TigerShar DSP有3个电源,其中数字2.5 V(VDD_Io)为I/0供电;数字1.2 V(VDD)为DSP内核供电;模拟1.2 V(VDD_A)内部锁相环和倍频电路供电。系统将主机提供的5V,经过TPS54350得到2.5V和1.2 V的电压。各片DSP的数字1.2V(VDD)电源各由1个TPS54350供给。5个。DSP内部模块1.2V(VDD)由同一个。DSP的VDD(+1.2V)经滤波网络后解决。5个。DSP的FO 2.5V电源直接由主机提供的5V经过TPS54350得到2.5V统一供给,同时提供FPGA(EPU1。K30)的VccM(+2.5 V)电压。其中FPGA的Vcc_IO(+3.3V)利用TPS54350输出的+3.3V电压来供电。本系统的供电电路框图如图2所示。图3示出单个DSP的内核供电电路框图及外围电路配置。
T37S54350采用小型16引脚HTSSOP封装。根据以往的经验,建议设计PC板时好给TPS54350加上散热片,电源线尽量粗一点。在TPS54350的前后均加上滤波网络,尽量保证得到比较合适的电压。
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