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參數資料
| 型號： | ADR280ART-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.2 V Ultralow Power High PSRR Voltage Reference |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 1.2 V, PDSO3 |
| 封裝： | ROHS COMPLIANT, TO-236AB, SOT-23, 3 PIN |
| 文件頁數： | 4/8頁 |
| 文件大小： | 498K |
| 代理商： | ADR280ART-R2 |
ADR280
–4–
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 their Vbes produces
a PTAT (proportional to absolute temperature) voltage that
cancels the CTAT (complementary to absolute temperature) 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 2). Preci-
sion laser trimming of the internal resistors and other proprietary
circuit techniques are used to enhance the initial accuracy, tem-
perature 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+
V
OUT
I1
Figure 2. Simplified Architecture
t
S
1.2
1.0
0.8
0.6
0.4
0.2
0
2
4
6
8
10
12
14
16
18
20
0
V
TIME (ms)
TPC 7. Settling Time
APPLICATIONS
The ADR280 should be decoupled with a 0.1 μF ceramic cap at
the output for optimum stability. It is also good practice to
include 0.1 μF ceramic caps at the IC supply pin. These capaci-
tors should be mounted close to their respective pins (see Figure 3).
V+
V
OUT
0.1
F
0.1
F
V–
ADR280
Figure 3. Basic Configuration
The low supply voltage input pin V– can be elevated above
ground; a 1.2 V differential voltage can therefore be established
above V– (see Figure 4).
V+
V
OUT
0.1
F
0.1
F
V–
ADR280
5V
1.2V
2.5V
Figure 4. Floating References
REV. A
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADR280ART-REEL | 制造商:Analog Devices 功能描述: |
| ADR280ART-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADR280ARTZ | 制造商:UNBRANDED 功能描述:IC VREF LOW POWER 1.2V SOT23 *NIC* |
| ADR280ARTZ-R2 | 功能描述:IC VREF SERIES PREC 1.2V SOT23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 產品培訓模塊:Voltage Reference Basics 標準包裝:100 系列:- 基準類型:旁路，精度 輸出電壓:4.096V 容差:±0.075% 溫度系數:50ppm/°C 輸入電壓:- 通道數:1 電流 - 陰極:1µA 電流 - 靜態:- 電流 - 輸出:10mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:管件 |
| ADR280ARTZ-R2 | 制造商:Analog Devices 功能描述:IC SERIES V-REF 1.2V 5mV 3-SOT-23 制造商:Analog Devices 功能描述:IC, SERIES V-REF, 1.2V, 5mV, 3-SOT-23 |
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