ADR280ART-REEL データシートの表示（PDF） - Analog Devices

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ADR280ART-REEL

1.2 V Ultralow Power High PSRR Voltage Reference

Analog Devices 

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.

ADR280

R1

Q1

R3

I1

R4

PNP3

Q3

Q17

Q18

Q9

R7

Q5

R5

R6

R8

R2

Q2

V+

R12

Q7

Q10

R13 C1

R10

Q6

VOUT

R11

R9

V–

Figure 11. Simplified Architecture

Rev. C | Page 7 of 12

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