Symphony DSP56724/ DSP56725 Multi-Core Audio Processors, Rev. 2 Freescale Semico" />
參數(shù)資料
型號： DSPB56725AF
廠商： Freescale Semiconductor
文件頁數(shù)： 46/48頁
文件大小： 0K
描述： DSP 24BIT AUD 250MHZ 80-LQFP
標(biāo)準(zhǔn)包裝： 90
系列： DSP56K/Symphony
類型： 音頻處理器
接口： 主機(jī)接口，I²C，SAI，SPI
時(shí)鐘速率： 250MHz
非易失內(nèi)存： 外部
芯片上RAM： 112kB
電壓 - 輸入/輸出： 3.30V
電壓 - 核心： 1.20V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 80-LQFP
供應(yīng)商設(shè)備封裝： 80-LQFP（14x14）
包裝： 托盤
Symphony DSP56724/ DSP56725 Multi-Core Audio Processors, Rev. 2
Freescale Semiconductor
7
For correct operation of the internal power-on reset logic, the Core_VDD ramp rate (Tr) to full supply must be less than 10 ms,
as shown in Figure 4.
Figure 5. Ensure Correct Operation of Power-On Reset with Fast Ramp of Core_VDD
1.1.4
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:
Eqn. 1
where
C=node/pin capacitance
V=voltage swing
f=frequency of node/pin toggle
The maximum internal current (ICCImax) 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 (ICCItyp) value reflects the
average switching of the internal buses on typical operating conditions.
For applications that require very low current consumption, do the following:
Minimize the number of pins that are switching.
Minimize the capacitive load on the pins.
One way to evaluate power consumption is to use a current per MIPS measurement methodology to minimize specific board
effects (for example, to compensate for measured board current not caused by the DSP). Use the test algorithm, specific test
current measurements, and the following equation to derive the current per MIPS value.
I/MIPS = I/MHz = (ItypF2 - ItypF1)/(F2 - F1)
Eqn. 3
where :
ItypF2=current at F2
ItypF1=current at F1
F2=high frequency (any specified operating frequency)
F1=low frequency (any specified operating frequency lower than F2)
Example 1. Power Consumption Example
For a GPIO address pin loaded with 50 pF capacitance, operating at 3.3 V, and with a 150 MHz clock, toggling at
its maximum possible rate (75 MHz), the current consumption is
Eqn. 2
Core_VDD
Tr must be < 10 ms
0V
1.0 V
Tr
IC
V
×
f
×
=
I50x10 12
–
x
3.3x75x106
12.375mA
==
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