GX7124 Replaces AD7124 in Distributed Control Systems

Precision AFE GX7124 low temperature drift, low noise, ultra-high precision calibration-free, multi-input channels and a wealth of self-test functions are widely used in industrial automation core scenarios, distributed control system is an excellent choice, the advantages of its application are described below:

1, 0.1% of the system calibration-free accuracy: the current mainstream temperature measurement boards need 0.1% accuracy, due to many manufacturers of chips (including some international manufacturers) can not meet the initial accuracy requirements, the vast majority of manufacturers are in the production process coupled with the system calibration process, which will greatly increase the cost of production, but also reduces production efficiency. GX7124 products in the design and factory will ensure that the 0.1% calibration-free accuracy, and this accuracy has been included in the chip in the error of each module, such as the reference error, gain error, as well as misalignment error.

2, low temperature drift: industrial applications in addition to the accuracy requirements, but also need to maintain 0.3% accuracy over a wide temperature range. For this reason, GX7124 in the design of the reference in addition to ensure that the low temperature drift, but also take into account the temperature drift of the ADC and PGA (all gain), so as to ensure that the system temperature drift (including the reference) in 10ppm / ℃, to meet the RTD and thermocouples and other stringent requirements of the application.

3, excellent performance IDAC: RTD measurement often requires very high precision, and three-wire temperature measurement in industrial temperature measurement applications is the most common form, requiring two IDAC in the full temperature range highly matched, especially in the simultaneous support of three-wire and four-wire applications, IDAC mismatch will lead to the existence of a large error between the two temperature measurement methods. Many manufacturers of chips on the market can not meet the application requirements, many customers use IDAC exchange excitation, so although the problem can be solved, but will also reduce the conversion efficiency by half.GX7124 specially optimized IDAC matching, to ensure that its room temperature has a matching degree of 0.1%, and at the same time, has a very low temperature drift matching degree.

4, hardware compatibility and expandable more channels: In thermocouple applications, PT or NTC is often needed for cold end compensation. the GX7124 not only ensures compatibility with the mainstream hardware design in the market, but also extends more channels through the multiplexing function, which makes it easy to realize the measurement of cold end compensation or monitoring of other electrical signals.

5, wide range of operating voltage: some AFEs on the market only support a maximum of 3.3V power supply, while in industrial environments 5.0V is often the most commonly used voltage, the GX7124 can support a wide range of 2.7 ~ 5.5V power supply, which can simplify the customer‘s power supply design, and at the same time to provide a wider range of signal input.