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CS61318-IL 数据表(PDF) 10 Page - Cirrus Logic |
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CS61318-IL 数据表(HTML) 10 Page - Cirrus Logic |
10 / 28 page CS61318 10 DS441PP2 paths, or it can be eliminated from the circuit by setting the XTALIN, pin 9, high. The jitter attenu- ator on the CS61318 does not require a crystal, and can be activated by setting XTALIN, pin 9, low (preferred) or by floating pin 9. The jitter attenuator’s corner frequency is approxi- mately 1.25 Hz in order to comply with ETSI 300 011, CTR12, and recommendation I.431. A typical jitter attenuation graph is shown in Figure 8. 2.6 Receiver Loss of Signal The receiver will indicate loss of signal by setting LOS, pin 12 high (CR1.0 = 1 in host mode), upon power up, reset, when receiver gain is maximized, or upon receiving 175+/-15 consecutive zeros. Re- ceived zeros are counted based on recovered clock cycles. When in the LOS state, received data is not output from RPOS/RNEG (RDATA); but is squelched until the device comes out of LOS. The LOS condition is exited using ITU-T G.775 crite- ria, namely 12.5% ones density for 175+/-75 bit pe- riods with no more than 100 consecutive zeros. The receiver recovers signals down to -36 dB, and LOS will be declared below this signal level. In LOS, the RCLK frequency depends on whether MCLK is applied, and whether the jitter attenuator is in the transmit or receive path. If the jitter atten- uator is in the receive path, the jitter attenuator will hold over the average incoming data frequency pri- or to LOS. RPOS (RDATA) and RNEG pins are forced low upon LOS. When the jitter attenuator is in the transmit path or not used, the clock recovery is referenced to MCLK, if provided, or the crystal oscillator. The frequency of RCLK in this case will simply remain slaved to the clock reference upon loss of data. The recovered clock remains as a 50% duty cycle clock. 2.7 Local Loopback Local loopback is selected by setting LLOOP, pin 27, high (CR1.6 = 1 in host mode). Selecting local loopback causes clock and data presented on TCLK, TPOS/TNEG (TDATA) to be output at RCLK, RPOS/RNEG (RDATA). Inputs to the transmitter are still transmitted on TTIP and RCLK LATN 1 2 3 4 5 LATN = 1 RCLK, 9.5 dB of Attenuation LATN = 2 RCLK, 1 9.5 LATN = 3 RCLK, 28.5 dB of Attenuation LATN = 4 RCLK, 0 dB of Attenuation dB of Attenuation Figure 7. LATN Pulse Width encoding Frequency in Hz 10 20 30 40 50 60 1 10 100 1 k 10 k Minimum Attenuation Limit Measured Performance 0 CS61318 Figure 8. Typical Jitter Transfer Function |
类似零件编号 - CS61318-IL |
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类似说明 - CS61318-IL |
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