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FS6128-01

PLL Clock Generator IC with VCXO

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AMERICAN MICROSYSTEMS, INC.

FS6128-01

PLL Clock Generator IC with VCXO

April 2000

1.0 Features

• Phase-locked loop (PLL) device synthesizes output

clock frequency from crystal oscillator or external ref-

erence clock

• On-chip tunable voltage-controlled crystal oscillator

(VCXO) allows precise system frequency tuning

• Typically used for generation of MPEG-2 decoder

clock

• 3.3V supply voltage

• 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

2.0 Description

The FS6128 is a monolithic CMOS clock generator IC

designed to minimize cost and component count in digital

video/audio systems.

At the core of the FS6128 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 an output

clock (CLK) through a post-divider. The CLK frequency is

ratiometrically derived from the VCXO frequency. The

locking of the CLK frequency to other system reference

frequencies can eliminate unpredictable artifacts in video

systems and reduce electromagnetic interference (EMI)

due to frequency harmonic stacking.

XIN 1

VDD 2

XTUNE 3

VSS 4

8 XOUT

7 VSS

6 n/c

5 CLK

Table 1: Crystal / Output Frequencies

DEVICE

fXIN (MHz)

CLK (MHz)

FS6128-01

13.5

27

NOTE: Contact AMI for custom PLL frequencies

XTUNE Range

0-2 V

8-pin (0.150″ ) SOIC

Figure 2: Block Diagram

XIN

XOUT

XTUNE

VCXO

ISO9001

PLL

DIVIDER

CLK

FS6128

4.24.00

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