ADM483EARZ

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1. DESCRIPTION

The ADM483EARZ is a 5 V, low power data transceiver with ±15 kV ESD protection suitable for half-duplex communication on multipoint bus transmission lines. The ADM483E is designed for balanced data transmission and complies with TIA/EIA Standards RS-485 and RS-422, which allow up to 32 transceivers on a bus. The ADM483E has a low current shutdown mode in which it consumes only 0.1 μA. Because only one driver is enabled at any time, the output of a disabled or power-down driver is three-stated to avoid overloading the bus. Drivers are short-circuit current-limited and are protected against excessive power dissipation by thermal shutdown circuitry that places their outputs into a high impedance state. The receiver input has a fail-safe feature that guarantees a logic high output if the input is open circuit. The ADM483E is fully specified over the industrial temperature ranges and is available in 8-lead SOIC_N packages.

2. FEATURES

    1. ±15 kV ESD protection

    2. 250 kbps data rate

    3. Reduced slew rate for low EM interference 

    4. Single 5 V ± 10% supply

    5. −7 V to +12 V bus common-mode range

    6. Up to 32 nodes on the bus

    7. Receiver open-circuit, fail-safe design

    8. Short-circuit protection

    9. 36 μA supply current

  10. 0.1 μA shutdown current

3. APPLICATIONS

    1. Low power RS-485 systems

    2. Electrically harsh environments

    3. EMI sensitive applications

    4. DTE-DCE interface

    5. Packet switching

    6. Local area networks

4. PIN CONFIGURATION

5. FUNCTION DESCRIPTIONS

6. Application information

Differential data transmission is used to transmit data reliably High speed in long distances and noisy environments. Differential transmission eliminates the influence of ground offset And noise signals appear as common-mode voltages in String. There are two main electronic standards approved The Industry Association (EIA) that specifies the electrical characteristics of transceivers used for differential data transmission. The RS-422 standard specifies data rates up to 10 MBaud and The length of the line can reach 4000 feet. One driver can drive one transmission Up to 10 receivers can be connected. In order to adapt to real multipoint communication, RS-485 The standard is defined. The standard meets or exceeds all RS-422 requirements also allow up to 32 drives and 32 receivers are connected to a single bus. An extension The common mode range is defined as −7 V to +12 V. most The significant difference between RS-422 and RS-485 is The driver can be disabled, allowing multiple (32, in fact) is connected to a single wire. Only one driver Should be enabled once, but the RS-485 standard includes Additional specifications to ensure equipment safety Line contention. The preferred transmission line for RS-485 communication is Twisted pair. Twisted pair cables tend to cancel out common mode Noise and eliminate the magnetic field generated by The current flows through each wire, thereby reducing The effective inductance of the right. RS-485 transmission line can There are up to 32 transceivers on the bus. Only one driver can Transmit at a specific time, but can have multiple receivers At the same time enable.