參數(shù)資料
型號： MAX3672
廠商： Maxim Integrated Products, Inc.
英文描述： Low-Jitter 155MHz/622MHz Clock Generator
中文描述： 低抖動、155MHz/622MHz時鐘發(fā)生器
文件頁數(shù)： 11/12頁
文件大小： 493K
代理商： MAX3672
M
Low-Jitter 155MHz/622MHz Clock Generator
______________________________________________________________________________________
11
LOL
Setup
The
LOL
output indicates if the PLL has locked onto the
reference clock using an XOR gate and comparator. The
comparator threshold can be adjusted with THADJ, and
the XOR gate output can be filtered with a capacitor
between CTH and ground (Figure 3). When the voltage
at pin CTH exceeds the voltage at pin THADJ, then the
LOL
output goes low and indicates that the PLL is not
locked. Note that excessive jitter on the reference clock
input at frequencies above the loop bandwidth may
degrade LOL functionality.
The user can set the amount of frequency or phase dif-
ference between VCO and reference clock at which
LOL
indicates an out-of-lock condition. The frequency
difference is called the beat frequency. The CTH pin
can be connected to an external capacitor, which sets
the lowpass filter frequency to approximately
This lowpass filter frequency should be set about 10
times lower then the beat frequency to ensure that the
filtered signal at CTH does not drop below the THADJ
threshold voltage. Internal comparisons occur at the
pre-divider output frequency (see Table 1 for VCO and
reference clock setup). For example, assume the pre-
divider output frequency is 19.44MHz. For a 1ppm sen-
sitivity, the minimum beat frequency is 19Hz, and the
filter should be set to 1.9Hz. Set CTH to 1.36uF.
The voltage at THADJ will determine the level at which
the
LOL
output flags. THADJ is set to a default value of
0.6V which corresponds to a 45
°
phase difference. This
value can be overridden by applying the desired
threshold voltage to the THADJ input. The range of
THADJ is 0V (0
°
) to 2.4V (180
°
).
f
C
k
L
TH
=
π
1
2
60
Bond Pad Coordinates
PAD COORDINATES (μm)
X
50.8
50.8
50.8
50.8
50.8
50.8
50.8
50.8
50.8
266.8
420.7
574.6
728.5
882.4
1036.2
1190.1
1344
1549.2
1792.2
1792.2
1792.2
1792.2
1792.2
1792.2
1792.2
1792.2
1792.2
1792.2
1565.4
1411.5
1257.6
1103.7
893.2
685.3
531.4
377.5
223.6
PAD
Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
1557.3
1408.8
1179.3
1028.1
874.2
720.4
566.5
412.6
258.7
50.8
50.8
50.8
50.8
50.8
50.8
50.8
50.8
50.8
256
409.9
563.8
717.7
871.6
1025.4
1179.3
1333.2
1530.3
1692.3
1692.3
1692.3
1692.3
1692.3
1692.3
1692.3
1692.3
1692.3
1692.3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3672E/D 功能描述:時鐘發(fā)生器及支持產(chǎn)品 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
MAX3672E/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX3673DBETN+ 功能描述:時鐘合成器/抖動清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
MAX3673ETN 功能描述:時鐘合成器/抖動清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
MAX3673ETN+ 功能描述:時鐘合成器/抖動清除器 Low-Jitter Frequency Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
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