AD9148BBCZ datasheet(20/73 Pages) AD

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AD9148

Preliminary Technical Data

Rev. PrA | Page 20 of 73

TERMINOLOGY

Integral Nonlinearity (INL)

INL is defined as 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.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant as the digital input increases.

Offset Error

The deviation of the output current from the ideal of zero is

called offset error. For IOUTx_P, 0 mA output is expected when

the inputs are all 0s. For IOUTx_N, 0 mA output is expected

when all inputs are set to 1.

Gain Error

The difference between the actual and ideal output span. The

actual span is determined by the difference between the output

when all inputs are set to 1 and the output when all inputs are

set to 0.

Output Compliance Range

The range of allowable voltage 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 (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 degrees Celsius. For reference drift, the drift is

reported in ppm per degrees Celsius.

Power Supply Rejection (PSR)

The maximum change in the full-scale output as the supplies

are varied from minimum to maximum specified voltages.

Settling Time

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.

In-Band Spurious Free Dynamic Range (SFDR)

The difference, in decibels, between the peak amplitude of the

output signal and the peak spurious signal between dc and the

frequency equal to half the input data rate.

Out-of-Band Spurious Free Dynamic Range (SFDR)

The difference, in decibels, between the peak amplitude of the

output signal and the peak spurious signal within the band that

starts at the frequency of the input data rate and ends at the

Nyquist frequency of the DAC output sample rate. Normally,

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 to

the DAC output.

Total Harmonic Distortion (THD)

THD is the ratio of the rms sum of the first six harmonic com-

ponents to the rms value of the measured fundamental. It is

expressed as a percentage or in decibels.

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

An interpolation filter up-samples the input digital data by a

multiple of fDATA (interpolation rate) and then filters out the

undesired spectral images created by the up-sampling process.

Adjacent Channel Leakage Ratio (ACLR)

The ratio in 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.

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