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AD660ARZ-REEL1 Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD660ARZ-REEL1 Scheda tecnica(HTML) 9 Page - Analog Devices |
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9 / 20 page  AD660 Rev. B | Page 9 of 20 TERMINOLOGY Integral Nonlinearity Integral nonlinearity is the maximum deviation of the actual, adjusted DAC output from the ideal analog output (a straight line drawn from 0 to FS − 1 LSB) for any bit combination. This is also referred to as relative accuracy. Differential Nonlinearity Differential nonlinearity is the measure of the change in the analog output, normalized to full scale, associated with a 1 LSB change in the digital input code. Monotonic behavior requires that the differential linearity error be greater than or equal to −1 LSB over the temperature range of interest. Monotonicity A DAC is monotonic if the output either increases or remains constant for increasing digital inputs with the result that the output is always a single-valued function of the input. Gain Error Gain error is a measure of the output error between an ideal DAC and the actual device output with all 1s loaded after offset error has been adjusted out. Offset Error Offset error is a combination of the offset errors of the voltage- mode DAC and the output amplifier and is measured with all 0s loaded in the DAC. Bipolar Zero Error When the AD660 is connected for bipolar output and 10…000 is loaded in the DAC, the deviation of the analog output from the ideal midscale value of 0 V is called the bipolar zero error. Drift Drift is the change in a parameter (such as gain, offset, and bipolar zero) over a specified temperature range. The drift temperature coefficient, specified in ppm/°C, is calculated by measuring the parameter at TMIN, 25°C, and TMAX, and dividing the change in the parameter by the corresponding temperature change. Total Harmonic Distortion + Noise Total harmonic distortion + noise (THD + N) is defined as the ratio of the square root of the sum of the squares of the values of the harmonics and noise to the value of the fundamental input frequency. It is usually expressed in percent (%). THD + N is a measure of the magnitude and distribution of linearity error, differential linearity error, quantization error, and noise. The distribution of these errors may be different, depending upon the amplitude of the output signal. Therefore, to be the most useful, THD + N should be specified for both large and small signal amplitudes. Signal-To-Noise Ratio The signal-to-noise ratio is the ratio of the amplitude of the output when a full-scale signal is present to the output with no signal present. The signal-to-noise ratio is measured in decibels (dB). Digital-To-Analog Glitch Impulse Digital-to-analog glitch impulse is the amount of charge injected from the digital inputs to the analog output when the inputs change state. This is measured at half scale when the DAC switches around the MSB and as many as possible switches change state, that is, from 011…111 to 100…000. Digital Feedthrough When the DAC is not selected (that is, CS is held high), high frequency logic activity on the digital inputs is capacitively coupled through the device to show up as noise on the VOUT pin. This noise is digital feedthrough. |
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