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XRT91L81 Datasheet(PDF) 9 Page - Exar Corporation |
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XRT91L81 Datasheet(HTML) 9 Page - Exar Corporation |
9 / 40 page XRT91L81 2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER PRELIMINARY REV. P1.0.3 7 REFFREQSEL LVTTL I P1 Reference Clock Frequency Select Hardware Mode This pin is used to select the frequency of the REFCLK input to the CMU. "Low" = 77.76MHz (83.5MHz for FEC) "High" = 155.52MHz (167MHz for FEC) VCXO_SEL LVTTL I M6 Selects De-Jitter VCXO Option Hardware Mode This pin selects either the normal REFCLK or the de-jitter VCXO as a reference clock. "Low" = Normal REFCLK Mode "High" = De-Jitter VCXO Mode VCXO_LOCK LVTTL O N8 De-Jitter PLL Lock Detect If the de-jitter PLL lock detect is enabled with Pin P3 and the de-jitter VCXO mode is selected by Pin M6, this pin will pull "High" when the PLL is locked. "Low" = VCXO out of Lock "High" = VCXO Locked VCXO_LOCKEN LVTTL I P3 De-Jitter PLL Lock Detect Enable Hardware Mode This pin enables the VCXO lock detect Pin N8 to be active. "Low" = VCXO_LOCK disabled "High" = VCXO_LOCK enabled CPOUT - O P8 Charge Pump Output (for external VCXO) The nominal output of the charge pump is 250 µA LOOPBW LVTTL I M7 CMU Loop Bandwidth Select Hardware Mode This pin is used to select the bandwidth of the clock multiplier unit of the transmit path to a narrow or wide band. "Low" = Narrow Band (1x) "High" = Wide Band (4x) TXPCLKOP TXPCLKON LVDS O P10 P11 Transmit Clock Output (622/666 MHz) This clock can be used for the downstream device to generate the TXDI data and TXCLK. This enables the downstream device and the OC-48 transceiver to be in synchronization. TXCLKO16P TXCLKO16N LVDS O N10 N11 Auxillary Clock 155.52(166)MHz auxillary clock derived from CMU output. This clock can also be used for the downstream device as a refer- ence for generating the TXDI data and TXCLK. This enables the downstream device and the OC-48 transceiver to be in syn- chronization. TRITXCLKO16 LVTTL I M12 Tri-State Enable Hardware Mode This pin is used to tri-state the auxillary clock. "Low" = TXCLKO16 Enabled "High" = TXCLKO16 Tri-State TRANSMITTER SECTION NAME LEVEL TYPE PIN DESCRIPTION |
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