Preliminary

PLL701-21

Low EMI Spread Spectrum Multiplier Clock

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991

www.phaselink.com

Rev 05/12/05 Page 1

FEATURES

• Spread Spectrum Clock Generator with selectable

SST mode.

• Output frequency ranges: 24MHz to 200MHz.

• Selectable Center Spread Modulation.

• TTL/CMOS compatible outputs.

• 3.3V Operating Voltage.

• Low short-term jitter.

• Available in 8-Pin 150mil SOIC.

DESCRIPTION

The PLL701-21 is a Spread Spectrum Clock

Generator designed for the purpose of reducing EMI

in high-speed digital systems, with selectable Center

Spread modulation magnitude (see table below). The

device operates over a very wide range of input

frequencies and provides a 1x modulated clock

output.

PIN CONFIGURATION

Note: v: 30k

Ω Internal Pull down. ^: 30kΩ Internal Pull up.

SST BY-PASS SELECTOR

S3

Spread Spectrum Mode

0

OFF

1

ON (See below) Default

Note: S3 has an internal Pull Up. Default=”1”

MODULATION MAGNITUDE SELECTION

Spread Spectrum Modulation

S2

S1

S0

FIN Range

(MHz)

FOUT

Frequency

Magnitude

0

0

0

24 - 200

X1

±0.75%

0

0

1

24 - 200

X1

±1.00%

0

1

0

24 - 200

X1

±1.25%

0

1

1

24 - 200

X1

±0.125%

1

0

0

24 - 200

X1

±0.25%

1

0

1

24 - 200

X1

±0.50%

1

1

0

24 - 200

X1

±0.375%

1

1

1

24 - 200

X1

Fin / 1024

±0.625%

1

2

3

45

6

7

8

FIN

S2^

S1^

VDD

FOUT

GND

S3^

FIN = 24 ~ 200 Mhz