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AM625 Datasheet(PDF) 111 Page - Texas Instruments |
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AM625 Datasheet(HTML) 111 Page - Texas Instruments |
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111 / 235 page  Device MCU_OSC0_XO MCU_OSC0_XI C L1 Crystal C L2 AM65x_MCU_OSC_INT_01 PCB Ground Figure 7-16. MCU_OSC0 Crystal Implementation The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-17 summarizes the required electrical constraints. Table 7-17. MCU_OSC0 Crystal Circuit Requirements PARAMETER MIN TYP MAX UNIT Fxtal Crystal Parallel Resonance Frequency 24, 25, 26 MHz Fxtal Crystal Frequency Stability and Tolerance Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 CL1+PCBXI Capacitance of CL1 + CPCBXI 12 24 pF CL2+PCBXO Capacitance of CL2 + CPCBXO 12 24 pF CL Crystal Load Capacitance 6 12 pF Cshunt Crystal Circuit Shunt Capacitance ESRxtal = 30 Ω 24, 25, 26 MHz 7 pF ESRxtal = 40 Ω 24, 25, 26 MHz 5 pF ESRxtal = 50 Ω 24, 25, 26 MHz 5 pF ESRxtal = 60 Ω 24 MHz 5 pF ESRxtal = 80 Ω 24 MHz 3 pF ESRxtal Crystal Effective Series Resistance 80 Ω When selecting a crystal, the system design must consider temperature and aging characteristics of the crystal based on worst case environment and expected life expectancy of the system. Table 7-18 details the switching characteristics of the oscillator. Table 7-18. MCU_OSC0 Switching Characteristics - Crystal Mode PARAMETER PACKAGE MIN TYP MAX UNIT CXI XI Capacitance ALW 0.812 pF AMC 1.635 pF CXO XO Capacitance ALW 0.83 pF AMC 1.72 pF CXIXO XI to XO Mutual Capacitance ALW 0.0114 pF AMC 0.267 pF www.ti.com AM625, AM623 SPRSP58 – JUNE 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 111 Product Folder Links: AM625 AM623 |
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