Quad CMOS op-amp with 10 MHz GBW and rail-to-rail output
The MAX4234AUD+: The rail-to-rail output stage allows the signal to swing within millivolts of each supply rail, preserving dynamic range in low-voltage single-supply designs. Each output can source or sink up to 200 mA, making it suitable for driving moderate loads directly.
Temperature grade and input precision
Input bias current is 1 pA typical at 25°C — this doubles roughly every 10°C, so at 85°C it remains below 100 pA, still negligible for a 10-kΩ sensor but significant for a 10-MΩ piezoelectric front-end. Input offset voltage is 850 µV maximum, a figure that sets the DC accuracy floor for the signal chain.