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CS5126-KL Datasheet(PDF) 8 Page - Cirrus Logic |
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CS5126-KL Datasheet(HTML) 8 Page - Cirrus Logic |
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8 / 32 page  Differential Nonlinearity The self-calibration scheme utilized in the CS5126 features a calibration resolution of 1/4 LSB, or 18-bits. This ideally yields DNL of ±1/4 LSB, with code widths ranging from 3/4 to 5/4 LSB’s. This insures consistent sound quality independent of signal level. Traditional laser trimmed ADC’s have signifi- cant differential nonlinearities which are disas- trous to sound quality with low-level signals. Appearing as wide and narrow codes, DNL often causes entire sections of the transfer func- tion to be missing. Although their affect is minor on S/(N+D) with high amplitude signals, DNL errors dominate performance with low-level sig- nals. For instance, a signal 80dB below full- scale will slew past only 6 or 7 codes. Half of those codes could be missing with a conven- tional hybrid ADC capable of only 14-bit DNL. The most common source of DNL errors in con- ventional ADC’s is bit weight errors. These can arise due to accuracy limitations in factory trim stations, thermal or physical stresses after cali- bration, and/or drifts due to aging or temperature variations in the field. Bit-weight errors have a drastic effect on a converter’s ac performance. They can be analyzed as step functions superim- posed on the input signal. Since bits (and their errors) switch in and out throughout the transfer curve, their effect is signal dependent. That is, harmonic and intermodulation distortion, as well as noise, can vary with different input condi- tions. Differential nonlinearities in successive-approxi- mation ADC’s also arise due to dynamic errors in the comparator. Such errors can dominate if the converter’s throughput/sampling rate is driven too high. The comparator will not be al- lowed sufficient time to settle during each bit decision in the successive-approximation algo- b. Left Channel with 1 kHz, -80 dB Input Figure 4. FFT Plot of CS5126 in Stereo Mode (Left Channel with 1 kHz, Full-Scale Input) a. Left Channel with 1 kHz, -10 dB Input Figure 5. FFT Plots of CS5126 in Stereo Mode Signal Amplitude Relative to Full Scale Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 24kHz Sampling Rate: 48 kHz Full Scale: 9V p-p S/(N+D): 83.27 dB 1 kHz (dc to 20 kHz) S/(N+D): 84.06 dB Signal Amplitude Relative to Full Scale Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 24kHz Sampling Rate: 48 kHz Full Scale: 9V p-p S/(N+D): 13.70 dB 1 kHz (dc to 20 kHz) S/(N+D): 14.49 dB Signal Amplitude Relative to Full Scale Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 24kHz Sampling Rate: 48 kHz Full Scale: 9V p-p S/(N+D): 91.75 dB 1 kHz (dc to 20 kHz) S/(N+D): 92.53 dB CS5126 8 DS32F1 |
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