基于MSP430和MAX262程控滤波器的设计

随着手持设备的广泛应用,为了满足系统设备的低功耗要求,设计了基于单片机MSP430、数字频率源LTC6903、开关电容滤波芯片MAX262的低功耗程控滤波器.系统采用单片机控制数字频率源芯片LTC6903提供步进可调的时钟信号,以实现对滤波器截止频率的灵活调节和滤波类型的转换.该系统改善了传统有源滤波器器件参数设计困难...

Design of programmable filter based on MSP430 and MAX262

With the widely application of portable devices,in order to meet the low power consumption demand of systems equipment,a low-power programmable filter was designed based on microcontroller MSP430,digital frequency source chip LTC6903 and programmable switched capacitor filter chip MAX262.This system used digital frequency source chip LTC6903 to provide an adjustable clock,which realized the flexible adjustment of filter cutoff frequency and filter types.The system had overcome the parameter design problems of traditional active filters,and the problem of that flexible cut-off frequency and other parameters are difficult to control.Compared with the traditional active filter,it also has functional shift of low pass,high pass,band pass and trap.Q value of the filter is programmable from 0.5 to 8,and cutoff frequency is adjustable from 100Hz~40kHz.In addition,with the 3.3V power supply condition and the MCU ShutDown mode,this system has lower power consumption than the common one.