AD9142ABCPZRL datasheet(21/73 Pages) AD

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AD9142A

Data Sheet

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 IOUT1P, 0 mA output is expected when all inputs

are set to 0. For IOUT1N, 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 all inputs are set to 1 and the output when all

inputs are set to 0.

Output Compliance Range

The output compliance range is 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 degree Celsius. For reference drift, the

drift is reported in ppm per degree Celsius.

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, the interpolation

filters reject energy in this band. 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.

Rev. A | Page 20 of 72

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