ADAV4622BSTZ datasheet(18/28 Pages) AD

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ADAV4622

Rev. B | Page 18 of

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.

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 a near full-scale input, the ratio of the actual output to the

expected output, expressed in dB.

Interchannel Gain Mismatch

With identical near full-scale inputs, the ratio of the outputs of

the two stereo channels, expressed in decibels.

Crosstalk

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, the 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 milliseconds (ms).

More precisely, the derivative of radian phase with respect to

radian frequency at a given frequency.

SIF Input Isolation

The level of the crosstalk between the SIF inputs in dB.

FM Limiting Sensitivity

FM limiting sensitivity is given by the modulated carrier level

that gives half the power to the FM demodulator’s output

amplitude comparing to that when the carrier level satisfies

the demodulator’s limiting level.

Deviation Mode

In some regions, the transmitted signal can deviate from the

specification. In order for the ADAV4622 to decode these high

deviation signals correctly, the appropriate modulation level

must be selected.

AM Rejection Ratio

AM rejection ratio is given by the ratio of FM (deviation = 54%)

demodulated audio level vs. residual AM (modulation = 27%)

demodulated audio level at the same carrier level. It is the ability

of the receiver to not mistake an AM signal for an FM signal.

AM Sensitivity

AM sensitivity is a measure of how well the receiver picks up

very weak AM signals.

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