MX613 Datasheet | CML

Feature -Phone, Fax and Modem systems. Adhering to Must/Must-Not Decode limits and able to measure inband frequencies in outband modulation, this decoder measures the frequency of input signals in the range 300 to 2,150Hz. The result of each measurement is presented to a system µProcessor as a 6-bit serial word. The decode frequency range, which covers the world's call progress application spectrum, is processed internally as two bands: LO = 300 to 660Hz and HI = 900 to 2150Hz. Frequency measurement is achieved by counting the number of cycles in a set time period (LO = 39.47ms or HI = 13.16ms). Bad signal/level quality or NOTONE results in a count-abort, timing-reset and no output from the decoder. Front-end filtering is achieved using our patented Auto-Correlator. Current frequency information is output for the µProcessor using a Serial Data, Clock and Interrupt interface. Data from the MX613 should be processed by a µProcessor whose algorithms are able to recognize the frequency, sequence and/or cadence of input signals as national call progress information; e.g.: ‘Dial,’ ‘Busy,’ ‘Number-Unobtainable,’ ‘Ringing’ and automatic tones used by fax and modem systems. Software can be simply configured to reject speech frequencies. Available in SOIC and PDIP packages, this low-cost, mixed signal IC has a typical power requirement of less than 1m A at 3 volts and utilizes a tele-system clock input of 3.579545MHz to maintain frequency accuracy. © 1997 MX- Inc. .mx. Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054 Doc. # 20480086.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USAAll trademarks and service marks are held by their respective panies Global Call Progress Tone Detector MX613 Preliminary Information Pin Number Function MX613DW MX613P Xtal/Clock: The input to the on-chip clock oscillator inverter. A 3.579545MHz Xtal or externally derived telephone system clock (f XTAL) should be connected here. Operation of the MX613 without a...