手册中并未看到tlv320aic23b的AD转换和DA转换精度是多少位的, 外界晶振12.288M时,IWL=11.分别设置DA和AD相同频率,即时都设置为48khz,32khz,8khz,,采用时钟为MCLK/4=3.072Mhz,IIS模式下,是否能得到帧频=采样频率?
都设置为48khz时,此时测得LRCIN/LRCOUT频率为48k,计算(采样率x一帧数据位数)=(采样频率)即48k x 64位=3.072M=mclk/4,此项能对应上,
都设置为32khz时,此时测得LRCIN/LRCOUT频率为8k,1.为何此时得采样率和帧频不能对应上,2.计算 8k x 64位=512k 不等于mclk/4
都设置位 8khz时,此时测得LRCIN/LRCOUT频率为32k,1.为何采样率和帧频不能对应上,2计算 32k x64位=2.048M不等于mclk/4
user151383853:
The analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) within the TLV320AIC23B use multibit sigma-delta technology with integrated oversampling digital interpolation filters. Data-transfer word lengths of 16, 20, 24, and 32 bits, with sample rates from 8 kHz to 96 kHz, are supported. The ADC sigma-delta modulator features third-order multibit architecture with up to 90-dBA signal-to-noise ratio (SNR) at audio sampling rates up to 96 kHz
通过过采样技术, 得到 16,20,24,32 bit