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Question asked by
on May 2, 2011
on May 2, 2011 by tdas
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What are some of the common DAC terminologies/parameters?
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May 2, 2011 12:19 PM
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.
The deviation of the output current from the ideal of zero is called offset error. For IOUT1P, 0 mA output is expected when the inputs are all 0s. For IOUT1N, 0 mA output is expected when all inputs are set to 1.
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 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)
The maximum change in the full-scale output as the supplies are varied from minimum to maximum specified voltages.
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)
The difference, in decibels, between the peak amplitude of the output signal and the peak spurious signal within the dc to the 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 to 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.
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)
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.
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