AD1839 Analog Devices, AD1839 Datasheet - Page 9

• Manufacturer Part Number: AD1839
• Description: 2 ADC, 6 DAC 96 Khz, 24-Bit Sigma Delta Codec
• Manufacturer: Analog Devices

50
Output for Control Data
51
Control Clock Input for Control Data
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
(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 funda-
mental 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.”
REV. PrD
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PRELIMINARY TECHNICAL DATA
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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 grounded input to a
full-scale 1 kHz sine-wave input on the other channel, ex-
pressed 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, ex-
pressed 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.
Group Delay Variation
The difference in group delays at different input frequen-
cies.
Specified as the difference between largest and the smallest
group delays in the pass band, expressed in microseconds (µs).
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 AD1839
AD1839