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AD9775 Datasheet(PDF) 9 Page - Analog Devices |
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AD9775 Datasheet(HTML) 9 Page - Analog Devices |
9 / 48 page REV. 0 AD9775 –9– DEFINITIONS OF SPECIFICATIONS Adjacent Channel Power Ratio (ACPR) A 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 are redundant and have the effect of wasting transmitter power and system bandwidth. By placing the real part of a second complex modu- lator in series with the first complex modulator, either the upper or lower frequency image near the second IF can be rejected. Complex Modulation The process of passing the real and imaginary components of a signal through a complex modulator (transfer function = e j t = cos t + jsin t) and realizing real and imaginary components on the modulator output. 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. Gain Error The difference between the actual and ideal output span. The actual span is determined by the output when all inputs are set to “1,” minus the output when all inputs are set to “0.” Glitch Impulse Asymmetrical switching times in a DAC give rise to undesired output transients that are quantified by a glitch impulse. It is specified as the net area of the glitch in pV–S. Group Delay Number of input clocks between an impulse applied at the device input and peak DAC output current. A half-band FIR filter has constant group delay over its entire frequency range. Impulse Response Response of the device to an impulse applied to the input. 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 with a sharp transition band near fDATA/2. Images that would typically appear around fDAC (output data rate) can be greatly suppressed. Linearity Error (Also Called Integral Nonlinearity or INL) Linearity error is defined as the maximum deviation of the actual analog output from the ideal output, determined by a straight line drawn from zero to full scale. Monotonicity A D/A converter 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 “0” is called offset error. For IOUTA, 0 mA output is expected when the inputs are all “0.” For IOUTB, 0 mA output is expected when all inputs are set to “1.” Output Compliance Range The range of allowable voltage at the output of a current output DAC. Operation beyond the maximum compliance limits may cause either output stage saturation or breakdown, resulting in nonlinear performance. Pass Band Frequency band in which any input applied therein passes unattenuated to the DAC output. Power Supply Rejection 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 about its final value, measured from the start of the output transition. 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. Spurious-Free Dynamic Range The difference, in dB, between the rms amplitude of the output signal and the peak spurious signal over the specified bandwidth. Stop-Band Rejection The amount of attenuation of a frequency outside the pass band applied to the DAC, relative to a full-scale signal applied at the DAC input within the pass band. 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 °C. For reference drift, the drift is reported in ppm per °C. 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 (dB). |
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