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AD5663RBRMZ-3REEL7 Datasheet(PDF) 18 Page - Analog Devices |
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AD5663RBRMZ-3REEL7 Datasheet(HTML) 18 Page - Analog Devices |
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18 / 32 page  AD5623R/AD5643R/AD5663R Data Sheet Rev. F | Page 18 of 32 TERMINOLOGY Relative Accuracy or Integral Nonlinearity (INL) For the DAC, relative accuracy or integral nonlinearity is a measurement of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. A typical INL vs. code plot is shown in Figure 5. Differential Nonlinearity (DNL) Differential nonlinearity (DNL) is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures monotonicity. This DAC is guaranteed monotonic by design. A typical DNL vs. code plot is shown in Figure 9. Zero-Scale Error Zero-scale error is the measurement of the output error when zero code (0x0000) is loaded to the DAC register. Ideally, the output should be 0 V. The zero-scale error is always positive in the AD56x3R because the output of the DAC cannot go below 0 V. It is due to a combination of the offset errors in the DAC and the output amplifier. Zero-scale error is expressed in mV. A plot of zero-scale error vs. temperature is shown in Figure 26. Full-Scale Error Full-scale error is the measurement of the output error when full-scale code (0xFFFF) is loaded into the DAC register. Ideally, the output should be VDD − 1 LSB. Full-scale error is expressed in percent of full-scale range. A plot of full-scale error vs. temperature is shown in Figure 25. Gain Error Gain error is a measure of the span error of the DAC. It is the deviation in slope of the DAC transfer characteristic from ideal, expressed as a percent of the full-scale range. Zero-Scale Error Drift Zero-scale error drift is the measurement of the change in zero- scale error with a change in temperature. It is expressed in microvolts/°C (µV/°C). Gain Temperature Coefficient Gain temperature coefficient is a measurement of the change in gain error with changes in temperature. It is expressed in (ppm of full-scale range)/°C. Offset Error Offset error is a measure of the difference between VOUT (actual) and VOUT(ideal) expressed in mV in the linear region of the transfer function. Offset error is measured on the AD56x3R with code 512 loaded in the DAC register. It can be negative or positive. DC Power Supply Rejection Ratio (PSRR) PSRR indicates how the output of the DAC is affected by changes in the supply voltage. PSRR is the ratio of the change in VOUT to a change in VDD for full-scale output of the DAC. It is measured in dB. VREF is held at 2 V, and VDD is varied by ±10%. Output Voltage Settling Time Output voltage settling time is the amount of time it takes for the output of a DAC to settle to a specified level for a 1/4 to 3/4 full-scale input change and is measured from the 24th falling edge of SCLK. Digital-to-Analog Glitch Impulse The impulse injected into the analog output when the input code in the DAC register changes state. It is normally specified as the area of the glitch in nV-s and is measured when the digital input code is changed by 1 LSB at the major carry transition (0x7FFF to 0x8000). See Figure 38. Digital Feedthrough A measure of the impulse injected into the analog output of the DAC from the digital inputs of the DAC, digital feedthrough is measured when the DAC output is not updated. It is specified in nV-s, and it is measured with a full-scale code change on the data bus, that is, from all 0s to all 1s and vice versa. Reference Feedthrough Reference feedthrough is the ratio of the amplitude of the signal at the DAC output to the reference input when the DAC output is not being updated (that is, LDAC is high). It is expressed in decibels (dB). Noise Spectral Density Noise spectral density is a measurement of the internally generated random noise. Random noise is characterized as a spectral density (nV/√Hz). It is measured by loading the DAC to midscale and measuring noise at the output. A plot of noise spectral density is shown in Figure 44. DC Crosstalk DC crosstalk is the dc change in the output level of one DAC in response to a change in the output of another DAC. It is measured with a full-scale output change on one DAC (or soft power-down and power-up) while monitoring another DAC kept at midscale. It is expressed in microvolts (μV). DC crosstalk due to load current change is a measure of the impact that a change in load current on one DAC has to another DAC kept at midscale. It is expressed in microvolts/ milliamps (μV/mA). |
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