Texas Instruments' OPA2625 operational amplifier is an excellent 16-bit and 18-bit SAR ADC driver that is high precision with low THD and noise allowing for a unique power-scalable solution. This device is fully characterized and specified with a 16-bit settling time of 280 ns that enables a true 16-bit effective number of bits (ENOB). Along with a high dc precision of only 100 µV offset voltage, a wide gain-bandwidth product of 120 MHz and a low wideband noise of 2.5 nV/√Hz, this device is optimized for driving high-throughput, high-resolution SAR ADCs, such as the ADS88xx family of SAR ADCs.
The OPA2625 features two operating modes: high-drive and low-power. In the innovative low-power mode, the OPA2625 tracks the input signal allowing the OPA2625 to transition from low-power mode to high-drive mode at 16-bit ENOB within 170 ns.
The OPA2625 device is available in 6-pin SOT and 10-pin VSSOP packages and is specified for operation from -40°C to 125°C.