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CS8412 Datasheet(PDF) 35 Page - Cirrus Logic |
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CS8412 Datasheet(HTML) 35 Page - Cirrus Logic |
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35 / 38 page  CS8411 CS8412 DS61F1 35 APPENDIX A: RS422 RECEIVER INFORMATION The RS422 receivers on the CS8411 and CS8412 are designed to receive both the professional and consumer interfaces, and meet all specifications listed in the digital audio standards. Figure 20 illus- trates the internal schematic of the receiver portion of both chips. The receiver has a differential input. A Schmitt trigger is incorporated to add hysteresis which prevents noisy signals from corrupting the phase detector. Professional Interface The digital audio specifications for professional use call for a balanced receiver, using XLR connec- tors, with 110 Ω ± 20% impedance. (The XLR con- nector on the receiver should have female pins with a male shell.) Since the receiver has a very high im- pedance, a 110 Ω resistor should be placed across the receiver terminals to match the line impedance, as shown in Figure 21, and, since the part has inter- nal biasing, no external biasing network is needed. If some isolation is desired without the use of trans- formers, a 0.01 µF capacitor should be placed on the input of each pin (RXP and RXN) as shown in Figure 22. However, if transformers are not used, high frequency energy could be coupled between transmitter and receiver causing degradation in an- alog performance. Although transformers are not required by AES they are strongly recommended. The EBU requires transformers. Figures 21 and 22 show an optional DC blocking capacitor on the transmission line. A 0.1 to 0.47 µF ceramic capacitor may be used to block any DC voltage that is accidentally connect- ed to the digital audio receiver. The use of this ca- pacitor is an issue of robustness as the digital audio transmission line does not have a DC voltage com- ponent. Grounding the shield of the cable is a tricky issue. In the configuration of systems, it is important to avoid ground loops and DC current flowing down the shield of the cable that could result when boxes with different ground potentials are connected. Generally, it is good practice to ground the shield to the chassis of the transmitting unit, and connect the shield through a capacitor to chassis ground at the receiver. However, in some cases it is advanta- gous to have the ground of two boxes held to the same potential, and the cable shield might be de- pended upon to make that electrical connection. Generally, it may be a good idea to provide the op- tion of grounding or capacitively coupling to ground with a "ground-lift" circuit. + 8 k Ω 4 k Ω 4 k Ω 8 k Ω 16 k Ω 16 k Ω RXP 9 RXN 10 - Figure 20. RS422 Receiver Internal Circuit 1 XLR Twisted Pair 110 Ω 110 Ω CS8411/12 RXP RXN * See Text Figure 21. Professional Input Circuit 1 XLR Twisted Pair 110 Ω 110 Ω CS8411/12 RXP RXN 0.01 µF 0.01 µF * See Text Figure 22. Transformerless Professional Circuit |
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