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ADR280ART-REEL Scheda tecnica(PDF) 7 Page - Analog Devices |
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ADR280ART-REEL Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 12 page ADR280 Rev. C | Page 7 of 12 THEORY OF OPERATION The ADR280 provides the basic core 1.2 V band gap reference. It contains two NPN transistors, Q9 and Q17, with their emitter areas scaled in a fixed ratio. The difference in the VBE produces a proportional to absolute temperature (PTAT) voltage that cancels the complementary to absolute temperature (CTAT) Q9 VBE voltage. As a result, a core band gap voltage that is almost a constant 1.2 V over temperature is generated (see Figure 11). Precision laser trimming of the internal resistors and other proprietary circuit techniques are used to enhance the initial accuracy, temperature curvature, and temperature drift performance. R1 R3 R5 R7 R9 Q17 Q9 Q18 R8 Q3 R6 Q5 Q6 R4 Q1 PNP3 R2 R12 Q2 Q10 R13 C1 Q7 R10 R11 V– V+ I1 VOUT Figure 11. Simplified Architecture |
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