ads1278内部的线性滤波器

大家好，我想请问一下ads1278内部的线性滤波器是多少阶的。另外，在数据输出端口我把数据存入FPGA的ram里面，但是要把数据复现信号波形的时候，不能从第一个数据开始把数上传，而是要从第N个开始（N是多次试验出来的值），请问这是和ads1278内部的线性滤波器有关吗，这个问题有别的解释吗

关于滤波器,  手册有介绍

FREQUENCY RESPONSE

The digital filter sets the overall frequency response. within the signal passband. The filter uses a multi-stage FIR topology to provide linear phase with minimal passband ripple and high stop band attenuation. The filter coefficients are identical to the coefficients used in the ADS1271. The oversampling ratio of the digital filter (that is, the ratio of the modulator sampling to the output data rate, or fMOD/fDATA) is a function of the selected mode, as shown in Table 3.

那么我想问下 a multi-stage FIR 究竟是几阶呢

Airwill

关于滤波器,  手册有介绍

FREQUENCY RESPONSE

The digital filter sets the overall frequency response. within the signal passband. The filter uses a multi-stage FIR topology to provide linear phase with minimal passband ripple and high stop band attenuation. The filter coefficients are identical to the coefficients used in the ADS1271. The oversampling ratio of the digital filter (that is, the ratio of the modulator sampling to the output data rate, or fMOD/fDATA) is a function of the selected mode, as shown in Table 3.