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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT83SL314 датащи(PDF) 21 Page - Exar Corporation |
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XRT83SL314 датащи(HTML) 21 Page - Exar Corporation |
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21 / 83 page  xr XRT83SL314 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT REV. 1.0.1 18 2.2 Equalizer Control The main objective of the equalizer is to amplify an input attenuated signal to a pre-determined amplitude that is acceptable to the peak detector circuit. Using feedback from the peak detector, the equalizer will gain the input up to the maximum value specified by the equalizer control bits, in the appropriate channel register, normalizing the signal. Once the signal has reached the pre-determined amplitude, the signal is then processed within the peak detector and slicer circuit. A simplified block diagram of the equalizer and peak detector is shown in Figure 6. FIGURE 6. SIMPLIFIED BLOCK DIAGRAM OF THE EQUALIZER AND PEAK DETECTOR 2.3 Cable Loss Indicator The ability to monitor the cable loss attenuation of the receiver inputs is a valuable feature. The XRT83SL314 contains a per channel, read only register for cable loss indication. CLOS[5:0] is a 6-Bit binary word that reports the value of cable loss in 1dB steps. An example of -15dB cable loss attenuation is shown in Figure 7. FIGURE 7. SIMPLIFIED BLOCK DIAGRAM OF THE CABLE LOSS INDICATOR Peak Detector & Slicer Rx Equalizer Rx Equalizer Control RTIP RRING -15dB of Cable Loss Equalizer and Peak Detector CLOS[5:0] = 0x0Fh (15dec = 0Fhex) -15dB Attenuated Signal Read Only XRT83SL314 |
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