General Description

The KM4111 (single) and KM4121 (single with disable) are ultra-low power, low cost, voltage feedback amplifiers. These amplifiers use only 208µA of supply current and are designed to operate on +2.7V, +5V, or ±2.5V supplies. The input voltage range extends 300mV below the negative rail and 1.2V below the positive rail.

The KM4111 offers high bipolar performance at a low CMOS price. The KM4111 offers superior dynamic performance with a 35MHz small signal bandwidth and 27V/µs slew rate. The combination of lowpower, high bandwidth, and rail-to-rail performance make the KM4111 well suited for battery-powered communication/computing systems.

Features

■ 208µA supply current

■ 35MHz bandwidth

■ Power down to Is = 35µA (KM4121)

■ Fully specified at +2.7V and +5V supplies

■ Output voltage range: 0.08V to 4.88V; Vs = +5

■ Input voltage range: -0.3V to +3.8V; Vs = +5

■ 27V/µs slew rate

■ ±8.5mA linear output current

■ ±13mA short circuit output current

■ 21nV/√Hz input voltage noise

■ Directly replaces MAX4281

■ Small package options (SOT23-5 and SOT23-6)

Applications

■ Portable/battery-powered applications

■ A/D buffer

■ Active filters

■ Signal conditioning

■ Portable test instruments