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AD9154

Data Sheet

Rev. C | Page 20 of 124

TERMINOLOGY

Integral Nonlinearity (INL)

INL is the maximum deviation of the actual analog output from

the ideal output, determined by a straight line drawn from zero

scale to full scale.

Differential Nonlinearity (DNL)

DNL is the measure of the variation in analog value, normalized

to full scale, associated with a 1 LSB change in digital input code.

Offset Error

Offset error is a measure of how far from full-scale range (FSR)

the DAC output current is at 25°C (in ppm).

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.

Output Compliance Range

The output compliance range is the range of allowable voltages

at the output of a current output DAC. Operation beyond the

maximum compliance limits can cause either output stage

saturation or breakdown, resulting in nonlinear performance.

Temperature Drift

Temperature drift is specified as the maximum change from the

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

and gain drift, the drift is reported in ppm of FSR 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, 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.

Interpolation Filter

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

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

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

appear around fDAC (output data rate) 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.

Complex Image Rejection

In a single sideband upconversion, two images are created

around the second IF frequency; the desired signal is on one of

these images. The other signal is unwanted, and a complex

modulator rejects this unwanted image.

Adjusted DAC Update Rate

The adjusted DAC update rate the DAC update rate divided by

the selected interpolation factor.

Physical Lane

Physical Lane x refers to SERDINx±.

Logical Lane

Logical Lane x refers to physical lanes after optionally being

remapped by the crossbar block (Register 0x308 to

Link Lane

Link Lane x refers to logical lanes considered per link. When

paging Link 0 (Register 0x300, Bit 2 = 0), Link Lane x = Logical

Lane x. When paging Link 1 (Register 0x300, Bit 2 = 1, dual link

only), Link Lane x = Logical Lane x + 4.

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