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ADSP-21486KSWZ-2AB Datasheet(PDF) 25 Page - Analog Devices |
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ADSP-21486KSWZ-2AB Datasheet(HTML) 25 Page - Analog Devices |
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25 / 68 page  ADSP-21483/ADSP-21486/ADSP-21487/ADSP-21488/ADSP-21489 Rev. B | Page 25 of 68 | March 2013 Clock Signals The ADSP-2148x can use an external clock or a crystal. See the CLKIN pin description in Table 11 on Page 14. Programs can configure the processor to use its internal clock generator by connecting the necessary components to CLKIN and XTAL. Figure 7 shows the component connections used for a crystal operating in fundamental mode. Note that the clock rate is achieved using a 25 MHz crystal and a PLL multiplier ratio 16:1 (CCLK:CLKIN achieves a clock speed of 400 MHz). To achieve the full core clock rate, programs need to configure the multi- plier bits in the PMCTL register. Figure 7. Recommended Circuit for Fundamental Mode Crystal Operation C1 22pF Y1 R1 XTAL CLKIN C2 22pF 25MHz R2 47 TYPICAL VALUES ADSP-2148x CHOOSE C1 AND C2 BASED ON THE CRYSTAL Y1. R2 SHOULD BE CHOSEN TO LIMIT CRYSTAL DRIVE POWER. REFER TO CRYSTAL MANUFACTURER’S SPECIFICATIONS. |
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