The voltage reference source GX31xx, compatible with REF31xx/MAX606xA, is applied in precision measurement equipment

In the field of industrial production, precision measurement equipment is the guarantee of quality and efficiency, such as high-precision digital multimeters, sensor calibration systems, signal generators, and other devices. Among the numerous factors affecting the accuracy of precision measurement equipment, the voltage reference source is the key core for achieving precise measurements. The voltage reference source provides a stable reference voltage for precision measurement equipment, ensuring the smooth operation of the entire circuit system. This article primarily introduces a low-temperature drift, low-power, and compact series of voltage reference sources, the GX31xx, which can replace the REF31xx/MAX606xA for use in precision measurements.

The GX31xx features a maximum temperature drift of 15ppm/°C, with a CMOS voltage reference offering an initial accuracy of up to ±0.15%. It serves directly as a precision measurement reference without requiring additional calibration. Additionally, it delivers low output noise of only 15μVp-p/V, ensuring reliable measurement of weak signals. The GX31xx is housed in a compact SOT-23 package, compatible with most ADCs and DACs, and operates over a wide temperature range of −40°C to 125°C. Its low output voltage hysteresis and minimal long-term output voltage drift further enhance stability and system reliability.

The main features of the GX31xx are as follows:

Initial accuracy: ±0.15%

Maximum temperature coefficient: 15 ppm/°C, maximum, ranging from −40°C to 125°C

Operating temperature range: −40°C to 125°C

Output current: ±10mA

Low static current: 125µA

Ultra-low load voltage drop: 200mV

Input voltage: 2.7~5.5V

Output 1/f noise (0.1Hz to 10Hz): 15µVp-p/V

Long-term stability: 45ppm/1000 hours

Small package, 3-pin SOT-23 package

In PCB design, a reasonable layout can effectively reduce the occupied space. The small size and low operating current (125μA) of the GX31xx make it suitable for portable and battery-powered applications.