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FS6128-07

PLL Clock Generator IC with VCXO

AMI Semiconductor 

AMERICAN MICROSYSTEMS, INC.

FS6128-07

PLL Clock Generator IC with VCXO

August 2000

1.0 Features

• Matches MK3727 center frequency characteristics

• 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

• 3.3V supply voltage

• Very low phase noise PLL

• Use with “pullable” 14pF crystals – no external pad-

ding capacitors required

• Small circuit board footprint (8-pin 0.150″ SOIC)

• Custom frequency selections available - contact your

local AMI Sales Representative for more information

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 (VCXO) when an ex-

ternal resonator (nominally 13.5MHz) is attached. The

VCXO allows device frequencies to be precisely adjusted

for use in systems that have frequency matching re-

quirements, 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.

Figure 1: Pin Configuration

XIN 1

VDD 2

XTUNE 3

VSS 4

8 XOUT

7 VSS

6 VDD

5 CLK

8-pin (0.150″) SOIC

Table 1: Crystal / Output Frequencies

DEVICE

fXIN (MHz)

FS6128-07

13.500

NOTE: Contact AMI for custom PLL frequencies

CLK (MHz)

27.000

Figure 2: Block Diagram

XIN

XOUT

XTUNE

VCXO

PLL

DIVIDER

CLK

FS6128-07

American Microsystems, Inc. reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.

ISO9001

8.8.00

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