AD1839AAS 查看數據表（PDF） - Analog Devices
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AD1839AAS Datasheet PDF : 24 Pages
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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.
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
fundamental input signal to the rms sum of all other spectral
components in the pass band, expressed in decibels.
Pass Band
The region of the frequency spectrum unaffected by the
attenuation 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 identical near full-scale inputs, 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.
AD1839A
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 the 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 microseconds.
More precisely, the derivative of radian phase with respect to
the 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 the pass band, expressed in microseconds.
Acronyms
ADC—Analog-to-digital converter.
DAC—Digital-to-analog converter.
DSP—Digital signal processor.
IMCLK—Internal master clock signal used to clock the ADC
and DAC engines.
MCLK—External master clock signal applied to the AD1839A.
Rev. B | Page 11 of 24
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