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| 型号： | ADR423BRZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 3V 8-SOIC |
| 设计资源： | 40 Channels of Programmable Output Span Using AD5371 (CN0149) |
| 标准包装： | 1,000 |
| 系列： | XFET® |
| 基准类型： | 串联，精度 |
| 输出电压： | 3V |
| 容差： | ±0.04% |
| 温度系数： | 3ppm/°C |
| 输入电压： | 5 V ~ 18 V |
| 通道数： | 1 |
| 电流 - 静态： | 500µA |
| 电流 - 输出： | 10mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
Data Sheet
KELVIN CONNECTIONS
In many portable instrumentation applications where PC board
cost and area are important considerations, circuit intercon-
nects are often narrow. These narrow lines can cause large
voltage drops if the voltage reference is required to provide load
currents to various functions. In fact, a circuit’s interconnects
ADR420/ADR421/ADR423/ADR425
DUAL-POLARITY REFERENCES
Dual-polarity references can easily be made with an op amp and
a pair of resistors. In order not to defeat the accuracy obtained
by the ADR42x, it is imperative to match the resistance toler-
ance and the temperature coefficient of all components.
V IN
can exhibit a typical line resistance of 0.45 m?/square (1 oz. Cu,
for example). Force and sense connections, also referred to as
Kelvin connections, offer a convenient method of eliminating
1μF
0.1μF
2
V IN
U1
V OUT 6
R1
10k ?
R2
10k ?
+5V
the effects of voltage drops in circuit wires. Load currents flow-
ADR425
+10V
ing through wiring resistance produce an error (V ERROR = R × I L )
overcomes the problem by including the wiring resistance
within the forcing loop of the op amp. Because the op amp
senses the load voltage, op amp loop control forces the output to
GND
4
TRIM 5
R3
5k ?
V+
U2
OP1177
V–
–10V
–5V
compensate for the wiring error and to produce the correct
voltage at the load.
V IN
2
Figure 44. +5 V and ?5 V Reference Using ADR425
+2.5V
+10V
ADR420/
ADR421/
ADR423/
ADR425
V OUT 6
R LW
V IN
R LW
A1
V OUT
SENSE
V OUT
FORCE
2
V IN V OUT 6
U1
ADR425
R1
5.6k ?
GND
4
A1 = OP191
R L
GND
4
TRIM 5
R2
5.6k ?
V+
Figure 43. Advantage of Kelvin Connection
–2.5V
U2
OP1177
V–
–10V
Figure 45. +2.5 V and ?2.5 V Reference Using ADR425
Rev. J | Page 19 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADR425 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References |
| ADR425AR | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 10mA 8-Pin SOIC N Tube 制造商:Rochester Electronics LLC 功能描述:5.0 VOLTAGE REFERENCE - Bulk 制造商:Analog Devices 功能描述:Voltage Regulator IC Voltage Regulator T |
| ADR425ARM | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 10mA 8-Pin MSOP Tube 制造商:Rochester Electronics LLC 功能描述:5.0 VOLTAGE REFERENCE - Bulk |
| ADR425ARMREEL7 | 制造商:AD 功能描述:New |
| ADR425ARM-REEL7 | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 10mA 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:5.0 VOLTAGE REFERENCE - Tape and Reel |
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