ADM3486E:  3.3 V, ±15 kV ESD-Protected, Half-Duplex Transceiver

The ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E are 3.3 V low power data transceivers with ±15 kV ESD protection suitable for full and half-duplex communication on multipoint bus transmission lines. ...More

ADM3486E:  3.3 V, ±15 kV ESD-Protected, Half-Duplex Transceiver

Product Description

The ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E are 3.3 V low power data transceivers with ±15 kV ESD protection suitable for full and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with TIA/EIA standards RS-485 and RS-422. The ADM3483E/ADM3486E are half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and receiver. The full-duplex ADM3488E/ADM3490E/ADM3491E transceivers have dedicated differential line driver outputs and receiver inputs. The ADM3491E also features enable inputs for the driver and receiver.

The devices have a 12 kΩ receiver input impedance which allows up to 32 transceivers on a bus. Since only one driver should be enabled at any time, the output of a disabled or powered down driver is three-stated to avoid overloading the bus. The driver outputs of the ADM3483E/ADM3486E/ ADM3488E are slew rate limited, in order to reduce EMI and data errors caused by reflections from improperly terminated buses. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating.

Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the commercial and industrial temperature ranges and are available in narrow 8-lead and 14-lead (ADM3491E) SOIC packages.

Features

  • TIA/EIA RS-485/RS-422 compliant
  • ±15 kV ESD-protection on RS-485 input/output pins
  • Data rates - ADM3486E: 2.5 Mbps
  • Half-duplex option
  • 2 nA supply current in shutdown mode (ADM3483E/ADM3486E/ADM3491E)
  • 32 nodes on the bus
  • Outputs high-Z when disabled or powered off
  • −7 V to +12 V common-mode input range
  • Thermal shutdown and short-circuit protection
  • Industry-standard 75176 pinout
  • 8-lead and 14-lead SOIC packages

Diagrams

ADM3486E Diagram
Functional Block Diagram for ADM3486E

Specifications

Protocols RS-422,RS-485
Pwr Supply (Vnom) +3.3
#Tx 1
# Rx 1
Data Rate 2.5Mbps
Low Power Shutdown Yes
Operating Temp Range -40 to +85

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