參數(shù)資料
型號(hào)： XRT83L34IVTR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 24/99頁(yè)
文件大?。?/td> 0K
描述： IC LIU T1/E1/J1 QUAD 128TQFP
標(biāo)準(zhǔn)包裝： 750
類型： 線路接口裝置（LIU）
驅(qū)動(dòng)器/接收器數(shù)： 4/4
規(guī)程： T1，E1，J1
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 128-LQFP
供應(yīng)商設(shè)備封裝： 128-TQFP（14x20）
包裝： 帶卷 (TR)
XRT83L34
xr
REV. 1.0.1
QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
27
In Host mode the programming is achieved through the corresponding interface control bits, the state of the
CLKSEL[2:0] control bits and the state of the MCLKRATE interface control bit.
RECEIVER
RECEIVER INPUT
At the receiver input, a cable attenuated AMI signal can be coupled to the receiver through a capacitor or a 1:1
transformer. The input signal is first applied to a selective equalizer for signal conditioning. The maximum
equalizer gain is up to 36dB for T1 and 43dB for E1 modes. The equalized signal is subsequently applied to a
peak detector which in turn controls the equalizer settings and the data slicer. The slicer threshold for both E1
and T1 is typically set at 50% of the peak amplitude at the equalizer output. After the slicers, the digital
representation of the AMI signals are applied to the clock and data recovery circuit. The recovered data
subsequently goes through the jitter attenuator and decoder (if selected) for HDB3 or B8ZS decoding before
being applied to the RPOS_n/RDATA_n and RNEG_n/LCV_n pins. Clock recovery is accomplished by a digital
phase-locked loop (DPLL) which does not require any external components and can tolerate high levels of
input jitter that meets or exceeds the ITU-G.823 and TR-TSY000499 standards.
In Hardware mode only, all receive channels are turned on upon power-up and are always on. In Host mode,
each receiver channel can be individually turned on or off with the respective channel RXON_n bit. See
TABLE 1: MASTER CLOCK GENERATOR
MCLKE1
K
HZ
MCLKT1
K
HZ
CLKSEL2
CLKSEL1
CLKSEL0
MCLKRATE
MASTER CLOCK
K
HZ
2048
0
2048
0
1
1544
2048
1544
0
2048
1544
0
1
1544
0
1
0
2048
1544
0
1
1544
8
x
0
1
0
2048
8
x
0
1
0
1
1544
16
x
0
1
0
2048
16
x
0
1
1544
56
x
1
0
2048
56
x
1
0
1
1544
64
x
1
0
1
0
2048
64
x
1
0
1
1544
128
x
1
0
2048
128
x
1
0
1
1544
256
x
1
0
2048
256
x
1
1544
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