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Data Sheet

AD9166

Rev. 0 | Page 25 of 138

TERMINOLOGY

Offset Error

Offset error is the deviation of the DAC output current from the

ideal of 0 mA.

Gain Error

Gain error is the difference between the actual and ideal output

span. The actual span is determined by the difference between

the output when the input is at its minimum code and the

output when the input is at its maximum code.

Temperature Drift

Temperature drift is specified as the maximum change from the

ambient (25°C) value to the value at either TMIN or TMAX. For offset

and gain drift, the drift is reported in ppm of full-scale range

(FSR) per degree Celsius. For reference drift, the drift is reported

in ppm per degree Celsius.

Settling Time

Settling time is the time required for the output to reach and

remain within a specified error band around its final value,

measured from the start of the output transition.

Spurious-Free Dynamic Range (SFDR)

SFDR is the difference, in decibels relative to carrier (dBc),

between the peak amplitude of the output signal and the peak

spurious signal within the dc to Nyquist frequency of the DAC.

Typically, energy in this band is rejected by the interpolation

filters. This specification, therefore, defines how well the

interpolation filters work and the effect of other parasitic

coupling paths on the DAC output.

x-Order Intermodulation Distortion (IMDx)

IMDx (where x is 2, 3, 5, or 7 for second-order, third-order,

fifth-order, or seventh-order intermodulation distortion) is the

difference, in decibels relative to carrier (dBc), between the peak

amplitude of the output signal and the peak intermodulation

product of a specific x-order within the dc to Nyquist frequency

of the DAC. The signal is composed of two continuous wave

tones. If multiple IMDx products are present, the IMDx that is

located nearest to the signal and containing the highest power is

chosen to calculate the difference. This specification defines the

linearity of the analog output stage.

Signal-to-Noise Ratio (SNR)

SNR is the ratio of the rms value of the measured output signal

to the rms sum of all other spectral components below the Nyquist

frequency, excluding the first six harmonics and dc. The value

for SNR is expressed in decibels.

Error Vector Magnitude (EVM)

EVM defines the average deviation of a modulation symbol

from its ideal location within a decision boundary. Typically,

EVM is quoted as the rms average of all error vector

magnitudes between the received symbols and their ideal

locations, for a given modulation order. For example, EVM for a

quadrature phase shift keying (QPSK) signal is the average of

the EVM across four decision boundaries. EVM is measured

using a baseband signal that is a pseudorandom binary

sequence (PRBS) of a statistically significant length.

Interpolation Filter

If the digital inputs to the DAC are sampled at a multiple rate of

the interpolation rate (fDATA), a digital filter can be constructed that

has a sharp transition band near fDATA/2. Images that typically

appear around the output data rate (fDAC) can be greatly suppressed.

Adjacent Channel Leakage Ratio (ACLR)

ACLR is the ratio in decibels relative to the carrier (dBc)

between the measured power within a channel relative to its

adjacent channel.

Adjusted DAC Update Rate

The adjusted DAC update rate is the DAC update rate divided

by the smallest interpolating factor. For clarity on DACs with

multiple interpolating factors, the adjusted DAC update rate for

each interpolating factor can be given.

Physical Lane

Physical Lane x refers to SERDINx±, where x represents 0 to 7.

Logical Lane

Logical Lane x (where x represents 0 to 7) refers to physical

lanes after optionally being remapped by the crossbar block

(Register 0x308 to Register 0x30B).

Link Lane

Link Lane x refers to logical lanes considered in the link, where

x represents 0 to 7.

AD9166 Datasheet(PDF) 25 Page - Analog Devices

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