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ADN4691E Arkusz danych(PDF) 3 Page - Analog Devices |
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ADN4691E Arkusz danych(HTML) 3 Page - Analog Devices |
3 / 12 page Application Note AN-1177 Rev. 0 | Page 3 of 12 BUS TYPES AND TOPOLOGIES Standard TIA/EIA-644 LVDS devices allow low power, high speed communication. The advantages of LVDS can also be applied to multipoint applications by using TIA/EIA-899 devices. Bus topology is one of the main factors relating to which LVDS or M-LVDS devices are used in an application. POINT-TO-POINT Point-to-point bus topologies consist of a single driver and single receiver connected together using one pair of wires or traces. Figure 2 demonstrates a typical configuration, where the receiving end of the link has a termination resistor. This is the most common application for LVDS devices. Multiple pairs of wires or traces can be used to create additional channels of communication and increase total bandwidth between two points. DOUT– DOUT+ RIN– RIN+ DIN ROUT RT LVDS DRIVER LVDS RECEIVER Figure 2. LVDS Point-to-Point Link Analog Devices, Inc., has a portfolio of LVDS drivers and receivers for one, two or four LVDS channels as shown in Table 1. Unused outputs should be left open circuit. Table 1. LVDS Drivers and Receivers Part No. Tx Rx Part No. Tx Rx ADN4661 1 0 ADN4665 4 0 ADN4662 0 1 ADN4666 0 4 ADN4663 2 0 ADN4667 4 0 ADN4664 0 2 ADN4668 0 4 M-LVDS can also be used in a point-to-point topology, where the same transceiver device is used for the driver circuit (with receiver disabled) and the receiving circuit (with driver disabled). MULTI-DROP A single driver can be connected to multiple receivers using a multi-drop bus topology as shown in Figure 3. LVDS is designed for point-to-point applications and so in a multi-drop configuration, the number of receivers that can be connected and the signaling distance can be limited. M-LVDS can be used in a multi-drop topology to drive up to 32 nodes across longer distances compared to LVDS. DOUT– DOUT+ RIN– RIN+ DIN ROUT ROUT RT LVDS DRIVER LVDS RECEIVERS Figure 3. LVDS Multi-Drop Bus MULTIPOINT In networks where multiple devices can either send or receive, a multipoint bus topology may be used. M-LVDS is designed for such multi-point applications, allowing up to 32 nodes to be connected to a single bus. There are two types of multipoint buses, half-duplex and full duplex, shown in Figure 4 and Figure 5, respectively. In a half-duplex bus, two wires are used such that one device may transmit, and the other devices can receive. In a full-duplex bus, four wires are used, allowing one node to concurrently transmit back to another transmitting node (that is, slave devices responding as broadcast commands are sent by the master to all nodes). B A B A DI RO DI RO RO DI RT RT MLVDS TRANSCEIVERS Figure 4. M-LVDS Half-Duplex Bus Z Y Z Y B A B A DI RO DI RO RT RT RT RT MLVDS TRANSCEIVERS RO DI RO DI Figure 5. M-LVDS Full-Duplex Bus Another factor to be considered in multipoint buses is the bus idle condition. When no device is transmitting, the differential voltage on a terminated bus will be close to 0 V. This means that for a standard receiver with symmetrical input thresholds, the receiver output will be undefined. This corresponds to the Type 1 M-LVDS receivers with an input threshold of ±50 mV. In order to provide a guaranteed receiver output state (output low) in the bus idle condition, Type 2 M-LVDS receivers have an offset receiver input threshold of +50 mV to +150 mV. Table 2. M-LVDS Transceivers Part No. Rx Type Duplex Data Rate ADN4690E 1 Half 100 ADN4691E 1 Half 200 ADN4692E 1 Full 100 ADN4693E 1 Full 200 ADN4694E 2 Half 100 ADN4695E 2 Full 100 ADN4696E 2 Half 200 ADN4697E 2 Full 200 |
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