參數(shù)資料
型號(hào)： XRT7300IVTR-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 24/55頁(yè)
文件大?。?/td> 0K
描述： IC LIU E3/DS3/STS-1 SGL 44TQFP
標(biāo)準(zhǔn)包裝： 1,000
類型： 線路接口裝置（LIU）
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： DS3，E3，STS-1
電源電壓： 4.75 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 44-LQFP
供應(yīng)商設(shè)備封裝： 44-TQFP（10x10）
包裝： 帶卷 (TR)
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
26
interface the Receive Section of the XRT7300 to the
line as shown in Figure 16 or Figure 17.
3.2
THE RECEIVE EQUALIZER BLOCK
After the XRT7300 has received the incoming line
signal via the RTIP and RRING input pins, the first
block that this signal passes through is the AGC cir-
cuit followed by the Receive Equalizer.
As the line signal is transmitted from a given transmit-
ting terminal, the pulse shapes at that location are ba-
sically square. Hence, these pulses consist of a com-
bination of “Low” and “High” frequency Fourier com-
ponents. As this line signal travels from the transmit-
ting terminal via the coaxial cable to the receiving
terminal, it is subjected to frequency-dependent loss.
In other words, the higher-frequency components of
the signal is subjected to a greater amount of attenu-
ation than the lower-frequency components. If this
line signal travels over reasonably long cable lengths
(e.g., greater than 450 feet), then the shape of the
pulses (which were originally square) is distorted and
inter-symbol interference increases.
The purpose of the Receive Equalizer is to equalize
the distortion of the incoming signal due to cable loss.
The Receive Equalizer accomplishes this by subject-
ing the received line signal to frequency-dependent
amplification (which attempts to counter the frequen-
cy dependent loss that the line signal has experi-
enced) and to restore the shape of the line signal so
FIGURE 16. RECOMMENDED SCHEMATIC FOR INTERFACING THE RECEIVE SECTION OF THE XRT7300 TO THE LINE
(TRANSFORMER-COUPLING)
BNC
1:1
R1
37.5
R2
37.5
RTIP
RRING
C1
0.01uF
RPOS
RNEG
RCLK1
RLOS
RLOL
RxLOS
RxLOL
RxPOS
RxNEG
RxLineClk
T2
FIGURE 17. RECOMMENDED SCHEMATIC FOR INTERFACING THE RECEIVE SECTION OF THE XRT7300 TO THE LINE
(CAPACITIVE-COUPLING)
R1
75
RTIP
RRING
C1
0.01uF
C2
0.01uF
Receive Line Signal
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