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參數(shù)資料
| 型號(hào)： | DSP56004FJ81 |
| 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(hào)處理 |
| 英文描述： | SYMPHONY AUDIO DSP FAMILY 24-BIT DIGITAL SIGNAL PROCESSORS |
| 中文描述： | Symphony音頻DSP系列的24位數(shù)字信號(hào)處理器 |
| 文件頁數(shù)： | 78/82頁 |
| 文件大小： | 636K |
| 代理商： | DSP56004FJ81 |
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4-4
DSP56004/D, Rev. 3
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Design Considerations
Power Consumption Considerations
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 formula:
Equation 3:
where:
C = node/ pin capacitance
V = voltage swing
f = 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:
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.
Disable unused pin activity.
Example 4-1
Current Consumption
For an I/ O pin loaded with 50 pF capacitance, operating at 5.5 V, and with a 81 MHz clock, toggling
at its maximum possible rate (20 MHz), the current consumption is:
Equation 4:
I
C
V
f
×
×
=
I
50
10
12
–
×
5.5
×
20
×
10
6
×
5.5mA
=
=
F
Freescale Semiconductor, Inc.
n
.
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| DSP56004ROM | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SYMPHONY AUDIO DSP FAMILY 24-BIT DIGITAL SIGNAL PROCESSORS |
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