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844004AGT PDF预览

844004AGT

更新时间: 2024-11-05 10:01:35
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艾迪悌 - IDT /
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描述
Clock Generator

844004AGT 数据手册

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PRELIMINARY  
FEMTOCLOCKS™ CRYSTAL-TO-LVDS  
FREQUENCY SYNTHESIZER  
ICS844004  
GENERAL DESCRIPTION  
FEATURES  
The ICS844004 is a 4 output LVDS Synthesizer  
• Four LVDS outputs  
ICS  
HiPerClockS™  
optimized to generate Fibre Channel reference  
clock frequencies and is a member of the  
HiPerClocksTM family of high performance clock  
solutions from IDT. Using a 26.5625MHz 18pF  
• Selectable crystal oscillator interface  
or LVCMOS/LVTTL single-ended input  
• Supports the following output frequencies: 212.5MHz,  
187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz,  
53.125MHz  
parallel resonant crystal, the following frequencies can be  
generated based on the 2 frequency select pins (F_SEL[1:0]):  
212.5MHz, 187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz  
and 53.125MHz. The ICS844004 uses IDT’s 3rd generation  
low phase noise VCO technology and can achieve <1ps typical  
rms phase jitter, easily meeting Fibre Channel jitter  
requirements. The ICS844004 is packaged in a small 24-pin  
TSSOP package.  
• VCO range: 560MHz - 680MHz  
• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal  
(637kHz - 10MHz): 0.65ps (typical)  
• Full 3.3V or 2.5V supply modes  
• 0°C to 70°C ambient operating temperature  
• Available in both standard (RoHS 5) and lead-free (RoHS 6)  
packages  
FREQUENCY SELECT FUNCTION TABLE  
PIN ASSIGNMENT  
Inputs  
Output  
Frequency  
(MHz)  
nQ1  
Q1  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
nQ2  
Input  
M Divider N Divider M/N Divider  
Value  
2
Q2  
Frequency F_SEL1 F_SEL0  
(MHz)  
3
4
VDDo  
Q0  
VDDO  
Q3  
Value  
Value  
26.5625  
26.5625  
26.5625  
26.5625  
26.04166  
23.4375  
0
0
1
1
0
0
0
1
0
1
1
0
24  
24  
24  
24  
24  
24  
3
4
8
6
4
2
6
8
212.5  
159.375  
106.25  
53.125  
156.25  
187.5  
5
6
7
8
nQ0  
MR  
nPLL_SEL  
nc  
nQ3  
GND  
nc  
6
nXTAL_SEL  
9
VDDA  
TEST_CLK  
GND  
XTAL_IN  
XTAL_OUT  
12  
4
10  
11  
12  
F_SEL0  
VDD  
F_SEL1  
3
ICS844004  
24-Lead TSSOP  
4.40mm x 7.8mm x 0.92mm  
package body  
BLOCK DIAGRAM  
Pulldown  
2
F_SEL[1:0]  
G Package  
Top View  
Pulldown  
nPLL_SEL  
Q0  
F_SEL[1:0]  
0 0 ÷3  
nQ0  
Pulldown  
TEST_CLK  
1
0
1
0
0 1 ÷4  
Q1  
26.5625MHz  
XTAL_IN  
1 0 ÷6  
VCO  
637.5MHz  
(w/26.5625MHz  
Reference)  
1 1 ÷12  
nQ1  
Phase  
Detector  
OSC  
XTAL_OUT  
Q2  
Pulldown  
nXTAL_SEL  
nQ2  
M = 24 (fixed)  
Q3  
nQ3  
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 DeviceTechnology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.  
IDT/ ICSLVDS FREQUENCY SYNTHESIZER  
1
ICS844004AG REV AAUGUST 8, 2006  

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