2001-04-02

Page

1

MDST-0006-03

Vaishali Semiconductor

1300 White Oaks Road, Ste. 200

Campbell

CA 95008

Ph. 408.377.6060

Fax 408.377.6063

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

VT73227

VCXO

(Voltage-Controlled Crystal Oscillator)

27 MHz 3.3V

Figure 1. Functional Block Diagram

CLK1

VDD2

X2

Load Cap Control

Output

Buffer

Load

Caps

VDD1

27 MHz

Pullable

Crystal

VIN

X1

GND1

GND2

Oscillator