SM8761

SM8761 series Spread Spectrum Clock Generator OVERVIEW The SM8761 series are compact clock generator ICs that have a spread spectrum (SS) function to reduce undesirable EMI radiation. They have a built-in crystal oscillator circuit, PLL, and loop filter. They accept an input clock signal, generated using an external crystal or direct external clock input, and output an SS-modulated www.DataSheet4U.com clock signal. In addition, versions are available for center spread and down spread modulation mode, and all have a mode control pin to select the SS modulation function. FEATURES I I I Spread spectrum clock output to reduce EMI Correspond to wide range of output frequency Low jitter SM8761AA I I I Operating supply voltage: 3.3 ± 0.3V Multiplication: 1-time multiplication Package: 8-pin SOP SM8761AB Center spread ± 0.75% to ± 2.25% 12MHz to 32MHz 12MHz to 32MHz 12MHz to 32MHz 1-time multiplication 200ps (typ) @16MHz Spectrum modulation mode Spectrum modulation rate*1 Crystal element connection Input frequency External input clock Output frequency Multiplication Jitter (Cycle-to-Cycle) Down spread – 1.0% to – 3.8% 20MHz to 40MHz 20MHz to 108MHz 20MHz to 108MHz 1-time multiplication 200ps (typ) @33MHz 120ps (typ) @75MHz *1. The modulation rate that can be selected varies with the input frequency. PINOUT (Top view) PACKAGE DIMENSIONS (Unit: mm) + 0.1 0.15 − 0.05 XT VDD VSS CLKOUT 1 2 3 4 8 7 6 5 XTN MSEL1 MSEL0 0.695typ 6.2 ± 0.3 4.4 ± 0.2 TSTN 5.2 ± 0.3 0.05 ± 0....