GENERAL DESCRIPTION

The ADM488A and ADM489A are low power, differential line transceivers suitable for communication on multipoint bus transmission lines. They are intended for balanced data transmission and comply with both RS-485 and RS-422 standards of the Electronics Industries Association (EIA). Both products contain a single differential line driver and a single differential line receiver, making them suitable for full-duplex data transfer. The ADM489A contains an additional receiver and driver enable control.

The input impedance is 12 kΩ, allowing 32 transceivers to be connected on the bus. The ADM488A/ADM489A operate from a single 5 V ± 10 power supply.

FEATURES

Complies with ANSI TIA/EIA-485-A-1998 and ISO 8482: 1987(E)

250 kbps data rate

Single 5 V ± 10 supply

−7 V to +12 V bus common-mode range

Connect up to 32 nodes on the bus

Reduced slew rate for low EM interference

Short-circuit protection

30 μA supply current

APPLICATIONS

Low power RS-485 and RS-422 systems

DTE-DCE interface

Packet switching

Local area networks

Data concentration

Data multiplexers

Integrated services digital network (ISDN)