VT73227-S1

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...