GX1258 Replaces ADS1258 in Sensor Signal Acquisition

In IoT applications, a large number of sensor nodes are distributed in different locations for collecting various environmental data and physical quantities. Analog-to-digital converters can be used as the analog-to-digital conversion module in the sensor nodes to convert the analog signals collected by the sensors into digital signals, which can be transmitted to data centers or cloud platforms through the network for further processing and analysis, realizing intelligent monitoring and management of the environment and objects.

The GX1258 is a 24-bit analog-to-digital converter capable of stably acquiring data in channel polling mode at channel scanning rates ranging from 1.8k to 23.7k. The extremely high resolution accurately converts weak analog signals captured by the sensor into digital signals.

The GX1258‘s 16 channels (multiplexed) can be connected to multiple sensors at the same time, enabling the simultaneous acquisition of multiple environmental parameters or physical quantities. For example, in a sensor network for smart agriculture, soil moisture sensors, temperature sensors, light sensors, etc. can be connected at the same time to acquire multiple data at once.

With a noise level of only 2.8μVrms at 1.8kSPS, the GX1258 effectively reduces the interference of ambient noise on the sensor signals and ensures the quality of the collected data. Supporting QFN-48 package, it operates with unipolar +5V power supply, and the range of digital voltage is allowed to be 2.7V-5.25V.

The main performance of GX1258 is as follows:

- Fixed channel or channel polling; Fixed channel data rate: 125kSPS

- Channel polling rate: 23.7kSPS/channel

- 16 single-ended or 8 differential inputs

- Unipolar (+5V) operation

- Low noise: 2.8μVRMS at 1.8kSPS

- 0.0003% integral nonlinearity

- DC stability (typical): 0.02 μV/°C offset drift, 0.4 ppm/°C gain drift

- Sensor break detection

- Conversion control pin

- Multiple outputs for external signal processing

- On-chip temperature, reference, detuning, gain and supply voltage readback

- 42mW power consumption; standby, sleep and shutdown modes

- 8 General Purpose Inputs and Outputs (GPIOs)

- 32.768kHz crystal oscillator or external clock