Constant Current Sources

HJU122A是一种用厚膜集成电路工艺制成的高温、精密、单/双电源对地负载直流恒流源，也做V/I转换器。其内部集成了一个精密基准电压源、两个精密宽带运算放大器和多个精密匹配电阻对（相对匹配误差≤0.1‰）。具有输出电流可调、动态输出能力强和频率范围宽等优点，最高工作温度达到160℃。 应用灵活：可直接应用器件内部电压基准，或根据客户要求外接交、直流电压信号，可输出0.1~20mA范围的直流或交流驱动电流。可广泛用于电阻-电感对地负载型显示、扫描、伺服控制或远程数据采集等机电系统

HJU130A 高温精密单/双电源功率交直流恒流源

HJU125 单电源1.5A交直流恒流源

HJU124 单电源宽输出电流精密恒流源

Radiation Hardened 100µA Precision Current Source

Radiation Hardened 100µA Precision Current Source

Radiation Hardened 1mA Precision Current Source

Radiation Hardened 1mA Precision Current Source

Radiation Hardened 100µA and 1mA Precision Current Source

Radiation Hardened 100µA and 1mA Precision Current Source

Radiation Hardened 100µA and 1mA Precision Current Source

Radiation Hardened 100µA and 1mA Precision Current Source

Radiation Hardened 100µA Precision Current Source

Radiation Hardened 100µA Precision Current Source

Radiation Hardened 1mA Precision Current Source

Radiation Hardened 1mA Precision Current Source

Radiation Hardened 100µA and 1mA Precision Current Source

Radiation Hardened 100µA and 1mA Precision Current Source

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.

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.