參數(shù)資料
型號： TMS320DM355_07
廠商： Texas Instruments, Inc.
英文描述： Digital Media System-on-Chip (DMSoC)
中文描述： 數(shù)字媒體系統(tǒng)芯片（DMSoC）
文件頁數(shù)： 100/158頁
文件大小： 1319K
代理商： TMS320DM355_07
www.ti.com
P
5.5.2
MXI2 (27-MHz) Oscillator (optional oscillator)
Crystal
27 MHz
C1
C2
MXI2
MXO2
V
SS_MX2
L1
V
DDA_PLL2
V
SSA_PLL2
0.1 F
1 F
C
L
C
1
C
2
(C
1
C
2
)
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
Table 5-3. Switching Characteristics Over Recommended Operating Conditions for 24-MHz System
Oscillator
PARAMETER
MIN
TYP
MAX
UNIT
ms
MHz
ppm
Start-up time (from power up until oscillating at stable frequency)
Oscillation frequency
ESR
Frequency stability
4
24 or 36
60
+/-50
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 (V
SS_MX2
).
Do not
connect to board ground (V
SS
). Also, the PLL
power pin (V
DDA_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 V
SS_MX2
pin.
Table 5-4. Switching Characteristics Over Recommended Operating Conditions for 27-MHz System
Oscillator
PARAMETER
MIN
TYP
MAX
UNIT
ms
MHz
ppm
Start-up time (from power up until oscillating at stable frequency)
Oscillation frequency
ESR
Frequency stability
4
27
60
+/-50
DM355 Peripheral Information and Electrical Specifications
100
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