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參數(shù)資料
| 型號(hào)： | MAX3679AETJ+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 312.5 MHz, OTHER CLOCK GENERATOR, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, TQFN-32 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 391K |
| 代理商： | MAX3679AETJ+ |
MAX3679A
+3.3V, Low-Jitter Crystal to LVPECL
Clock Generator
8
_______________________________________________________________________________________
Crystal Selection
The crystal oscillator is designed to drive a fundamental
mode, AT-cut crystal resonator. See Table 3 for recom-
mended crystal specifications. See Figure 4 for external
capacitance connection.
Crystal Input Layout and
Frequency Stability
The crystal, trace, and two external capacitors should
be placed on the board as close as possible to the
MAX3679A’s X_IN and X_OUT pins to reduce crosstalk
of active signals into the oscillator.
The layout shown in Figure 3 gives approximately 3pF
of trace plus footprint capacitors per side of the crystal
(Y1). The dielectric material is FR4 and dielectric thick-
ness of the reference board is 15 mils. Using a 25MHz
crystal and the capacitor values of C22 = 27pF and
C23 = 33pF, the measured output frequency accuracy
is -14ppm at +25°C ambient temperature.
Table 2. Output Divider Configuration
INPUT
SELA1/SELB1
SELA0/SELB0
NA/NB DIVIDER
0
÷2*
1
0
÷4
1
÷5
0
OPEN
÷10
Table 3. Crystal Selection Parameters
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Crystal Oscillation
Frequency
fOSC
25
MHz
Shunt Capacitance
CO
2.0
7.0
pF
Load Capacitance
CL
18
pF
Equivalent Series
Resistance (ESR)
RS
50
Maximum Crystal
Drive Level
300
μW
Table 1. Output Frequency Determination
XO OR CMOS
INPUT
FREQUENCY
(MHz)
FEEDBACK
DIVIDER, M
VCO
FREQUENCY
(MHz)
OUTPUT
DIVIDER,
NA AND NB
OUTPUT
FREQUENCY
(MHz)
APPLICATIONS
÷2
312.5
÷4
156.25
÷5
125
25
625
÷10
62.5
Ethernet
*Maximum guaranteed output frequency is 160MHz for CMOS
and 320MHz for LVPECL output.
Figure 3. Crystal Layout
X_IN
X_OUT
27pF
25MHz CRYSTAL
(CL = 18pF)
33pF
Figure 4. Crystal, Capacitors Connection
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3679AETJ+ | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 3.3V Low-Jitter Crystal to LVPECL 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 |
| MAX3679AETJ+T | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 3.3V Low-Jitter Crystal to LVPECL 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 |
| MAX3679AEVKIT+ | 功能描述:時(shí)鐘和定時(shí)器開發(fā)工具 Not Available From Mouser RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| MAX3679CTJ+ | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 3.3V Low-Jitter Crystal to LVPECL 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 |
| MAX3679CTJ+T | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 3.3V Low-Jitter Crystal to LVPECL 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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