Description
The HEDS-5700 series is a family of low cost, high performance, optical incremental encoders with mounted shafts and bushings. The HEDS-5700 is available with tactile feedback for hand operated panel mount applications, or with free spinning shaft for applications requiring a pre-assembled encoder for position sensing.
The encoder contains a collimated LED light source and special detector circuit which allows for high resolution, excellent encoding performance, long rotational life, and increased reliability. The unit outputs two digital waveforms which are 90 degrees out of phase to provide position and direction information. The HEDS-5740 Series provides a third Index Channel.
The HEDS-5700 is quickly and easily mounted to a front panel using the threaded bushing, or it
can be directly coupled to a motor shaft (or gear train) for position sensing applications.

Features
*Two Channel Quadrature Output with Optional Index Pulse
*Available with or without Static Drag for Manual or Mechanized Operation
*High Resolution – Up to 512 CPR
*Long Rotational Life, >1 Million Revolutions
*-20 to 85°C Operating Temperature Range
*TTL Quadrature Output
*Single 5 V Supply
*Available with Color Coded Leads

Applications
The HEDS-5700 with the static drag option is best suited for applications requiring digital information from a manually operated knob. Typical front panel applications include instruments, CAD/CAM systems, and audio/video control boards.
The HEDS-5700 without static drag (free spinning) is best suited for low speed, mechanized
operations. Typical applications are copiers, X-Y tables, and assembly line equipment.

HEDS-5700-K00, HEDS-5740-K00, HEDS-5701-K00, HEDS-5741-K00

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The SN54/74LS147 and the SN54/74LS148 are Priority Encoders. They provide priority decoding of the inputs to ensure that only the highest order data line is encoded. Both devices have data inputs and outputs which are active at the low logic level. The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition does not require an input condition because zero is encoded when all nine data lines are at a high logic level. The LS148 encodes eight data lines to three-line (4-2-1) binary (octal). By providing cascading circuitry (Enable Input EI and Enable Output EO) octal expansion is allowed without needing external circuitry.
The SN54/ 74LS748 is a proprietary Motorola part incorporating a built-in deglitcher network which minimizes glitches on the GS output. The glitch occurs on the negative going transition of the EI input when data inputs 0–7 are at logical ones. The only dc parameter differences between the LS148 and the LS748 are that (1) Pin 10 (input 0) has a fan-in of 2 on the LS748 versus a fan-in of 1 on the LS148; (2) Pins 1, 2, 3, 4, 11, 12 and 13 (inputs 1, 2, 3, 4, 5, 6, 7) have a fan-in of 3 on the LS748 versus a fan-in of 2 on the LS148. The only ac difference is that tPHL from EI to EO is changed from 40 to 45 ns.

SN74LS147 SN54LS148 SN74LS148 SN54LS748 SN74LS748
TAG ENCODERS

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