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AD664AD-UNI Datenblatt(PDF) 5 Page - Analog Devices |
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AD664AD-UNI Datenblatt(HTML) 5 Page - Analog Devices |
5 / 23 page AD664 REV. –5– Table I. Transfer Functions Mode = UNI Mode = BIP 000000000000 = 0 V 000000000000 = – VREF/2 Gain = 1 100000000000 = VREF/2 100000000000 = 0 V 111111111111 = VREF – 1 LSB 111111111111 = VREF/2 –1 LSB 000000000000 = 0 V 000000000000 = VREF Gain = 2 100000000000 = VREF 100000000000 = 0 V 111111111111 = 2 × V REF – 1 LSB 111111111111 = +VREF – 1 LSB DEFINITIONS OF SPECIFICATIONS LINEARITY ERROR: Analog Devices defines linearity error 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. The AD664 is laser-trimmed to typically maintain linearity errors at less than ±1/4 LSB. MONOTONICITY: A DAC is said to be monotonic if the out- put either increases or remains constant for increasing digital inputs such that the output will always be a nondecreasing func- tion of input. All versions of the AD664 are monotonic over their full operating temperature range. DIFFERENTIAL LINEARITY: Monotonic behavior requires that the differential linearity error be less than 1 LSB both at 25 °C as well as over the temperature range of interest. Differen- tial nonlinearity is the measure of the variation in analog value, normalized to full scale, associated with a 1 LSB change in digi- tal input code. For example, for a 10 V full-scale output, a change of 1 LSB in digital input code should result in a 2.44 mV change in the analog output (VREF = 10 V, Gain = 1, 1 LSB = 10 V × 1/4096 = 2.44 mV). If in actual use, however, a 1 LSB change in the input code results in a change of only 0.61 mV (1/4 LSB) in analog output, the differential non- linearity error would be –1.83 mV, or –3/4 LSB. GAIN ERROR: DAC gain error is a measure of the difference between the output span of an ideal DAC and an actual device. UNIPOLAR OFFSET ERROR: Unipolar offset error is the dif- ference between the ideal output (0 V) and the actual output of a DAC when the input is loaded with all “0s” and the MODE is unipolar. BIPOLAR ZERO ERROR: Bipolar zero error is the difference between the ideal output (0 V) and the actual output of a DAC when the input code is loaded with the MSB = “1” and the rest of the bits = “0” and the MODE is bipolar. SETTLING TIME: Settling time is the time required for the output to reach and remain within a specified error band about its final value, measured from the digital input transition. CROSSTALK: Crosstalk is the change in an output caused by a change in one or more of the other outputs. It is due to capacitive and thermal coupling between outputs. REFERENCE FEEDTHROUGH: The portion of an ac refer- ence signal that appears at an output when all input bits are low. Feedthrough is due to capacitive coupling between the reference input and the output. It is specified in decibels at a particular frequency. REFERENCE 3 dB BANDWIDTH: The frequency of the ac reference input signal at which the amplitude of the full-scale output response falls 3 dB from the ideal response. GLITCH IMPULSE: Glitch impulse is an undesired output voltage transient caused by asymmetrical switching times in the switches of a DAC. These transients are specified by their net area (in nV-sec) of the voltage vs. time characteristic. PIN CONFIGURATIONS 28-Pin DIP Package 44-Pin Package D |
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