ADR280ARTZ-R21 datasheet(7/12 Pages) AD

부품명	ADR280ARTZ-R21

상세설명	1.2 V Ultralow Power High PSRR Voltage Reference

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제조업체	AD [Analog Devices]

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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.

Q17

Q18

PNP3

R12

Q10

R13

R10

R11

V–

V+

VOUT

Figure 11. Simplified Architecture

ADR280ARTZ-R21 데이터시트(PDF) 7 Page - Analog Devices