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ADM2687E 数据表(PDF) 3 Page - Analog Devices |
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ADM2687E 数据表(HTML) 3 Page - Analog Devices |
3 / 12 page Evaluation Board User Guide UG-317 Rev. 0 | Page 3 of 12 EVALUATION BOARD HARDWARE CONFIGURATION TEST SETUP The ADM2682E/ADM2687E evaluation board is shown in Figure 2 with the default jumper settings on LK1 through LK4 (driver and receiver enabled), power connection on J1, input signal connection on J2, and probes attached to RXD, TXD, Y, and Z for a loopback test (LK5 and LK6 are closed to connect A to Y and B to Z). JUMPER SETTINGS The inputs to the ADM2682E/ADM2687E can be configured using the jumpers on the evaluation board (see Table 1). Note that multiple jumper blocks should not be placed on LK1 to LK4 because the input sources may be shorted together. For each link, a single jumper block can be moved from one posi- tion to another, as specified in Table 1. A B C A B A B A B C D RXD RE DE TXD RXD RXD RE DE TXD A B Z Y TXD A B Z Y LK6 GND1 SHIELD GND2 VCC LK1 J3 J2 J1 J4 LK2 LK3 LK4 VISO LK5 EVAL-ADM2682E_87EEBZ OSCILLOSCOPE SIGNAL GENERATOR 3.3V OR 5V POWER SUPPLY Figure 2. Basic Operation of the Evaluation Board for the ADM2682E/ADM2687E Isolated RS-485 Transceivers Table 1. Jumper Configuration Link Connection Description LK1 A Connects the receiver output (RxD) of the ADM2682E/ADM2687E to the J3 connector. B Connects the receiver output (RxD) of the ADM2682E/ADM2687E to the J8-1 terminal block connector. LK2 A Connects the receiver enable input (RE) of the / to VCC. This setting disables the receiver. ADM2682E ADM2687E B Connects the receiver enable input (RE) of the / to GND1. This setting enables the receiver. ADM2682E ADM2687E C Connects the receiver enable input (RE) of the / to the J8-2 terminal block connector. ADM2682E ADM2687E D Connects the receiver enable input (RE) of the / to the driver enable input (DE); that is, the input for both ADM2682E ADM2687E RE and DE is set by LK3. This setting ensures that when the driver is enabled, the receiver is disabled, or when the driver is disabled, the receiver is enabled. LK3 A Connects the driver enable input (DE) of the ADM2682E/ADM2687E to VCC. This setting enables the driver. B Connects the driver enable input (DE) of the ADM2682E/ADM2687E to GND1. This setting disables the driver. C Connects the driver enable input (DE) of the ADM2682E/ADM2687E to the J8-3 terminal block connector. LK4 A Connects the driver input (TxD) of the ADM2682E/ADM2687E to the J8-4 terminal block connector. B Connects the driver input (TxD) of the ADM2682E/ADM2687E to the J2 connector. LK5 Closed Connects the ADM2682E/ADM2687E Receiver Input A to Driver Output Y. When LK5 and LK6 are both connected, the evaluation board is configured for half-duplex operation. Open When LK5 and LK6 are both open, the evaluation board is configured for full-duplex operation. LK6 Closed Connects the ADM2682E/ADM2687E Receiver Input B to Driver Output Z. When LK5 and LK6 are both connected, the evaluation board is configured for half-duplex operation. Open When LK5 and LK6 are both open, the evaluation board is configured for full-duplex operation. |
类似零件编号 - ADM2687E |
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类似说明 - ADM2687E |
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