The HMXADC9225 is a radiation hardened monolithic, single supply, 12-bit, 20 MSPS, analog-to-digital converter with an on-chip, high performance sample-andhold amplifier. The HMXADC9225 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy at 20 MSPS data rates, and guarantees no missing codes over the full operating temperature range.