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DMT Signal A DMT signal is basically the sum of N inde- pendently QAM modulated signals, each carried over a distinct carrier. The frequency separation of each carrier is 4.3125kHz with a total number of 256 carriers (ANSI). For N large, the signal can be modelled by a gaussian process with a certain amplitude probability density function. Since the maximum amplitude is expected to arise very rarely, we decide to clip the signal and to trade- off the resulting SNR loss against AD/DA dy- namic. A clipping factor (Vpeak/Vrms = crest fac- tor) of 5 will be used resulting in a maximum SNR of 75dB. ADSL DMT signals are nominally sent at -40dBm/Hz 3dB (-3.65dBm/carrier) with a maximal power of 100mW for down link transmitter and 15.7mW for uplink transmitter. DMT symbols are transmitted without window- ing causing sin (x)/x like sidelobes. For spectral response shaping, the 1st sidelobe level is as- sumed to be 13dB under the carrier level with an attenuation of -20dB/dec. The minimum SNR + D neede d for DMT carrier demodulation is about (3 ⋅ N + 20) dB with a minimum of 38dB were N is the constellation size of a carrier (in bits).
(tAVQV) is equal to the delay from E to output (tELQV). Data is available at the output after a delay of t GLQV from the falling edge of G, assuming that E has been low and the addresses have been sta- ble for at least tAVQV-tGLQV. Standby Mode The T0-44.7360MHZ has a standby mode which reduc- es the supply current from 15mA to 15µA with low voltage operation VCC 3.6V, see Read Mode DC Characteristics table for details. The T0-44.7360MHZ is placed in the standby mode by applying a CMOS high signal to the E input. When in the standby mode, the outputs are in a high impedance state, independent of the GVPP input.
The T0-44.7360MHZ/T0-44.7360MHZ/T0-44.7360MHZ are low-on-resis- tance, low-voltage, single-pole/single-throw (SPST) analog switches that operate from a +1.8V to +5.5V sin- gle supply. The T0-44.7360MHZ is normally open (NO), and the T0-44.7360MHZ is normally closed (NC). The T0-44.7360MHZ is normally open (NO) and has two control inputs. These devices also have fast switching speeds (tON = 50ns max, tOFF = 30ns max). When powered from a +5V supply, the T0-44.7360MHZ/ T0-44.7360MHZ/T0-44.7360MHZ offer 0.5Ω max on-resistance (RON) with 0.1Ω max RON flatness, and their digital logic inputs are TTL compatible. These switches also feature overcurrent protection to prevent device dam- age from short circuits and excessive loads. The T0-44.7360MHZ is pin compatible with the T0-44.7360MHZAX4514, and the T0-44.7360MHZ is pin compatible with the T0-44.7360MHZAX4515. The T0-44.7360MHZ/T0-44.7360MHZ are available in SOT23-5 pack- ages; the T0-44.7360MHZ is available in a SOT23-6 package.
Parr number/PDF Mfg Pack D/C Descrpion
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