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TMS320DM355 Datasheet(PDF) 99 Page - Texas Instruments |
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TMS320DM355 Datasheet(HTML) 99 Page - Texas Instruments |
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99 / 153 page  www.ti.com 5.5.2 MXI2 (27-MHz) Oscillator (optional oscillator) Crystal 27MHz C1 C2 MXI2 MXO2 VSS_MX2 L1 VDDA_PLL2 VSSA_PLL2 0.1 F 1 F C L C 1C2 (C 1 C 2) TMS320DM355 Digital Media System-on-Chip (DMSoC) SPRS463 – SEPTEMBER 2007 Table 5-3. Switching Characteristics Over Recommended Operating Conditions for 24-MHz System Oscillator PARAMETER MIN TYP MAX UNIT Start-up time (from power up until oscillating at stable frequency) 4 ms Oscillation frequency 24 or 36 MHz ESR 60 Ω Frequency stability +/-50 ppm The MXI2 (27 MHz) oscillator provides an optional reference clock for the 's VPSS module. The on-chip oscillator requires an external 27-MHz crystal connected across the MXI2 and MXO2 pins, along with two load capacitors, as shown in Figure 5-6. The external crystal load capacitors must be connected only to the 27-MHz oscillator ground pin (VSS_MX2). Do not connect to board ground (VSS). Also, the PLL power pin (VDDA_PLL2) should be connected to the power supply through a ferrite bead, L1 in the example circuit shown in Figure 5-6. Figure 5-6. MXI2 (27-MHz) System Oscillator The load capacitors, C1 and C2, should be chosen such that the equation is satisfied (typical values are C1 = C2 = 10 pF). 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 pins (MXI and MXO) and to the VSS_MX2 pin. Table 5-4. Switching Characteristics Over Recommended Operating Conditions for 27-MHz System Oscillator PARAMETER MIN TYP MAX UNIT Start-up time (from power up until oscillating at stable frequency) 4 ms Oscillation frequency 27 MHz ESR 60 Ω Frequency stability +/-50 ppm Submit Documentation Feedback Peripheral Information and Electrical Specifications 99 |
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