XT

February 1999

This document contains information on a product under development. American Microsystems, Inc. reserves the right to change or discontinue this product without notice.

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1.0

Features

•

On-board crystal oscillator

•

Phase-locked loop (PLL) synthesizes desired CLK

frequency

•

Internal loop filter

•

Internal crystal oscillator load capacitance (16pF

nominal)

•

Only external components required are decoupling

capacitors

•

Minimal board footprint (8-pin 0.150" SOIC package)

2.0

Description

The FS6118 is a monolithic CMOS frequency synthesizer

IC designed for cost sensitive or space limited applica-

tions.

An on-board crystal oscillator accepts a quartz crystal

and provides a different, synthesized frequency on the

CLK output. The device is packaged in an 8-pin SOIC

package for a minimal board footprint.

Custom factory-programmed clock frequencies are avail-

able. Please contact your local AMI sales representative

for more information.

Figure 1: Block Diagram

XIN

FS6118

CLK

Crystal

Oscillator

Phase-

Locked Loop

XOUT

Figure 2: Pin Configuration

1

8

2

3

4

7

6

5

VSS

XOUT

XIN

VDD

CLK

VSS

n/c

VDD

8-pin 0.150" SOIC

Table 1: Pin Descriptions

Key: AI = Analog Input; AO = Analog Output; DI = Digital Input; DI

DO = Digital Output; P = Power/Ground; # = Active Low pin

PIN

TYPE

NAME

DESCRIPTION

1

P

VSS

Ground

2

AO

XOUT

Crystal oscillator feedback

3

AI

XIN

Crystal oscillator drive

4

P

VDD

Power supply (+5V)

5

--

N/C

No Connection

6

P

VSS

Ground

7

DO

CLK

Clock Output

8

P

VDD

Power Supply (+5V)

Table 2: Font Description

DEVICE

CRYSTAL FREQUENCY

(MHz)

CLK FREQUENCY

(MHz)

FS6118-01

14.31818

40.0000

Custom frequencies available – contact AMI for more information