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參數(shù)資料
| 型號： | ICS8431AM-21LF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 350 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| 封裝： | 7.50 X 18.05 MM, 2.25 MM HEIGHT, ROHS COMPLIANT, MS-013, MO-119, SOIC-28 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大小： | 342K |
| 代理商： | ICS8431AM-21LF |
IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
2
ICS8431AM-21 REV. A MAY 30, 2007
ICS8431-21
350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
puts M0 through M8. While the nP_LOAD input is held LOW,
the data present at M0:M8 is transparent to the M divider. On
the LOW-to-HIGH transition of nP_LOAD, the M0:M8 data is
latched into the M divider and any further changes at the M0:M8
inputs will not be seen by the M divider until the next LOW
transition on nP_LOAD.
The relationship between the VCO frequency, the crystal fre-
quency and the M divider is defined as follows:
The M value and the required values of M0:M8 for programming
the VCO are shown in Table 3B, Programmable VCO Frequency
Function Table. The frequency out is defined as follows:
For the ICS8431-21, the output divider may be set to either
÷2
or
÷4 by the DIV_SEL pin. For an input of 16 MHz, valid
M values for which the PLL will achieve lock are defined as:
250
≤ M ≤ 511.
FUNCTIONAL DESCRIPTION
The ICS8431-21 features a fully integrated PLL and therefore
requires no external components for setting the loop bandwidth.
The output of the oscillator is divided by 16 prior to the phase
detector. With a 16MHz crystal this provides a 1MHz reference
frequency. The VCO of the PLL operates over a range of 250MHz
to 700MHz. The output of the M divider is also applied to the
phase detector.
The phase detector and the M divider force the VCO output
frequency to be M times the reference frequency by adjusting
the VCO control voltage. Note that for some values of M (either
too high or too low), the PLL will not achieve lock. The output of
the VCO is scaled by a divider prior to being sent to the LVPECL
output buffer. The divider provides a 50% output duty cycle.
The programmable features of the ICS8431-21 support four
output operational modes and a programmable M divider and
output divider. The four output operational modes are spread
spectrum clocking (SSC), non-spread spectrum clock and
two test modes and are controlled by the SSC_CTL[1:0] pins.
The PLL loop divider or M divider is programmed by using in-
16
M
fVCO =
fxtal x
N
FOUT =
fVCO
=
16 x N
fxtal x M
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ICS8431AM-21LFT | 功能描述:IC SYNTHESIZER 350MHZ 28-SOIC RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標準包裝:1,000 系列:- 類型:時鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應商設備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS8431AM-21T | 制造商:ICS 制造商全稱:ICS 功能描述:350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8431AMI-21 | 制造商:ICS 制造商全稱:ICS 功能描述:350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8431AMI-21LF | 功能描述:IC SYNTHESIZER 350MHZ 28-SOIC RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標準包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| ICS8431AMI-21LFT | 功能描述:IC SYNTHESIZER 350MHZ 28-SOIC RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標準包裝:1,000 系列:- 類型:時鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應商設備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
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