AD28MSP02 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD28MSP02

Voiceband Signal Port

Analog Devices 

AD28msp02

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.

–10–

REV. 0

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