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AD9761 数据表(PDF) 7 Page - Analog Devices |
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AD9761 数据表(HTML) 7 Page - Analog Devices |
7 / 24 page AD9761 –6– AD9761 –7– 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 (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 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. Channel Isolation Channel Isolation is a measure of the level of crosstalk between channels. It is measured by producing a full-scale 8 MHz signal output for one channel and measuring the leakage into the other channel. 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 sum of the rms value of the first six harmonic components to the rms value of the measured output signal. It is expressed as a percentage or in decibels (dB). Signal-to-Noise and Distortion (S/N+D, SINAD) Ratio S/N+D 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, including harmonics but excluding dc.The value for S/N+D is expressed in decibels. Effective Number of Bits (ENOB) For a sine wave, SINAD can be expressed in terms of the number of bits. Using the following formula, N = (SINAD – 1.76)/6.02 it is possible to get a measure of performance expressed as N, the effective number of bits. Thus, effective number of bits for a device for sine wave inputs at a given input frequency can be calculated directly from its measured SINAD. Pass Band Frequency band in which any input applied therein passes unattenuated to the DAC output. 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. 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. REV. C REV. C |
类似零件编号 - AD9761_15 |
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类似说明 - AD9761_15 |
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