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參數(shù)資料
| 型號： | T7295-1 |
| 廠商： | Lineage Power |
| 英文描述： | E3 Integrated Line Receiver(E3 集成線接收器) |
| 中文描述： | 綜合線接收E3展（E3展集成線接收器） |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 321K |
| 代理商： | T7295-1 |
Data Sheet
February 1997
T7295-1 E3 Integrated Line Receiver
7
Lucent Technologies Inc.
Timing Recovery
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 relation-
ship between input and output jitter.) Second, noise
sources, both within the T7295-1 device and those that
are coupled into the device through the power sup-
plies, create jitter on RCLK. The magnitude of this
internally generated jitter is a function of the PLL band-
width, which, in turn, is a function of the input 1s den-
sity. For higher 1s densities, the amount of generated
jitter decreases. Generated jitter also depends on the
quality of the power supply bypassing networks used.
Table 4 lists the typical generated jitter performance
achievable with the suggested bypassing network
shown in Figure 8.
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 4 shows important jitter
transfer characteristic parameters.
Table 4. Generated Jitter and Jitter Transfer
Characteristics
* Nominal E3 levels with V
DD
= 5 V, T
A
= 25
°
C.
Repetitive 1000 input pattern at nominal E3 levels with V
DD
= 5 V,
T
A
= 25
°
C.
Jitter Accommodation
Under all allowable operating conditions, the jitter
accommodation of the T7295-1 device exceeds the
system requirements for error-free operation
(BER < 1e
–9
). The typical (V
DD
= 5.0 V, T
A
= 25
°
C, E3
nominal signal level) jitter accommodation of the
T7295-1 is also shown in Figure 6.
Parameter
Typ
Max
Unit
Generated Jitter:*
All-1s Pattern
Repetitive 1000 Pattern
Jitter Transfer Characteristic:
Peaking
f
3dB
1.0
1.5
—
—
ns pk-to-pk
ns pk-to-pk
0.05
115
0.1
—
dB
kHz
5-2997(C)r.4
Figure 6. Typical Jitter Accommodation of the T7295-1 E3 Device
10.00
1.50
1.00
P
0.15
0.10
0.01
10
100
1k
10k
100k
20k
50k
200k 400k 800k
JITTER FREQUENCY (Hz)
1M
ITU-T G.823 MASK
PRBS
2
23
– 1
3.6
1.5
0.42
0.3
1000 PATTERN
0.55
0.47
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