參數(shù)資料
型號(hào)： XR-T7295
廠商： Exar Corporation
英文描述： DS3/Sonet STS-1 Integrated Line Receiver
中文描述： DS3/Sonet STS - 1的集成線路接收器
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 226K
代理商： XR-T7295
XR-T7295
10
Rev. 1.05
OUTPUT JITTER
The total jitter appearing on the RCLK output during
normal operation consists of two components. First,
some jitter appears on RCLK because of jitter on the
incoming signal. (The next section discusses the jitter
transfer characteristic, which describes the relationship
between input and output jitter.) Second, noise sources
within the XR-T7295 device and noise sources that are
coupled into the device through the power supplies and
data pattern dependent jitter due to misequalization of the
input signal, all create jitter on RCLK. The magnitude of
this internally generated jitter is a function of the PLL
bandwidth, which in turn is a function of the input 1s
density. For higher 1s density, the amount of generated
jitter decreases. Generated jitter also depends on the
quality of the power supply bypassing networks used.
Figure 12shows the suggested bypassing network, and
Table 6lists the typical generated jitter performance.
Figure 7. Loss Characteristic of 728A
Coaxial Cable (450 ft.)
Figure 8. Phase Characteristic of 728A
Coaxial Cable (450 ft.)
01.0
2.0
5.0 10
Frequency (MHz)
12
10
20
50
100
0
1.0
2.0
5.0
10
Frequency (MHz)
100
80
60
40
20
20
50
100
L
P
JITTER TRANSFER CHARACTERISTIC
The jitter transfer characteristic indicates the fraction of
input jitter that reaches the RCLK output as a function of
input jitter frequency. Table 6shows Important jitter
transfer characteristic parameters. Figure 9also shows a
typical characteristic, with the operating conditions as
described in Table 6. Although existing standards do not
specify jitter transfer characteristic requirements, the
XR-T7295 information is provided here to assist in
evaluation of the device.
Parameter
Typ
Max
Unit
Generated Jitter
1
All 1s pattern
1.0
ns peak-to-peak
Repetitive “100”
pattern
Jitter Transfer
2
Characteristic
Peaking
f 3dB
1.5
ns peak-to-peak
0.05
0 05
205
0.1
dB
kHz
Notes
1
Repetitive input data pattern at nominal DSX-3 level with
V
DD
= 5V T
A
= 25
°
C.
2
Repetitive “100 ” input at nominal DSX-3 level with V
DD
= 5V,
T
A
= 25
°
C.
Table 6. Generated Jitter and Jitter Transfer
Characteristics
相關(guān)PDF資料
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