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): 99/158頁
文件大?。?/td> 1319K
代理商: TMS320DM355_07
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5.5 Oscillators and Clocks
5.5.1
MXI1 (24-MHz) Oscillator
Crystal
24 MHz or
36 MHz
C1
C2
MXI1/CLKIN
MXO1
V
SS_MX1
0.1 F
1 F
L1
V
DDA_PLL1
V
SSA_PLL1
C
L
C
1
C
2
(C
1
C
2
)
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
DM355 has two oscillator input/output pairs (MXI1/MXO1 and MXI2/MXO2) usable with external crystals
or ceramic resonators to provide clock inputs. The optimal frequencies for the crystals are 24 MHz
(MXI1/MXO1) and 27 MHz (MXI2/MXO2). Optionally, the oscillator inputs are configurable for use with
external clock oscillators. If external clock oscillators are used, to minimize the clock jitter, a single clean
power supply should power both the DM355 and the external oscillator circuit and the minimum CLKIN
rise and fall times must be observed. The electrical requirements and characteristics are described in this
section.
The timing parameters for CLKOUT[3:1] are also described in this section. The DM355 has three output
clock pins (CLKOUT[3:1]). See
Section 3.5
and
Section 3.6
for more information on CLKOUT[3:1].
The MXI1 (typically 24 MHz, can also be 36 MHz) oscillator provides the primary reference clock for the
DM355 device. The on-chip oscillator requires an external crystal connected across the MXI1 and MXO1
pins, along with two load capacitors, as shown in
Figure 5-5
. The external crystal load capacitors
must
be
connected only to the oscillator ground pin (V
SS_MX1
).
Do not
connect to board ground (V
SS
). Also, the PLL
power pin (V
DDA_PLL1
) should be connected to the power supply through a ferrite bead, L1 in the example
circuit shown in
Figure 5-5
.
Figure 5-5. MXI1 (24-MHz) 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 (MXI1 and MXO1) and to the V
SS_MX1
pin.
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DM355 Peripheral Information and Electrical Specifications
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