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参数资料
| 型号： | MAX3679CTJ+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 625 MHz, OTHER CLOCK GENERATOR, QCC32 |
| 封装： | 5 X 5 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, MO-220WHHD-2, TQFN-32 |
| 文件页数： | 10/11页 |
| 文件大小： | 390K |
| 代理商： | MAX3679CTJ+ |
MAX3679
+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
MAX3679’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 FR-4 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 Chart
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
300
μW
Table 1. Output Frequency Determination Chart
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3679CTJ+ | 功能描述:时钟发生器及支持产品 3.3V Low-Jitter Crystal to LVPECL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MAX3679CTJ+T | 功能描述:时钟发生器及支持产品 3.3V Low-Jitter Crystal to LVPECL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MAX367C/D | 功能描述:TVS二极管阵列 Signal-Line Circuit Protector RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C |
| MAX367C/D+ | 功能描述:TVS二极管阵列 RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C |
| MAX367CPN | 功能描述:TVS二极管阵列 RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C |
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