Application Solution for Security Infrared Imaging Systems Based on the Single-Channel 14-Bit GX2245 as an Alternative to the LTC2245

Security issues are of great concern today, and efficient, reliable security imaging systems are crucial for ensuring public safety and protecting personal property. The high-performance analog-to-digital converter GX2245 offers an excellent alternative to the LTC2245 for security imaging systems.

The GX2245 features 14-bit resolution and a maximum sampling rate of 80 MSPS, enabling high-precision conversion of analog signals to digital signals. Its low-noise and low-power consumption characteristics give it a significant advantage in the security imaging field. Additionally, the GX2245 offers excellent linearity and dynamic range, capable of capturing subtle image changes to provide clear and accurate image information for security monitoring.

The GX2245 is a multi-stage differential pipeline architecture ADC with an integrated high-performance sample-and-hold circuit and on-chip reference voltage source. It is powered by a 3V analog power supply, and a single output power supply can drive logic circuits from 2.1V to 3.6V.

This ADC is specifically designed for digitizing high-frequency wide dynamic range signals and is ideal for demanding imaging and communication applications. At an 80MHz sampling rate, it achieves a signal-to-noise ratio of 72.8dB and a spur-free dynamic range of 85dB, making it suitable for input signals far exceeding the Nyquist frequency. DC specifications include ±1 LSB INL (typical), ±0.25 LSB DNL (typical), and no missing codes. The input reference noise is extremely low at 0.96 LSB RMS.

Key features of the GX2245:

• 3V power supply

• Flexible input range: 1 Vp-p to 2 Vp-p

• Output power supply: 2.1V to 3.3V

• Low power consumption: 60mW (10MSPS)  

             218mW (80MSPS)

• 80MHz sampling, 30.5MHz input:  

   Signal-to-noise ratio (SNR): 72.83dBFS  

   Spurious-free dynamic range (SFDR): 85.62dBFS

• Differential nonlinearity (DNL): ±0.25 LSB (typical)

• Input reference noise: 0.96 LSB RMS

• On-chip reference voltage source and sample-and-hold circuit

• Available in a 32-pin QFN package.