GX1258 is compatible with ADS1258 and is used in fast-scanning multi-channel measurement instruments.

Multi-channel measurement technology refers to the ability to simultaneously measure the waveforms and parameters of multiple signal channels. Traditional instruments typically can only measure a single signal channel. If multiple signal channels need to be observed simultaneously, multiple instruments must be used for measurement, which not only increases instrument costs but also adds operational complexity.

Multi-channel measurement technology achieves the functionality of simultaneously measuring multiple signal channels by adding multiple channel input interfaces to the instrument. It also enhances the measurement efficiency and accuracy of the instrument.

Multi-channel measurement technology is typically implemented using multi-channel analog-to-digital converters (ADCs) for simultaneous signal acquisition. The Guoxin Sichen GX1258 is a 16-channel (multiplexed), low-noise, 24-bit ADC capable of stably acquiring data at a channel scanning rate of 1.8k to 23.7k in channel polling mode. It fully meets the performance requirements of various measurement instruments, and the GX1258 is also pin-to-pin compatible with the ADS1258, offering a certain price advantage.

The GX1258 supports a QFN-48 package (7mm × 7mm) and operates on a single +5V power supply. The digital voltage range is allowed between 2.7V and 5.25V. Its main performance features are as follows:

• Fixed channel or channel polling; fixed channel data rate: 125 kSPS  

• Channel polling rate: 23.7 kSPS per channel  

• 16 single-ended or 8 differential inputs  

• Single-ended (+5V) operation  

• Low noise: 2.8 μVRMS at 1.8 kSPS  

• 0.0003% integration nonlinearity

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

• Sensor open-circuit detection

• Conversion control pin

• Multi-output for external signal processing

• On-chip temperature, reference, offset, gain, and power supply voltage readback

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

• 8 general-purpose input/output (GPIO) pins

• 32.768 kHz crystal oscillator or external clock