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ADLD8403 Datasheet(PDF) 9 Page - Analog Devices |
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ADLD8403 Datasheet(HTML) 9 Page - Analog Devices |
9 / 10 page Data Sheet ADLD8403 MULTITONE POWER RATIO (MTPR) The DMT signal used in ADSL/ADSL2+ systems carries data in discrete tones or bins, which appear in the frequency domain in evenly spaced 4.3125 kHz intervals. In applications using this type of waveform, the MTPR is commonly used to measure ac linearity. In general, designers are concerned with two types of MTPR: in-band and out-of-band. In-band MTPR is the measured difference from the peak of one tone that is loaded with data to the peak of an adjacent empty tone. Out-of-band MTPR is the spurious emissions that occur in bands just below and above the transmit band. For ADSL2+ applications, the out-of-band MTPR is the receive band between 25.875 kHz and 138 kHz and the region above 2.208 MHz. Figure 13 shows the out-of-band MTPR for the ADLD8403. 0 –80 –70 –60 –50 –40 –30 –20 –10 0 0.5 1.0 1.5 2.0 2.5 3.0 FREQUENCY (MHz) Figure 13. Out-of-Band MTPR LIGHTNING AND AC POWER FAULT As an ADSL/ADSL2+ line driver, the ADLD8403 is transformer coupled to the twisted pair telephone line. In this environment, the ADLD8403 is subject to large line transients resulting from events such as lightning strikes or downed power lines. Additional circuitry is required to protect the ADLD8403 from damage due to these events. Rev. C | Page 9 of 10 |
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