Application of GXSC dual channel 16 bit analog-to-digital converter GX9268 replacing AD9268 in dynamic strain gauges

Dynamic strain gauges are devices used to monitor the strain changes of structural components under dynamic loads. The performance of the equipment determines the accuracy of structural strength analysis, fatigue life assessment, and vibration characteristic research. Therefore, dynamic strain measurement requires characteristics such as "high speed, high precision, and high reliability" for the acquisition chip. This article recommends using a dual channel 16 bit analog-to-digital converter GX9268. GX9268‘s high sampling rate, high resolution, low noise, and wide dynamic range performance PIN TO PIN replaces ADI‘s AD9268.

The GX9268 adopts a multi-stage differential pipeline architecture with built-in output error correction logic. It can provide 16 bit accuracy at a data rate of 125MSPS and ensure no code loss throughout the entire operating temperature range. The GX9268 has high resolution and wide dynamic range, which can balance weak and strong strain signals. GX9268 has multiple built-in functional features that enable optimal device flexibility and lowest system costs, such as generating programmable digital test codes. The available digital test codes include built-in fixed codes and pseudo-random codes, as well as user-defined test codes input through the serial port interface.

GX9268 uses a differential clock input to control all internal conversion cycles. The digital output data format is offset binary, Gray code, or binary complement. Each ADC channel has a data output clock (DCO) to ensure that the receiving logic has the correct latch timing. This device supports 1.8V CMOS output and LVDS output, and the output data can be multiplexed on a single output bus.

GX9268 Main Performance:

1.8V analog power supply

1.8V digital output power supply

Low power consumption: 495mW (125MSPS)

Signal to Noise Ratio (SNR): 76dBFS (fin)= 30.5MHz@125MSPS )

Non spurious dynamic range (SFDR): 77dBc (fin)= 30.5MHz@125MSPS )

• On chip reference voltage source and sample and hold circuit

QFN-64 package 9mm × 9mm