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AM3892 Datasheet(PDF) 133 Page - Texas Instruments |
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AM3892 Datasheet(HTML) 133 Page - Texas Instruments |
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133 / 299 page ![]() DEV_MXI/ DEV_CLKIN DEV_MXO C1 C2 Crystal 27 MHz DEVOSC_VSS 1.8 V DEVOSC_DVDD18 DEVOSC_VSS R (Optional) d ) C (C C C 2 1 2 1 L C + = AM3894 AM3892 www.ti.com SPRS681A – OCTOBER 2010 – REVISED MARCH 2011 Figure 7-5. 27-MHz System Oscillator The load capacitors, C1 and C2 in Figure 7-5, should be chosen such that the equation below is satisfied. CL in the equation is the load specified by the crystal manufacturer. Rd is an optional damping resistor. All discrete components used to implement the oscillator circuit should be placed as close as possible to the associated oscillator MXI, MXO, and VSS pins. Table 7-5. Input Requirements for Crystal Circuit on the Device Oscillator PARAMETER MIN NOM MAX UNIT Start-up time (from power up until oscillating at stable frequency of 27 MHz) 4 ms Crystal Oscillation frequency 27 MHz Parallel Load Capacitance (C1 and C2) 12 24 pF Crystal ESR 60 Ohm Crystal Shunt Capacitance 5 pF Crystal Oscillation Mode Fundamental Only Crystal Frequency stability ±50 ppm Copyright © 2010–2011, Texas Instruments Incorporated Power, Reset, Clocking, and Interrupts 133 Submit Documentation Feedback Product Folder Link(s): AM3894 AM3892 |
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