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參數(shù)資料
| 型號(hào)： | MAX3676 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 622Mbps, 3.3V Clock-Recovery and Data-Retiming IC with Limiting Amplifier |
| 中文描述： | 622Mbps、3.3V時(shí)鐘恢復(fù)與數(shù)據(jù)再定時(shí)IC，帶有限幅放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 181K |
| 代理商： | MAX3676 |
M
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
______________________________________________________________________________________
11
Reduced Power Consumption
Without the Limiting Amplifier
The limiting amplifier is biased independently from the
clock recovery circuitry. Grounding INSEL turns off the
limiting amplifier and selects the PECL DDI inputs.
Converting Average Optical Power
to Signal Amplitude
Many of the MAX3676’s specifications relate to input-
signal amplitude. When working with fiber optic
receivers, the input is usually expressed in terms of
average optical power and extinction ratio. The rela-
tions given in Table 2 and Figure 6 are helpful for con-
verting optical power to input signal when designing
with the MAX3676.
In an optical receiver, the input voltage to the limiting
amplifier can be found by multiplying the relationship in
Table 2 by the photodiode responsivity and transim-
pedance amplifier gain.
Optical Hysteresis
Power and hysteresis are often expressed in decibels.
By definition, decibels are always 10log (power). At the
inputs to the MAX3676 limiting amplifier, the power is
V
IN
2
/R. If a receiver’s optical input power (x) increases
by a factor of two, and the preamplifier is linear, then the
voltage at the input to the MAX3676 also increases by a
factor of two.
The optical power increase is:
10log(2x/x) = 10log(2) = +3dB
At the MAX3676, the voltage increase is:
2
log
log(
V
/ R
IN
In an optical receiver, the decibel change at the
MAX3676 always equals 2x the optical decibel change.
The MAX3676’s typical voltage hysteresis is 3.0dB. This
provides an optical hysteresis of 1.5dB.
Jitter in Optical Receivers
Timing jitter, edge speeds, aberrations, optical disper-
sion, and attenuation all impact the performance of
high-speed clock recovery for SDH/SONET receivers
(Figure 7). These effects decrease the time available
for error-free data recovery by reducing the received
“eye opening” of nonreturn-to-zero (NRZ) transmitted
signals.
10
10
2
20
2
6
2
2
)
log( )
2V
(
/ R
IN
)
=
=
= +
dB
TIME
P0
P1
P
AVE
Figure 6. Optical Power Relations
Table 2. Optical-Power Relations*
*Assuming a 50% average input-data duty cycle
SYMBOL
RELATION
Average
Power
P
AVG
Extinction
Ratio
r
e
PARAMETER
Optical Power
of a “1”
P1
Optical Power
of a “0”
P0
Signal
Amplitude
P
IN
P
= P0 + P1 / 2
AVG
(
)
r = 1 / P0
P
P
r
r
AVG
e
+
(
e
1
2
1
=
P0
2P
/ r
1
AVG
e
=
+
)
P
P
P
P
r
r
IN
AVG
e
e
=
=
+
(
)
1
0
2
1
1
A
A
EYE DIAGRAM WITH NO TIMING JITTER
EFFECTS OF TIMING JITTER ON EYE DIAGRAM
TIME
MIDPOINT
TIME
MIDPOINT
Figure 7. Eye Diagram With and Without Timing Jitter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3676E/D | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MAX3676E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3676E/D+ | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MAX3676EHJ | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 622Mbps 3.3V Clock Recovery RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MAX3676EHJ+ | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 622Mbps 3.3V Clock Recovery RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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