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| 型号： | ADR280AKSZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 1.2V SC-70-3 |
| 设计资源： | 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145) |
| 标准包装： | 1 |
| 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： | SC-70，SOT-323 |
| 供应商设备封装： | SC-70-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 795 (CN2011-ZH PDF) |
| 其它名称： | ADR280AKSZ-REEL7DKR |
ADR280
APPLICATIONS INFORMATION
The ADR280 should be decoupled with a 0.1 μF ceramic
U1
capacitor at the output for optimum stability. It is also good
practice to include 0.1 μF ceramic capacitors at the IC supply
pin. These capacitors should be mounted close to their
respective pins (see Figure 12).
5V
5V
V+
ADR280
V–
V+
0.1μF
V+
ADR280
V–
V O
1.8V
R2
60k ? ± 0.1%
C2
2.2pF
U2
+
AD8541
V– –
1.2V
C1
0.1μF
V OUT
V OUT
R1
120k ? ± 0.1%
0.1μF
Figure 15. 1.8 V Reference
Figure 12. 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 13).
LOW COST, LOW POWER CURRENT SOURCE
Because of its low power characteristics, the ADR280 can be
converted to a current source with just a setting resistor. In
addition to the ADR280 current capability, the supply voltage
5V
V+
0.1μF
ADR280
V–
2.5V
produces 100 μA with 2 V compliance at a 5 V supply. The load
current is the sum of I SET and I GND . I GND increases slightly with
load; a R SET of 13.6 kΩ yields 100 μA of load current.
1.2V + V–
0.1μF
V OUT
5V
U1
V+
ADR280
Figure 13. Floating References
V–
R SET +
– 13.6k ?
The ADR280 provides the core 1.2 V band gap voltage and is
able to drive a maximum load of only 100 μA. Users can simply
buffer the output for high current or sink/source current applica-
tions, such as ADC or LCD driver references (see Figure 14).
U1
V+
1.2V
1k ? 100μA
I SET
C1
0.1μF
RL I L
V OUT
I GND
I L = I SET + I GND
0.1μF
ADR280
V–
Figure 16. Low Cost Current Source
Precision Low Power Current Source
By adding a buffer to redirect the I GND in Figure 17, a current
V OUT
U2
0.1μF
V OUT
U2 = AD8541, SC70
AD8601, SOT-23-5
can be precisely set by R SET with the equation I L = 1.2 V/ R SET .
U1
5V
V+
Figure 14. Buffered Output
Users can also tailor any specific need for voltage and dynamics
and Figure 15). Depending on the specific op amp and PCB
layout, it may be necessary to add a compensation capacitor, C2,
ADR280
V–
V OUT
C2
0.1μF
V+
+
to prevent gain peaking and oscillation. The exact value of C2
needed requires some trial and error but usually falls in the
range of a few picofarads.
R SET
12k ?
RL
1k ?
5V
– U2
AD8541
V–
I L
100μA
I L = 1.2V/R SET
Figure 17. Precision Low Power Current Source
Rev. C | Page 8 of 12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADR280AKSZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:1.2 V Ultralow Power High PSRR Voltage Reference |
| ADR280ART-R2 | 功能描述:IC VREF SERIES PREC 1.2V SOT23-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:5V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:80µA 电流 - 静态:- 电流 - 输出:15mA 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) 其它名称:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
| 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* |
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