AD9173 datasheet(24/144 Pages) AD

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Data Sheet

AD9173

TERMINOLOGY

analog.com

Rev. C | 24 of 144

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 the deviation of the output current from the ideal

value of 0 mA. For DACx+, a 0 mA output is expected when all

inputs are set to 0. For DACx−, a 0 mA output is expected when all

inputs are set to 1.

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 break-

down, resulting in nonlinear performance.

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 parts per million of full-scale

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

reported in parts per million per degrees 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.

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.

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.

Channel Datapath

The channel datapaths, sometimes referred to as channelizers, are

the complex data channel datapaths, before the summing node in

the chip, that can be used or bypassed depending on the mode

of operation chosen. When these channelizers are in use, complex

data input is required. The channel datapaths include independently

controlled optional gain stages and channel NCOs per channel.

There is also a selectable channel interpolation block that is config-

urable (same setting for all channel interpolation blocks) depending

on the mode of operation chosen.

Main Datapath

The main datapath refers to the portion of the digital datapath

after the summing node in the chip, up to each of the main DAC

analog cores. Each of these main datapaths includes an optional

PA protection block with a feed forward to the ramp up/down

gain stage block for muting the DAC outputs before damaging a

power amplifier in the transmit path. There is a selectable main

interpolation block that is configurable (same setting for both main

interpolation blocks) depending on the mode of operation chosen.

Each main datapath also contains an individually programmable

main NCO per main DAC datapath that can be optionally used

depending on the mode of operation.

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 chan-

nel.

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 interpo-

lating factor may be given.

Physical (PHY) Lane

Physical Lane x refers to SERDINx±.

Logical Lane

Logical Lane x refers to physical lanes after optionally being remap-

ped by the crossbar block (Register 0x308 to Register 0x30B).

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.

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