OPA625/OPA2625 High-Bandwidth Op Amps Texas Instruments OPA625/OPA2625 High-Bandwidth Operational Amplifiers are excellent 16-bit and 18-bit, SAR ADC drivers. These amplifiers come with low THD and low noise which allows for a unique power-scalable solution. Each device is fully characterized and specified with a 16-bit settling time of 280ns. This enables a true 16-bit effective number of bits.