14

AMC1336

SBAS951 – AUGUST 2019

www.ti.com

Product Folder Links: AMC1336

Submit Documentation Feedback

Copyright © 2019, Texas Instruments Incorporated

Feature Description (continued)

As depicted in Figure 6, the modulator shifts the quantization noise to high frequencies. Therefore, use a low-

pass digital filter at the output of the device to increase the overall performance. This filter is also used to convert

from the 1-bit data stream at a high sampling rate into a higher-bit data word at a lower rate (decimation). TI's

microcontroller families TMS320F2807x and TMS320F2837x offer a suitable programmable, hardwired filter

structure termed a sigma-delta filter module (SDFM) optimized for usage with the AMC1336. Furthermore, the

SD24_B converters on the MSP430F677x microcontrollers offer a path to directly access the integrated sinc

filters for a simple system-level solution for multichannel, isolated current sensing. An additional option is to use a

suitable application-specific device, such as the AMC1210 (a four-channel digital sinc-filter). Alternatively, a field-

programmable gate array (FPGA) can be used to implement the filter.