GX2245 in infrared detector applications, compatible with LTC2245

With the development of modern technology, infrared detectors are used in a wider and wider range of fields, including military, aviation, medical and other fields. Infrared detector as a device that can detect the thermal radiation of human body and objects, one of its core components is the readout circuit. The role of the readout circuit is to convert the signals detected by the infrared detector into digital signals for processing, thus realizing the extraction and storage of data. 14-bit pipelined analog-to-digital converter, as an important part of the readout circuit of the infrared detector, whose performance has a direct impact on the performance of the entire readout circuit.

 

However, due to the differences in application fields and the application of new materials, infrared detector readout circuits are still facing some problems, including low signal-to-noise ratio, small dynamic range, and high energy consumption. Therefore, this paper introduces the GXSC analog-to-digital converter GX2245 for infrared detectors, which is designed to digitize high-frequency wide dynamic range signals and is ideally suited for demanding imaging and communication applications to improve the overall performance of infrared detector readout circuits.

 

The GX2245 utilizes a multi-stage differential pipeline architecture with built-in high performance sample-and-hold circuitry and an on-chip reference voltage source. With a 72.8dB signal-to-noise ratio and 85dB spurious-free dynamic range at 80Msps sampling, the GX2245 can be used for input signals well above the Nyquist frequency. DC specifications include ±1LSB INL (typical), ±0.25LSB DNL (typical) and no leakage codes. Reference noise at the inputs is very low at 0.96LSB RMS.

 

The GX2245 is available in a small QFN-32 5mm x 5mm package and features low power consumption of only 60mW at 10Msps, which is extremely advantageous for compact layouts of infrared detectors, reducing design complexity and lowering the power consumption of the entire system signal chain.