我在网上找到一款集成的,LT1569-7,还不确定行不行。参数如下:
FEATURES
1)One External R Sets Cutoff Frequency
2) Root Raised Cosine Response
3)Up to 300kHz Cutoff on a Single 5V Supply
4) Up to 150kHz Cutoff on a Single 3V Supply
5)10th Order, Linear Phase Filter in an SO-8
6)DC Accurate, VOS(MAX) = 5mV
7)Low Power Modes
8) Differential or Single-Ended Inputs
9) 80dB CMRR (DC)
10) 80dB Signal-to-Noise Ratio, VS = 5V
11) Operates from 3V to ±5V Supplies
截止频率(128KHz)刚好能够在我需要的范围之内。