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| Agilent AEDA-3200-Txx Series Ultra Miniature, High Resolution Incremental Encoders Data Sheet Features * Two channel quadrature output with index * Quick and easy assembly using Plug and Play tool * Cost-effective * Ultra miniature size (17 mm) 17.6 Description The AEDA-3200-T series (top mounting type) are high performance, cost effective, three-channel optical incremental encoder modules. AEDA-3200-T series emphasize high reliability, high resolution and easy assembly, using transmissive encoder technology to sense rotary position. Outputs of the AEDA-3200 encoders are two channel quadrature outputs and a third channel gated index output. These encoder modules can be easily mounted to customer specific applications with the specially designed Plug and Play tool. * Resolution options from 2500 to 10000 Cycles Per Revolution (CPR), up to 40000 counts with 4X decoding * Integrated RS 422 differential line driver 11 .4 17.0 Outline Drawing 2x5 - 1.27mm pitch pin (0.4mmx0.4mm) header Detector PCB PDA Reticle 0.1 0.010 Lens Codewheel Hub Emitter PCB 2 Theory of Operation The AEDA-3200 translates rotary motion of a shaft into a three channel digital output. The AEDA-3200 series has five key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured photodiodes, an interpolator IC, a line driver IC and a pair of lenses. This light is used to produce internal signals A and A-, and B and B-. RESISTOR Vcc PHOTODIODES Ch A Ch A LE D LENS SIGNAL PROCESSING CIRCUITRY Ch B Ch B I I CODEWHEEL As part of the "push-pull" detector system, these signals are fed through comparators and line driver that are part of the signal processing circuitry to produce the final outputs for channels A. The AEDA-3200 is available for cycles per revolution (CPR) of 2500 to 10000. This translates to a maximum resolution of 40000 counts after quadrature decode (4X). Output Waveforms AMPLITUDE C P 2.5 V Gnd f S1 S2 S3 S4 0.5V CH. A 2.5 V 0.5 V CH. B 2.5 V 0.5 V CH. I CH. I2.5 V 0.5 V CH. A2.5 V 0.5 V CH. B2.5 V 0.5 V Po CODEWHEEL ROTATION (Clockwise) 3 Definitions Count (N): N refers to the cycles per revolution (CPR) of the encoder output. One Cycle (C): 360 electrical degrees ( e). One Shaft Rotation: 360 mechanical degrees, N cycles (rotary motion only). Phase (): The number of electrical degrees between the center of the high state on the channel A and the center of the high state of channel B. This value is nominally 90 e. Pulse Width (P): The number of the electrical degrees that an output is a high-level during one cycle, nominally 180 e or 1/2 a cycle. Pulse Width Error (P): The deviation in electrical degrees of the pulse width from its ideal value of 180 e. Index Pulse Width (Po): The number of electrical degrees that an index is high during one full shaft rotation. This value is nominally 90 e or 1/4 cycle. State Width (S): The number of the electrical degrees between a transition in the output of the channel B. There are 4 states per cycle, each nominally 90 e. State Width Error (S): The deviation in electrical degrees of each state width from its ideal value of 90 e. 4 Direction of Motor Rotation When the codewheel rotates in a clockwise direction, channel A will lead channel B (Figure 1 illustrates the definition of clockwise direction of codewheel rotation). When the codewheel rotates in a counter-clockwise direction, channel B will lead channel A. Direction of codewheel rotation Figure 1. Viewed from the PCB encoder end. Absolute Maximum Ratings Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current per Channel Frequency -40C to 125C -40C to 125C 4.5 V to 5.5 V -0.5 V to Vcc 20 mA 1 MHz Recommended Operating Conditions Parameter Temperature Supply Voltage Frequency Symbol TA VCC f Min. -40 4.5 Typical 25 5.0 125 Max. 125 5.5 1000 Units C Volts kHz Notes Ripple <100 mVp-p f = RPM x CPR 60 Maximum Frequency and RPM CPR 2500 5000 6000 7200 7500 8000 10000 Maximum Frequency (kHz) 1000 1 1000 1000 1000 1000 1000 1000 Maximum RPM 12000 12000 10000 8300 8000 7500 6000 Note: 1. Maximum frequency will be lower due to limitation in maximum RPM. 5 Electrical Characteristics Electrical characteristics over recommended operating conditions. Typical values at 25oC. Parameter Supply Current High level Output Voltage Low level Output Voltage Symbol ICC VOH VOL Min. Typical 55 Max. 80 Units mA V 2.5 3.4 0.3 0.5 V Encoding Characteristics Encoding characteristics over recommended operating conditions. Typical values at 25oC. Parameter Pulse Width Error State Width Error Phase Error Symbol P S Typical 5 5 1 Max. 85 60 40 Units e e e Mechanical Characteristics (Refer to page 2 for details.) Parameter Standard Shaft Diameters Mounting Screw Size: Dimension/Details 2 mm diameter maximum * M2.5 x 0.45 (Recommended Length 6 mm) Tolerance +0/-.01 (+0/-.0005) Units mm (in) mm * Note: 1. Using a step shaft, maximum shaft diameter is 4 mm. 2. 000 Note: Tighter tolerance control will be better Baseplate 2.00 t o 4.00 Cod ewheel 7.00 Ma ximu m Hub 6 Pin Assignments Pin Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 Signal B+ BGnd Gnd A+ AVcc Vcc I+ I- Description Digital Output Digital Output Ground Pin Ground Pin Digital Output Digital Output Input Voltage Input Voltage Digital Output Digital Output 10 8 6 4 2 9 753 1 Notes: 1. Both Pin 7 and Pin 8 must be connected to Vcc. 2. Either Pin 3 or Pin 4 must be connected to Gnd. Mating Connector AEDA-3200 requires a 5 x 2 (1.27 mm x 1.27 mm) female IDC Connector. The cable used is 0.635 mm pitch flat ribbon cable. Electrical Interface Agilent recommends National Semiconductor DS26C32AM Quad Differential Line Receiver or compatible as line receiver. Unused pin should be grounded for noise reduction. Ch A+ Ch ACh B+ Ch BCh I+ Ch IAEDA-32xx Vcc 1k 1k 2 1 1A 1B 6 2A 7 2B 10 3A 9 3B 14 4A 15 4B 12 G 4G DS26C32AM 1Y 2Y 3Y 3 5 11 A B I 4Y 13 1k Alignment Considerations The Plug and Play tool is intended to absorb normal installation misalignment and runouts. To achieve the optimum performance, user should minimize misalignment. Complete instruction for AEDA-3200 Plug and Play installation can be found in the AEDA-3200 application note. AEDA-3200 Plug and Play tool part number is HEDS-8940. Plug and Play tool. 7 Ordering Information AEDA-3200- T Resolution Options (CPR) AJ 2,500 B1 5,000 B7 6,000 BJ 7,200 BK 7,500 BM 8,000 C1 10,000 Counts After 4x Decoding 10,000 20,000 24,000 28,800 30,000 32,000 40,000 www.agilent.com/semiconductors For product information and a complete list of distributors, please go to our web site. For technical assistance call: Americas/Canada: +1 (800) 235-0312 or (916) 788-6763 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (65) 6756 2394 India, Australia, New Zealand: (65) 6755 1939 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (65) 6755 1989 Singapore, Malaysia, Vietnam, Thailand, Philippines, Indonesia: (65) 6755 2044 Taiwan: (65) 6755 1843 Data subject to change. Copyright (c) 2004 Agilent Technologies, Inc. December 7, 2004 5989-1389EN |
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