GXSC Voltage Reference Replaces ADR4520/4525/4540 in Multi-Channel Data Acquisition Modules

Multi-channel data acquisition modules are typically based on analog-to-digital converters (ADCs), capable of simultaneously acquiring analog signals from multiple channels and converting them into digital signals. They are widely used in industrial automation, sensor data acquisition, and embedded systems. As the “quantization scale” for the ADCs within the module, the voltage reference’s accuracy, noise, and temperature drift characteristics directly determine the measurement limits of the entire acquisition system. The GXSC voltage reference can replace the ADR4520/4525/4540 to meet the application requirements of multi-channel acquisition modules.

Multi-channel acquisition modules must achieve multi-parameter, synchronized, and high-precision data acquisition. These modules typically require the simultaneous connection of 8 or 16 channels, demanding a high degree of consistency in the data collected from each channel. This necessitates a voltage reference with extremely high initial accuracy and minimal long-term drift to ensure a unified quantization reference for all channel ADCs. The GXSC voltage reference achieves an absolute voltage accuracy of ±0.1%. Within the operating temperature range of -55°C to 125°C, the device typically exhibits a temperature drift of 5 ppm/°C, with the ultra-low-drift version offering a drift as low as 3 ppm/°C. At an output voltage of 2.5 V, the 1/f noise voltage is 9 μVpp, and the device delivers a power supply rejection ratio (PSRR) of up to 60 dB in the 0 Hz to 1 kHz range.

The GXSC voltage reference offers three output voltage options: 2.048V, 2.5V, and 4.096V, and can replace the corresponding reference models ADR4520, ADR4525, and ADR4540. Specifically, the GXSC voltage references corresponding to the ADR4520 and ADR4525 operate within a supply voltage range of 3.1V to 5.5V, while the GXSC voltage reference corresponding to the ADR4540 operates within a supply voltage range of 4.75V to 5.5V. The typical quiescent current is 900μA, and the maximum load current is ±10mA.

This series is housed in an 8-pin SOIC package and is hardware-compatible with the imported ADR4520/25/40 products, with an operating temperature range of -55°C to 125°C. Its performance specifications are as follows:

 Input voltage range: 2.3–6.5V

 Ultra-low temperature drift, as low as 3 ppm/°C

 Absolute initial voltage accuracy of ±0.1%

60 dB power supply ripple rejection from 0 Hz to 1 kHz

1/f noise as low as 9 μVpp from 0.1 Hz to 10 Hz

Low quiescent current of 900 μA

Drive current of ±10 mA

Compact SOIC-8 package

Multiple voltage options: 2.048 V, 2.500 V, 4.096 V

 ESD protection rating: 6 kV (HBM)

Operating temperature range: -55°C to 125°C