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AM26C32PW 数据表(PDF) 10 Page - Texas Instruments |
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AM26C32PW 数据表(HTML) 10 Page - Texas Instruments |
10 / 31 page DIN D AM26C31 (One Driver) D RT AM26C32 (One Receiver) ROUT AM26C32 SLLS104K – DECEMBER 1990 – REVISED JUNE 2015 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information When designing a system that uses drivers, receivers, and transceivers that comply with RS-422 or RS-485, proper cable termination is essential for highly reliable applications with reduced reflections in the transmission line. Because RS-422 allows only one driver on the bus, if termination is used, it is placed only at the end of the cable near the last receiver. In general, RS-485 requires termination at both ends of the cable. Factors to consider when determining the type of termination usually are performance requirements of the application and the ever-present factor, cost. The different types of termination techniques discussed are unterminated lines, parallel termination, AC termination, and multipoint termination. Laboratory waveforms for each termination technique (except multipoint termination) illustrate the usefulness and robustness of RS-422 (and, indirectly, RS- 485). Similar results can be obtained if 485-compliant devices and termination techniques are used. For laboratory experiments, 100 feet of 100- Ω, 24-AWG, twisted-pair cable (Bertek) was used. A single driver and receiver, TI AM26C31C and AM26C32C, respectively, were tested at room temperature with a 5-V supply voltage. Two plots per termination technique are shown. In each plot, the top waveform is the driver input and the bottom waveform is the receiver output. To show voltage waveforms related to transmission-line reflections, the first plot shows output waveforms from the driver at the start of the cable; the second plot shows input waveforms to the receiver at the far end of the cable. 9.2 Typical Application Figure 4. Differential Terminated Configuration 9.2.1 Design Requirements Resistor and capacitor (if used) termination values are shown for each laboratory experiment, but vary from system to system. For example, the termination resistor, RT, must be within 20% of the characteristic impedance, Zo , of the cable and can vary from about 80 Ω to 120 Ω. 9.2.2 Detailed Design Procedure Figure 4 shows a configuration with no termination. Although reflections are present at the receiver inputs at a data signaling rate of 200 kbps with no termination, the RS-422-compliant receiver reads only the input differential voltage and produces a clean signal at the output. 10 Submit Documentation Feedback Copyright © 1990–2015, Texas Instruments Incorporated Product Folder Links: AM26C32 |
类似零件编号 - AM26C32PW |
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类似说明 - AM26C32PW |
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