XT

February 1999

This document contains information on a new product. Specifications and information herein are subject to change without notice.

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1.0

Features

•

On-chip tunable voltage-controlled crystal oscillator

circuitry (VCXO) allows precise system frequency

tuning (pull range typically 300ppm)

•

VCXO tuning range: 0-3V

•

Uses inexpensive fundamental-mode crystals

•

Integrated phase-locked loop (PLL) multiplies VCXO

frequency to the higher system frequencies needed

•

5V supply voltage (contact factory for 3.3V)

•

Small circuit board footprint (8-pin 0.150

″ SOIC)

•

Custom frequency selections available - contact your

local AMI Sales Representative for more information

Figure 1: Pin Configuration

1

8

2

3

4

7

6

5

XIN

VDD

XTUNE

VSS

VSS

VDD

CLK

XOUT

8-pin (0.150

″) SOIC

2.0

Description

The FS6127 is a monolithic CMOS clock generator IC

designed to minimize cost and component count in digital

video/audio systems.

At the core of the FS6127 is circuitry that implements a

voltage-controlled crystal oscillator when an external

resonator (nominally 13.5MHz) is attached. The VCXO

allows device frequencies to be precisely adjusted for use

in systems that have frequency matching requirements,

such as digital satellite receivers.

A high-resolution phase-locked loop generates the output

clock frequency (CLK). The CLK frequency is phase-

locked and frequency-locked to the VCXO frequency.

Table 1: Crystal / Output Frequencies

DEVICE

CLK (MHz)

FS6127-01

13.5

27

NOTE: Contact AMI for custom PLL frequencies and 3.3 volt versions

Figure 2: Block Diagram

VCXO

FS6127

PLL

XOUT

XIN

CLK

XTUNE