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AD7245AAQ Arkusz danych(PDF) 4 Page - Analog Devices |
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4 / 16 page AD7245A/AD7248A REV. A –4– DAC GAIN ERROR DAC Gain Error is a measure of the output error between an ideal DAC and the actual device output with all 1s loaded after offset error has been allowed for. It is, therefore defined as: Measured Value—Offset—Ideal Value where the ideal value is calculated relative to the actual refer- ence value. UNIPOLAR OFFSET ERROR Unipolar Offset Error is a combination of the offset errors of the voltage mode DAC and the output amplifier and is measured when the part is configured for unipolar outputs. It is present for all codes and is measured with all 0s in the DAC register. BIPOLAR ZERO OFFSET ERROR Bipolar Zero Offset Error is measured when the part is config- ured for bipolar output and is a combination of errors from the DAC and output amplifier. It is present for all codes and is measured with a code of 2048 (decimal) in the DAC register. SINGLE SUPPLY LINEARITY AND GAIN ERROR The output amplifier of the AD7245A/AD7248A can have a true negative offset even when the part is operated from a single positive power supply. However, because the lower supply rail to the part is 0 V, the output voltage cannot actually go nega- tive. Instead the output voltage sits on the lower rail and this re- sults in the transfer function shown. This is an offset effect and the transfer function would have followed the dotted line if the output voltage could have gone negative. Normally, linearity is measured after offset and full scale have been adjusted or al- lowed for. On the AD7245A/AD7248A the negative offset is al- lowed for by calculating the linearity from the code which the amplifier comes off the lower rail. This code is given by the negative offset specification. For example, the single supply lin- earity specification applies between Code 3 and Code 4095 for the 25 °C specification and between Code 5 and Code 4095 over the TMIN to TMAX temperature range. Since gain error is also measured after offset has been allowed for, it is calculated between the same codes as the linearity error. Bipolar linearity and gain er- ror are measured between Code 0 and Code 4095. OUTPUT VOLTAGE NEGATIVE OFFSET DAC CODE 0V { TERMINOLOGY RELATIVE ACCURACY Relative Accuracy, or end-point nonlinearity, is a measure of the actual deviation from a straight line passing through the end- points of the DAC transfer function. It is measured after allow- ing for zero and full scale and is normally expressed in LSBs or as a percentage of full-scale reading. 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 max over the operating temperature range ensures monotonicity. DIGITAL FEEDTHROUGH Digital Feedthrough is the glitch impulse injected from the digi- tal inputs to the analog output when the inputs change state. It is measured with LDAC high and is specified in nV-s. AD7245A ORDERING GUIDE Temperature Relative Package Modell Range Accuracy Option2 AD7245AAN –40 °C to +85°C ±3/4 LSB N-24 AD7245ABN –40 °C to +85°C ±1/2 LSB N-24 AD7245AAQ –40 °C to +85°C ±3/4 LSB Q-24 AD7245ATQ 3 –55 °C to +125°C ±3/4 LSB Q-24 AD7245AAP –40 °C to +85°C ±3/4 LSB P-28A AD7245AAR –40 °C to +85°C ±3/4 LSB R-24 AD7245ABR –40 °C to +85°C ±1/2 LSB R-24 AD7245ATE3 –55 °C to +125°C ±3/4 LSB E-28A NOTES 1To order MIL-STD-883, Class B. processed parts, add /883B to part number. Contact our local sales office for military data sheet and availability. 2E = Leadless Ceramic Chip Carrier; N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = SOIC. 3This grade will be available to /883B processing only. AD7248A ORDERING GUIDE Temperature Relative Package Model l Range Accuracy Option 2 AD7248AAN –40 °C to +85°C ±3/4 LSB N-20 AD7248ABN –40 °C to +85°C ±1/2 LSB N-20 AD7248AAQ –40 °C to +85°C ±3/4 LSB Q-20 AD7248ATQ 3 –55 °C to +125°C ±3/4 LSB Q-20 AD7248AAP –40 °C to +85°C ±3/4 LSB P-20A AD7248AAR –40 °C to +85°C ±3/4 LSB R-20 AD7248ABR –40 °C to +85°C ±1/2 LSB R-20 NOTES 1To order MIL-STD-883, Class B, processed parts, add /883B to part number. Contact our local sales office for military data sheet and availability. 2N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = SOIC. 3This grade will be available to /883B processing only. |
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