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TMS320DM355CZCEA13 데이터시트(PDF) 107 Page - Texas Instruments

부품명 TMS320DM355CZCEA13
상세설명  Digital Media System-on-Chip (DMSoC)
PDF  163 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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TMS320DM355CZCEA13 데이터시트(HTML) 107 Page - Texas Instruments

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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
www.ti.com
SPRS463G – SEPTEMBER 2007 – REVISED JUNE 2010
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
5.5.2
MXI2 (27-MHz) Oscillator (optional oscillator)
The MXI2 (27 MHz) oscillator provides an optional reference clock for the DM355'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
Copyright © 2007–2010, Texas Instruments Incorporated
DM355 Peripheral Information and Electrical Specifications
107
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Product Folder Link(s): TMS320DM355



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