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TMS320VC5502 Datasheet(PDF) 131 Page - Texas Instruments |
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TMS320VC5502 Datasheet(HTML) 131 Page - Texas Instruments |
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131 / 189 page  www.ti.com 5.6.2 Layout Considerations TMS320VC5502 Fixed-Point Digital Signal Processor SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004 The recommended ESR is presented as a maximum, and theoretically, a crystal with a lower maximum ESR might seem to meet these specifications. However, it is recommended that crystals with actual maximum ESR specifications as shown in Table 5-1 be used since this will result in maximum crystal performance reliability. Since parasitic capacitance, inductance, and resistance can be significant in this and any circuit, good PC board layout practices should always be observed when planning trace routing to the discrete components used in this oscillator circuit. Specifically, the crystal and the associated discrete components should be located as close to the DSP as physically possible. Also, X1 and X2/CLKIN traces should be separated as soon as possible after routing away from the DSP to minimize parasitic capacitance between them, and a ground trace should be run between these two signal lines. This also helps to minimize stray capacitance between these two signals. Specifications 131 |
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