基于DRV6xx系列DAC后置滤波器设计

　　Introduction

　　The DRV6xx family of devices is 2-to-3 Vrms， pop-free， stereo line drivers， which are designed to allow simplified system architecture and reduce total component count and cost. Designed using the Texas Instruments patented DirectPath™ technology， the device integrates a charge pump to generate a negative supply rail that provides a clean， pop-free， ground-biased output capable of driving up to 2 Vrms with only a single 3.3-V supply voltage.

　　The DRV6xx family has built-in shutdown control （Enable pin） for pop-free， on/off control. Some family members such as the DRV603 have an external undervoltage protection （UVP） pin that can be used to detect system power loss and mute the outputs automatically. This function can fully eliminate pop noise generated by a prestage circuit （such as a DAC） during power loss.