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AD5024 Fiches technique(PDF) 17 Page - Analog Devices |
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AD5024 Fiches technique(HTML) 17 Page - Analog Devices |
17 / 28 page Data Sheet AD5024/AD5044/AD5064 Rev. F | Page 17 of 28 TERMINOLOGY Relative Accuracy (INL) For the DAC, relative accuracy, or integral nonlinearity (INL), is a measure of the maximum deviation in LSBs from a straight line passing through the endpoints of the DAC transfer function. Figure 8, Figure 9, and Figure 10 show plots of typical INL vs. code. Differential Nonlinearity (DNL) 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 monoto- nicity. This DAC is guaranteed monotonic by design. Figure 11, Figure 12, and Figure 13 show plots of typical DNL vs. code. Offset Error Offset error is a measure of the difference between the actual VOUT and the ideal VOUT, expressed in millivolts in the linear region of the transfer function. Offset error is calculated using a reduced code range—AD5064/AD5604-1: Code 512 to Code 65,024; AD5044: Code 128 to Code 16,256; AD5024: Code 32 to Code 4064, with output unloaded. Offset error can be negative or positive and is expressed in millivolts. 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 the ideal, expressed as a percentage of the full-scale range. Offset Error Temperature Coefficient Offset error temperature coefficient is a measure of the change in offset error with a change in temperature. It is expressed in microvolts per degree Celsius. Gain Temperature Coefficient Gain error drift is a measure of the change in gain error with changes in temperature. It is expressed in parts per million of full-scale range per degree Celsius. Full-Scale Error Full-scale error is a measure of the output error when full-scale code (0xFFFF) is loaded into the DAC register. Ideally, the output should be VREF − 1 LSB. Full-scale error is expressed as a percentage of the full-scale range. Measured with VREF < VDD. Digital-to-Analog Glitch Impulse Digital-to-analog glitch impulse is 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 nanovolt- seconds and is measured when the digital input code is changed by 1 LSB at the major carry transition (0x7FFF to 0x8000). See Figure 31. 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 decibels. VREF is held at 2.5 V, and VDD is varied by ±10%. Measured with VREF < VDD. 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. 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 per milliamp. 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. Digital Feedthrough Digital feedthrough is a measure of the impulse injected into the analog output of a DAC from the digital input pins of the device, but it is measured when the DAC is not being written to (SYNC held high). It is specified in nanovolt-seconds and measured with one simultaneous data and clock pulse loaded to the DAC. Digital Crosstalk Digital crosstalk is the glitch impulse transferred to the output of one DAC at midscale in response to a full-scale code change (all 0s to all 1s or vice versa) in the input register of another DAC. It is measured in standalone mode and is expressed in nanovolt-seconds. Analog Crosstalk Analog crosstalk is the glitch impulse transferred to the output of one DAC due to a change in the output of another DAC. It is measured by loading one of the input registers with a full-scale code change (all 0s to all 1s or vice versa) while keeping LDAC high, and then pulsing LDAC low and monitoring the output of the DAC whose digital code has not changed. The area of the glitch is expressed in nanovolt-seconds. |
Numéro de pièce similaire - AD5024 |
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Description similaire - AD5024 |
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