NJM2555
622MHz VCXO IC
sPACKAGE
OUTLINE
sGENERAL
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
NJM2555C-C
NJM2555V
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.
sFEATURES
qOperating
Voltage
qFrequency
range of Crystal
qOutput
Frequency Range
qOutput
Level
qA
Variable Capacitor on chip
qBipolar
Technology
qPackage
+3.0V to +3.6V
155.52 MHz typ. (120 to 160 MHz)
622.08 MHz typ. (480 to 640 MHz)
differential LVPECL equivalent
Die and SSOP-10
sCOORDINATES
X
550
140
-80
-435
-635
-635
-395
165
405
635
Y
835
835
835
835
835
-835
-835
-835
-835
-835
unit:[um]
5
4
3
2
１
sTERMINAL
DESCRIPTION
No. Symbol
Function
1
V
OSC
OSC Supply Voltage
2
XT1
Quartz Crystal Connecting terminal 1
3
XT2
Quartz Crystal Connecting terminal 2
4
V
VC
Frequency Control
5
GND
GND=0V
6
F
OUT1
Frequency Output 1
7
F
OUT2
Frequency Output 2
8
T1
Tunable Filter Terminal 1
9
T2
Tunable Filter Terminal 2
10
V
CC
V
CC
=3.3V
Starting Point
:Die Center
Chip Size
:1.60x2.00[mm]
Chip Thickness
:260
±20[um]
Pad Size
:90x90[um]
sBLOCK
DIAGRAM
V
OSC
6
7
8
9
10
1
2
3
4
5
10
9
8
7
6
V
CC
XT1
XT2
OSC
BUFFER
AMP
HIGH
PASS
FILTER
LIMITER
AMP
T2
T1
V
VC
F
OUT
2
GND
OUTPUT
BUFFER
F
OUT
1
Version 3.6 2003/08/22 ( 1 / 3 )
NJM2555
sABSOLUTE
MAXIMUM RATINGS
Parameter
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
sELECTRICAL
CHARACTERISTICS
Parameter
Symbol
Supply Voltage
V
CC
Operating Current
I
CC
Power Consumption
P
D
Maximum VC Range
V
CONTH
Minimum VC Range
V
CONTL
sREFERENTIAL
DATA
Parameter
Output Frequency
Symbols
V
CC
P
D
Topr
Tstg
Ratings
-0.3 to 5.0
250 (SSOP-10)
-40 to +85
-55 to +125
(Ta=25°C)
Unit
V
mW
°C
°C
(Ta=25°C)
MAX.
Unit
3.6
V
60
mA
216
mW
V
CC
+0.3
V
0.3
V
Conditions
-
F
OUT
=622MHz
F
OUT
=622MHz
-
-
MIN.
3.0
40
120
V
CC
-0.3
-0.3
TYP.
3.3
50
165
V
CC
0
Symbol
F
OUT
Frequency Pull Range
F
CONT
±90
±100
Output Level
P
OUT
-1.5
1.5
Lower & Higher
FDU
50 ohm load Note 2)
-20
-25
Harmonics D/U Ratio
Symmetry
SYM
50 ohm load
45
50
Jitter
JITTER 50 ohm load
5
9
Note 1) Frequency Pull Range is determined by using 155.5MHz quartz crystal.
The parameters are as follows;
L1=0.135mH, R1=15.22Ω, C1=7.72fF, Co=2.3pF
L1
Note 2) Tunable Filters are connected at T1 & T2 terminals.
Conditions
Min.: 120MHz crystal
Typ.: 155.5MHz crystal
Max.: 160MHz crystal
Note 1)
50 ohm load
Min.
480
(V
CC
=V
OSC
=3.3V, Ta=25°C)
Typ.
Max.
Unit
622
640
±120
4.5
-
55
16
MHz
ppm
dBm
dBc
%
ps rms
R1
Co
C1
sTEST
CIRCUIT & BLOCK DIAGRAM
V
CC
V
OSC
1
1nF
V
CC
XT1
X'tal
180nH XT2
OSC
Buffer
AMP
High
Pass
Filter
LIMITER
AMP
T2
13.6p
T1
5pF
12nH
V
VC
V
VC
1nF
GND
Output
Buffer
FOUT2
1000pF
1000pF
FOUT1
FOUT
1nF
1000pF
(Type: 033)
(Type: 1005)
Version 3.6 2003/08/22 ( 2 / 3 )
NJM2555
sTERMINAL
INFORMATION
No.
Symbol
2,
3,
XT1,
XT2,
Equivalent Circuit
Comment
and
4
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.
Version 3.6 2003/08/22 ( 3 / 3 )
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