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AD9751-EB Datasheet(PDF) 6 Page - Analog Devices |
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AD9751-EB Datasheet(HTML) 6 Page - Analog Devices |
6 / 26 page REV. 0 AD9751 –6– 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 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 C. For reference drift, the drift is reported in ppm per degree C. 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. 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. 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 fundamental. 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. Adjacent Channel Power Ratio (or ACPR) A ratio in dBc between the measured power within a channel relative to its adjacent channel. AD9751 IOUTA IOUTB SEGMENTED SWITCHES FOR DB0 TO DB9 DAC FSADJ REFIO 1.2V REF CLK+ PLLLOCK DIGITAL DATA INPUTS 0.1 F RSET 2k 1k 50 MINI CIRCUITS T1-1T TO ROHDE AND SCHWARZ FSEA30 SPECTRUM ANALYZER DB0 – DB9 TEKTRONIX DG2020 OR AWG2021 w/OPTION 4 LECROY 9210 PULSE GENERATOR (FOR DATA RETIMING) DCOM PMOS CURRENT SOURCE ARRAY AVDD 3.1V TO 3.5V DVDD 2 -1 MUX PORT 1 LATCH DAC LATCH ACOM PORT 2 LATCH CLK– PLL CIRCUITRY PLLVDD CLKVDD RESET LPF CLKCOM DIV0 DIV1 50 DB0 – DB9 MINI CIRCUITS T1-1T 1k 3.1V TO 3.5V HP8644 SIGNAL GENERATOR Figure 2. Basic AC Characterization Test Setup |
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