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AEDT-9140 Datasheet(PDF) 6 Page - AVAGO TECHNOLOGIES LIMITED |
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AEDT-9140 Datasheet(HTML) 6 Page - AVAGO TECHNOLOGIES LIMITED |
6 / 9 page 6 Electrical Interface To ensure reliable encoding performance, the AEDT-9140 three channel encoder modules require 2.7 kΩ (± 10%) pull-up resistors on output pins 2, 3, and 5 (Channels A, I and B) as shown in Figure 3. These pull-up resistors should be located as close to the encoder module as possible (within 4 feet). Each of the three encoder module outputs can drive a single TTL load in this configuration. Figure 3. Customized Solutions Customization of codewheel CPR is possible. It has to be based on the encoder LPI table given below. Part Number LPI AEDT-9140-C00 36.7 AEDT-9140-E00 73.5 AEDT-9140-F00 94 AEDT-9140-G00 132.3 AEDT-9140-H00 147 AEDT-9140-A00 183 AEDT-9140-I00 188 AEDT-9140-B0B 346 AEDT-9140-B00 367.5 CPR calculation formula: CPR = LPI x 2 x S x ROP 25.4 Where: CPR = Counts Per Revolution LPI = Encoder LPI provided in the table ROP = Encoder Optical Radius in mm * Recommended maximum codewheel diameter should not exceed 30mm. Note: The customization of the codewheel method is valid from theoreti- cal standpoint. However Avago strongly recommends a full character- ization to be done to determine the actual performance of the encoder with customized codewheel. Characterization means validating the encoding performance (consist of cycle error, pulse width error, logic state width error, phase error, po- sition error & index pulse width, index channel rise and fall time over the recommended operating conditions and recommended mounting tolerances. |
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