- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄360771 > ICS8431AMI-21T 350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER PDF資料下載
參數(shù)資料
| 型號(hào)： | ICS8431AMI-21T |
| 英文描述： | 350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | 350MHz頻段，低抖動(dòng)，晶體振蕩器到3.3的LVPECL頻率合成器 |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大小： | 207K |
| 代理商： | ICS8431AMI-21T |
第1頁(yè)當(dāng)前第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
8431AMI-21
www.icst.com/products/hiperclocks.html
REV. A AUGUST 2, 2005
2
Integrated
Circuit
Systems, Inc.
ICS8431I-21
350MH
Z
, L
OW
J
ITTER
, C
RYSTAL
O
SCILLATOR
-
TO
-3.3V LVPECL F
REQUENCY
S
YNTHESIZER
The PLL loop divider or M divider is programmed by using
inputs 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:
fVCO =16
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:
FOUT=fN
For the ICS8431I-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.
F
UNCTIONAL
D
ESCRIPTION
The ICS8431I-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 (ei-
ther 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 ICS8431I-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.
M
16 x N
fxtal x M
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS8431I-21 | 350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8432-11 | 700MHZ/350MHZ, LOW PHASE NOISE, CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8430CY-11T | 700MHZ/350MHZ, LOW PHASE NOISE, CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8432CY-11 | 700MHZ/350MHZ, LOW PHASE NOISE, CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS84320-01K | 780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS8431CM-01 | 制造商:ICS 制造商全稱:ICS 功能描述:200MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431CM-01T | 制造商:ICS 制造商全稱:ICS 功能描述:200MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431CM-11 | 制造商:ICS 制造商全稱:ICS 功能描述:255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431CM-11T | 制造商:ICS 制造商全稱:ICS 功能描述:255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431EM11 | 制造商:ICS 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。