Other Parts Discussed in Thread: PCM1862, PCM1864
Looking to choose an ADC for audio application
Questions:
The TLV320ADC3101 datasheet lists SNR as 92dBa average, but only 80dBa minimum. The difference between average and minimum seems too large; PCM series ADC has 5dB difference.
1.) A typo or a problem?
2.) What is the reality?
3.) Perhaps flicker noise? The graph in the datasheet seems flat and shows noise floor as low as -120dB.
This is being considered for an industrial PA amp and the SNR has to be >80dB. The rest of the signal chain is good, but the ADC can become a bottleneck. Naturally, 80dB at the ADC is a concern.
4.) Any advice from the experts?
There are two ADC models suitable for the design, PCM1862 or TLV320ADC3101, and the preference is more toward the TLV320ADC3101 because of its mini-DSP functionality.
The is for up to 4 single-channel ADCs, but there is a drawback on the PCM1864 , because TSA5558 does not seem to support TDM on I2S input. Therefore, a couple of stereo ADC connected to different I2S inputs should suffice.
