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ICS844002AGI-01LFT PDF预览

ICS844002AGI-01LFT

更新时间: 2024-11-04 11:14:39
品牌 Logo 应用领域
矽成 - ICSI 晶体外围集成电路光电二极管时钟
页数 文件大小 规格书
12页 161K
描述
FEMTOCLOCKS? CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

ICS844002AGI-01LFT 数据手册

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ICS844002I-01  
FEMTOCLOCKS™ CRYSTAL-TO-  
LVDS FREQUENCY SYNTHESIZER  
Integrated  
Circuit  
Systems, Inc.  
GENERAL DESCRIPTION  
FEATURES  
The ICS844002I-01 is a 2 output LVDS Two LVDS outputs  
Synthesizer optimized to generate Ethernet  
ICS  
• Selectable crystal oscillator interface  
or LVCMOS/LVTTL single-ended input  
HiPerClockS™  
reference clock frequencies and is a mem-  
ber of the HiPerClocksTM family of high  
performance clock solutions from ICS. Using a  
• Supports the following output frequencies: 156.25MHz,  
125MHz, 62.5MHz  
25MHz, 18pF parallel resonant crystal, the following  
frequencies can be generated based on the 2 frequency  
select pins (F_SEL[1:0]): 156.25MHz, 125MHz and  
62.5MHz. The ICS844002I-01 uses ICS’ 3rd generation  
low phase noise VCO technology and can achieve <1ps  
typical rms phase jitter, easily meeting Ethernet jitter  
requirements. The ICS844002I-01 is packaged in a small  
20-pin TSSOP package.  
• VCO range: 560MHz - 680MHz  
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal  
(1.875MHz - 20MHz): 0.41ps (typical)  
• Full 2.5V supply mode  
• -40°C to 85°C ambient operating temperature  
• Available in both, standard and RoHS/Lead-Free compliant  
packages  
PIN ASSIGNMENT  
FREQUENCY SELECT FUNCTION TABLE  
nc  
VDDO  
Q0  
VDDO  
1
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
Output Frequency (MHz)  
Q1  
2
M Divider N Divider  
nQ1  
3
(25MHz Reference)  
F_SEL1 F_SEL0  
Value  
Value  
GND  
VDD  
nQ0  
MR  
4
5
0
0
1
1
0
1
0
1
25  
4
156.25  
125  
nXTAL_SEL  
REF_CLK  
XTAL_IN  
XTAL_OUT  
F_SEL1  
nPLL_SEL  
nc  
VDDA  
F_SEL0  
VDD  
6
7
8
9
25  
25  
5
10  
62.5  
Not Used  
Not Used  
10  
ICS844002I-01  
20-Lead TSSOP  
6.5mm x 4.4mm x 0.92mm  
package body  
G Package  
Top View  
BLOCK DIAGRAM  
Pulldown  
2
F_SEL[1:0]  
Pulldown  
nPLL_SEL  
Q0  
F_SEL[1:0]  
0 0 ÷4  
nQ0  
Pulldown  
REF_CLK  
1
0
1
0 1 ÷5  
25MHz  
XTAL_IN  
1 0 ÷10  
1 1 not used  
VCO  
Phase  
Detector  
Q1  
625MHz  
OSC  
0
(w/25MHz  
Reference)  
nQ1  
XTAL_OUT  
Pulldown  
nXTAL_SEL  
M = 25 (fixed)  
Pulldown  
MR  
844002AGI-01  
www.icst.com/products/hiperclocks.html  
REV.A JANUARY 5, 2006  
1

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