AD9136-EBZ datasheet(15/117 Pages) AD

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Data Sheet

AD9135/AD9136

Rev. C | Page 15 of 117

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 the deviation of the output current from the ideal

of 0 mA. For OUTx+, 0 mA output is expected when all inputs

are set to 0. For OUTx−, 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 breakdown, resulting in nonlinear performance.

Temperature Drift

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

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

measure of the slope of the DAC output current across its full

ambient operating temperature range, TA (in ppm/°C).

Power Supply Rejection (PSR)

PSR is the maximum change in the full-scale output as the supplies

are varied from minimum to maximum specified voltages.

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

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 traditional two-part upconversion, two images are created

around the second IF frequency. These images have the effect

of wasting transmitter power and system bandwidth. By placing

the real part of a second complex modulator in series with the

first complex modulator, either the upper or lower frequency

image near the second IF can be rejected.

Adjusted DAC Update Rate

The adjusted DAC update rate is defined as 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 may be given.

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[2] = 0), Link Lane x = Logical

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

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

AD9136-EBZ Datasheet(PDF) 15 Page - Analog Devices

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