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AD660 Datasheet(PDF) 5 Page - Analog Devices |
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AD660 Datasheet(HTML) 5 Page - Analog Devices |
5 / 12 page AD660 REV. A –5– VALID 1 VALID 16 BIT0 SER LDAC t DS CS t LO t HI t CLK t SH t LW t LH t DH t SS BIT1 "1" = MSB FIRST, "0" = LSB FIRST Figure 1b. AD660 Serial Load Timing CLR LBE t SET t HOLD "1" = BIP 0, "0" = UNI 0 t CLR Figure 1c. Asynchronous Clear to Bipolar or Unipolar Zero VALID 16 VALID 17 BIT0 SER BIT 1 (MSB/LSB) CS t DS t PROP VALID S OUT 1 SERIAL OUT Figure 1d. Serial Out Timing DEFINITIONS OF SPECIFICATIONS INTEGRAL NONLINEARITY: Analog Devices defines integral nonlinearity as 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 will always be a single-valued function of the input. GAIN ERROR: Gain error is a measure of the output error be- tween 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 devia- tion 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 T MAX and dividing the change in the parameter by the corresponding temperature change. TOTAL HARMONIC DISTORTION + NOISE: Total har- monic distortion + noise (THD+N) is defined as the ratio of the square root of the sum of the squares of the values of the har- monics and noise to the value of the fundamental input fre- quency. It is usually expressed in percent (%). THD+N is a measure of the magnitude and distribution of lin- earity error, differential linearity error, quantization error and noise. The distribution of these errors may be different, depend- ing 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. |
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