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CS61575 Datasheet(PDF) 12 Page - Cirrus Logic |
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CS61575 Datasheet(HTML) 12 Page - Cirrus Logic |
12 / 44 page The E1 G.703 pulse shape is supported with line length selection LEN2/1/0=0/0/0. The pulse width will meet the G.703 pulse shape template shown in Figure 9, and specified in Table 4. The CS61574A and CS61575 will detect a static TCLK, and will force TTIP and TRING low to prevent transmission when data is not present. When any transmit control pin (TAOS, LEN0-2 or LLOOP) is toggled, the transmitter outputs will require approximately 22 bit periods to stabi- lize. The transmitter will take longer to stabilize when RLOOP is selected because the timing cir- cuitry must adjust to the new frequency. Transmit All Ones Select The transmitter provides for all ones insertion at the frequency of TCLK. Transmit all ones is se- lected when TAOS goes high, and causes continuous ones to be transmitted on the line (TTIP and TRING). In this mode, the TPOS and TNEG (or TDATA) inputs are ignored. If Remote Loopback is in effect, any TAOS request will be ignored. Receiver The receiver extracts data and clock from an AMI (Alternate Mark Inversion) coded signal and out- puts clock and synchronized data. The receiver is sensitive to signals over the entire range of ABAM cable lengths and requires no equalization or ALBO (Automatic Line Build Out) circuits. The signal is received on both ends of a center- tapped, center-grounded transformer. The transformer is center tapped on the IC side. The clock and data recovery circuit exceeds the jitter tolerance specifications of Publications 43802, 43801, AT&T 62411, TR-TSY-000170, and CCITT REC. G.823. 269 ns 244 ns 194 ns 219 ns 488 ns Nominal Pulse 0 10 50 80 90 100 110 120 -10 -20 Percent of nominal peak voltage Figure 9. Mask of the Pulse at the 2048 kbps Interface For c oax ia l c abl e, 75 Ω l oad and transformer specified in Application Section. For shielded twisted pair, 120 Ω load and transformer specified in Application Section. Nominal peak voltage of a mark (pulse) 2.37 V 3 V Peak voltage of a space (no pulse) 0 ±0.237 V 0 ±0.30 V Nominal pulse width 244 ns Ratio of the amplitudes of positive and negative pulses at the center of the pulse interval 0.95 to 1.05* Ratio of the widths of positive and negative pulses at the nominal half amplitude 0.95 to 1.05* * When configured with a 0.47 µF nonpolarized capacitor in series with the TX transformer primary as shown in Figures A1, A2 and A3. Table 4. CCITT G.703 Specifications CS61574A CS61575 12 DS154F2 |
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Similar Description - CS61575 |
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