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TDA2SA Datasheet(PDF) 182 Page - Texas Instruments |
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TDA2SA Datasheet(HTML) 182 Page - Texas Instruments |
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182 / 427 page  CL= C C f1 2 f (C +C ) 2 f1 f 182 TDA2SX, TDA2SG, TDA2SA TDA2HG, TDA2HV, TDA2HF, TDA2LF SPRS951F – DECEMBER 2015 – REVISED MAY 2019 www.ti.com Submit Documentation Feedback Product Folder Links: TDA2SX TDA2SG TDA2SA TDA2HG TDA2HV TDA2HF TDA2LF Clock Specifications Copyright © 2015–2019, Texas Instruments Incorporated NOTE The load capacitors, Cf1 and Cf2 in Figure 6-6, should be chosen such that the below equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All discrete components used to implement the oscillator circuit should be placed as close as possible to the associated oscillator xi_osc1, xo_osc1, and vssa_osc1 pins. Figure 6-7. Load Capacitance Equation The crystal must be in the fundamental mode of operation and parallel resonant. Table 6-5 summarizes the required electrical constraints. Table 6-5. OSC1 Crystal Electrical Characteristics NAME DESCRIPTION MIN TYP MAX UNIT fp Parallel resonance crystal frequency Range from 19.2 to 32 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 19.2 MHz ≤ fp ≤ 32 MHz 7 pF ESR = 40 Ω 19.2 MHz ≤ fp ≤ 32 MHz 5 pF ESR = 50 Ω 19.2 MHz ≤ fp ≤ 25 MHz 7 pF 25 MHz < fp ≤ 27 MHz 5 pF 27 MHz < fp ≤ 32 MHz Not Supported - ESR = 60 Ω 19.2 MHz ≤ fp ≤ 23 MHz 7 pF 23 MHz < fp ≤ 25 MHz 5 pF 25 MHz < fp ≤ 32 MHz Not Supported - ESR = 80 Ω 19.2 MHz ≤ fp ≤ 23 MHz 5 pF 23 MHz ≤ fp ≤ 25 MHz 3 pF 25 MHz < fp ≤ 32 MHz Not Supported - ESR = 100 Ω 19.2 MHz ≤ fp ≤ 20 MHz 3 pF 20 MHz < fp ≤ 32 MHz Not Supported - LM Crystal motional inductance for fp = 20 MHz 10.16 mH CM Crystal motional capacitance 3.42 fF tj(xiosc1) Frequency accuracy(1), xi_osc1 Ethernet and MLB not used ±200 ppm Ethernet RGMII and RMII using derived clock ±50 Ethernet MII using derived clock ±100 MLB using derived clock ±50 (1) Crystal characteristics should account for tolerance+stability+aging. When selecting a crystal, the system design must take into account the temperature and aging characteristics of a crystal versus the user environment and expected lifetime of the system. Table 6-6 details the switching characteristics of the oscillator and the requirements of the input clock. Table 6-6. Oscillator Switching Characteristics—Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT fp Oscillation frequency Range from 19.2 to 32 MHz |
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