Datenblatt-Suchmaschine für elektronische Bauteile |
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AD7521JN Datenblatt(PDF) 10 Page - National Semiconductor (TI) |
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AD7521JN Datenblatt(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Definition of Terms Resolution Resolution is defined as the reciprocal of the number of discrete steps in the DA output It is directly related to the number of switches or bits within the DA For example the DAC1020 has 210 or 1024 steps while the DAC1220 has 212 or 4096 steps Therefore the DAC1020 has 10-bit resolution while the DAC1220 has 12-bit resolu- tion Linearity Error Linearity error is the maximum deviation from a straight line passing through the endpoints of the DA transfer characteristic It is measured after calibrating for zero (see VOS adjust in typical applications) and full- scale Linearity error is a design parameter intrinsic to the device and cannot be externally adjusted Power Supply Sensitivity Power supply sensitivity is a measure of the effect of power supply changes on the DA full-scale output Settling Time Full-scale settling time requires a zero to full- scale or full-scale to zero output change Settling time is the time required from a code transition until the DA output reaches within g LSB of final output value Full-Scale Error Full-scale error is a measure of the output error between an ideal DA and the actual device output Ideally for the DAC1020 full-scale is VREFb1 LSB For VREFe10V and unipolar operation VFULL-SCA- LE e 100000V98 mVe99902V Full-scale error is ad- justable to zero as shown in Figure 5 TLH5689 – 10 ab1 b2 (a) End point test after zero and full-scale adjust The DAC has 1 LSB linearity error (b) By shifting the full-scale calibration on of the DAC of Figure (b1) we could pass the ‘‘best straight line’’ (b2) test and meet the g linearity error specification Note (a) (b1) and (b2) above illustrate the difference between ‘‘end point’’ National’s linearity test (a) and ‘‘best straight line’’ test Note that both devices in (a) and (b2) meet the g LSB linearity error specification but the end point test is a more ‘‘real life’’ way of characterizing the DAC Connection Diagrams DAC102X Dual-In-Line Package TLH5689 – 13 DAC1020 PLCC Package TLH5689 – 12 DAC122X Dual-In-Line Package TLH5689 – 11 http www nationalcom 10 |
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Ähnliche Beschreibung - AD7521JN |
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