Enhanced Slew Rate Limiting for Error-Free Data
Transmission
Fail-Safe Receiver Operation while Maintaining
EIA/TIA-485 compatibility
Low-Current (1nA) Shutdown Mode
High Input Impedance — Up to 256 Transceivers on Bus
±15kV ESD Protection (Human Body Model) on
RS-485 I/O pins
Pin-Compatible with Industry Standard 75176
APPLICATIONS
Enhanced Replacement for Industry-Standard Parts
EMI-Sensitive Systems
Level Translation
LANs for Industrial Control Applications
and ±15kV ESD Protection
ADM3082/ADM3085/ADM3088
GENERAL DESCRIPTION
The ADM3082/ADM3085/ADM3088 are high-speed
RS-485/RS-422 transceivers consisting of one driver and one
receiver per package. The devices feature fail-safe operation,
ensuring a logic-high receiver output when the receiver inputs are open-circuit or short-circuit. This guarantees that
the receiver output will be high if all the transmitters on a
terminated bus are disabled (high-impedance).
The ADM3082 has a slew-rate limited driver to minimize
electromagnetic interference (EMI) and reduce reflections
caused by incorrectly terminated cables. This allows errorfree transmission at data rates up to 115kbps.
The ADM3085 offers a higher slew rate allowing data rates
up to 500kbps, while the ADM3088 has a driver whose slew
rate is not limited, allowing data rates up to 10Mbps.
All devices in the family feature ±15kV electrostatic discharge (ESD) protection and high receiver input impedance (1/8 unit load), allowing up to 256 transceivers on
the bus. The devices have low current drain of 375µA unloaded, or fully loaded with the drivers disabled, and feature an ultra-low power (1nA) shutdown mode.
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.
, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
MAX
Receiver Differential Threshold–200–125–50mV–7V # V
Voltage, V
Receiver Input Hysteresis, DV
Receiver Output High Voltage, V
Receiver Output Low Voltage, V
TH
TH
OL
OH
25mV
VCC –1 .5VIO = -4mA, VID = -50mV
0.4VIO = 4mA, VID = -200mV
# 12V
CM
Three-State Output Current at±1µA0.4V # VO # 2.4V
Receiver, I
Receiver Input Resistance, R
Receiver Output Short-Circuit±7±95mA0V # VRO # V
Current, I
OZR
OSR
IN
96kV–7V # VCM # 12V
CC
SUPPLY CURRENT
ParameterMinTypMaxUnits Test Conditions/Comments
Supply Current, I
CC
430900µANo load, RE = DI = GND or VCC,
DE = V
CC
375600µANo load, RE = DI = GND or VCC,
DE = GND
Supply Current in0.00110µ ADE = GND, VRE = V
Shutdown Mode, I
SHDN
CC
ESD Protection for Y, Z, A, B±15kVHuman Body Model
NOTES
1
All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground unless otherwise noted.
2
DDO and DVCC are the changes in VOD and VOC, respectively, when the DI input changes state.
3
Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during current limiting.