REF1941
- Two Outputs, VREF and VREF / 2, for Convenient Use in Single-Supply Systems
- Excellent Temperature Drift Performance:
- 25 ppm/°C (max) from –40°C to 125°C
- High Initial Accuracy: ±0.1% (max)
- VREF and VBIAS Tracking over Temperature:
- 6 ppm/°C (max) from –40°C to 85°C
- 7 ppm/°C (max) from –40°C to 125°C
- Microsize Package: SOT23-5
- Low Dropout Voltage: 10 mV
- High Output Current: ±20 mA
- Low Quiescent Current: 360 µA
- Line Regulation: 3 ppm/V
- Load Regulation: 8 ppm/mA
Applications with only a positive supply voltage often require an additional stable voltage in the middle of the analog-to-digital converter (ADC) input range to bias input bipolar signals. The REF19xx provides a reference voltage (VREF) for the ADC and a second highly-accurate voltage (VBIAS) that can be used to bias the input bipolar signals.
The REF19xx offers excellent temperature drift (25 ppm/°C, max) and initial accuracy (0.1%) on both the VREF and VBIAS outputs while operating at a quiescent current less than 430 µA. In addition, the VREF and VBIAS outputs track each other with a precision of 6 ppm/°C (max) across the temperature range of –40°C to 85°C. All these features increase the precision of the signal chain and decrease board space, while reducing the cost of the system as compared to a discrete solution. Extremely low dropout voltage of only 10 mV allows operation from very low input voltages, which can be very useful in battery-operated systems.
Both the VREF and VBIAS voltages have the same excellent specifications and can sink and source current equally well. Very good long-term stability and low noise levels make these devices ideally-suited for high-precision industrial applications.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| 应用手册 | 关于数据转换器的基准电压选择和设计提示 (Rev. B) | PDF | HTML | 英语版 (Rev.B) | PDF | HTML | 2024-1-10 | |
| 电子书 | Tips and tricks for designing with voltage references (Rev. A) | 2021-5-7 | ||||
| 电子书 | 电压监测仪和电压检测器：提示、技巧和基础知识 | 英语版 | 2019-8-28 | |||
| 白皮书 | Voltage reference selection basics white paper (Rev. A) | 2018-10-23 |
设计与开发
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TIPD156 — 低漂移双向单电源低侧电流检测参考设计
该 TI 高精度验证设计实现了一款低漂移、双向、低侧、单电源电流检测解决方案，可测量 -2.5A 至 +2.5A 的负载电流。其输出范围为 250mV 至 2.75V，且 0A 电流对应 1.5V 的中心电压。为实现低漂移性能，该解决方案采用了 INA213B 和 REF2030。 通过制作 PCB 并测量 -40°C 至 125°C 温度范围内的结果，验证了该设计的功能和性能。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| SOT-23-THN (DDC) | 5 | Ultra Librarian |