The HM2040 is an equivalent of the now obsolete SSM2040 voltage controlled filter IC. The HM2040 voltage controlled filter module can be used for all circuit configurations originally designed to use the SSM2040 integrated circuit. The module is housed in a rigid potted enclosure with 0.1" pitch legs spaced 0.7" apart. Shortened pin identifies pin 1. Features
 Low offset and good stability is achieved by using closely matched transistors throughout the design. Differential stages are implemented with monolithic (same die) transistors. These matched pairs are then encapsulated in a thermally conductive potting compound assuring that all transistors remain at the same temperature. The thermal mass of the potting reduces the effect of self heating and short term temperature fluctuations in addition to providing good mechanical resilience. A number of example circuits is given on the HM2040 datasheet. An additional example circuit is given for a 2-pole state variable filter design with voltage controlled resonance. Prices, stock level and ordering information can be found in the Shop. A more in depth look at the filter can be found in the SSMT patent. *Datasheet specifications based on +/-15V supplies. |