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US Digital S4 Miniature Optical Shaft Encoder (Rotary)
The S4 miniature optical shaft encoder is a non-contacting rotary to digital converter. Useful for position feedback or manual interface, the encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs without index. The encoder utilizes a mylar disk, metal shaft, and bushing or bearing. It operates from a single +5VDC supply.
The S4 encoder is available with ball bearings for motion control applications, or static drag to feel like a potentiometer for front-panel manual interface.
The reflective sensor incorporates an LED light source and a monolithic photo detector with signal shaping electronics, providing two channel bounceless quadrature TTL outputs.
The S4 can be connected by using a high retention 4 conductor snap-in polarized 1.25mm pitch connector. The mating connector is polarized and should attach smoothly to the encoder; do not force. See below for Cables & Connectors.
Features:
Miniature size
Low cost
High retention snap-in polarized connector
Tracks from 0 to 30,000 cycles/sec
Ball bearing option tracks up to 7,000 or 15,000 RPM
-20 to +100C operating temperature
100 to 360 cycles per revolution (CPR)
400 to 1440 pulses per revolution (PPR)
2 channel quadrature TTL squarewave outputs
*On January 16, 2012, the S4 part number was modified. The S4 optical encoder is now offered with a differential output option; as a result, the S4 part number was changed to accommodate either the single ended or differential output options. The S4 part number also has a place holder added for a possible future index option. The index option is currently not available and there is not a projected date at which it will be made available. The current "Power" option for the S4 was also removed from the part number. The power option is very rarely selected and therefore is being eliminated from the S4 part number.