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參數(shù)資料
| 型號： | XRT7295ATIWTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 18/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RCVR DS3/SONET STS-1 20SOJ |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 接收器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | DS3，STS-1 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-BSOJ |
| 供應(yīng)商設(shè)備封裝： | 20-SOJ |
| 包裝： | 帶卷 (TR) |
XRT7295AT
9
Rev.1.20
STS-1 SIGNAL REQUIREMENTS AT THE STSX
For STS-1 operation, the cross-connect is referred at the
STSX-1. Table 4 lists the signal requirements at the
STSX-1. Instead of the DS3 isolated pulse template, an
eye diagram mask is specified for STS-1 operation
(TA-TSY-000253). The XRT7295AT correctly decodes
any transmitted signal that meets the mask shown in
Figure 6
at the STSX-1.
Parameter
Specification
Line Rate
51.84 Mbps
Line Code
Bipolar with three-0 substitution (B3ZS)
Test Load
75W±5%
Power Levels
A wide-band power level measurement
at the STSX-1 interface using a low-pass
filter with a 3dB cutoff frequency of at
least 200MHz is within -2.7 dBm and 4.7
dBm.
Table 4. STSX-1 Interconnection Specification
Figure 6. STSX-1 Isolated Pulse Template for Bellcore TA-TSY-000253
1.0
0.8
0.6
0.4
0.2
0
-1.0
-0.5
0
0.5
1.0
1.5
2.0
Time Slots - Normalized To Peak Location
N
o
rm
al
iz
ed
A
m
p
lit
u
d
e
LINE TERMINATION AND INPUT CAPACITANCE
The recommended receive termination is shown in
Figure 3
The 75 W resistor terminates the coaxial cable
with its characteristic impedance. The 0.01mF capacitor
to RIN couples the signal into the receive input without
disturbing the internally generated DC bias level present
on RIN. The input capacitance at the RIN pin is 2.8pF
typical.
LOSS LIMITS FROM THE DSX-3 TO THE RECEIVE
INPUT
The signal at the cross-connect may travel through a
distribution frame, coaxial cable, connector, splitters, and
back planes before reaching the XRT7295AT device.
This section defines the maximum distribution frame and
cable loss from the cross-connect to the XRT7295AT
input.
The distribution frame jack may introduce 0.6 ±0.55 dB
of loss. This loss may be any combination of flat or
shaped (cable) loss.
The maximum cable distance between the point where
the transmitted signal exits the distribution frame jack and
the XRT7295AT device is 450 ft. (see Figure 2.) The
coaxial cable (Type 728A) used for specifying this
distance limitation has the loss and phase characteristics
shown in Figure 7 and Figure 8. Other cable types also
may be acceptable if distances are scaled to maintain
cable loss equivalent to Type 728A cable loss.
TIMING RECOVERY
External Loop Filter Capacitor
Figure 3
shows the connection to an external 0.1mF
capacitor at the LPF1/LPF2 pins. This capacitor is part of
the PLL filter. A non-polarized, low-leakage capacitor
should be used. A ceramic capacitor with the value 0.1mF
± 20% is acceptable.
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參數(shù)描述 |
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| XRT7295CTIW | 功能描述:總線接收器 DS3/E3/SONET STS-1 Line Receiver RoHS:否 制造商:Texas Instruments 接收機數(shù)量:4 接收機信號類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel |
| XRT7295CTIW-F | 功能描述:總線接收器 DS3/E3/SONET STS-1 Line Receiver RoHS:否 制造商:Texas Instruments 接收機數(shù)量:4 接收機信號類型:Differential 接口類型:EIA/TIA-422-B, V.11 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-16 封裝:Reel |
| XRT7295E | 制造商:EXAR 制造商全稱:EXAR 功能描述:INTEGRATED LINE RECEIVER |
| XR-T7295E | 制造商:EXAR 制造商全稱:EXAR 功能描述:INTEGRATED LINE RECEIVER |
| XR-T7295E-1EIP | 制造商:EXAR 制造商全稱:EXAR 功能描述:INTEGRATED LINE RECEIVER |
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