Product Overview
The Broadcom AEDR-871x is the world's smallest 3-channel optical encoder utilizing Reflective Technology for motion control. Designed for miniature commercial and portable devices, it offers high resolution (318 LPI) with built-in interpolation, operating from 40C to 85C. Its compact size (3.95 mm x 3.4 mm x 0.9562 mm) and low 3.3V operating voltage make it ideal for space and power-constrained applications. The encoder provides two-channel (AB) quadrature digital outputs and a third index digital output, all TTL compatible for easy integration with signal processing circuitry.
Product Attributes
- Brand: Broadcom
- Technology: Reflective Technology
- Output Type: Digital
Technical Specifications
| Parameter | Symbol | Description | Value | Units | Notes |
|---|---|---|---|---|---|
| Operating Conditions | TA | Operating Temperature | 40 to 85 | C | |
| VCC | Supply Voltage | 3.0 to 3.6 (3.3V) or 4.5 to 5.5 (5V) | V | Ripple < 100 mVp-p | |
| ICC | Current Consumption | 27 (Typ.), 60 (Max.) | mA | ||
| Encoding Characteristics | LPI | Line Density | 318 | lines/inch | |
| CPR (@1x Interpolation) | Counts Per Revolution | Dependent on ROP | CPR = LPI 2 ROP (inch) | ||
| Interpolation Factors | 4, 8, 16 | Selectable via SEL1/SEL2 pins | |||
| Max. Output Frequency (4 Interpolation) | F | 240 | kHz | ||
| Max. Output Frequency (16 Interpolation) | F | 960 | kHz | ||
| Output Waveform Parameters | P | Pulse Width (Duty) | Nominally 180e | e | |
| S | State | Nominally 90e | e | 4 states per cycle | |
| Phase | Nominally 90e | e | For quadrature output | ||
| Physical Dimensions | Length | 3.95 | mm | ||
| Width | 3.4 | mm | |||
| Height | 0.9562 | mm | |||
| Package | Type | Surface mount leadless | |||
| Pin Count | 9 | ||||
| Codewheel Characteristics | LW | Window/Bar Length | 1.80 (0.071) | mm (inches) | |
| Codewheel Characteristics | Rf | Specular Reflectance | 60 | % | Reflective area |
| Codewheel Characteristics | LPmm | Line Density | 12.52 | lines/mm | LPmm = LPI/25.4 |
| Dynamic Performance (Typical, 4 Interpolation) | C | Cycle Error | 17 | e | |
| Dynamic Performance (Typical, 8 Interpolation) | C | Cycle Error | 28 | e | |
| Dynamic Performance (Typical, 16 Interpolation) | C | Cycle Error | 35 | e | |
| Dynamic Performance (Typical, 4 Interpolation) | P | Pulse Width (Duty) Error | 14 | e | |
| Dynamic Performance (Typical, 8 Interpolation) | P | Pulse Width (Duty) Error | 18 | e | |
| Dynamic Performance (Typical, 16 Interpolation) | P | Pulse Width (Duty) Error | 22 | e | |
| Dynamic Performance (Typical, 4 Interpolation) | Phase Error | 5 | e | ||
| Dynamic Performance (Typical, 8 Interpolation) | Phase Error | 8 | e | ||
| Dynamic Performance (Typical, 16 Interpolation) | Phase Error | 9 | e | ||
| Dynamic Performance (Typical, 4 Interpolation) | S | State Error | 8 | e | |
| Dynamic Performance (Typical, 8 Interpolation) | S | State Error | 10 | e | |
| Dynamic Performance (Typical, 16 Interpolation) | S | State Error | 13 | e | |
| Index Pulse Width (Gated 90) | Po | 90 | e | ||
| Index Pulse Width (Gated 180) | Po | 180 | e | ||
| Index Pulse Width (Gated 360) | Po | 360 | e | ||
| Electrical Characteristics | VOH | High Level Output Voltage | 2.4 | V | IOH = 4 mA |
| Electrical Characteristics | VOL | Low Level Output Voltage | 0.4 | V | IOH = +4 mA |
| Electrical Characteristics | tr | Rise Time | < 100 | ns | CL 50 pF |
| Electrical Characteristics | tf | Fall Time | < 100 | ns | CL 50 pF |
Applications: Miniature motors, Printers and copiers, Card readers, Miniature camera modules, Portable measurement devices, Healthcare equipment, Lab diagnostic equipment, Optometric equipment, Consumer and industrial products.
2510101208_Broadcom-AEDR-8712-102_C37661826.pdf
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