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ICS840004AGL PDF预览

ICS840004AGL

更新时间: 2024-11-14 04:58:11
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矽成 - ICSI /
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13页 311K
描述
FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

ICS840004AGL 数据手册

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PRELIMINARY  
ICS840004  
Integrated  
Circuit  
Systems, Inc.  
FEMTO  
CLOCKS™ CRYSTAL- -  
TO  
LVCMOS/LVTTL FREQUENCY  
SYNTHESIZER  
GENERAL DESCRIPTION  
FEATURES  
The ICS840004 is a 4 output LVCMOS/LVTTL • Four LVCMOS/LVTTL outputs, 15typical output impedance  
ICS  
Synthesizer optimized to generate Ethernet  
• Selectable crystal oscillator interface  
HiPerClockS™  
reference clock frequencies and is a member of  
or LVCMOS single-ended input  
the HiPerClocksTM family of high performance  
• Supports the following input frequencies:  
212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and  
53.125MHz  
clock solutions from ICS. Using a 26.5625MHz,  
18pF parallel resonant crystal, the following frequencies can be  
generated based on the 2 frequency select pins (F_SEL1:0):  
212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and  
53.125MHz.The ICS840004 uses ICS3rd generation low phase  
noise VCO technology and can achieve 1ps or lower typical  
random rms phase jitter, easily meeting Ethernet jitter  
requirements. The ICS840004 is packaged in a small 20-pin  
TSSOP package.  
• RMS phase jitter @ 212.5MHz (637KHz - 10MHz):  
0.98ps typical  
• RMS phase noise at 212.5MHz, VDDO = 3.3V  
Phase noise:  
Offset  
Noise Power  
100Hz ............... -88.8 dBc/Hz  
1KHz ..............-109.0 dBc/Hz  
10KHz ..............-116.1 dBc/Hz  
100KHz ..............-117.5 dBc/Hz  
• Full 3.3V or 3.3V core/2.5V output supply mode  
• 0°C to 70°C ambient operating temperature  
FREQUENCY SELECT FUNCTION TABLE  
Inputs  
Output  
Frequency  
Range  
Input  
Frequency  
M Divider N Divider  
M/N  
Ratio Value  
F_SEL1 F_SEL0  
Value  
Value  
26.5625  
26.5625  
26.5625  
26.5625  
26.04166  
0
0
1
1
0
0
1
0
1
1
24  
3
8
6
4
2
6
212.5  
159.375  
106.25  
53.125  
156.25  
24  
24  
24  
24  
4
6
12  
4
BLOCK DIAGRAM  
PIN ASSIGNMENT  
Pullup  
OE  
1
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
F_SEL0  
nc  
F_SEL1  
GND  
Q0  
2
3
4
5
6
7
8
9
2
Pulldown:Pulldown  
F_SEL1:0  
nXTAL_SEL  
TEST_CLK  
OE  
MR  
nPLL_SEL  
VDDA  
Q1  
VDDO  
Q2  
Q3  
GND  
XTAL_IN  
XTAL_OUT  
Pulldown  
nPLL_SEL  
Pulldown  
nXTAL_SEL  
26.5625MHz  
XTAL_IN  
nc  
VDD  
F_SEL1:0  
0
Q0  
Q1  
10  
OSC  
1
0
N
0 0 ÷3  
XTAL_OUT  
Pulldown  
ICS840004  
20-LeadTSSOP  
6.5mm x 4.4mm x 0.92mm  
package body  
0 1 ÷4  
Phase  
Detector  
1
TEST_CLK  
VCO  
1 0 ÷6 (default)  
1 1 ÷12  
Q2  
Q3  
G Package  
Top View  
M = ÷24 (fixed)  
Pulldown  
MR  
The Preliminary Information presented herein represents a product in prototyping or pre-production.The noted characteristics are based on initial  
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.  
840004AG  
www.icst.com/products/hiperclocks.html  
REV. A SEPTEMBER 16, 2004  
1

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