- Asynchronous Reclocking
- I2S
- Output Stage
- Error Correction vs. Jitter
- Slaving Computer Soundcards
- Battery for Digital Schematics?
- Stacking Multiple Converter Chips
- Benchmark's UltraLock
- Digital Filtering
- One-box CD Players
- Synchronous Reclocking
- Jitter Sources
- Large Buffer
- Disbelief in LessLoss
- A/D Converters
- Sampling Rates
Question:
You state that the DAC 2004 supports a sampling frequency of 192 kHz. The converter chip you use, the PCM 1704, however, seems to provide only 96 kHz (at least according to my research on the web). Can you help me out of my confusion?
LessLoss Reply:
You need to evaluate a parallel DAC chip such as the 1704 together with the method of oversampling used in conjunction with it, because in this type of chip, the oversampling is not integrated into it, as is the case in Sigma-Delta type chips. The PCM 1704 can handle sample frequencies of up to 768 kHz.
We implement the following oversampling:
--> 8x oversampling at 44.1 and 48 kHz = 352.8 and 384 kHz;
--> 4x oversampling at 88.2 and 96 kHz = 352.8 and 384 kHz;
--> 4x oversampling at 176.4 and 192 kHz = 705.6 and 768 kHz.
The higher numbers you see above are the actual frequencies at which the DAC chip is running!