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PDF ADM2485 Data sheet ( Hoja de datos )
| Número de pieza | ADM2485 | |
| Descripción | High Speed Isolated RS-485 Transceiver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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High Speed, Isolated RS-485 Transceiver
with Integrated Transformer Driver
ADM2485
FEATURES
Half-duplex, isolated RS-485 transceiver
Integrated oscillator driver for external transformer
PROFIBUS® compliant
Complies with ANSI/TIA/EIA RS-485-A-98 and
ISO 8482:1987(E)
Data rate: 16 Mbps
5 V or 3.3 V operation (VDD1)
50 nodes on bus
High common-mode transient immunity: >25 kV/μs
Isolated DE OUT status output
Thermal shutdown protection
Safety and regulatory approvals
UL recognition: 2500 V rms for 1 minute per UL 1577
VDE Certificate of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
Reinforced insulation, VIORM = 560 V peak
Operating temperature range: –40°C to +85°C
Wide-body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
PROFIBUS networks
Industrial field networks
Multipoint data transmission systems
GENERAL DESCRIPTION
The ADM2485 differential bus transceiver is an integrated,
galvanically isolated component designed for bidirectional data
communication on multipoint bus transmission lines. It is
designed for balanced transmission lines and complies with
ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E).
The device employs 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 power with an external
transformer. The logic side of the device can be powered with
either a 5 V or a 3.3 V supply, and the bus side is powered with
an isolated 5 V supply.
FUNCTIONAL BLOCK DIAGRAM
VDD1 D1 D2
VDD2
RTS
OSC
ADM2485
DE OUT
TxD
RxD
RE
GND1
GND2
Figure 1.
A
B
The ADM2485 driver has an active high enable. The driver
differential outputs and the receiver differential inputs are
connected internally to form a differential input/output port
that imposes minimal loading on the bus when the driver is
disabled or when VDD1 or VDD2 = 0 V. Also provided is an active
high receiver disable that causes the receive output to enter a
high impedance state.
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 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
©2007 Analog Devices, Inc. All rights reserved.
1 page  
ADM2485
Parameter
POWER SUPPLY CURRENT
Logic Side
Bus Side
COMMON-MODE TRANSIENT IMMUNITY1
HIGH FREQUENCY COMMON-MODE
NOISE IMMUNITY
Min Typ Max Unit Test Conditions/Comments
2.5 mA RTS = 0 V, VDD1 = 5.5 V
2.3 mA 2.5 Mbps, VDD1 = 5.5 V, see Figure 23
5.0 6.5 mA 16 Mbps, VDD1 = 5.5 V, see Figure 23
1.26 mA RTS = 0 V, VDD1 = 3.3 V
1.5 mA 2.5 Mbps, VDD1 = 3.3 V, see Figure 23
2.9 mA 16 Mbps, VDD1 = 3.3 V, see Figure 23
1.7 2.5 mA RTS = 0 V
49.0 mA 2.5 Mbps, RTS = VDD1, see Figure 23 for
load conditions
55.0 75.0 mA 16 Mbps, RTS = VDD1, see Figure 23 for
load conditions
25 kV/μs Transient magnitude = 800 V, VCM = 1 kV
100 mV VHF = +5 V, −2 V < VTEST2 < +7 V,
1 MHz < fTEST < 50 MHz, see Figure 24
1 CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. VCM is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.
Rev. A | Page 4 of 20
5 Page 
ADM2485
TYPICAL PERFORMANCE CHARACTERISTICS
2.40
2.35
2.30
IDD1_RE_ENABLE_VDD1 = 5.5V
2.25
2.20
2.15
2.10
2.05
IDD2_DE_ENABLE_VDD1 = 5.5V
2.00
–40
–20
0
20 40 60 80
TEMPERATURE (°C)
Figure 7. Unloaded Supply Current vs. Temperature
5.0
4.5 IDD1_PROFIBUS LOAD_TxD = 16Mbps_VDD1 = 5.00V
4.0
3.5
IDD1_NO LOAD_TxD = 16Mbps_VDD1 = 5.00V
3.0
2.5 IDD1_PROFIBUS LOAD_TxD = 2Mbps_VDD1 = 5.00V
2.0
1.5 IDD1_NO LOAD_TxD = 2Mbps_VDD1 = 5.00V
1.0
0.5
0
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
Figure 8. Logic Side Supply Current (IDD1 = 1 mA) vs. Temperature
60
IDD2_ PROFIBUS LOAD_TxD = 16Mbps_VDD2 = 5.00V
50
40 IDD2_PROFIBUS LOAD_TxD = 2Mbps_VDD2 = 5.00V
30
20
IDD2_NO LOAD_TxD = 16Mbps_VDD2 = 5.00V
10
IDD2_NO LOAD_TxD = 2Mbps_VDD2 = 5.00V
0
–40 –20
0
20 40
TEMPERATURE (°C)
60
80
Figure 9. Bus Side Supply Current (IDD2 = 2 mA) vs. Temperature
60
50
tPLHA
tPHLB
40
30
tPLHB
tPHLA
20
10
0
–40 –20
0 20 40
TEMPERATURE (°C)
60
80
Figure 10. Driver Propagation Delay vs. Temperature
60
Rx PROP DELAY, tPLH_VDD2 = 5.00V
50
40 Rx PROP DELAY, tPHL_VDD2 = 5.00V
30
20
10
0
–40 –20
0 20 40
TEMPERATURE (°C)
60
80
Figure 11. Receiver Propagation Delay vs. Temperature
DI
3
B
A
2
CH1 2.0V Ω CH2 2.0V Ω M20.0ns 1.25GS/s A CH3 2.60V
CH3 2.0V Ω
IT 8.0ps/pt
Figure 12. Driver/Receiver Propagation Delay, Low to High
(RLDIFF = 54 Ω, CL1 = CL2 = 100 pF)
Rev. A | Page 10 of 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ADM2485.PDF ] | |
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