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AD28MSP02KN Datasheet(PDF) 10 Page - Analog Devices |
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AD28MSP02KN Datasheet(HTML) 10 Page - Analog Devices |
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10 / 20 page  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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