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XRT83SL30 Datasheet(PDF) 11 Page - Exar Corporation |
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XRT83SL30 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 76 page áç áç áç áç XRT83SL30 SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR PRELIMINARY REV. P1.0.4 8 JITTER ATTENUATOR SIGNAL NAME PIN #TYPE DESCRIPTION JABW 46 I Jitter Attenuator Bandwidth In Hardware and E1 mode, when JABW=”0” the jitter attenuator bandwidth is 10Hz (normal mode). Setting JABW to “1” selects a 1.5Hz Bandwidth for the Jitter Attenuator and the FIFO length will be automatically set to 64 bits. In T1 mode the Jitter Attenuator Bandwidth is always set to 3Hz, and the state of this pin has no effect on the Bandwidth. See table under JASEL[1:0] pin, below. NOTE: Internally pulled “Low” with a 50k Ω resistor. JASEL1 JASEL0 47 48 I Jitter Attenuator select pin 1 Jitter Attenuator select pin 0 In Hardware Mode, JASEL0, JASEL1 and JABW pins are used to place the jitter attenuator in the transmit path, the receive path or to disable it and set the jitter attenuator bandwidth and FIFO size per the following table. NOTE: These pins are internally pulled "Low" with 50k Ω resistors. Disabled Transmit Receive Receive ------ 32/32 32/32 64/64 ------ 3 3 3 ------ 10 10 10 0 0 1 1 0 1 0 1 0 0 0 0 Disabled Transmit Receive Receive -------- 32/64 32/64 64/64 ------ 3 3 3 ------ 1.5 1.5 1.5 0 0 1 1 0 1 0 1 1 1 1 1 JA Path JA BW (Hz) FIFO Size T1/E1 JASEL1 JASEL0 JABW T1 E1 |
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