Peak Reducing EMI Solution

2 of 8

February 2008

ASM3P2180A

rev 1.2

Notice: The information in this document is subject to change without notice.

Pin Diagram

Pin Description

Pin#

Pin Name

Type

Description

1

CLKIN / XIN

I

Crystal connection or external reference clock input.

2

XOUT

O

Connection for an external crystal. If using an external reference, this pin must

be left unconnected.

3

GND

P

Ground to entire chip.

4

SS%

I

Spread Selection Input. Has an internal pull-up resistor.

5

CLKOUT

O

Modulated Clock Output.

6

VDD

P

Power supply for the entire chip.

7

FS

I

Frequency selection bit. This pin selects the frequency range of operation.

(Refer to the Frequency Range Selection Table). Has an internal pull-up

resistor.

8

NC

-

No connect.

Frequency Range Selection

FS

Frequency Range (MHz)

0

6 -10

1

18-30

Spread Selection table

Frequency (MHz)

SS%

FS=0

FS=1

Deviation (%) (typ)

6

18

-2

8

24

-1.5

0

10

30

-1

6

18

-4

8

24

-3

1

10

30

-2

1

2

3

4

5

6

7

8

VDD

NC

CLKOUT

CLKIN / XIN

XOUT

GND

SS%

FS

3P2180A