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X1CLKIN Arkusz danych(PDF) 2 Page - Pericom Semiconductor Corporation |
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X1CLKIN Arkusz danych(HTML) 2 Page - Pericom Semiconductor Corporation |
2 / 9 page 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 Fin /640 24 - ±0.30 ±0.50 ±0.70 0 Fin /640 27 - ±0.30 ±0.50 ±0.70 0 Fin /640 32 - ±0.25 ±0.40 ±0.60 0 Fin /640 36 - ±0.20 ±0.35 ±0.55 0 Fin /640 40 - ±0.20 ±0.35 ±0.50 0 Fin /640 |
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