8.3.1 SAR ADC Driver

The OPA2626 is designed to drive precision (16-bit and 18-bit) SAR ADCs at sample rates up to 1 MSPS. The combination of low output impedance, low THD, low noise, and fast settling time make the OPA2626 the ideal choice for driving both the SAR ADC inputs, as well as the reference input to the ADC. Internal slew boost circuitry increases the slew rate as a function of the input signal magnitude, resulting in settling from a 4-V step input to 16-bit levels within 280 ns. Low output impedance (1 Ω at 1 MHz) ensures capacitive load stability with minimal overshoot.