T73227

T73227 27 MHz VCXO Clock Generator IC October 2002 1.0 Features 3.0 Description One-chip tunable voltage controlled crystal oscillator (VCXO) allows precise system frequency tuning 3.3V operation 8 pin SOIC and MSOP packages Uses inexpensive 20pF pullable crystals with no external capacitors required. 12mA drive capability at TTL levels The T73227 is a single-chip, low-jitter Voltage-ControlledCrystal-Oscillator. The device accepts a 27 MHz, 20 pF crystal, 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. This finds use in systems that have frequency matching requirements, such as digital satellite receivers. 2.0 Applications Set-top boxes MPEG Video clock source Oscillator replacement Figure 1: Block Diagram VDD1 VDD2 VIN Load Cap Control X2 27 MHz Pullable Crystal X1 Output Buffer Oscillator CLK Load Caps GND1 GND2 This document contains information on a preproduction product. Specifications and information herein are subject to change without notice. ISO9001 10.29.02 T73227 27 MHz VCXO Clock Generator IC October 2002 8-pin SOIC/MSOP X1 VDD1 VIN GND2 1 2 3 4 8 7 6 5 X2 GND1 VDD2 CLK Table 1: Pin Descriptions PIN TYPE NAME DESCRIPTION 1 2 3 4 5 6 7 8 Xi P I P O P P Xi X1 VDD1 VIN GND2 CLK VDD2 GND1 X2 Crystal Connection. Connect to a 27 MHz Pullable Crystal Core VDD. Connect to 3.3V Voltage input to VCXO. Zero to 3.3V Signal Control...