|\|15pF MAX ±3.5 -2 +10 UNITS % of fO dBm ref. to 600Ω dB 0.8 0dB 0.5 VP 0.3VP VP 10 16 -12 Vrms dB* hits V V V V mV p-p mA dB* 5 5 Page

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