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AM3359 Datasheet(PDF) 97 Page - Texas Instruments |
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AM3359 Datasheet(HTML) 97 Page - Texas Instruments |
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97 / 195 page  AM335x XTALIN VSS_OSC XTALOUT C 1 C 2 Optional R bias Optional R d Crystal AM3359, AM3358, AM3357 AM3356, AM3354, AM3352 www.ti.com SPRS717B – OCTOBER 2011 – REVISED JANUARY 2012 A. Oscillator components (Crystal, C1, C2, optional Rbias and Rd) must be located close to the AM335x package. Parasitic capacitance to the printed circuit board (PCB) ground and other signals should be minimized to reduce noise coupled into the oscillator. The VSS_OSC terminal provides a Kelvin ground reference for the external crystal components. External crystal component grounds should only be connected to the VSS_OSC terminal and should not be connected to the PCB ground plane. B. C1 and C2 represent the total capacitance of the respective PCB trace, load capacitor, and other components (excluding the crystal) connected to each crystal terminal. The value of capacitors C1 and C2 should be selected to provide the total load capacitance, CL, specified by the crystal manufacturer. The total load capacitance is CL = [(C1*C2)/(C1+C2)] + Cshunt, where Cshunt is the crystal shunt capacitance (C0) specified by the crystal manufacturer plus any mutual capacitance (Cpkg + CPCB) seen across the AM335x XTALIN and XTALOUT signals. For recommended values of crystal circuit components, see Table 4-1. Figure 4-6. OSC0 Crystal Circuit Schematic Table 4-1. OSC0 Crystal Circuit Requirements NAME DESCRIPTION MIN TYP MAX UNIT fxtal Crystal parallel resonance Fundamental mode oscillation only 19.2, 24.0, MHz frequency 25.0, or 26.0 Crystal frequency -50.0 50.0 ppm stability/tolerance CC1 C1 capacitance 12.0 24.0 pF CC2 C2 capacitance 12.0 24.0 pF Cshunt Shunt capacitance 5.0 pF ESR Crystal effective series fxtal = 19.2 MHz, oscillator has nominal 54.4 Ω resistance negative resistance of 272 Ω and worst-case negative resistance of 163 Ω fxtal = 24.0 MHz, oscillator has nominal 48.0 Ω negative resistance of 240 Ω and worst-case negative resistance of 144 Ω fxtal = 25.0 MHz, oscillator has nominal 46.6 Ω negative resistance of 233 Ω and worst-case negative resistance of 140 Ω fxtal = 26.0 MHz, oscillator has nominal 45.3 Ω negative resistance of 227 Ω and worst-case negative resistance of 137 Ω Copyright © 2011–2012, Texas Instruments Incorporated Power and Clocking 97 Submit Documentation Feedback Product Folder Link(s): AM3359 AM3358 AM3357 AM3356 AM3354 AM3352 |
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