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CS61305A 数据表(PDF) 11 Page - Cirrus Logic |
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CS61305A 数据表(HTML) 11 Page - Cirrus Logic |
11 / 44 page Transmit All Ones Select The transmitter provides for all ones insertion at the frequency of ACLKI. 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. A TAOS request will be ignored if remote loopback is in effect. ACLKI jitter will be attenuated. TAOS is not available on the CS61305A when ACLKI is grounded. Jitter Attenuator The jitter attenuator is designed to reduce wander and jitter in the transmit clock signal. It consists of a 192 bit FIFO, a crystal oscillator, a set of load capacitors for the crystal, and control logic. The jitter attenuator exceeds the jitter attenuation requirements of Publications 43802 and REC. G.742. A typical jitter attenuation curve is shown in Figure 10. The jitter attenuator works in the following man- ner. Data on TPOS and TNEG (or TDATA) are 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 Fo r c o ax i a l c a bl e, 75 Ω load an d 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 Frequency in Hz 0 10 20 30 40 50 60 1 10 100 1 k 10 k b) Maximum Attenuation Limit AT&T 62411 Requirements a) Minimum Attenuation Limit Measured Performance Figure 10. Typical Jitter Attenuation Curve CS61305A DS157PP3 11 |
类似零件编号 - CS61305A |
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类似说明 - CS61305A |
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