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AM6548ACD 数据表(PDF) 154 Page - Texas Instruments |
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AM6548ACD 数据表(HTML) 154 Page - Texas Instruments |
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154 / 284 page  Table 7-14. WKUP_OSC0 Crystal Electrical Characteristics NAME DESCRIPTION MIN TYP MAX UNIT fp Parallel resonance crystal frequency 19.2, 20, 24, 25, 26, 27 MHz Cf1 Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2 12 24 pF Cf2 Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2 12 24 pF ESR(Cf1,Cf2) Crystal ESR 100 Ω CO Crystal shunt capacitance ESR = 30 Ω ESR = 40 Ω 19.2 MHz, 20 MHz, 24 MHz, 25 MHz, 26 MHz, 27 MHz 7 pF ESR = 50 Ω 19.2 MHz, 20 MHz 7 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz 5 pF ESR = 60 Ω 19.2 MHz, 20 MHz 7 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz Not Supported - ESR = 80 Ω 19.2 MHz, 20 MHz 5 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz Not Supported - ESR = 100 Ω 19.2 MHz, 20 MHz 3 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz Not Supported - LM Crystal motional inductance for fp = 20 MHz 10.16 mH CM Crystal motional capacitance 3.42 fF fj(WKUP_OSC0_XI) Frequency accuracy, WKUP_OSC0_XI Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 When selecting a crystal, the system design must consider the temperature and aging characteristics of a based on the worst case environment and expected life expectancy of the system. Table 7-15 details the switching characteristics of the oscillator and the requirements of the input clock. Table 7-15. WKUP_OSC0 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT fp Oscillation frequency 19.2, 20, 24, 25, 26, 27 MHz tsX Start-up time 2 (1) ms (1) In order to meet the start-up time defined in this table, the crystal needs to be selected according to the following equation: Tsu = K×Lm/ (Ro-ESR) + Δt where Lm is crystal motional inductance, RO is the negative resistance of amplifier, ESR is the crystal Effective series resistance and K is a constant which represents the initial conditions. Δt is the time amplifier takes to reach its bias point after power down is released. AM6548, AM6528, AM6546, AM6526 SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021 www.ti.com 154 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AM6548 AM6528 AM6546 AM6526 |
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