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844002 Schematic ( PDF Datasheet ) - Integrated Device Technology

Teilenummer 844002
Beschreibung Crystal-to-LVDS Frequency Synthesizer
Hersteller Integrated Device Technology
Logo Integrated Device Technology Logo 




Gesamt 16 Seiten
844002 Datasheet, Funktion
FemtoClock® Crystal-to-LVDS
Frequency Synthesizer
844002
DATASHEET
GENERAL DESCRIPTION
The 844002 is a 2 output LVDS Synthesizer optimized to generate
Fibre Channel reference clock frequencies. Using a 26.5625MHz
18pF 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, 106.25MHz and 53.125MHz.
The 844002 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 844002 is packaged
in a small 20-pin TSSOP package.
FEATURES
• Two LVDS outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 212.5MHz,
187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz
• 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 lead-free (RoHS 6) package
FREQUENCY SELECT FUNCTION TABLE
Input
Frequency
(MHz)
26.5625
26.5625
26.5625
26.5625
23.4375
Inputs
F_SEL1
F_SEL0
M Divider
Value
N Divider
Value
M/N Divider
Value
0 0 24
3
0 1 24
4
1 0 24
6
1 1 24 12
0 0 24
3
8
6
4
2
8
Output
Frequency
(MHz)
212.5 (default)
159.375
106.25
53.125
187.5 (default)
BLOCK DIAGRAM
Pulldown
F_SEL[1:0]
nPLL_SEL Pulldown
REF_CLK Pulldown
26.5625MHz
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL Pulldown
1
0
2
Phase
Detector
VCO
637.5MHz
(w/26.5625MHz
Reference)
1
0
F_SEL[1:0]
0 0 ÷3
0 1 ÷4
1 0 ÷6
1 1 ÷12
PIN ASSIGNMENT
844002
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm
package body
G Package
Top View
Q0
nQ0
Q1
nQ1
M = 24 (fixed)
MR Pulldown
844002 REVISION B 6/9/15
1 ©2015 Integrated Device Technology, Inc.






844002 Datasheet, Funktion
844002 DATA SHEET
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 212.5MHZ
Fibre Channel Jitter Filter
212.5MHz
RMS Phase Jitter (Random)
637khz to 10MHz = 0.65ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Fibre Channel Filter to raw data
1k 10k 100k 1M 10M 100M
OFFSET FREQUENCY (HZ)
TYPICAL PHASE NOISE AT 106.25MHZ
Fibre Channel Jitter Filter
106.25MHz
RMS Phase Jitter (Random)
637khz to 10MHz = 0.74ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Fibre Channel Filter to raw data
1k
10k
100k
1M
10M 100M
OFFSET FREQUENCY (HZ)
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER
6
REVISION B 6/9/15

6 Page









844002 pdf, datenblatt
844002 DATA SHEET
RELIABILITY INFORMATION
TABLE 7. θ VS. AIR FLOW TABLE FOR 20 LEAD TSSOP
JA
θJA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
114.5°C/W
73.2°C/W
200
98.0°C/W
66.6°C/W
500
88.0°C/W
63.5°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for 844002 is: 2914
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER
12
REVISION B 6/9/15

12 Page





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