NJM2555
622MHz VCXO IC
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General Description
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Package Outline
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
NJM2555C-C
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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Features
qOperating
Voltage:
+3.0V to +3.6V
qFrequency
range of Crystal:
155.52 MHz typ. (120 to 160 MHz)
qOutput
Frequency Range:622.08 MHz typ. (480 to 640 MHz)
qOutput
Level:
differential LVPECL equivalent
qA
Variable Capacitor on chip
qBipolar
Technology
qPackage:
Die
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Terminal Description & Coordinates
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
鹵20
[um]
Pad Size:
90x90 [um]
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Block Diagram
V
OSC
V
CC
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
錛?/div>
6
7
8
9
10
XT1
XT2
OSC
BUFFER
AMP
HIGH
PASS
FILTER
LIMITER
AMP
T2
T1
V
VC
F
OUT
2
GND
OUTPUT
BUFFER
F
OUT
1
Version 3.3
2002/09/26 (1/2)
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