AD1858JRS datasheet(6/16 Pages) AD

Il numero della parte	AD1858JRS

Spiegazioni elettronici	Stereo, Single Supply 16-, 18- and 20-Bit Sigma-Delta DACs

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AD1857/AD1858

REV. 0

–6–

DEFINITIONS

Dynamic Range

The ratio of a full-scale output signal to the integrated output

noise in the passband (0 kHz 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. This measurement tech-

nique is consistent with the recommendations of the Audio

Engineering Society (AES17-1991) and the Electronic Industries

Association of Japan (EIAJ CP-307).

Total Harmonic Distortion + Noise (THD+N)

The ratio of the root-mean-square (rms) value of a full-scale

fundamental input signal to the rms sum of all other spectral

components in the passband, expressed in decibels (dB) and

as a percentage.

Passband

The region of the frequency spectrum unaffected by the

attenuation of the digital interpolation filter.

Passband Ripple

The peak-to-peak variation in amplitude response from equal-

amplitude input signal frequencies within the passband,

expressed in decibels.

Stopband

The region of the frequency spectrum attenuated by the digital

interpolation filter to the degree specified by “stopband

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 zero input, to a full-

scale 1 kHz sine-wave input on the other channel, expressed in

decibels.

Interchannel Phase Deviation

Difference in output sampling times between stereo channels,

expressed as a phase difference in degrees between 1 kHz

inputs.

Power Supply Rejection

With zero 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 seconds(s). 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 the largest and the smallest

group delays in passband, expressed in microseconds (

µs).

De-Emphasis Gain Error

A measure, expressed in decibels, of the difference between the

ideal 50/15

µs de-emphasis filter response, and the actual 50/15 µs

de-emphasis filter response.

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