參數(shù)資料
型號(hào)： XRT91L32IQTR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 6/37頁(yè)
文件大小： 0K
描述： IC TXRX SONET/SDH 8BIT 100QFP
標(biāo)準(zhǔn)包裝： 1,000
類(lèi)型： 收發(fā)器
規(guī)程： SONET/SDH
電源電壓： 3.3V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 100-BQFP
供應(yīng)商設(shè)備封裝： 100-QFP（14x20）
包裝： 帶卷 (TR)
XRT91L32
xr
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
REV. 1.0.2
12
2.0
RECEIVE SECTION
The receive section of XRT91L32 include the inputs RXIP/N, followed by the clock and data recovery unit
(CDR) and receive serial-to-parallel converter. The receiver accepts the high speed Non-Return to Zero (NRZ)
serial data at 622.08 Mbps or 155.52 Mbps through the input interfaces RXIP/N. The clock and data recovery
unit recovers the high-speed receive clock from the incoming scrambled NRZ data stream. The recovered
serial data is converted into an 8-bit-wide, 77.76 Mbps or 19.44 Mbps parallel data and presented to the
RXDO[7:0] parallel interface. This parallel interface is designed for Single-Ended LVTTL operation. A divide-
by-8 version of the high-speed recovered clock RXPCLKOP/N, is used to synchronize the transfer of the 8-bit
RXDO[7:0] data with the receive portion of the framer/mapper device. Upon initialization or loss of signal or
loss of lock, the external reference clock signal of 19.44 MHz or 77.76 MHz is used to start-up the clock
recovery phase-locked loop for proper operation. In certain applications, the CDR block on the XRT91L32 can
be disabled and bypassed by enabling the CDRDIS pin to permit the flexibility of using an externally recovered
receive clock thru the XRXCLKIP/N pins.7
2.1
Receive Serial Input
The receive serial inputs are applied to RXIP/N. The receive serial inputs can be AC or DC coupled to an
optical module or an electrical interface. A simplified AC coupling block diagram is shown in Figure 3.(Also,
refer to application note TAN-9132.)
NOTE: Some optical modules integrate AC coupling capacitors within the module. AC or DC coupling is largely specific to
system design and optical module of choice.
FIGURE 3. RECEIVE SERIAL INPUT INTERFACE BLOCK
SFP, Optical Module
RXIP
RXIN
Optical Fiber
XRT91L32
STS-12/STM-4
or
STS-3/STM-1
Transceiver
82 Ohm
130 Ohm
XRXCLKIP
XRXCLKIN
(optional)
1KOhm
Install terminators close to
RXIP and RXIN pins
Tie unused differential input pins
to VCC and GND
Internally
AC coupled
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