Single-channel 14-bit ADC GX2245 Replaces LTC2245 for Medical Photoelectric Scanning

ADCs are used in medical equipment, such as medical imaging equipment (e.g., CT, MRI, etc.), and optoelectronic diagnostic equipment, to convert optoelectronic signals to digital signals for image processing, data analysis, and diagnostic decision-making.

The GXSC GX2245 in medical photoelectric scanning converts the intensity of light signals received by photoelectric sensors into digital signals for processing and analysis by digital systems. The conversion from analog to digital signals is achieved by sampling the analog signal and quantizing each sample value into a digital value.

The GX2245 is a multi-stage differential pipeline architecture dual-channel, 14-bit ADC with built-in high-performance sample-and-hold circuitry and an on-chip reference voltage source. It is powered by a 3V analog supply, and a single output power supply can drive 0.5V to 3.6V logic circuits. Designed to digitize high-frequency, wide dynamic range signals, it is ideally suited for demanding imaging and communications applications.

With a 72.8dB signal-to-noise ratio and 85dB spurious-free dynamic range at 80MHz sampling, the GX2245 can be used for input signals well beyond Nyquist frequencies. DC specifications include ±1LSB INL (typical), ±0.25LSB DNL (typical) and no leakage codes. The reference noise at the input is very low at 0.96 LSBRMS. The GX2245 is available in a small QFN-32 5mm x 5mm package and features low power consumption of 60mW at 10Msps, which is extremely favorable for compact layouts and reduces design complexity while lowering the power consumption of the entire system signal chain.

The GX2245 performance parameters are as follows:

- Sampling frequencies of 80MSPS/65MSPS/40MSPS/25MSPS/10MSPS are available.

- Low power consumption: 60mW (10MSPS), 218mW (80MSPS);

- Differential nonlinearity (DNL): ±0.25LSB (typical) Reference noise at input: 0.96LSBRMS;

- 3V power supply, flexible input range: 1VP-P to 2VP-P;