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PDF ICS3727XP Data sheet ( Hoja de datos )
| Número de pieza | ICS3727XP | |
| Descripción | LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO | |
| Fabricantes | ICST | |
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PRELIMINARY INFORMATION
ICS3727XP
LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO
Description
The ICS3727XP combines the functions of a VCXO
(Voltage Controlled Crystal Oscillator) and PLL
(Phase-Locked Loop) frequency doubler onto a single
chip. It is designed primarily for data and clock recovery
applications within end products such as set-top box
receivers.
The ICS3727XP exhibits a moderate VCXO gain of 200
ppm/V typical, when used with a high quality external
pullable quartz crystal.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Because
VIN is a high impedance input, it can be driven directly
from an PWM RC integrator circuit. Frequency output
increases with VIN voltage input. The usable range of
VIN is 0 to 3.3 V.
Features
• ICS3727XP offers 24 to 36 MHz output frequency
range (output frequency = 2x crystal frequency) and
improved power supply noise rejection
• Uses an inexpensive 12 to 18 MHz external crystal
• Ideal for DV CODEC applications using 27 MHz
external pullable crystal with extended pull range to
generate locked 27 MHz clock transport video clock
• On-chip VCXO with guaranteed pull range of ±200
ppm minimum
• VCXO input tuning voltage 0 to 3.3 V
• Packaged in 8-pin SOIC (150 mil wide)
Block Diagram
VIN
12-18 MHz
Pullable
Crystal
X1
X2
Voltage
Controlled
Crystal
Oscillator
PLL
Frequency
Doubler
24-36 MHz
(2x Crystal Frequency)
MDS 3727XP A
1
Revision 102004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
1 page  
PRELIMINARY INFORMATION
ICS3727XP
LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO
DC Electrical Characteristics
VDD=3.3 V ±5% , Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Symbol Conditions
Min. Typ.
Operating Voltage
VDD
3.15
Output High Voltage
Output Low Voltage
Output High Voltage (CMOS
Level)
VOH
VOL
VOH
IOH = -12 mA
IOL = 12 mA
IOH = -4 mA
2.4
VDD-0.4
Operating Supply Current
IDD Output = 27 MHz,
no load
10
Short Circuit Current
VIN, VCXO Control Voltage
IOS
VIA
±50
0
Max.
3.45
0.4
Units
V
V
V
V
mA
mA
3.3 V
AC Electrical Characteristics
VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Output Frequency
FO VCXO Crystal frequency =
1/2 Output
24
36 MHz
Crystal Pullability
VCXO Gain
FP 0V< VIN < 3.3 V, Note 1
+ 200
VIN = VDD/2 + 1 V, Note 1
200
ppm
ppm/V
Output Rise Time
Output Fall Time
Output Clock Duty Cycle
Maximum Output Jitter,
short term
tOR 0.8 to 2.0 V, CL=15 pF
1.5 ns
tOF 2.0 to 0.8 V, CL=15 pF
1.5 ns
tD Measured at 1.4 V, CL=15 pF 40 50 60 %
tJ CL=15 pF
100 ps
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
MDS 3727XP A
5
Revision 102004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet ICS3727XP.PDF ] | |
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