请问AD6620的FIR滤波器是什么类型的滤波器呢？

您好！
FIR滤波片主要参数如下。
2nd Order Cascaded Integrator Comb FIR Filter
Linear Phase, Fixed Coefficients
Programmable Decimation Rates: 2, 3 . . . 16
 
5th Order Cascaded Integrator Comb FIR Filter
Linear Phase, Fixed Coefficients
Programmable Decimation Rates: 1, 2, 3 . . . 32
 
Programmable Decimating RAM Coefficient FIR Filter
Up to 134 Million Taps per Second
256 20-Bit Programmable Coefficients
Programmable Decimation Rates: 1, 2, 3 . . . 32
主要作用是滤波，抽取。