Sample Rate Converters (SRC) are used whenever there is a need to convert an input sampling frequency to a different sampling rate. This application note introduces the TAX5X1X Synchronous SRC (SSRC), the supported sampling ratios, the different modes and follow by some use case examples.
SSRC is supported in TAC5212, TAC5211,TAC5112, TAC5111, TAD5212, TAD5112, and TAA5212 devices.
All trademarks are the property of their respective owners.
In a system where different sample rates are running, there are times a Sampling Rate Converter is needed to convert one sampling rate to another. The idea of SRC is using the sequence of discrete time sampled at a certain input sampling frequency, and with some conversion technique, create a new sequence of discrete sampled at a different rate from the input. There are Synchronous and Asynchronous converters. Synchronous converters are those with a known input sampling frequency and conversion factor, where as Asynchronous converters are systems where the exact sampling frequencies are not known. The conversion process interpolates or decimates the input signal sampled at the input signal sampling rate to the desired signal at output sample rate. Figure 1-1 shows a Sampling Rate Converter model.
TAX5X1X Converter supports 2 independent Audio Serial Interface (ASI); Primary ASI (PASI) and Secondary ASI (SASI). Primary ASI bus has direct mapping to the external pins and Secondary ASI bus is mapped or muxed through General Purpose Input Output pins. This is shown in the diagram below for TAX5212, TAX5112, TAX5211, TAX5111 device family and TAX5412, TAX5312, TAX5411, TAX5311 family.