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AD28MSP02 Datasheet(PDF) 10 Page - Analog Devices

Part No. AD28MSP02
Description  Voiceband Signal Port
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD28MSP02 Datasheet(HTML) 10 Page - Analog Devices

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AD28msp02
REV. 0
–10–
DEFINITION OF SPECIFICATIONS
Absolute Gain
Absolute gain is a measure of converter gain for a known signal.
Absolute gain is measured with a 1.0 kHz sine wave at 0 dBm0.
The absolute gain specification is used as a reference for gain
tracking error specification.
Gain Tracking Error
Gain tracking error measures changes in converter output for
different signal levels relative to an absolute signal level. The ab-
solute signal level is 1 kHz at 0 dBm0 (equal to absolute gain).
Gain tracking error at 0 dBm0 is 0 dB by definition.
SNR + THD
Signal-to-noise ratio plus total harmonic distortion is defined to
be the ratio of the rms value of the measured input signal to the
rms sum of all other spectral components in the frequency range
300 Hz–3400 Hz, including harmonics but excluding dc.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities will create distortion
products at sum and difference frequencies of mfa
± nfb where
m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for which
neither m or n are equal to zero. For final testing, the second or-
der terms include (fa + fb) and (fa – fb), while the third order
terms include (2fa + fb), (2fa – fb), (fa + 2fb), and (fa – 2fb).
Idle Channel Noise
Idle channel noise is defined as the total signal energy measured
at the output of the device when the input is grounded (mea-
sured in the frequency range 300 Hz–3400 Hz).
Crosstalk
Crosstalk is defined as the ratio of the amplitude of a full-scale
signal appearing on one channel to the amplitude of the same
signal which couples onto the adjacent channel. Crosstalk is ex-
pressed in dB.
Power Supply Rejection
Power supply rejection measures the susceptibility of a device to
noise on the power supply. Power supply rejection is measured
by modulating the power supply with a sine wave and measuring
the noise at the output (relative to 0 dB).
Group Delay
Group delay is defined as the derivative of radian phase with re-
spect to radian frequency,
∂φ(ω)/∂ω. Group delay is a measure
of average delay of a system as a function of frequency. A linear
system with a constant group delay has a linear phase response.
The deviation of group delay away from a constant indicates the
degree of nonlinear phase response of the system.


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