参数资料
型号: ICS728M
厂商: INTEGRATED DEVICE TECHNOLOGY INC
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: 1/9页
文件大小: 187K
代理商: ICS728M
DATASHEET
LOW COST 27 MHZ 3.3 VOLT VCXO
ICS728
IDT / ICS LOW COST 27 MHZ 3.3 VOLT VCXO
1
ICS728
REV B 012505
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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