The AD12501 is a 12-bit analog-to-digital converter (ADC) with a transformer-coupled analog input driving amplifiers providing gain, and digital post-processing for enhanced SFDR. The product operates at up to 500 MSPS conversion rate with outstanding dynamic performance in wideband carrier systems. The AD12501 requires 3.7 V analog, 3.3 V digital, and 1.5 V digital supplies, and provides a flexible encode signal that can be differential or single-ended. No external reference is required.