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AD9774ASZ Datasheet(PDF) 7 Page - Analog Devices |
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AD9774ASZ Datasheet(HTML) 7 Page - Analog Devices |
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7 / 24 page  AD9774 –7– REV. B DEFINITIONS OF SPECIFICATIONS 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. Differential Nonlinearity (or 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 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 zero is called offset error. For IOUTA, 0 mA output is expected when the inputs are all 0s. For IOUTB, 0 mA output is expected when all inputs are set to 1s. 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 1s, minus the output when all inputs are set to 0s. 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. Temperature Drift Temperature drift is specified as the maximum change from the ambient (+25 °C) value to the value at either T MIN or TMAX. For offset and gain drift, the drift is reported in ppm of full-scale range (FSR) per degree C. For reference drift, the drift is re- ported in ppm per degree C. Power Supply Rejection The maximum change in the full-scale output as the supplies are varied from nominal to minimum and 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. Glitch Impulse Asymmetrical switching times in a DAC give rise to undesired output transients that are quantified by a glitch impulse. It is specified the net area of the glitch in pV-s. 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. Total Harmonic Distortion THD is the ratio of the rms sum of the first six harmonic com- ponents to the rms value of the measured input signal. It is expressed as a percentage or in decibels (dB). Signal-to-Noise Ratio (SNR) S/N 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. Passband Frequency band in which any input applied therein passes unattenuated to the DAC output. Stopband Rejection The amount of attenuation of a frequency outside the passband applied to the DAC, relative to a full-scale signal applied at the DAC input within the passband. Group Delay Number of input clocks between an impulse applied at the device input and peak DAC output current. Impulse Response Response of the device to an impulse applied to the input. VCO IN/EXT PLL DIVIDE PLLCOM REFLO PLL CLOCK MULTIPLIER REFIO CLK IN/OUT SNOOZE IOUTA FSADJ AD9774 SLEEP DCOM DVDD ICOMP ACOM AVDD +1.2V REFERENCE AND CONTROL AMP PLL ENABLE PLLLOCK CLK4 IN PLLVDD LPF IOUTB EDGE TRIGGERED LATCHES 14-BIT DAC 2 2 1 2 4 4 14 14 14 14 DIGITAL DATA 50 20pF 50 20pF 0.1 F 100 MINI-CIRCUITS T1-1T TO HP3589A SPECTRUM / NETWORK ANALYZER 50 INPUT 0.01 F 1.5k +3VD +3VD +3VD 0.1 F +5VA 1.91k 0.1 F REFCOMP Figure 3. Basic AC Characterization Test Setup |
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