参数资料
型号: ADR280ARTZ-R2
厂商: Analog Devices Inc
文件页数: 7/12页
文件大小: 0K
描述: IC VREF SERIES PREC 1.2V SOT23-3
设计资源: 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145)
标准包装: 250
基准类型: 串联,精度
输出电压: 1.2V
容差: ±0.4%
温度系数: 40ppm/°C
输入电压: 2.4 V ~ 5.5 V
通道数: 1
电流 - 静态: 16µA
电流 - 输出: 100µA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: TO-236-3,SC-59,SOT-23-3
供应商设备封装: SOT-23-3
包装: 带卷 (TR)

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