PLL701-17

Low EMI Spread Spectrum Multiplier Clock

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

www.phaselink.com

Rev 01/17/06 Page 4

FUNCTIONAL DESCRIPTION

Selectable spread spectrum and modulation frequency and magnitude

The PLL701-17 provides selectable spread spectrum modulation frequency, as well as selectable modulation

magnitude. Selection is made by connecting pins 2 (S2), 3 (S1), 4 (S0), and 7 (S3) to a logical “zero” or “one”,

according to the output clock selection table on (page 1).

Default values for S(0:3) through internal pull-up and pull-down resistor

Selection pins 4 and 7 (S0 and S3) have an internal pull-down resistor of 30k

Ω while pins 2 and 3 (S1 and S2)

have an internal pull-up resistor of 30k

Ω. This internal pull-down (or pull-up) resistor will pull the input value to a

logical “zero” (or “one” respectively) by default, i.e. when no connection is made between the pin and VDD (GND

respectively). In order to override the internal pull-down (pull-up), the pin has to be connected to VDD (GND

respectively).