This application note describes how to use the MAX4382 triple amplifier to construct a low-cost, triple-channel, three-pole, lowpass Sallen-Key filter with a dual supply voltage. The circuit provides a Butterworth response with a 30MHz bandwidth, and is ideal for video-reconstruction filtering in HDTV applications. The MAX4382 is also shown as part of a single-supply, input-bias network with the same filter performance as the dual-supply configuration.