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P701-0XXC Datasheet(PDF) 2 Page - PhaseLink Corporation |
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P701-0XXC Datasheet(HTML) 2 Page - PhaseLink Corporation |
2 / 5 page PLL701-01/02/04/06 Low EMI Spread Spectrum Multiplier Clock 47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991 www.phaselink.com Rev 08/12/04 Page 2 BLOCK DIAGRAM PIN DESCRIPTIONS Name Number Type Description XIN/FIN 1 I Crystal input to be connected to fundamental parallel mode crystal.(CL=18pF) or clock input. XOUT/SD 2 B At power-up, this pin is an input pin to select modulation type. After input sampling, this pin is crystal output. Has internal pull up resistor. SC0 3 I Digital control input to select modulation magnitude. Has internal pull-up. SC1 4 I Digital control input to select modulation magnitude. Has internal pull-up. GND 5 P Ground. FOUT 6 O Modulated Clock Frequency Output. The frequency before modulation is synthesized by multiplying the input frequency by 1X, 2X, 4X, 6X depending on the part number (PLL701-01, -02, -04, -06). SC2 7 I Digital control input to select modulation magnitude. Has internal pull-up. VDD 8 P Power Supply. FUNCTIONAL DESCRIPTION Selectable spread spectrum and modulation magnitudes The PLL701-01/02/04/06 provides selectable spread spectrum modulation type, as well as selectable modulation magnitude. Selection is made by connecting specific pins to a logical “zero” or “one” according to the output clock selection table on page 1. In order to reduce the number of pins on the chip, the PLL701-01/02/04/06 uses pin 2 (XOUT/SD) as a bi- directional pin. The pin serves as modulation type selector input (SD) upon power-up (see output clock selection table on page 1), and as XOUT crystal connection as soon as the input has been latched. Pins 3 (SC0), 4 (SC1), and 7 (SC2) are used as inputs to select the spread spectrum modulation magnitude as shown on the output clock selection table (page 1). XTAL OSC FOUT XIN/FIN XOUT SC(0:2) PLL SST Control Logic |
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