VCXO (Voltage-Controlled Crystal Oscillator) 27 MHz 3.3V
VT73227 VCXO (Voltage-Controlled Crystal Oscillator) 27 MHz 3.3V
Applications
•= •= Set-top boxes Telecom switching •= •...
Description
VT73227 VCXO (Voltage-Controlled Crystal Oscillator) 27 MHz 3.3V
Applications
= = Set-top boxes Telecom switching = = Oscillator replacement MPEG Video clock source
General Description
The Vaishali VT73227 is a single-chip, low-jitter Voltage-Controlled-Crystal-Oscillator. The device accepts a 27 MHz, 20 pF (pull range of 200 ppm) crystal input, and produces a low jitter output at the same frequency. A 0 to 3.0V control signal is used to fine tune the output clock frequency in the ±100ppm range.
Features
= = = 3.3V operating voltage Uses inexpensive pullable crystal 12mA drive capability at TTL levels = = On-chip oscillator with 200 ppm pull range (±100 ppm) 8 pin SOIC package
Figure 1. Functional Block Diagram
VDD1
VDD2
VIN X2 27 MHz Pullable Crystal
Load Cap Control
Output Buffer Load Caps Oscillator
CLK1
X1
GND1
GND2
2001-04-02 Vaishali Semiconductor 1300 White Oaks Road, Ste. 200
Page 1 Campbell CA 95008 Ph. 408.377.6060
MDST-0006-03 Fax 408.377.6063
VT73227
Figure 2. Pin Configuration X1 VDD1 VIN GND2 1 2 3 4
VT73227 8 7 6 5 X2 GND1 VDD2 CLK
8 pin (150 mil) SOIC Table 1. Pin Description Name
X1 VDD1 VIN GND2 CLK VDD2 GND1 X2 1 2 3 4 5 6 7 8
Pin #
Type
Xi P I P O P P Xi Core VDD. Connect to 3.3V
Description
Crystal connection. Connect to a 27 MHz pullable crystal
Voltage input to VCXO. Zero to 3.3V signal controls the frequency of the VCXO. Connect to ground. Clock output Pad driver VDD . Connect to 3.3V Connect to ground. Crystal connectio...
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