The KM4212 is an ultra-low power, low cost, voltage feedback amplifier. Its typical operating voltage is +2.7V or +5V, the input voltage range is -0.3V to +3.8V, the output voltage range is 0.04V to 4.96V. The features of this amplifier include: 70µA supply current, 7.3MHz bandwidth, ±4mA linear output current, ±9mA short circuit output current, 29nV/√Hz input voltage noise. This amplifier is suitable for portable/battery-powered applications, A/D buffer, active filters, signal conditioning, portable test instruments, etc.