参数资料
| 型号： | ADR370BRT-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC SOT-23-3 |
| 标准包装： | 1 |
| 基准类型： | 串联，精度 |
| 输出电压： | 2.048V |
| 容差： | ±0.2% |
| 温度系数： | 50ppm/°C |
| 输入电压： | 2.3 V ~ 15 V |
| 通道数： | 1 |
| 电流 - 静态： | 72µA |
| 电流 - 输出： | 5mA |
| 工作温度： | -40°C ~ 125°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： | 剪切带 (CT) |
| 其它名称： | ADR370BRT-R2CT |
ADR370
THEORY OF OPERATION
The ADR370 uses the band gap concept to produce a stable,
low temperature coefficient voltage reference suitable for high
accuracy data acquisition components and systems. This device
makes use of the underlying temperature characteristics of a
silicon transistor’s base-emitter voltage (V BE ) in the forward-
biased operating region. Under this condition, all such transistors
have a ?2 mV/°C temperature coefficient (TC) and a V BE that,
when extrapolated to absolute zero, 0 K, (with collector current
proportional to absolute temperature), approximate the silicon
band gap voltage. By summing a voltage that has an equal and
opposite temperature coefficient of 2 mV/°C with a V BE of a
forward-biased transistor, an almost zero TC reference can be
developed. The simplified circuit diagram in Figure 12 shows
how a compensating voltage, V1, is achieved by driving two
transistors at different current densities and amplifying the
APPLYING THE ADR370
To achieve the specified performance, two external components
should be used in conjunction with the ADR370: a 4.7 μF capa-
citor and a 1 μF capacitor. The 4.7 μF capacitor should be applied
to the input, and the 1 μF capacitor should be applied to the
output. Figure 13 shows the ADR370 with both the input and
output capacitors attached.
For further transient response optimization, an additional 0.1 μF
capacitor in parallel with the 4.7 μF input capacitor can be used.
A 1 μF output capacitor provides stable performance for all
loading conditions. The ADR370 can, however, operate under
low (?100 μA < I OUT < +100 μA) current conditions with just
a 0.2 μF output capacitor and a 1 μF input capacitor.
resulting V BE difference (ΔV BE , which has a positive TC). The
sum (V BG ) of V BE and V1 is then buffered and amplified to
produce a stable reference voltage of 2.048 V at the output.
V IN
C IN
4.7μF
C OUT
1μF
V IN
ADR370
GND
V OUT
R3
R2
R4
R5
V DS
R6
V OUT
Figure 13. Typical Connection Diagram
R1
V1
Figure 12. Simplified Schematic
GND
Rev. C | Page 8 of 12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADR370BRT-REEL7 | 制造商:Rochester Electronics LLC 功能描述:+4.096V REFERENCE - Tape and Reel 制造商:Analog Devices 功能描述: |
| ADR370BRTZ-REEL | 制造商:Rochester Electronics LLC 功能描述: |
| ADR370BRTZ-REEL7 | 功能描述:IC VREF SERIES PREC SOT-23-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:1 系列:- 基准类型:串联，精度 输出电压:4.5V 容差:±800µV 温度系数:1ppm/°C 输入电压:13.5 V ~ 22 V 通道数:1 电流 - 阴极:- 电流 - 静态:7mA 电流 - 输出:10mA 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:20-LCC 供应商设备封装:20-CLCC 包装:管件 |
| ADR380 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Low-Drift 2.048 V/2.500 V SOT-23 Voltage References |
| ADR380ART | 制造商:Analog Devices 功能描述:Voltage Reference, Fixed, 2.048V, 3 Pin, Plastic, TO-236 |
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