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PDF ADM2487E Data sheet ( Hoja de datos )
| Número de pieza | ADM2487E | |
| Descripción | 2.5 kV Isolated RS-485 Transceivers | |
| Fabricantes | Analog Devices | |
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2.5 kV Isolated RS-485 Transceivers with
Integrated Transformer Driver
ADM2482E/ADM2487E
FEATURES
Isolated RS-485/RS-422 transceivers, configurable as half
duplex or full duplex
Integrated oscillator driver for external transformer
±15 kV ESD protection on RS-485 input/output pins
Complies with TIA/EIA-485-A-98 and ISO 8482:1987(E)
Data rate: 500 kbps/16 Mbps
5 V or 3.3 V operation (VDD1)
256 nodes on bus
True fail-safe receiver inputs
Safety and regulatory approvals
UL recognition: 2500 V rms for 1 minute per UL 1577
VDE certificates of conformity
DIN VVDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 560 V peak
Thermal shutdown protection
Operating temperature range: −40°C to +85°C
Wide-body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
Multipoint data transmission systems
GENERAL DESCRIPTION
The ADM2482E/ADM2487E are isolated data transceivers with
±15 kV ESD protection and are suitable for high speed, half-
duplex or full-duplex communication on multipoint transmission
lines. For half-duplex operation, the transmitter outputs and
receiver inputs share the same transmission line. Transmitter
Output Pin Y is linked externally to Receiver Input Pin A, and
Transmitter Output Pin Z to Receiver Input Pin B. The parts are
designed for balanced transmission lines and comply with
TIA/EIA-485-A-98 and ISO 8482:1987(E).
The devices employ the Analog Devices, Inc., iCoupler®
technology to combine a 3-channel isolator, a three-state
differential line driver, and a differential input receiver into a
single package. An on-chip oscillator outputs a pair of square
waveforms that drive an external transformer to provide isolated
FUNCTIONAL BLOCK DIAGRAM
VDD1
D1 D2
VDD2
OSC
DE
Y
TxD
Z
RxD
RE
A
B
GND1
Figure 1.
GND2
power. The logic side of the device is powered with either a 5 V
or a 3.3 V supply, and the bus side is powered with an isolated
3.3 V supply.
The ADM2482E/ADM2487E driver has an active high enable,
and the receiver has an active low enable. The driver output
enters a high impedance state when the driver enable signal
is low. The receiver output enters a high impedance state when
the receiver enable signal is high.
The device has current-limiting and thermal shutdown features
to protect against output short circuits and situations where bus
contention might cause excessive power dissipation. The part is
fully specified over the industrial temperature range of −40°C to
+85°C and is available in a 16-lead, wide-body SOIC package.
Rev. A
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2008–2009 Analog Devices, Inc. All rights reserved.
1 page  
ADM2482E/ADM2487E
PACKAGE CHARACTERISTICS
Table 4.
Parameter
Resistance (Input-to-Output)1
Capacitance (Input-to-Output)1
Input Capacitance2
Input IC Junction-to-Case Thermal Resistance
Output IC Junction-to-Case Thermal Resistance
Symbol Min Typ Max Unit Test Conditions
RI-O 1012 Ω
CI-O 3 pF f = 1 MHz
CI 4 pF
θJCI 33 °C/W Thermocouple located at center of
package underside
θJCO 28 °C/W Thermocouple located at center of
package underside
1 Device considered a 2-terminal device: Pin 1 to Pin 8 are shorted together, and Pin 9 to Pin 16 are shorted together.
2 Input capacitance is from any input data pin to ground.
REGULATORY INFORMATION
Table 5. ADM2482E/ADM2487E Approvals
Organization Approval Type
UL Recognized under the component recognition
program of underwriters laboratories, Inc.
VDE Certified according to DIN V VDE V 0884-10
(VDE V 0884-10):2006-12
Notes
In accordance with UL 1577, each ADM2482E/ADM2487E is proof
tested by applying an insulation test voltage ≥3000 V rms for 1 second
(current leakage detection limit = 5 μA)
In accordance with DIN V VDE V 0884-10, each ADM2482E/ADM2487E
is proof tested by applying an insulation test voltage ≥1050 V peak for
1 second (partial discharge detection limit = 5 pC)
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 6.
Parameter
Rated Dielectric Insulation Voltage
Minimum External Air Gap (External Clearance)
Minimum External Tracking (Creepage)
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index)
Isolation Group
Symbol
L(I01)
L(I02)
CTI
Value
2500
5.15 min
5.5 min
0.017 min
>175
IIIa
Unit
V rms
mm
mm
mm
V
Conditions
1-minute duration
Measured from input terminals to output terminals,
shortest distance through air
Measured from input terminals to output terminals,
shortest distance along body
Insulation distance through insulation
DIN IEC 112/VDE 0303-1
Material group (DIN VDE 0110: 1989-01, Table 1)
Rev. A | Page 5 of 20
5 Page 
T
TxD
1
Z, B
2 Y, A
RxD
4
CH1 2.00V CH2 2.00V
CH3 2.00V CH4 2.00V
M 200ns
A CH2 1.72V
T 47.80%
Figure 15. ADM2487E Driver/Receiver Propagation Delay, Low to High
(RDIFF = 54 Ω, CL1 = CL2 = 100 pF)
T
TxD
1
2
Z, B
Y, A
RxD
4
CH1 2.00V CH2 2.00V
CH3 2.00V CH4 2.00V
M 200ns
A CH2 1.72V
T 48.60%
Figure 16. ADM2487E Driver/Receiver Propagation Delay, High to Low
(RDIFF = 54 Ω, CL1 = CL2 = 100 pF)
ADM2482E/ADM2487E
TxD
1
Z, B
2
Y, A
RxD
4
CH1 2.0V Ω CH2 2.0V Ω
CH3 2.0V Ω CH4 2.0V Ω
M 40.0ns 1.25GS/s IT 16.0ps/pt
A CH2 1.68V
Figure 17. ADM2482E Driver/Receiver Propagation Delay, High to Low
(RDIFF = 54 Ω, CL1 = CL2 = 100 pF)
TxD
1
Z, B
2
Y, A
RxD
4
CH1 2.0V Ω CH2 2.0V Ω
CH3 2.0V Ω CH4 2.0V Ω
M 40.0ns 1.25GS/s IT 16.0ps/pt
A CH2 1.68V
Figure 18. ADM2482E Driver/Receiver Propagation Delay, Low to High
(RDIFF = 54 Ω, CL1 = CL2 = 100 pF)
Rev. A | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADM2487E.PDF ] | |
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