LME49724 vs. OPA1632 in Addon BalOut

Following performance figures have been measured in Addon BalOut module: Both opamps are so good that it is difficult to measure differences directly. LME49724: Noise level: -117 dBV (A-weighted), THD+N ratio: at least -109 dB (1 kHz, 2 Vrms), around measurement instrument limits. OPA1632: Noise level: -118 dBV (A-weighted), THD+N level: at least -109 dB (1 kHz, 2 Vrms), around measurement instrument limits. Measurements Originally the balanced addon board Addon BalOut for H-DAC have LME49724 fully … Continue reading

Understanding audio measurements: noise, SNR, and dynamic range

SNR is a ratio of level measurement and noise measurement (both typically as RMS level), expressed in dB. Signal level, measurement bandwidth, and weighting filter must be defined. Dynamic range is like SNR but noise is measured in the presence of small signal; results should be the same. Noise is one of the most important performance figures and typically compared to the signal level as SNR, Signal-to-Noise Ratio. In audio … Continue reading