2

PI6C3622-1

Low Power Spread Spectrum Frequency Multiplier

SSCG-GP Family

PS8944A

01/30/08

Pin Description

Pin Name

Pin No.

IO Type

Description

X1/CLKIN

1

I

Crystal connection or reference frequency input. This pin

has multiple functions. It can be connected either to an

external crystal or an external reference clock.

GND

2

GND

Ground.

S1

3

I

Spreading Ratio Selection (0, 1); Default = 1; Internal

60K Ω pull–up included.

SSON

4

I

This pin enables/disables the Spread Spectrum feature;

Default= 1 (enabled); Internal 60KΩ pull-up included

CLKOUT

5

O

Spread spectrum clock output.

S0

6

I

Frequecy Range Selection (0, 1); Default = 0; Internal

60K Ω pull-DOWN included

VDD

7

PWR

Power Supply

X2

8

O

Crystal connection. If using an external reference, this pin

must be left unconnected.

Note: All pins must be properly set before the system is initialized, except the SSON pin, which can be set at run-time.

Spreading Ratio Configuration

VDD = 2.5V ±5% / 3.3V ±10%, Ambient Temperature 25°C

Fin (MHz) S1,S0 = (0,0)

SSON=1

S1,S0 = (0,1)

SSON=1

S1,S0 = (1,0)

SSON=1

S1,S0 = (1,1)

SSON=1

S1,S0 = 0/1

SSON=0

Modulation

Rate (KHz)

Reserved

Center (%)

Center (%)

Center

No Spread

31.25~62.5

20

-

±0.35

±0.55

±0.80

0

24

-

±0.30

±0.50

±0.70

0

27

-

±0.30

±0.50

±0.70

0

32

-

±0.25

±0.40

±0.60

0

36

-

±0.20

±0.35

±0.55

0

40

-

±0.20

±0.35

±0.50

0