adm3085jr Analog Devices, Inc., adm3085jr Datasheet

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adm3085jr

Manufacturer Part Number
adm3085jr
Description
Transceivers With Slew-rate-limiting And ?15kv Esd Protection
Manufacturer
Analog Devices, Inc.
Datasheet

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a
FEATURES
APPLICATIONS
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.
REV. PrA 02/02
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
Enhanced Replacement for Industry-Standard Parts
Level Translation
LANs for Industrial Control Applications
EMI-Sensitive Systems
PRELIMINARY TECHNICAL DATA
High-Speed (10Mbps), Fail-Safe, RS-485/RS-422
FUNCTIONAL BLOCK DIAGRAM
RO
4 -
DE
DI
AD M 30 82/A D M 308 5/AD M 3088
1
2
3
4
Transceivers with Slew-Rate-Limiting
D
R
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 in-
puts 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 error-
free 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 dis-
charge (ESD) protection and high receiver input imped-
ance (1/8 unit load), allowing up to 256 transceivers on
the bus. The devices have low current drain of 375µA un-
loaded, or fully loaded with the drivers disabled, and fea-
ture an ultra-low power (1nA) shutdown mode.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
ADM3082/ADM3085/ADM3088
8
7
6
5
V
B
A
G ND
C C
and ±15kV ESD Protection
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 2002

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adm3085jr Summary of contents

Page 1

... 82 308 5/AD M 3088 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 and ±15kV ESD Protection World Wide Web Site: http://www.analog.com © Analog Devices, Inc., 2002 ...

Page 2

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 ADM3082/ADM3085/ADM3088 SPECIFICATIONS DC ELECTRICAL CHARACTERISTICS (V = +5V ±5 unless otherwise noted. Typical values are MIN MAX DRIVER Parameter Differential Driver Output, V OD1 Differential Driver ...

Page 3

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued) DC ELECTRICAL CHARACTERISTICS (V = +5V ±5 unless otherwise noted. Typical values are MIN MAX RECEIVER Parameter Receiver Differential Threshold Voltage Receiver ...

Page 4

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued) SWITCHING CHARACTERISTICS—ADM3082 (V = +5V ±5 unless otherwise noted. Typical values are MIN MAX Parameter Driver Input-to-Output, t DPLH Driver Input-to-Output, t DPHL ...

Page 5

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued) SWITCHING CHARACTERISTICS—ADM3085 (V = +5V ±5 unless otherwise noted. Typical values are MIN MAX Parameter Driver Input-to-Output, t DPLH Driver Input-to-Output, t DPHL Driver ...

Page 6

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued) SWITCHING CHARACTERISTICS—ADM3088 (V = +5V ±5 unless otherwise noted. Typical values are MIN MAX Parameter Driver Input-to-Output, t DPLH Driver Input-to-Output, t DPHL ...

Page 7

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 TEST CIRCUITS AND TIMING Figure 1. Driver DC Load Test Circuit IFF Figure 2. Test Load for Driver Timing Tests ...

Page 8

... CC +0.3V) CC Model max 150 °C J ADM3082JN ADM3082JR ADM3082AN –40°C to +85°C ADM3082AR ADM3085JN ADM3085JR ADM3085AN –40°C to +85°C ADM3085AR ADM3088JN ADM3088JR ADM3088AN –40°C to +85°C ADM3088AR TPC2. Output Current vs. Receiver Out- put High Voltage – 8 – ...

Page 9

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 TYPICAL PERFORMANCE CHARACTERISTICS (continued) TPC4. Receiver Output High Voltage vs. Temperature TPC7. ADM3082 Driver Propagation Delay vs. Temperature TPC10. ADM3082/5 ReceIver Propagation Delay vs. Temperature REV. PrA 02/02 ADM3082/ADM3085/ADM3088 TPC5. Receiver Output Low Voltage vs. Temperature ...

Page 10

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 ADM3082/ADM3085/ADM3088 TYPICAL PERFORMANCE CHARACTERISTICS (continued) TPC13. Driver Output Current vs. Dif- ferential Output Voltage TPC16. ADM3082 Driver Propagation Delay TPC19. ADM3082/5 Receiver Propaga- tion Delay TPC14. Output Current vs. Driver Out- put High Voltage TPC17. ADM3085 ...

Page 11

PRELIMINARY TECHNICAL DATA PIN FUNCTION DESCRIPTION Pin Mnemonic Description Receiver Output. When 4- is low and When 4- is low and A – Receiver Output Enable. Take 4- low to enable ...

Page 12

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 DETAILED DESCRIPTION The ADM3082, ADM3085 and ADM3088 are high- speed RS-485/RS-422 transceivers offering enhanced per- formance over industry-standard devices All devices in the family contain one driver and one receiver, but there is a choice of ...

Page 13

PRELIMINARY TECHNICAL DATA CURRENT LIMIT AND THERMAL SHUTDOWN The ADM3082/ADM3085/ADM3088 incorporate two protection mechanisms to guard the drivers against short- circuits, bus contention or other fault conditions. The first is a foldback current-limited output stage that protects the driver against ...

Page 14

PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 Figure 13. Driver Input, Driver Output and Receiver Output Waveforms of ADM3085, Driving 4000ft (1219m) of Cable at 50kHz Figure 14. Driver Input, Driver Output and Receiver Output Waveforms of ADM3088, Driving 4000ft (1219m) of Cable ...

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