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PDF ICS728 Data sheet ( Hoja de datos )

Número de pieza ICS728
Descripción LOW COST 27 MHZ 3.3 VOLT VCXO
Fabricantes Integrated Circuit Systems 
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ICS728
LOW COST 27 MHZ 3.3 VOLT VCXO
Description
The ICS728 combines the functions of a VCXO
(Voltage Controlled Crystal Oscillator) and PLL (Phase
Locked Loop) frequency doubler onto a single chip.
Used in conjunction with an external pullable quartz
crystal, this monolithic integrated circuit replaces more
costly hybrid (canned) VCXO devices. The ICS728 is
designed primarily for data and clock recovery
applications within end products such as set-top box
receivers.
The ICS728 exhibits a moderate VCXO gain of 110
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
Ideal for set-top box applications using 13.5 MHz
external pullable crystal to generate lock 27 MHz
clock transport video clock
On-chip VCXO with guaranteed pull range of ±110
ppm minimum
VCXO input tuning voltage 0 to 3.3 V
Packaged in 8-pin SOIC (150 mil wide)
Available in Pb (lead) free package
Block Diagram
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DataShee
VIN
13.5 MHz
Pullable
Crystal
X1
X2
Voltage
Controlled
Crystal
Oscillator
PLL
Frequency
Doubler
27 MHz
(2x Crystal Frequency)
MDS 728 B
1
Revision 012505
DataSheet4U.com
Integrated Circuit Systems l 525 Race Street, San Jose, CA 95126 l tel (408) 297-1201 l www.icst.com
DataSheet4 U .com

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ICS728 pdf
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ICS728
LOW COST 27 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
12
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
et4U.com
VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Output Frequency
Crystal Pullability
VCXO Gain
Output Rise Time
Output Fall Time
Output Clock Duty Cycle
Maximum Output Jitter,
short term
FO
FP 0V< VIN < 3.3 V, Note 1
+ 110
DaVtaINSh=eeVtD4UD./c2o+m1 V, Note 1
tOR 0.8 to 2.0 V, CL=15 pF
tOF 2.0 to 0.8 V, CL=15 pF
tD Measured at 1.4 V, CL=15 pF 40
tJ CL=15 pF
27
120
50
100
MHz
ppm
ppm/V
1.5 ns
1.5 ns
60 %
ps
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
DataShee
Thermal Characteristics
Parameter
Symbol Conditions
Thermal Resistance Junction to
Ambient
θJA Still air
θJA 1 m/s air flow
θJA 3 m/s air flow
Thermal Resistance Junction to Case θJC
Min.
Typ.
150
140
120
40
Max.
Units
°C/W
°C/W
°C/W
°C/W
MDS 728 B
5
Revision 012505
DataSheet4U.com
Integrated
Circuit
Systems
l
525
Race
Street,
San
Jose,
CA
95126
l
tel
(408)
297-1201
l
www.icst.com
DataSheet4 U .com

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