VT83027
27MHz, 3.3V VCXO
(Voltage-Controlled Crystal Oscillator)
Applications
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Set-top boxes
Telecom switching
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HDTV
MPEG Video clock source
General Description
The Vaishali VT83027 is a single-chip, integrated VCXO and Phase Locked Loop (PLL) clock synthesizer.
The device uses the VCXO and an analog Phase-Locked Loop (PLL) to accept a 13.5 MHz, 14 pF (pull
range of 200 ppm) crystal input, and produce a 27 MHz output. A 0 to 3V control signal is used to fine tune
the output clock frequency in the 卤100ppm range.
Features
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3.3V supply operation
Low jitter PLL Clock Synthesizer
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Zero ppm synthesis error
Uses inexpensive pullable crystal
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卤
12mA drive capability
On-chip oscillator with 200 ppm pull
range (卤100 ppm)
8 pin SOIC package
Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
VDD1
VDD2
VT83027
VIN
X2
13.5 MHz
Pullable
Crystal
Load Cap
Control
Low
Phase
osc Noise
PLL
X1
VDD1
Output
Buffer
CLK1
1
2
3
4
8
7
6
5
X2
GND1
VDD2
CLK
Load
Caps
VIN
GND2
8 pin (150 mil) SOIC
X1
GND1
GND2
2001-04-17
Vaishali Semiconductor
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www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDST-0003-03
Ph. 408.377.6060
Fax 408.377.6063
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