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TDA4VEN...Q1 数据表(PDF) 118 Page - Texas Instruments |
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TDA4VEN...Q1 数据表(HTML) 118 Page - Texas Instruments |
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118 / 236 page  CL= C C f1 2 f (C +C ) f1 f2 J7ES_CL_MATH_03 Figure 6-22. Load Capacitance Equation The crystal must be in the fundamental mode of operation and parallel resonant. Table 6-25 summarizes the required electrical constraints. Table 6-25. WKUP_LFOSC0 Crystal Electrical Characteristics NAME DESCRIPTION MIN TYP MAX UNIT fp Parallel resonance crystal frequency 32768 Hz Crystal Frequency Stability and Tolerance ±100 PPM 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 Cshunt Shunt capacitance ESRxtal – 40 kΩ 4 pF ESRxtal – 60 kΩ 3 pF ESRxtal – 80 kΩ 2 pF ESRxtal – 100 kΩ 1 pF ESR Crystal effective series resistance (1) Ω (1) The maximum ESR of the crystal is a function of the crystal frequency and shunt capacitance. See the Cshunt parameter. 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 6-26 details the switching characteristics of the oscillator and the requirements of the input clock. Table 6-26. WKUP_LFOSC0 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT fxtal Oscillation frequency 32768 Hz tsX Start-up time 96.5 ms VDDS_OSC0 WKUP_LFOSC0_XO t sX Time VSS VDDS_OSC0 (min.) VDD_CORE (min.) VSS VDD_CORE LFXOSC_STARTUP_02 Figure 6-23. WKUP_LFOSC0 Start-up Time TDA4VEN-Q1, TDA4AEN-Q1 SPRSP96A – MARCH 2024 – REVISED SEPTEMBER 2024 www.ti.com 118 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated Product Folder Links: TDA4VEN-Q1 TDA4AEN-Q1 |
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