ADM485 DATASHEET PDF

Part Number: ADM, Maunfacturer: Analog Devices, Part Family: AD, File type: PDF, Document: Datasheet – semiconductor. ADM datasheet, ADM pdf, ADM data sheet, datasheet, data sheet, pdf , Analog Devices, +5 V Low Power EIA RS Transceiver. ADM datasheet, ADM circuit, ADM data sheet: AD – +5 V Low Power EIA RS Transceiver,alldatasheet, datasheet, Datasheet search site for.

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Documents Flashcards Grammar checker. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled, the outputs are tristated.

Excessive power dissipation caused by bus contention or by output shorting is prevented datashret a thermal shutdown circuit.

This feature forces the driver output into a high impedance state if during fault conditions a significant temperature increase is detected in the internal driver circuitry. Up to 32 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at any time. It is important, therefore, that the remaining disabled drivers do not load the bus. To ensure this, the ADM driver features high output impedance when disabled and also when powered down.

The receiver contains a fail safe feature which results in a logic high output state if the inputs are unconnected floating. All inputs and outputs contain protection against ESD; all driver outputs feature high source and sink current capability.

An epitaxial layer is used to guard against latch-up. The ADM features extremely fast switching speeds. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use.

No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P. BoxNorwood, MAU. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. A low level enables the receiver output, RO.

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A high level places it in a high impedance state. A high level enables the driver differential outputs, A and B. A low level places it in a high impedance state.

ADM485 Data Sheet

Electrostatic charges as high as V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Receiver Propagation Delay Figure 7. Receiver Output Low Voltage vs.

Receiver Datasheer High Voltage vs. Driver Output Low Voltage vs.

Driver Differential Output Voltage vs. Output Current Figure Driver Output High Voltage vs.

ADM Datasheet pdf – +5 V Low Power EIA RS Transceiver – Analog Devices

Output Current —5— 5 0. Unloaded Driver Differential Outputs Figure An RS transmission line can have as many as 32 transceivers on the bus. Only one driver can transmit at a particular time but multiple receivers may be enabled simultaneously. Differential Data Transmission Differential data transmission is used to reliably transmit afm485 at high rates over long distances and through noisy environments. Differential transmission nullifies the effects of ground shifts and noise signals which appear as common-mode voltages on the line.

There are two main standards approved by the Electronics Industries Association EIA which specify the electrical characteristics of transceivers used in differential data transmission. As with any transmission line, it is important that reflections are minimized. This may be achieved by terminating the extreme ends of the dtasheet using resistors equal to the characteristic impedance of the line. Stub lengths of the main line should also be kept as short as possible.

A properly terminated transmission line appears purely resistive to the driver. A single driver can drive a transmission line with up to 10 receivers. The ADM contains thermal shutdown circuitry which protects the part from excessive power dissipation during fault conditions. Shorting the driver outputs to a low impedance source adm48 result in high driver currents.

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The dataheet sensing circuitry detects the increase in die temperature and disables the driver outputs. In order to cater for true multipoint communications, the RS standard was defined. This standard meets or exceeds all the requirements of RS but also allows for up to 32 drivers and 32 receivers to be connected to eatasheet single bus. The most significant difference between RS and RS is the fact wdm485 the drivers may be disabled thereby allowing more than one 32 in fact to be connected to a single line.

Only one driver should be enabled at time, but the RS standard contains additional specifications to guarantee device safety in the event of line contention. Propagation Delay The ADM features very low propagation delay ensuring maximum baud rate operation. Datasbeet driver is well balanced ensuring distortion free transmission. Another important specification is a measure of the skew between the complementary outputs. Excessive skew impairs the noise immunity of the system and increases the amount of electromagnetic interference EMI.

Twisted pair cable tends to cancel common-mode noise and also causes cancellation of the magnetic fields generated by the datashheet flowing through each wire, thereby, reducing the effective inductance of the pair.

ADM485 Datasheet PDF

Receiver Open-Circuit Fail Safe The receiver input includes a fail-safe feature which guarantees a logic high on the receiver when the inputs are open circuit or floating.

The ADM is designed for bidirectional data communications on multipoint transmission lines. Xfx nvidia geforce driver.