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TMS320DM6441 Datasheet(PDF) 97 Page - Texas Instruments |
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TMS320DM6441 Datasheet(HTML) 97 Page - Texas Instruments |
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97 / 229 page  www.ti.com 5.5 Oscillators 5.5.1 27-MHz System Oscillator MXI/CLKIN MXO C1 C2 Crystal MXVSS 27 MHz 1.8 V MXVDD RBIAS (optional) C L + C 1C2 (C 1 ) C2) TMS320DM6441 Digital Media System-on-Chip SPRS359B – SEPTEMBER 2006 – REVISED JANUARY 2007 DM6441 has two oscillator input/output pairs (MXI/MXO and M24XI/M24XO) usable with external crystals or ceramic resonators to provide clock inputs. The optimal frequencies for the crystals are 27 MHz (MXI/MXO) and 24 MHz (M24XI/M24XO). Optionally, the oscillator inputs are configurable for use with external oscillators. The 27-MHz oscillator provides the reference clock for all DM6441 subsystems and peripherals, with the exception of USB. The on-chip oscillator requires an external 27-MHz crystal connected across the MXI and MXO pins, along with two load capacitors, as shown in Figure 5-10. The external crystal load capacitors must be connected only to the 27-MHz oscillator ground pin (MXVSS). Do not connect to board ground (VSS). Figure 5-10. 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 MXVSS pin. Table 5-11. 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 of 27 MHz) Oscillation frequency 27 MHz ESR 60 Ω Frequency stability ±50 ppm Submit Documentation Feedback Peripheral and Electrical Specifications 97 |
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