AD1837AASZ datasheet(10/24 Pages) AD

10 / 24 page

REV. A

AD1837A

–10–

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 funda-

mental input signal to the rms sum of all other spectral compo-

nents 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 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 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

(

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 frequencies.

Specified as the difference between largest and the smallest

group delays in the pass band, expressed in microseconds (

ms).

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 AD1837A.

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