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AD1838AS Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças AD1838AS
Descrição Electrónicos  2 ADC, 6 DAC,96 kHz, 24-Bit Codec
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Página de início  http://www.analog.com
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REV. 0
AD1838
–10–
DEFINITIONS
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 fundamen-
tal 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 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 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.
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 milliseconds.
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.
GLOSSARY
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 AD1838


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