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MAX5491UA07538-T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX5491UA07538-T Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 7 page Applications Information Self-Heating and Error Applying a voltage across terminals P1 and P2 causes the device to heat up due to power dissipation. In high- voltage applications, consider the error in resistance- ratio temperature coefficient caused by self-heating. The worst-case self-heating occurs when the operating voltage attains its maximum value. Approximate the result of power dissipation under this condition as: The thermal resistance from junction to ambient, θJ-A, for a 3-pin SOT23 package is 141°C/W. Calculate the resulting temperature rise as: ∆T = 83.3mW x 141°C/W = 11.7°C If the ratio temperature coefficient is 2ppm/°C (typ), the total error introduced by self-heating is: 11.7 °C x 2ppm/°C = 23.4ppm P V R V k mW DISS MAX . = () = () = 22 50 30 83 3 Ω Precision-Matched Resistor-Divider in SOT23 4 _______________________________________________________________________________________ IN P1 P2 P3 MAX5491 R2 R1 OUT Figure 3. Buffered Attenuator MAX5491 R2 R1 P1 P2 P3 IN OUT Figure 1. Inverting Amplifier Configuration P1 P2 P3 MAX5491 R2 R1 OUT IN Figure 4. Attenuator with Buffer MAX5491 R2 R1 P1 P2 P3 IN OUT Figure 2. Noninverting Amplifier Configuration A V V R R OUT IN == − 1 2 A V V R R OUT IN == + 1 1 2 A V V R RR OUT IN == + 2 12 A V V R RR OUT IN == + 2 12 Typical Applications |
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