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AD5363BCPZ データシート(PDF) 11 Page - Analog Devices |
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AD5363BCPZ データシート(HTML) 11 Page - Analog Devices |
11 / 25 page Preliminary Technical Data AD5362/AD5363 Rev. P rF | Page 11 of 25 TERMINOLOGY Relative Accuracy Relative accuracy, or endpoint linearity, is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is measured after adjusting for zero-scale error and full-scale error and is expressed in least significant bits (LSB). Differential Nonlinearity Differential nonlinearity 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. Zero-Scale Error Zero-scale error is the error in the DAC output voltage when all 0s are loaded into the DAC register. Zero-scale error is a measure of the difference between VOUT (actual) and VOUT (ideal) expressed in mV. Zero-scale error is mainly due to offsets in the output amplifier. Full-Scale Error Full-scale error is the error in DAC output voltage when all 1s are loaded into the DAC register. Full-scale error is a measure of the difference between VOUT (actual) and VOUT (ideal) expressed in mV. It does not include zero-scale error. Gain Error Gain error is the difference between full-scale error and zero-scale error. It is expressed in mV. Gain Error = Full-Scale Error − Zero-Scale Error VOUT Temperature Coefficient This includes output error contributions from linearity, offset, and gain drift. DC Output Impedance DC output impedance is the effective output source resistance. It is dominated by package lead resistance. DC Crosstalk The DAC outputs are buffered by op amps that share common VDD and VSS Vpower supplies. If the dc load current changes in one channel (due to an update), this can result in a further dc change in one or more channel outputs. This effect is more significant at high load currents and reduces as the load currents are reduced. With high impedance loads, the effect is virtually immeasurable. Multiple VDD and VSS terminals are provided to minimize dc crosstalk. Output Voltage Settling Time The amount of time it takes for the output of a DAC to settle to a specified level for a full-scale input change. Digital-to-Analog Glitch Energy The amount of energy injected into the analog output at the major code transition. It is specified as the area of the glitch in nV-s. It is measured by toggling the DAC register data between 0x1FFF and 0x2000. Channel-to-Channel Isolation Channel-to-channel isolation refers to the proportion of input signal from one DAC’s reference input that appears at the output of another DAC operating from another reference. It is expressed in dB and measured at midscale. DAC-to-DAC Crosstalk DAC-to-DAC crosstalk is the glitch impulse that appears at the output of one converter due to both the digital change and subsequent analog output change at another converter. It is specified in nV-s. Digital Crosstalk The glitch impulse transferred to the output of one converter due to a change in the DAC register code of another converter is defined as the digital crosstalk and is specified in nV-s. Digital Feedthrough When the device is not selected, high frequency logic activity on the device’s digital inputs can be capacitively coupled both across and through the device to show up as noise on the VOUT pins. It can also be coupled along the supply and ground lines. This noise is digital feedthrough. Output Noise Spectral Density Output noise spectral density is a measure of internally generated random noise. Random noise is characterized as a spectral density (voltage per √Hz). It is measured by loading all DACs to midscale and measuring noise at the output. It is measured in nV/(Hz) 1/2 |
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同様の説明 - AD5363BCPZ |
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