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| 型号： | DSPB56725CAF |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 46/48页 |
| 文件大小： | 0K |
| 描述： | IC DSP 24BIT 80LQFP |
| 标准包装： | 90 |
| 系列： | DSP56K/Symphony |
| 类型： | 音频处理器 |
| 接口： | 主机接口，I²C，SAI，SPI |
| 时钟速率： | 200MHz |
| 非易失内存： | 外部 |
| 芯片上RAM： | 112kB |
| 电压 - 输入/输出： | 3.30V |
| 电压 - 核心： | 1.00V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-LQFP（14x14） |
| 包装： | 托盘 |
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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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