参数资料
| 型号： | SOUNDBITE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 65/68页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO AUDIO DEVELOPMENT |
| 标准包装： | 1 |
| 系列： | Symphony™ soundBite |
| 主要目的： | 音频，音频处理 |
| 已用 IC / 零件： | DSPB56371 |
| 主要属性： | 最高 8 通道数字音频 |
| 次要属性： | USB、I2C、SPI 接口 |
| 已供物品： | 板，缆线，CD |
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Electrical Design Considerations
?
At power-up, ensure that the voltage difference between the 3.3 V tolerant pins and the chip V CC
never exceeds a 3.00 V.
21.1 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:
I = C × V × f
Eqn. 6
where
C=node/pin capacitance
V=voltage swing
f=frequency of node/pin toggle
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
I = 50 x 10 – 12 x 3.3 x 75 x 10 6 = 12.375 mA
Eqn. 7
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:
? 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 = (I typF2 - I typF1 )/(F2 - F1)
Eqn. 8
where :
I typF2 =current at F2
I typF1 =current at F1
F2=high frequency (any specified operating frequency)
F1=low frequency (any specified operating frequency lower than F2)
NOTE
F1 should be significantly less than F2. For example, F2 could be 66 MHz and F1 could be
33 MHz. The degree of difference between F1 and F2 determines the amount of precision
with which the current rating can be determined for an application.
DSP56371 Data Sheet, Rev. 4.1
Freescale Semiconductor
65
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| SP339EER1-0A-EB | BOARD EVALUATION FOR SP339E |
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| SP720ABT | TVS ARRAY ESD 14 INPUT 16-SOIC |
| SP721ABG | TVS ARRAY ESD 6 INPUT 8-SOIC |
| SP721ABT | TVS ARRAY ESD 6 INPUT 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SOURCE INSPECTION | 制造商:Vishay Dale 功能描述:FACTORY INSPECTION |
| SOURCE INSPECTION CHARGE | 制造商:Leach International Corporation 功能描述:SUB MINIATURE - Virtual or Non-Physical Inventory (Software & Literature) |
| SOURCEINSPECTION/SG1549Y-12824 | 制造商:Microsemi Corporation 功能描述:CURRENT SENSE LATCH - Bulk |
| SOVEREIGN 10-300 | 制造商:Fane International 功能描述:Sovereign Series 10" Professional Audio Woofer - 300W RMS |
| SOVEREIGN 12-200 | 制造商:Fane International 功能描述:Sovereign Series 12 Inch Prosound Woofer 200W |
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