Quadrature clock converters

30 May 2012 Analogue, Mixed Signal, LSI

LSI/CSI recently added five new devices to its family of quadrature clock converter ICs. Designated LS7082N1, LS7083N, LS7084N, LS7183N and LS7184N, these devices are designed to interface between incremental encoders and counting devices by converting the encoder quadrature outputs into directional up/down clocks or clock and direction signals for driving the counting devices.

When interfaced with microcontrollers, these devices can free up the resources of a microcontroller by relieving its computational burden used for decoding the quadrature signals. This is especially true at high speeds where the microcontroller becomes an unwieldy tool in performing the task effectively.

Besides their primary application in motion control systems, these devices can be used in a variety of systems requiring control with directional clocks. One such application is replacing a mechanical potentiometer with a precision control comprised of a rotary encoder, quadrature clock converter and digital potentiometer (think audio volume control, etc).

Features include x1, x2 or x4 frequency multiplication of the quadrature clock; programmable output clock pulse width; on-chip filtering of quadrature inputs for added reliability; up to 16 MHz output clock frequency; 3 V to 12 V operation; and TTL and CMOS compatibility.

The LS7082N1 is available in 14-pin DIP and SOIC packages, while the other devices are available in 8-pin DIP and SOIC packages.

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