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CS61583 数据表(PDF) 11 Page - Cirrus Logic |
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CS61583 数据表(HTML) 11 Page - Cirrus Logic |
11 / 44 page during the transmission of both marks and spaces. This improves signal quality by minimiz- ing reflections from the transmitter. Impedance matching also reduces load power consumption by a factor of two when compared to the return loss achieved by using external resistors. The CS61583 driver will automatically detect an inactive TLCK input (i.e., no valid data is being clocked to the driver). When this condition is de- tected, the driver is forced low (except during remote loopback) to output spaces and prevent TTIP and TRING from entering a constant trans- mit-mark state. When any transmit configuration established by CON[2:0], TAOS, or LLOOP changed states, the transmitter stabilizes within 22 TCLK bit peri- ods. The transmitter takes longer to stabilize when RLOOP1 or RLOOP2 is selected because the timing circuitry must adjust to the new fre- quency from RCLK. When the transmitter transformer secondaries are shorted through a 0.5 ohm resistor, the transmit- 500 1.0 0.5 0 -0.5 0 250 750 1000 NORMALIZED AMPLITUDE CS61583 OUTPUT PULSE SHAPE TIME (nanoseconds) ANSI T1.102 SPECIFICATION Figure 6. Typical Pulse Shape at DSX-1 Cross Connect 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 G.703 Specification Figure 7. Pulse Mask at the 2048 kbps Interface C O N 2 C O N 1 C O N 0 Transmit Pulse Width at 50% Amplitude Transmit Pulse Shape Receiver Slicing Level 0 0 0 0 0 1 244 ns (50%) 244 ns (50%) E1: square, 2.37 Volts into 75 Ω E1: square, 3.00 Volts into 120 Ω 50% 50% 0 1 0 350 ns (54%) DSX-1: 0-133 ft. / or DS1 FCC Part 68 Option A with undershoot 65% 0 1 1 350 ns (54%) DSX-1: 133-266 ft. 65% 1 0 0 350 ns (54%) DSX-1: 266-399 ft. 65% 1 0 1 350 ns (54%) DSX-1: 399-533 ft. 65% 1 1 0 350 ns (54%) DSX-1: 533-655 ft. 65% 1 1 1 324 ns (50%) DS1: FCC Part 68 Option A (0 dB) 65% Table 1. Configuration Selection CS61583 DS172PP5 11 |
类似零件编号 - CS61583 |
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类似说明 - CS61583 |
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