Vaishali Semiconductor VT73227
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.APPLICATIONS
●=●= Set-top boxes Telecom switching
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●= Oscillator replacement MPEG Video clock source
GENERAL DESCRIPTION
The Vaishali A 0 to 3.0V control signal is used to fine tune the output clock frequency in the ±100ppm range.FEATURES
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●= 3.3V operating voltage Uses inexpensive pullable crystal 12mA drive capability at TTL levels
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●= 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 3.3VDESCRIPTION
Crystal connection. Connect to a 27 MHz pullable crystal Voltage input to VCXO.