Version 3.6 2003/08/22 ( 1 / 3 )
NJM2555
622MHz VCXO IC
s
GENERAL DESCRIPTION
The NJM2555 is a 622.08MHz VCXO (Voltage Controlled Crystal
Oscillator) IC designed for optical fiber telecommunication systems, using
NewJRC superior Bipolar technology, which consists of an oscillation
amplifier, a variable capacitor diode, a quadruple (x4) frequency circuit, high
pass filter, and limiter amplifier. The NJM2555 generate x4 frequency to add
the only 155.52MHz crystal and LC filter, and the output is differential
LVPECL equivalent. The recommended input crystal frequency is from 120
to 160 MHz. The jitter performance and phase noise is very low based on
excellent oscillation circuit. This can be applied to optical communication,
especially the WDM system.
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PACKAGE OUTLINE
NJM2555C-C NJM2555V
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FEATURES
q
Operating Voltage
+3.0V to +3.6V
q
Frequency range of Crystal
155.52 MHz typ. (120 to 160 MHz)
q
Output Frequency Range
622.08 MHz typ. (480 to 640 MHz)
q
Output Level
differential LVPECL equivalent
q
A Variable Capacitor on chip
q
Bipolar Technology
q
Package
Die and SSOP-10
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TERMINAL DESCRIPTION
s
COORDINATES
No. Symbol
Function
X
Y
1 V
OSC
OSC
Supply
Voltage
550 835
2
XT1
Quartz Crystal Connecting terminal 1
140
835
3
XT2
Quartz Crystal Connecting terminal 2
-80
835
4 V
VC
Frequency
Control
-435 835
5 GND GND=0V
-635 835
6 F
OUT1
Frequency
Output
1
-635 -835
7 F
OUT2
Frequency
Output
2
-395 -835
8
T1
Tunable Filter Terminal 1
165
-835
9
T2
Tunable Filter Terminal 2
405
-835
10 V
CC
V
CC
=3.3V 635
-835
Starting Point
:Die Center
unit:[um]
Chip Size
:1.60x2.00[mm]
Chip Thickness
:260
20[um]
Pad
Size
:90x90[um]
s
BLOCK DIAGRAM
OSC
BUFFER
AMP
HIGH
PASS
FILTER
LIMITER
AMP
OUTPUT
BUFFER
V
OSC
XT1
XT2
V
VC
GND
V
CC
T2
T1
F
OUT
2
F
OUT
1
2
3
4
5
6
7
8
9
10
1 10
2 9
3 8
4 7
5 6
Version 3.6 2003/08/22 ( 2 / 3 )
NJM2555
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ABSOLUTE MAXIMUM RATINGS
(Ta=25C)
Parameter Symbols
Ratings
Unit
Supply Voltage
V
CC
-0.3
to
5.0 V
Power Dissipation
P
D
250
(SSOP-10)
mW
Operating
Temperature
Range
Topr -40
to
+85 C
Storage Temperature Range
Tstg
-55 to +125
C
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ELECTRICAL
CHARACTERISTICS
(Ta=25C)
Parameter Symbol Conditions MIN.
TYP.
MAX.
Unit
Supply Voltage
V
CC
-
3.0 3.3 3.6 V
Operating Current
I
CC
F
OUT
=622MHz 40 50 60
mA
Power Consumption
P
D
F
OUT
=622MHz
120 165 216 mW
Maximum VC Range
V
CONTH
- V
CC
-0.3
V
CC
V
CC
+0.3 V
Minimum VC Range
V
CONTL
- -0.3
0
0.3
V
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REFERENTIAL DATA
(V
CC
=V
OSC
=3.3V, Ta=25C)
Parameter Symbol Conditions Min.
Typ.
Max.
Unit
Output Frequency
F
OUT
Min.: 120MHz crystal
Typ.: 155.5MHz crystal
Max.: 160MHz crystal
480 622 640
MHz
Frequency Pull Range
F
CONT
Note
1)
90
100
120
ppm
Output Level
P
OUT
50 ohm load
-1.5
1.5
4.5
dBm
Lower & Higher
Harmonics D/U Ratio
FDU
50 ohm load Note 2)
-20
-25
-
dBc
Symmetry
SYM
50 ohm load
45
50
55
%
Jitter
JITTER 50 ohm load
5
9
16
ps rms
Note 1) Frequency Pull Range is determined by using 155.5MHz quartz crystal.
The parameters are as follows;
L1=0.135mH, R1=15.22
, C1=7.72fF, Co=2.3pF
Note 2) Tunable Filters are connected at T1 & T2 terminals.
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TEST CIRCUIT & BLOCK DIAGRAM
L1
R1
C1
Co
X'tal
GND
FOUT2
XT2
V
OSC
XT1
V
CC
T1
T2
FOUT1
180nH
1000pF
1000pF
12nH
5pF
13.6p
1nF
V
VC
1nF
OSC
High
Pass
Filter
Buffer
AMP
Output
Buffer
LIMITER
AMP
1
V
VC
V
CC
FOUT
1nF
(Type: 033)
1000pF
(Type: 1005)
Version 3.6 2003/08/22 ( 3 / 3 )
NJM2555
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TERMINAL INFORMATION
No. Symbol
Equivalent
Circuit
Comment
2,
3,
and
4
XT1,
XT2,
and
V
VC
6,
7,
F
OUT1
,
F
OUT2
,
8,
9,
T1,
T2,
[CAUTION]
The specifications on this data book are only
given for information , without any guarantee
as regards either mistakes or omissions.
The application circuits in this data book are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
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