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參數(shù)資料
| 型號： | DS1080LU+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CRYSTAL MULT SS 8-USOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 晶體乘法器，擴(kuò)展頻譜時鐘發(fā)生器 |
| PLL： | 是 |
| 輸入： | 時鐘，晶體 |
| 輸出： | LVCMOS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 無/無 |
| 頻率 - 最大： | 134MHz |
| 除法器/乘法器： | 無/是 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1435 (CN2011-ZH PDF) |
Spread-Spectrum Crystal Multiplier
6
Maxim Integrated
DS1080L
Detailed Description
The DS1080L is a crystal multiplier with center spread-
spectrum capability. A 16MHz to 33.4MHz crystal is
connected to the X1 and X2 pins. Alternately, a 16MHz
to 33.4MHz clock can be applied to X1 in place of the
crystal. In such applications, X2 would be left open cir-
cuit. Using the CMSEL input, the user selects whether
the attached crystal or input clock is multiplied by 1, 2,
or 4. The DS1080L is capable of generating spread-
spectrum clocks from 16MHz to 134MHz.
The PLL can dither the output clock about its center fre-
quency at a user-selectable magnitude. Using the
SMSEL input, the user selects the dither magnitude.
The PDN input can be used to place the device into a
low-power standby mode where the SSO output is tri-
stated. If the PDN pin is open, the SSO output is active
but the spread-spectrum dithering is disabled. The
spread-spectrum dither rate is fixed at fIN / 992 to keep
the dither rate above the audio frequency range. On
power-up, the output clock (SSO) remains three-stated
until the PLL reaches a stable frequency (fSSO) and
dither (fDITHER).
Applications Information
Crystal Selection
The DS1080L requires a parallel resonating crystal
operating in the fundamental mode, with an ESR of less
than 90!. The crystal should be placed very close to
the device to minimize excessive loading due to para-
sitic capacitances.
Oscillator Input
When driving the DS1080L using an external oscillator
clock, consider the input (X1) to be high impedance.
Crystal Capacitor Selection
The load capacitors CL1 and CL2 are selected based
on the crystal specifications (from the data sheet of the
crystal used). The crystal parallel load capacitance is
calculated as follows:
For the DS1080L use CL1 = CL2 = CLX.
In this case, the equation then reduces to:
where CL1 = CL2 = CLX.
Equation 2 is used to calculate the values of CL1 and
CL2 based on values on CL and CIN noted in the data
sheet electrical specifications.
Power-Supply Decoupling
To achieve best results, it is highly recommended that
a decoupling capacitor is used on the IC power-supply
pins. Typical values of decoupling capacitors are
0.001F and 0.1F. Use a high-quality, ceramic, sur-
face-mount capacitor, and mount it as close as possi-
ble to the VCC and GND pins of the IC to minimize lead
inductance.
C
L
LX
IN
Equati
=
+
2
oon 2
C
x C
C
L
IN
=
+
1
2
1
2
Equation1
+1.5%
+1.0%
+0.5%
-0.5%
f0
-1.0%
-1.5%
DITHER CYCLE RATE = fDITHER = fIN/992
f SSO
t
Figure 1. Spread-Spectrum Frequency Modulation
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1080LU T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Spread-Spectrum Crystal Multiplier |
| DS1080LU/T+A00 | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Spread-Spectrum Crystal Multiplier 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 |
| DS1080LU/V | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Spread-Spectrum Crystal Multiplier |
| DS1080LU/V T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Spread-Spectrum Crystal Multiplier |
| DS1080LU/V+ | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Spread-Spectrum Crystal Multiplier 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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