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參數(shù)資料
| 型號： | MAX3676 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 622Mbps, 3.3V Clock-Recovery and Data-Retiming IC with Limiting Amplifier |
| 中文描述： | 622Mbps、3.3V時鐘恢復(fù)與數(shù)據(jù)再定時IC，帶有限幅放大器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 181K |
| 代理商： | MAX3676 |
M
622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier
_______________________________________________________________________________________
9
The comparator is configured with an active-high LOP
output. An on-chip, 6k
pull-up resistor is provided to
reduce the external part count.
Setting the Loop Filter
The MAX3676 is designed for both regenerator and
receiver applications. Its fully integrated PLL is a classic
second-order feedback system, with a loop bandwidth
(f
L
) fixed at 250kHz. The external capacitor, C
F
, can be
adjusted to set the loop damping. Figures 2 and 3 show
the open-loop and closed-loop transfer functions. The
PLL zero frequency, f
Z
, is a function of external capaci-
tor C
F
, and can be approximated according to:
For an overdamped system (f
Z
/f
L
) <0.25, the jitter peak-
ing (M
P
) of a second-order system can be approximat-
ed by:
For example, using C
F
= 0.22μF results in a jitter peak-
ing of 0.27dB. Reducing C
F
below 0.22μF may result in
PLL instability. The recommended value for C
F
is 2.2μF
to guarantee a maximum jitter peaking of less than
0.1dB.
The MAX3676 is optimally designed to acquire lock and
to provide a bit-error rate (BER) of less than 10
-10
for
long strings of consecutive zeros and ones. Measured
results show that the MAX3676 can tolerate 1200 con-
secutive ones or zeros. Decreasing C
F
reduces the
number of tolerated consecutive identical zeros and
ones. C
F
must be a low-TC, high-quality capacitor of
type X7R or better.
Lock Detect
The MAX3676’s LOL monitor indicates when the PLL is
locked. Under normal operation, the loop is locked and
the
LOL
output signal is high. When the MAX3676 loses
lock, a fast negative-edge transition occurs on
LOL
.
The output level remains at a low level (held by C
LOL
)
until the loop reacquires lock (Figure 4).
M = 0log 1+
2
f
f
Z
L
f =
1
2
π
(
)
90 C
F
100
1k
10k
100k
C
F
= 0.22
μ
F
f
Z
= 8.04kHz
C
F
= 2.2
μ
F
f
Z
= 804Hz
1M
10M
f (Hz)
O
100
1k
10k
100k
C
F
= 0.22
μ
F
C
F
= 2.2
μ
F
0
-3
H(J2
π
f) (dB)
1M
10M
f (kHz)
C
Figure 2. Open-Loop Transfer Function
Figure 3. Closed-Loop Transfer Function
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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:計時器和支持產(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:計時器和支持產(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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