LM334
- Operates From 1V to 40V
- 0.02%/V Current Regulation
- Programmable From 1µA to 10mA
- True 2-Terminal Operation
- Available as Fully Specified Temperature Sensor
- ±3% Initial Accuracy
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The LM134/LM234/LM334 are 3-terminal adjustable current sources featuring 10,000:1 range in operating current, excellent current regulation and a wide dynamic voltage range of 1V to 40V. Current is established with one external resistor and no other parts are required. Initial current accuracy is ±3%. The LM134/LM234/LM334 are true floating current sources with no separate power supply connections. In addition, reverse applied voltages of up to 20V will draw only a few dozen microamperes of current, allowing the devices to act as both a rectifier and current source in AC applications.
The sense voltage used to establish operating current in the LM134 is 64mV at 25°C and is directly proportional to absolute temperature (°K). The simplest one external resistor connection, then, generates a current with ≈+0.33%/°C temperature dependence. Zero drift operation can be obtained by adding one extra resistor and a diode.
Applications for the current sources include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. The LM234-3 and LM234-6 are specified as true temperature sensors with ensured initial accuracy of ±3°C and ±6°C, respectively. These devices are ideal in remote sense applications because series resistance in long wire runs does not affect accuracy. In addition, only 2 wires are required.
The LM134 is specified over a temperature range of −55°C to +125°C, the LM234 from −25°C to +100°C and the LM334 from 0°C to +70°C. These devices are available in TO hermetic, TO-92 and SOIC-8 plastic packages.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LM134/LM234/LM334 3-Terminal Adjustable Current Sources datasheet (Rev. E) | 2013. 6. 20 | ||
| 애플리케이션 노트 | Precision Current Sources and Sinks Using Voltage References (Rev. A) | PDF | HTML | 2026. 4. 15 | ||
| e북 | Tips and tricks for designing with voltage references (Rev. A) | 2021. 5. 7 | |||
| e북 | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 2019. 6. 28 | |||
| 애플리케이션 노트 | AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) | 2013. 5. 6 | |||
| 애플리케이션 노트 | AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) | 2013. 4. 29 | |||
| 애플리케이션 노트 | AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) | 2013. 4. 23 | |||
| 애플리케이션 노트 | TO-92 Packing Options / Ordering Instructions (Rev. A) | 2010. 6. 23 | |||
| 애플리케이션 노트 | Applying a New Precision Op Amp | 2004. 10. 4 |
설계 및 개발
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| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| WAFERSALE (YS) | — | Ultra Librarian |
| TO-92 (LP) | 3 | Ultra Librarian |