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AD9740-EB Datasheet(PDF) 9 Page - Analog Devices |
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AD9740-EB Datasheet(HTML) 9 Page - Analog Devices |
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9 / 32 page  AD9740 Rev. B | Page 9 of 32 TERMINOLOGY 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 DAC 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 the 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 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 °C. For reference drift, the drift is reported in ppm per °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 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. T T otal Harmonic Distortion (THD) THD is the ratio of the rms sum of the first six harmonic components to the rms value of the measured input signal. It is expressed as a percentage or in decibels (dB). Multitone Power Ratio The spurious-free dynamic range containing multiple carrier tones of equal amplitude. It is measured as the difference between the rms amplitude of a carrier tone to the peak spurious signal in the region of a removed tone. 150pF 1.2V REF AVDD ACOM REFLO PMOS CURRENT SOURCE ARRAY SEGMENTED SWITCHES FOR DB9–DB1 LSB SWITCHES REFIO FS ADJ DVDD DCOM CLOCK 3.3V RSET 2k Ω 0.1 μF DVDD DCOM IOUTA IOUTB AD9740 SLEEP 50 Ω RETIMED CLOCK OUTPUT* LATCHES DIGITAL DATA TEKTRONIX AWG-2021 WITH OPTION 4 LECROY 9210 PULSE GENERATOR CLOCK OUTPUT 50 Ω ROHDE & SCHWARZ FSEA30 SPECTRUM ANALYZER MINI-CIRCUITS T1-1T *AWG2021 CLOCK RETIMED SO THAT THE DIGITAL DATA TRANSITIONS ON FALLING EDGE OF 50% DUTY CYCLE CLOCK. 3.3V MODE 50 Ω Figure 5. Basic AC Characterization Test Setup (SOIC/TSSOP Packages) |
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