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PDF ADM2490E Data sheet ( Hoja de datos )
| Número de pieza | ADM2490E | |
| Descripción | Isolated RS-485 Transceiver | |
| Fabricantes | Analog Devices | |
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High Speed, ESD-Protected, Full-Duplex,
iCoupler®, Isolated RS-485 Transceiver
ADM2490E
FEATURES
Isolated, full-duplex RS-485/RS-422 transceiver
±8 kV ESD protection on RS-485 input/output pins
16 Mbps data rate
Complies with ANSI TIA/EIA RS-485-A-1998 and
ISO 8482: 1987(E)
Suitable for 5 V or 3 V operation (VDD1)
High common-mode transient immunity: >25 kV/μs
Receiver has open-circuit, fail-safe design
32 nodes on the bus
Thermal shutdown protection
Safety and regulatory approvals pending
UL recognition: 5000 V rms isolation voltage
for 1 minute per UL 1577
VDE certificate of conformity
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
VIORM = 848 VPEAK
Operating temperature range: −40°C to +105°C
Wide-body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
INTERBUS
Multipoint data transmission systems
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
ADM2490E
Y
TxD
Z
A
RxD
B
GND1
GND2
Figure 1.
GENERAL DESCRIPTION
The ADM2490E is an isolated data transceiver with ±8 kV ESD
protection and is suitable for high speed, full-duplex
communication on multipoint transmission lines. It is designed
for balanced transmission lines and complies with ANSI
TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device
employs Analog Devices, Inc., iCoupler technology to combine
a 2-channel isolator, a 3-state differential line driver, and a
differential input receiver into a single package.
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to
±8 kV using the human body model (HBM). The logic side of
the device can be powered with either a 5 V or a 3 V supply,
whereas the bus side requires an isolated 5 V supply.
The device has current-limiting and thermal shutdown features
to protect against output short circuits and situations where bus
contention could cause excessive power dissipation.
Rev. 0
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
©2006 Analog Devices, Inc. All rights reserved.
1 page  
ADM2490E
ADM2490E CHARACTERISTICS
PACKAGE CHARACTERISTICS
Table 4.
Parameter
Resistance (Input-Output)1
Capacitance (Input-Output)1
Input Capacitance2
Input IC Junction-to-Case Thermal Resistance
Output IC Junction-to-Case Thermal Resistance
Symbol
RI-O
CI-O
CI
θJCI
θJCO
Min Typ Max Unit Test Conditions
1012 Ω
3 pF f = 1 MHz
4 pF
33 °C/W Thermocouple located at center
of package underside
28 °C/W
1 Device considered a 2-terminal device: Pins 1, 2, 3, 4, 5, 6, 7, and 8 are shorted together and Pins 9, 10, 11, 12, 13, 14, 15, and 16 are shorted together.
2 Input capacitance is from any input data pin to ground.
REGULATORY INFORMATION (PENDING)
Table 5.
UL
To be recognized under 1577 component recognition program: 1
5000 V rms isolation voltage
VDE
To be certified according to DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01: 2
Basic insulation, 848 V peak
Complies with DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01,
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000, reinforced
insulation, 560 V peak
1 In accordance with UL1577, each ADM2490E is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 second (current leakage detection limit = 10 μA).
2 In accordance with DIN EN 60747-5-2, each ADM2490E is proof tested by applying an insulation test voltage ≥ 1590 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 (Clearance)
Symbol
L(I01)
Value
5000
7.45
Minimum External Tracking (Creepage)
L(I02)
8.1
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index) CTI
Isolation Group
0.017
>175
IIIa
Unit
V rms
mm min
mm min
mm min
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 Part 1.
Material Group (DIN VDE 0110, 1/89).
Rev. 0 | Page 5 of 16
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
3.00
2.95
2.90
2.85
NO LOAD
100 LOAD
220-100-220 LOAD
2.80
2.75
2.70
–40
–20
0 20 40 60
TEMPERATURE (°C)
80 100
Figure 10. IDD1 Supply Current vs. Temperature (See Figure 5)
ADM2490E
60
50 tPLH
tPHL
40
30
20
10
0
–40
–20
0 20 40 60
TEMPERATURE (°C)
80 100
Figure 13. Receiver Propagation Delay vs. Temperature
70
60
220-100-220 LOAD
50
40
100 LOAD
30
20
10 NO LOAD
0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
Figure 11. IDD2 Supply Current vs. Temperature (See Figure 5)
TxD
1
Y AND Z OUTPUTS
2
RxD
4
CH1 2V CH2 2V
CH3 2V CH4 2V
M20ns
A CH2
T 44.2%
2.84V
Figure 14. Driver/Receiver Propagation Delay, Low to High
(RLDIFF = 54 Ω, CL1 = CL2 = 100 pF)
60 TPZHL
TPYLH
TPZLH
50 TPYHL
40
30
20
10
0
–40
–20
0 20 40 60
TEMPERATURE (°C)
80 100
Figure 12. Driver Propagation Delay vs. Temperature
TxD
1
Y AND Z OUTPUTS
2
RxD
4
CH1 2V CH2 2V
CH3 2V CH4 2V
M20ns
A CH2
T 44.2%
2.84V
Figure 15. Driver/Receiver Propagation Delay, High to Low
(RLDIFF = 54 Ω, CL1 = CL2 = 100 pF)
Rev. 0 | Page 11 of 16
11 Page | ||
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| PDF Descargar | [ Datasheet ADM2490E.PDF ] | |
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