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参数资料
| 型号： | ICS728MT |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 27 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封装： | 0.150 INCH, SOIC-8 |
| 文件页数： | 1/8页 |
| 文件大小： | 136K |
| 代理商： | ICS728MT |
ICS728
MDS 728 B
1
Revision 012505
Integr ated Circuit Sy stems l 5 25 Race Street, San Jose, CA 9 512 6 l tel (40 8 ) 2 97-12 01 l
www.icst.com
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
27 MHz
(2x Crystal Frequency)
X1
X2
Voltage
Controlled
Crystal
Oscillator
PLL
Frequency
Doubler
VIN
13.5 MHz
Pullable
Crystal
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