Data Sheet AEDR-871x 3-Channel High Resolution Reflective Incremental Encoder (Digital Outputs) Description Features The Broadcom AEDR-871x encoder is the smallest World s smallest 3-channel reflective technology encoder 3-channel optical encoder with digital outputs that employs Reflective Technology for motion control. Digital Output option 3 channels TTL compatible 2 channel quadrature (AB) digital outputs for direction The encoder is designed to operate over the 40C to 85C sensing and a third channel, Index digital output. temperature range and so is suitable for both commercial Built-in interpolator for 4, 8, and 16 interpolation. and industrial applications. Surface mount leadless package 3.95 mm (L) 3.4 mm (W) 0.9562 mm (H) AEDR-871x offers high resolution (318 LPI) with built-in Operating voltage of 3.3V or 5V supply interpolation, enabling great flexibility and versatility in Built-in LED current regulation, removing the need for resolution range. external biasing resistor 40 C to 85 C absolute operating temperature The compact dimensions of 3.95 mm (L) 3.4 mm (W) Encoding resolution: 318 (lines/inch, LPI) 0.9562 mm (H) coupled with the low operating 3.3V option allows it to be used in a wide range of miniature commercial applications and portable devices in which space and power Applications consumption is a primary concern. Ideal for high volume applications: AEDR-871x encoder offers two-channel (AB) quadrature Miniature motors digital outputs and a third channel, index digital outputs. Printers and copiers Being TTL compatible, the outputs of the AEDR-871x Card readers encoder can be interfaced directly with most of the signal Miniature camera module processing circuitries. Therefore, the encoder provides Portable measurement devices great design-in flexibility and easy integration into existing Healthcare, lab diagnostic equipment and portable systems. devices Optometric equipment Consumer and industrial product applications Broadcom AV02-4517EN November 30, 2017AEDR-871x Data Sheet 3-Channel High Resolution Reflective Incremental Encoder (Digital Outputs) Output Waveform Top View C P 360 e Deg A I B S1 S2 S3 S4 Anti-clockwise Po Encoder CH A leads Index of 90 e Deg option I CH B Po Index of 180 e Deg option I Po Codewheel Index of 360 e Deg option I Note: Drawing not to scale Codewheel rotation movement (Anti-clockwise) QUADRATURE SIGNALS A, B and I Test Parameter Definitions Parameter Symbol Description Count N The number of bar and window pairs, or counts per revolution (CPR), of the codewheel. One Cycle C 360 electrical degrees (e), 1 bar and window pair. One Shaft Rotation 360 mechanical degrees, N cycles. Cycle Error C An indication of cycle uniformity. The difference between an observed shaft angle that gives rise to one electrical cycle, and the nominal angular increment of 1/N of a revolution. Pulse Width (Duty) P The number of electrical degrees that an output is high during 1 cycle. This value is nominally 180e or 1/2 cycle. Pulse Width (Duty) Error P The deviation, in electrical degrees, of the pulse width from its ideal value of 180e. State S The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90e. State Error S The deviation, in electrical degrees, of each state width from its ideal value of 90e. Phase The number of electrical degrees between the center of the high state of channel A and the center of the high state of channel B. This value is nominally 90e for quadrature output. Phase Error The deviation of the phase from its ideal value of 90e. Optical Radius R The distance from the codewheels center of rotation to the optical center (O.C.) of the encoder OP module. Index Pulse Width P The number of electrical degrees that an index is high during one full shaft rotation. O Broadcom AV02-4517EN 2 Amplitude