The ADM4850-ADM4857 are differential line transceivers suitable for high speed full and half duplex data communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with EIA Standards RS-485 and RS-422. The ADM4850-ADM4853 are half duplex transceivers which share differential lines and have separate enable inputs for the driver and receiver. The full duplex ADM4854-ADM4857 transceivers have dedicated differential line driver outputs and receiver inputs.

The devices have a 1/8-unit-load receiver input impedance which allows up to 256 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 receiver inputs have a true failsafe feature which ensures a logic high output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and when communication ceases.

The driver outputs are slew rate limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. 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 8-lead SOIC and LFCSP packages.

Part#	Min Pos Supply	Pwr Supply (Vnom)	Full-Half Duplex	ESD-Protection	Data Rate	# of Nodes On Bus	Drvr/Rcvr Enable	Fail Safe	Isolation V (rms)	Available Packages	Price* (1000-4999)	Protocols
ADM2482E	+3	+3 to +5 & ISO +3	Full, Half	15 kV	16Mbps	256	Yes	Open, Short	2.5 kV	SOIC	$4.66	RS-422, RS-485
ADM2484E	+3	+3 to +5 & ISO +3	Full, Half	15 kV	500kbps	256	Yes	Open, Short	5 kV	SOIC	$3.04	RS-422, RS-485
ADM2487E	+3	+3 to +5 & ISO +3	Full, Half	15 kV	500kbps	256	Yes	Open, Short	2.5 kV	SOIC	$3.64	RS-422, RS-485
ADM2491E	+3	+3 to +5 & ISO +5	Full, Half	8 kV	16Mbps	32	Yes	Open	5 kV	SOIC	$4.76	RS-422, RS-485
ADN4667	+3	3.3	---	15 kV	400Mbps	-	Yes	-	-	SOIC, SOP	$1.16	RS-485/LVDS
ADN4668	+3	3.3	---	15 kV	400Mbps	-	Yes	-	-	SOIC, SOP	$1.15	RS-485/LVDS
ADM2490E	+2.7	+3 to +5 & ISO +5	Full	8 kV	16Mbps	32	No	Open	5 kV	SOIC	$4.55	RS-422, RS-485
ADM2483	+2.7	+3 to +5 & ISO +5	Half	---	500kbps	256	Yes	Open, Short	2.5 kV	SOIC	$3.04	RS-485
ADM2485	+2.7	+3 to +5 & ISO +5	Half	---	16Mbps	50	Yes	Open	2.5 kV	SOIC	$5.57	RS-422, RS-485
ADM2486	+2.7	+3 to +5 & ISO +5	Half	---	20Mbps	50	Yes	Open	2.5 kV	SOIC	$5.04	RS-485
ADM3070E	+3	3.3	Full	15 kV	250kbps	256	Yes	Open, Short	---	SOIC	$1.62	RS-422, RS-485
ADM3071E	+3	3.3	Full	15 kV	250kbps	256	No	Open, Short	---	SOIC	$1.57	RS-422, RS-485
ADM3488E	+3	3.3	Full	15 kV	250kbps	32	No	Open	---	SOIC	$1.32	RS-422, RS-485
ADM3488	+3	3.3	Full	---	250kbps	32	No	Open	---	SOIC	$0.91	RS-422, RS-485
ADM3074E	+3	3.3	Full	15 kV	500kbps	256	No	Open, Short	---	SOIC	$1.52	RS-422, RS-485
ADM3490	+3	3.3	Full	---	10Mbps	32	No	Open	---	SOIC	$1.01	RS-422, RS-485
ADM3491	+3	3.3	Full	---	10Mbps	32	Yes	Open	---	DIP, SOIC, SOP	$1.37	RS-422, RS-485
ADM3490E	+3	3.3	Full	15 kV	12Mbps	32	No	Open	---	SOIC	$1.37	RS-422, RS-485
ADM3491E	+3	3.3	Full	15 kV	12Mbps	32	Yes	Open	---	SOIC	$1.42	RS-422, RS-485
ADM3076E	+3	3.3	Full	15 kV	16Mbps	256	Yes	Open, Short	---	SOIC	$1.62	RS-422, RS-485
ADM3077E	+3	3.3	Full	15 kV	16Mbps	256	No	Open, Short	---	SOIC	$1.57	RS-422, RS-485
ADM3072E	+3	3.3	Half	15 kV	250kbps	256	Yes	Open, Short	---	SOIC	$1.52	RS-422, RS-485
ADM3483E	+3	3.3	Half	15 kV	250kbps	32	Yes	Open	---	SOIC	$1.32	RS-422, RS-485
ADM3493	+3	3.3	Half	---	250kbps	256	Yes	Open	---	SOIC	$0.96	RS-422, RS-485
ADM3483	+3	3.3	Half	---	250kbps	32	Yes	Open	---	SOIC	$0.91	RS-422, RS-485
ADM3073E	+3	3.3	Half	15 kV	500kbps	256	Yes	Open, Short	---	SOIC	$1.62	RS-422, RS-485
ADM3075E	+3	3.3	Half	15 kV	500kbps	256	Yes	Open, Short	---	SOIC	$1.52	RS-422, RS-485
ADM3486E	+3	3.3	Half	15 kV	2.5Mbps	32	Yes	Open	---	SOIC	$1.32	RS-422, RS-485
ADM3485	+3	3.3	Half	---	10Mbps	32	Yes	Open	---	SOIC	$1.01	RS-422, RS-485
ADM3485E	+3	3.3	Half	15 kV	12Mbps	50	Yes	Open	---	DIP, SOIC	$1.32	RS-422, RS-485
ADM3078E	+3	3.3	Half	15 kV	16Mbps	256	Yes	Open, Short	---	SOIC	$1.55	RS-422, RS-485
ADM488	+4.5	5	Full	---	250kbps	32	No	Open	---	DIP, SOIC	$1.11	RS-422, RS-485
ADM489	+4.5	5	Full	---	250kbps	32	Yes	Open	---	DIP, SOIC, SOP	$1.62	RS-422, RS-485
ADM483E	+4.5	5	Half	15 kV	250kbps	32	Yes	Open	---	DIP, SOIC	$1.27	RS-422, RS-485
ADM4854	+4.75	5	Full	---	115kbps	256	No	Open, Short	---	SOIC	$0.71	RS-422, RS-485
ADM4855	+4.75	5	Full	---	500kbps	256	No	Open, Short	---	SOIC	$0.71	RS-422, RS-485
ADM4856	+4.75	5	Full	---	2.5Mbps	256	No	Open, Short	---	SOIC	$0.71	RS-422, RS-485
ADM4857	+4.75	5	Full	---	10Mbps	256	No	Open, Short	---	SOIC	$0.71	RS-422, RS-485
ADM4850	+4.75	5	Half	---	115kbps	256	Yes	Open, Short	---	CSP, SOIC	$0.71	RS-422, RS-485
ADM487E	+4.75	5	Half	15 kV	250kbps	128	Yes	Open	---	SOIC	$1.32	RS-422, RS-485
ADM483	+4.75	5	Half	---	250kbps	32	Yes	Open	---	SOIC	$0.67	RS-422, RS-485
ADM4851	+4.75	5	Half	---	500kbps	256	Yes	Open, Short	---	CSP, SOIC	$0.71	RS-422, RS-485
ADM1487E	+4.75	5	Half	15 kV	2.5Mbps	128	Yes	Open	---	SOIC	$1.32	RS-422, RS-485
ADM485E	+4.75	5	Half	15 kV	2.5Mbps	32	Yes	Open	---	SOIC	$1.32	RS-422, RS-485
ADM4852	+4.75	5	Half	---	2.5Mbps	256	Yes	Open, Short	---	CSP, SOIC	$0.71	RS-422, RS-485
ADM485	+4.75	5	Half	---	5Mbps	32	Yes	Open	---	DIP, SOIC, SOP	$1.31	RS-422, RS-485
ADM4853	+4.75	5	Half	---	10Mbps	256	Yes	Open, Short	---	CSP, SOIC	$0.71	RS-422, RS-485
ADM1486	+4.75	5	Half	---	30Mbps	50	Yes	Open	---	SOIC	$2.07	RS-422, RS-485
ADM1485	+4.75	5	Half	---	30Mbps	32	Yes	Open	---	DIP, SOIC, SOP	$1.63	RS-422, RS-485

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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