參數(shù)資料
型號： DSP56364P
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
元件分類： 數(shù)字信號處理
英文描述： 24-Bit Audio Digital Signal Processor
中文描述： 24位音頻數(shù)字信號處理器
文件頁數(shù)： 81/148頁
文件大小： 1204K
代理商： DSP56364P
Power Consumption Considerations
DSP56364 Technical Data, Rev. 4
Freescale Semiconductor
5-3
All inputs must be terminated (i.e., not allowed to float) using CMOS levels, except for the three
pins with internal pull-up resistors (TMS, TDI, TCK).
Take special care to minimize noise levels on the V
CCP
and GND
P
pins.
If multiple DSP56364 devices are on the same board, check for cross-talk or excessive spikes on
the supplies due to synchronous operation of the devices.
RESET must be asserted when the chip is powered up. A stable EXTAL signal must be supplied
before deassertion of RESET.
At power-up, ensure that the voltage difference between the 5 V tolerant pins and the chip V
CC
never exceeds 3.95 V.
5.3
Power Consumption Considerations
Power dissipation is a key issue in portable DSP applications. Some of the factors which affect current
consumption are described in this section. Most of the current consumed by CMOS devices is alternating
current (ac), which is charging and discharging the capacitances of the pins and internal nodes.
Current consumption is described by the following formula:
where
C
V
f
= node/pin capacitance
= voltage swing
= frequency of node/pin toggle
The maximum internal current (I
CCI
max) value reflects the typical possible switching of the internal buses
on best-case operation conditions, which is not necessarily a real application case. The typical internal
current (I
CCItyp
) value reflects the average switching of the internal buses on typical operating conditions.
For applications that require very low current consumption, do the following:
Set the EBD bit when not accessing external memory.
Minimize external memory accesses and use internal memory accesses.
Minimize the number of pins that are switching.
Minimize the capacitive load on the pins.
Connect the unused inputs to pull-up or pull-down resistors.
Disable unused peripherals.
One way to evaluate power consumption is to use a current per MIPS measurement methodology to
minimize specific board effects (i.e., to compensate for measured board current not caused by the DSP).
Example 1. Current Consumption
For a Port A address pin loaded with 50 pF capacitance, operating at 3.3 V, and with a 100
MHz clock, toggling at its maximum possible rate (50 MHz), the current consumption is
I
C
V
×
f
×
=
I
50
10
12
–
×
3.3
×
50
10
6
×
×
8.25mA
=
=
相關(guān)PDF資料
PDF描述
DSP56366P 24-Bit Audio Digital Signal Processor
DSP56366UM 24-Bit Audio Digital Signal Processor
DSP56367P 24-Bit Audio Digital Signal Processor
DSP56367UM 24-Bit Audio Digital Signal Processor
DSP56600 Implementing Viterbi Decoders Using the VSL Instruction on DSP Families
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DSP56364UM 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DSP56364 24-Bit Digital Signal Processor User＇s Manual
DSP56366 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DSP56366 24-Bit Audio Digital Signal Processor
DSP56366P 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:24-Bit Audio Digital Signal Processor
DSP56366UM 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:24-Bit Audio Digital Signal Processor
DSP56367 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic
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