TMS320C2XX系列DSP双电源电压供电电路的两种方案

TMS320系列DSP具有高性能，低成本等特点，在许多系统中得到了应用，为了有效降低系统的功耗，对DSP芯片采用双电源供电是十分必要的。TMS320C206是TMS320C2000系列中采用双电源供电的16位定点DSP产品。本文针对系统输入电压的不同情况介绍了两种TMS320C206的双电源供电电路，该方案也适用于其它采用5V／3．3V供电的DSP。

Two Designs of the Dual Power Supply Circuit for TMS320C2XX

The TMS320 family digital signal processors(DSPs) have an architecture designed specifically for real-time signal processing.Its high performance as well as low cost and other characteristics make this family the ideal choice for a wide range of processing applications.It is important to use two power supply to decrease the power assume in many DSP-based system.This paper describes two options used to supply power to the TMS320C206-one member of the TMS320C2000 digital signal processor(DSP) product families.The TMS320C206 DSP requires 3.3V for the CPU and 5.0V for the I/O.The first solution applise when a design already has a regulated 5.0V power supply and requires only a 3.3V(LDO) Low Dropout regulator.The second solution applies an unregulated voltage input to both LDO regulators to generate the 5.0V and 3.3V voltages.As voltage requirements become stricter,tighter tolerance regulators,such as the TI TPS71/72/73 families of LDOs,are required.