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AD1871 Arkusz danych(PDF) 12 Page - Analog Devices |
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AD1871 Arkusz danych(HTML) 12 Page - Analog Devices |
12 / 28 page AD1871 –12– REV. 0 TERMINOLOGY Dynamic Range The ratio of a full-scale input signal to the integrated input noise in the pass band (20 Hz 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. The dynamic range is specified with and without an A-Weight filter applied. Signal to (Total Harmonic Distortion + Noise) (S/[THD+N]) The ratio of the root-mean-square (rms) value of the fundamen- tal input signal to the rms sum of all other spectral components in the pass band, expressed in decibels (dB). Pass Band The region of the frequency spectrum unaffected by the attenu- ation of the digital decimator’s filter. Pass-Band Ripple The peak-to-peak variation in amplitude response from equal- amplitude input signal frequencies within the pass band, expressed in decibels. Stop Band The region of the frequency spectrum attenuated by the digital decimator’s filter to the degree specified by stop-band attenuation. Gain Error With a near full-scale input, the ratio of the actual output to the expected output, expressed as a percentage. Interchannel Gain Mismatch With identical near full-scale inputs, the ratio of the 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 grounded input to a full-scale 1 kHz sine-wave input on the other channel, expressed in decibels. Power Supply Rejection With no analog 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 milliseconds (ms). More precisely, the derivative of radian phase with respect to radian frequency at a given frequency. GLOSSARY ADC—Analog-to-Digital Converter DSP—Digital Signal Processor IMCLK—Internal master clock signal, used to clock the deci- mating filter section. (Its frequency must be 256 ¥ fS.) MCLK—External master clock signal applied to the AD1871. Its frequency can be 256, 512, or 768 ¥ fS. MCLK is divided internally to give an IMCLK frequency that must be 256 ¥ fS. MODCLK—This is the - modulator clock that determines the sample rate of the modulator. Ideally, it should not exceed the lower of 6.144 MHz or 128 ¥ fS. The MODCLK is derived from the IMCLK by a divider that can be selected as /2 or /4. MUX—Multiplexer PGA—Programmable Gain Amplifier |
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