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AD1858JRSRL bảng dữ liệu(PDF) 6 Page - Analog Devices |
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6 / 16 page AD1857/AD1858 REV. 0 –6– DEFINITIONS Dynamic Range The ratio of a full-scale output signal to the integrated output noise in the passband (0 kHz to 20 kHz), expressed in decibels (dB). Dynamic range is measured with a –60 dB input signal and is equal to (S/[THD+N]) + 60 dB. Note that spurious harmonics are below the noise with a –60 dB input, so the noise level establishes the dynamic range. This measurement tech- nique is consistent with the recommendations of the Audio Engineering Society (AES17-1991) and the Electronic Industries Association of Japan (EIAJ CP-307). Total Harmonic Distortion + Noise (THD+N) The ratio of the root-mean-square (rms) value of a full-scale fundamental input signal to the rms sum of all other spectral components in the passband, expressed in decibels (dB) and as a percentage. Passband The region of the frequency spectrum unaffected by the attenuation of the digital interpolation filter. Passband Ripple The peak-to-peak variation in amplitude response from equal- amplitude input signal frequencies within the passband, expressed in decibels. Stopband The region of the frequency spectrum attenuated by the digital interpolation filter to the degree specified by “stopband attenuation.” Gain Error With a near full-scale input, the ratio of actual output to expected output, expressed as a percentage. Interchannel Gain Mismatch With identical near full-scale inputs, the ratio of outputs of the two stereo channels, expressed in decibels. Gain Drift Change in response to a near full-scale input with a change in temperature, expressed as parts-per-million (ppm) per °C. Crosstalk (EIAJ Method) Ratio of response on one channel with a zero input, to a full- scale 1 kHz sine-wave input on the other channel, expressed in decibels. Interchannel Phase Deviation Difference in output sampling times between stereo channels, expressed as a phase difference in degrees between 1 kHz inputs. Power Supply Rejection With zero input, signal present at the output when a 300 mV p-p signal is applied to power supply pins, expressed in decibels of full scale. Group Delay Intuitively, the time interval required for an input pulse to appear at the converter’s output, expressed in seconds(s). More precisely, the derivative of radian phase with respect to radian frequency at a given frequency. Group Delay Variation The difference in group delays at different input frequencies. Specified as the difference between the largest and the smallest group delays in passband, expressed in microseconds ( µs). De-Emphasis Gain Error A measure, expressed in decibels, of the difference between the ideal 50/15 µs de-emphasis filter response, and the actual 50/15 µs de-emphasis filter response. |
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