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3.3 V, 15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
FEATURES
TIA/EIA RS-485/RS-422 compliant 15 kV ESD protection on RS-485 input/output pins Data rates ADM3483E/ADM3488E: 250 kbps ADM3486E: 2.5 Mbps ADM3490E/ADM3491E: 12 Mbps Half- and full-duplex options Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current (ADM3483E/ADM3486E/ADM3491E only) Outputs high-Z when disabled or powered off Common-mode input range: -7 V to +12 V Thermal shutdown and short-circuit protection Industry-standard 75176 pinout 8-lead and 14-lead narrow SOIC packages
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADM3483E/ ADM3486E
RO RE DE DI D
06284-001
R A B
GND
Figure 1.
VCC
ADM3488E/ ADM3490E
RO R A
B
APPLICATIONS
Power/energy metering Telecommunications EMI-sensitive systems Industrial control Local area networks
DI D Z Y
06284-002
GND
Figure 2.
VCC
GENERAL DESCRIPTION
The ADM3483E/ADM3486E/ADM3488E/ADM3490E/ ADM3491E are 3.3 V, low power data transceivers with 15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission, and they comply with TIA/EIA standards RS485 and RS-422. The ADM3483E/ADM3486E are half-duplex transceivers that share differential lines and have separate enable inputs for the driver and receiver. The full-duplex ADM3488E/ ADM3490E/ADM3491E transceivers have dedicated differential line driver outputs and receiver inputs. The ADM3491E also features separate enable inputs for the driver and receiver. The devices have a 12 k receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus.
ADM3491E
RO RE DE DI D Z Y
06284-003
R
A
B
GND
Figure 3.
(continued on Page 3)
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. Trademarks and registered trademarks are the property of their respective owners.
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 (c)2006 Analog Devices, Inc. All rights reserved.
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 4 Driver Timing Specifications...................................................... 5 Receiver Timing Specifications .................................................. 6 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Test Circuits and Switching Characteristics.................................. 9 Typical Performance Characteristics ........................................... 11 Circuit Description......................................................................... 14 Devices with Receiver/Driver Enable--ADM3483E/ ADM3486E/ADM3491E ........................................................... 14 Devices Without Receiver/Driver EnableADM3488E/ ADM3490E ................................................................................. 14 Low Power Shutdown Mode--ADM3483E/ADM3486E / ADM3491E ................................................................................. 14 Driver Output Protection.......................................................... 14 Propagation Delay ...................................................................... 14 Line Length vs. Data Rate ......................................................... 14 15 kV ESD Protection ............................................................. 15 Human Body Model .................................................................. 15 Typical Applications................................................................... 15 Outline Dimensions ....................................................................... 18 Ordering Guide .......................................................................... 18
REVISION HISTORY
10/06--Rev. 0 to Rev. A Added ADM3483E and ADM3488E ...............................Universal Changes to Figure 1 and Figure 2................................................... 1 Inserted Table 3................................................................................. 5 Changes to Figure 4 and Figure 5................................................... 8 Inserted Figure 28 and Figure 29.................................................. 13 Changes to Figure 31 and Figure 32............................................. 16 Changes to Figure 34...................................................................... 17 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 8/06--Revision 0: Initial Version
Rev. A | Page 2 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E GENERAL DESCRIPTION
(continued from Page 1) The driver outputs of the ADM3483E/ADM3486E/ ADM3488E are slew rate limited, in order to reduce EMI and data errors caused by reflections from improperly terminated buses. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating. Table 1. Selection Table
Part No. ADM3483E ADM3486E ADM3488E ADM3490E ADM3491E Guaranteed Data Rate (Mbps) 0.25 2.5 0.25 12 12 Supply Voltage (V) 3.0 to 3.6 3.0 to 3.6 3.0 to 3.6 3.0 to 3.6 3.0 to 3.6 Half/Full Duplex Half Half Full Full Full Slew Rate Limited Yes Yes Yes No No Driver/Receiver Enable Yes Yes No No Yes 15 kV ESD Protection on Bus Pins Yes Yes Yes Yes Yes Pin Count 8 8 8 8 14
Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the industrial temperature range and are available in 8-lead and 14-lead narrow SOIC packages.
Rev. A | Page 3 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E SPECIFICATIONS
VCC = 3.3 V 0.3 V, TA = TMIN to TMAX, unless otherwise noted. Table 2. ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
Parameter DRIVER Differential Outputs Differential Output Voltage Symbol Min Typ Max Unit Test Conditions/Comments
VOD
2.0 1.5 1.5 0.2 3 0.2 -250 250
|VOD| for Complementary Output States1 Common-Mode Output Voltage |VOC| for Complementary Output States1 Short-Circuit Output Current Output Leakage (Y, Z) (ADM3491E Only) Normal Mode
VOD VOC VOC IOSD IO
V V V V V V mA mA A A
RL = 100 (RS-422) (see Figure 7) RL = 54 (RS-485) (see Figure 7) RL = 60 (RS-485) (see Figure 8) RL = 54 or 100 (see Figure 7) RL = 54 or 100 (see Figure 7) RL = 54 or 100 (see Figure 7) VOUT = -7 V VOUT = 12 V DE = 0 V, RE = 0 V, VCC = 0 V or 3.6 V, VOUT = 12 V DE = 0 V, RE = 0 V, VCC = 0 V or 3.6 V, VOUT = -7 V DE = 0 V, RE = VCC, VCC = 0 V or 3.6 V, VOUT = 12 V DE = 0 V, RE = VCC, VCC = 0 V or 3.6 V, VOUT = -7 V DE, DI, RE DE, DI, RE DE, DI, RE
20 -20
Shutdown Mode -1 Logic Inputs Input High Voltage Input Low Voltage Logic Input Current RECEIVER Differential Inputs Differential Input Threshold Voltage Input Hysteresis Input Resistance (A, B) Input Current (A, B) RO Logic Output Output High Voltage Output Low Voltage Short-Circuit Output Current Tristate Output Leakage Current POWER SUPPLY Voltage Range Supply Current
1
A A
VIH VIL IIN1
2.0 0.8 2
V V A
VTH VTH RIN IIN2
-0.2 50 12
0.2
1.0 -0.8
V mV k mA mA V V mA A V mA mA A kV kV
-7 V < VCM < +12 V VCM = 0 V -7 V < VCM < +12 V DE = 0 V, VCC = 0 V or 3.6 V, VIN = 12 V DE = 0 V, VCC = 0 V or 3.6 V, VIN = -7 V IOUT = -1.5 mA, VID = 200 mV (see Figure 9) IOUT = 2.5 mA, VID = 200 mV (see Figure 9) 0 V < VRO < VCC VCC = 3.6 V, 0 V < VOUT < VCC
VOH VOL IOSR IOZR VCC ICC
VCC - 0.4 8 0.4 60 1 3.6 2.2 1.9 1
3.0 1.1 0.95
Shutdown Current ESD PROTECTION A, B, Y, Z Pins All Pins Except A, B, Y, Z Pins
1
ISHDN
0.002 15 4
No load, DI = 0 V or VCC, DE = VCC, RE = 0 V or VCC No load, DI = 0 V or VCC, DE = 0 V, RE = 0 V DE = 0 V, RE = VCC, DI = 0 V or VCC Human body model Human body model
|VOD| and |VOC| are the changes in VOD and VOC, respectively, when DI input changes state.
Rev. A | Page 4 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
DRIVER TIMING SPECIFICATIONS
VCC = 3.3 V, TA = 25C. Table 3. ADM3483E/ADM3488E
Parameter MAXIMUM DATA RATE DIFFERENTIAL OUTPUT DELAY DIFFERENTIAL OUTPUT TRANSITION TIME PROPAGATION DELAY From Low to High Level From High to Low Level |tPLH - tPHL| PROPAGATION DELAY SKEW1 ENABLE/DISABLE TIMING (ADM3483E ONLY) Enable Time to Low Level Enable Time to High Level Disable Time from Low Level Disable Time from High Level Enable Time from Shutdown to Low Level Enable Time from Shutdown to High Level
1
Symbol tDD tTD tPLH tPHL tPDS tPZL tPZH tPLZ tPHZ tPSL tPSH
Min 250 600 400 700 700
Typ 900 740 930 930 50 900 600 50 50 1.9 2.2
Max 1400 1200 1500 1500
Unit kbps ns ns ns ns ns ns ns ns ns s s
Test Conditions/Comments RL = 60 (see Figure 10) RL = 60 (see Figure 10) RL = 27 (see Figure 11) RL = 27 (see Figure 11) RL = 27 (see Figure 11) RL = 110 (see Figure 13) RL = 110 (see Figure 12) RL = 110 (see Figure 13) RL = 110 (see Figure 12) RL = 110 (see Figure 13) RL = 110 (see Figure 12)
1300 800 80 80 2.7 3.0
Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|.
VCC = 3.3 V, TA = 25C. Table 4. ADM3486E
Parameter MAXIMUM DATA RATE DIFFERENTIAL OUTPUT DELAY DIFFERENTIAL OUTPUT TRANSITION TIME PROPAGATION DELAY From Low to High Level From High to Low Level |tPLH - tPHL| PROPAGATION DELAY SKEW 1 ENABLE/DISABLE TIMING Enable Time to Low Level Enable Time to High Level Disable Time from Low Level Disable Time from High Level Enable Time from Shutdown to Low Level Enable Time from Shutdown to High Level
1
Symbol tDD tTD tPLH tPHL tPDS tPZL tPZH tPLZ tPHZ tPSL tPSH
Min 2.5 20 15 20 20
Typ 42 28 42 42 -6 52 52 40 40 700 700
Max 70 60 75 75 12 100 100 80 80 1000 1000
Unit Mbps ns ns ns ns ns ns ns ns ns ns ns
Test Conditions/Comments RL = 60 (see Figure 10) RL = 60 (see Figure 10) RL = 27 (see Figure 11) RL = 27 (see Figure 11) RL = 27 (see Figure 11) RL = 110 (see Figure 13) RL = 110 (see Figure 12) RL = 110 (see Figure 13) RL = 110 (see Figure 12) RL = 110 (see Figure 13) RL = 110 (see Figure 12)
Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|.
Rev. A | Page 5 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
VCC = 3.3 V, TA = 25C. Table 5. ADM3490E/ADM3491E
Parameter MAXIMUM DATA RATE DIFFERENTIAL OUTPUT DELAY DIFFERENTIAL OUTPUT TRANSITION TIME PROPAGATION DELAY From Low to High Level From High to Low Level |tPLH - tPHL| PROPAGATION DELAY SKEW1 ENABLE/DISABLE TIMING (ADM3491E ONLY) Enable Time to Low Level Enable Time to High Level Disable Time from Low Level Disable Time from High Level Enable Time from Shutdown to Low Level Enable Time from Shutdown to High Level
1
Symbol tDD tTD tPLH tPHL tPDS tPZL tPZH tPLZ tPHZ tPSL tPSH
Min 12 1 3 7 7
Typ 15 22 11 23 23 -1.4 42 42 35 35 650 650
Max 35 25 35 35 8 90 90 80 80 900 900
Unit Mbps ns ns ns ns ns ns ns ns ns ns ns
Test Conditions/Comments RL = 60 (see Figure 10) RL = 60 (see Figure 10) RL = 27 (see Figure 11) RL = 27 (see Figure 11) RL = 27 (see Figure 11) RL = 110 (see Figure 13) RL = 110 (see Figure 12) RL = 110 (see Figure 13) RL = 110 (see Figure 12) RL = 110 (see Figure 13) RL = 110 (see Figure 12)
Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|.
RECEIVER TIMING SPECIFICATIONS
VCC = 3.3 V, TA = 25C. Table 6. ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
Parameter PROPAGATION DELAY From Low to High Level ADM3486E/ADM3490E/ADM3491E ADM3483E/ADM3488E From High to Low Level ADM3486E/ADM3490E/ADM3491E ADM3483E/ADM3488E |tRPLH - tRPHL| PROPAGATION DELAY SKEW ADM3486E/ADM3490E/ADM3491E ADM3483E/ADM3488E ENABLE/DISABLE TIMING (ADM3483E/ADM3486E/ ADM3491E ONLY) Enable Time to Low Level Enable Time to High Level Disable Time from Low Level Disable Time from High Level Enable Time from Shutdown to Low Level Enable Time from Shutdown to High Level Time to Shutdown1
1
Symbol tRPLH
Min
Typ
Max
Unit
Test Conditions/Comments
25 25 tRPHL 25 25 tRPDS
62 75 62 75 +6 +12
90 120 90 120 10 20
ns ns ns ns ns ns
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14) VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14) VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14) VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14) VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14) VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
tRPZL tRPZH tRPLZ tRPHZ tRPSL tRPSH tSHDN
80
25 25 25 25 720 720 190
50 50 45 45 1400 1400 300
ns ns ns ns ns ns ns
CL = 15 pF (see Figure 15) CL = 15 pF (see Figure 15) CL = 15 pF (see Figure 15) CL = 15 pF (see Figure 15) CL = 15 pF (see Figure 15) CL = 15 pF (see Figure 15)
The transceivers are put into shutdown mode by bringing the RE high and the DE low. If the inputs are in this state for less than 80 ns, the parts are guaranteed not to enter shutdown. If the parts are in this state for 300 ns or more, the parts are guaranteed to enter shutdown.
Rev. A | Page 6 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E ABSOLUTE MAXIMUM RATINGS
TA = 25C, unless otherwise noted. Table 7.
Parameter VCC to GND Digital Input/Output Voltage (DE, RE, DI) Receiver Output Voltage (RO) Driver Output (A, B, Y, Z)/Receiver Input (A, B) Voltage Driver Output Current Operating Temperature Range Storage Temperature Range JA Thermal Impedance 8-Lead SOIC_N 14-Lead SOIC_N Lead Temperature, Soldering (20 sec) Rating -0.3 V to +6 V -0.3 V to +6 V -0.3 V to (VCC + 0.3 V) -8 V to +13 V 250 mA -40C to +85C -65C to +150C 158C/W 120C/W 260C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
Rev. A | Page 7 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
NC 1 RO 2 RE 3 DE 4
14 VCC 13 VCC 12 A
ADM3491E
RO 1 RE 2 DE 3 DI 4
ADM3483E/ ADM3486E
TOP VIEW (Not to Scale)
8 7 6 5
VCC B
06284-004
VCC 1 RO 2 DI 3 GND 4
ADM3488E/ ADM3490E
TOP VIEW (Not to Scale)
8 7 6 5
A B
06284-005
11 B TOP VIEW DI 5 (Not to Scale) 10 Z 9 8
GND 6 GND 7
Y NC
06284-006
A GND
Z Y
NC = NO CONNECT
Figure 4. ADM3483E/ADM3486E Pin Configuration
Figure 5. ADM3488E/ADM3490E Pin Configuration
Figure 6. ADM3491E Pin Configuration
Table 8. Pin Function Descriptions
ADM3483E/ ADM3486E Pin No. 1 2 ADM3488E/ ADM3490E Pin No. 2 N/A ADM3491E Pin No. 2 3
Mnemonic RO RE
3
N/A
4
DE
4
3
5
DI
5 N/A 6 N/A N/A 7 N/A 8 N/A
4 5 N/A 8 6 N/A 7 1 N/A
6, 7 9 N/A 12 10 N/A 11 13, 14 1, 8
GND Y A A Z B B VCC NC
Description Receiver Output. If A > B by 200 mV, RO is high; if A < B by 200 mV, RO is low. Receiver Output Enable. A low level enables the receiver output. A high level places it in a high impedance state. If RE is high and DE is low, the device enters a low power shutdown mode. Driver Output Enable. A high level enables the driver differential A and B outputs. A low level places it in a high impedance state. If RE is high and DE is low, the device enters a low power shutdown mode. Driver Input. With a half-duplex part when the driver is enabled, a logic low on DI forces A low and B high; a logic high on DI forces A high and B low. With a full-duplex part when the driver is enabled, a logic low on DI forces Y low and Z high; a logic high on DI forces Y high and Z low. Ground. Noninverting Driver Output. Noninverting Receiver Input A and Noninverting Driver Output A. Noninverting Receiver Input A. Inverting Driver Output. Inverting Receiver Input B and Inverting Driver Output B. Inverting Receiver Input B. Power Supply, 3.3 V 0.3 V. Bypass VCC to GND with a 0.1 F capacitor. No Connect. Not internally connected. Can be connected to GND.
Rev. A | Page 8 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TEST CIRCUITS AND SWITCHING CHARACTERISTICS
Y RL/2 VOD RL/2 Z
06284-007
VOM RL = 27 S1
VOC
D GENERATOR1 50 VCC VOH + VOL 2
OUT CL = 15pF2
Figure 7. Driver Differential Output Voltage and Common-Mode Output Voltage
375 VCM = -7V TO +12V
06284-008
VOM =
1.5V
1PPR = 250kHz, 50% DUTY CYCLE, t 6.0ns, Z = 50. R O 2C INCLUDES PROBE AND STRAY CAPACITANCE. L
D VCC
VOD
RL 375
3V IN 1.5V 1.5V 0V
Figure 8. Driver Differential Output Voltage with Varying Common-Mode Voltage
Y OUT
tPLH
VOM
tPHL
VOH VOM VOL
VID 0
R
tPHL
VOL VOH
06284-009
tPLH
VOH
06284-011
IOL
(+)
IOH
(-)
Z OUT
VOM
VOM VOL
Figure 9. Receiver Output Voltage High and Output Voltage Low
Figure 11. Driver Propagation Delays
CL D GENERATOR1 50 VCC CL = 15pF2 RL = OUT 60
S1 0V OR 3V D CL = 50pF2 GENERATOR1 50 VOM = VOH + VOL 2 1.5V OUT RL = 110
1PPR = 250kHz, 50% DUTY CYCLE, t 6.0ns, Z = 50. R O 2C INCLUDES PROBE AND STRAY CAPACITANCE. L
1PPR = 250kHz, 50% DUTY CYCLE, t 6.0ns, Z = 50. R O 2C INCLUDES PROBE AND STRAY CAPACITANCE. L
+3V IN +1.5V +1.5V 0V
3V IN 1.5V 1.5V 0V
+2V
06284-010
tDD
50% 10% 90% 90%
tDD
tPZH
OUT VOM
tPHZ
06284-012
OUT
50% 10%
0.25V
VOH 0V
tTD
tTD
-2V
Figure 10. Driver Differential Output Delay and Transition Times
Figure 12. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)
Rev. A | Page 9 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
VCC RL = 110 S1 0V OR 3V D CL = 50pF2 GENERATOR1 50 OUT
VID GENERATOR1 50
R
OUT CL = 15pF2
1.5V 0V
1PPR = 250kHz, 50% DUTY CYCLE, t 6.0ns, Z = 50. R O 2C INCLUDES PROBE AND STRAY CAPACITANCE. L
VOM =
VCC 2
1PPR = 250kHz, 50% DUTY CYCLE, t 6.0ns, Z = 50. R O 2C INCLUDES PROBE AND STRAY CAPACITANCE. L
3V IN 1.5V 1.5V 0V
3V IN 1.5V 1.5V 0V
tPSL
OUT VOM
tPLZ
VCC 0.25V
06284-013
tRPLH
VOM
tRPHL
VCC VOM 0V
06284-014
VOL
OUT
Figure 13. Driver Enable and Disable Times (tPZL, tPSL, tPLZ)
Figure 14. Receiver Propagation Delays
+1.5V -1.5V
S3 VID R CL2 GENERATOR1 1k
S1 VCC S2
50
1PPR = 250kHz, 50% DUTY CYCLE, t 6.0ns, Z = 50. R O 2C INCLUDES PROBE AND STRAY CAPACITANCE. L
+3V IN +1.5V
tRPZH tRPSH
OUT +1.5V
0V VOH
S1 OPEN S2 CLOSED S3 = +1.5V
+3V IN +1.5V
tRPZL tRPSL
OUT +1.5V
0V
S1 CLOSED S2 OPEN S3 = -1.5V
VCC VOL
0V
+3V IN +1.5V 0V
S1 OPEN S2 CLOSED S3 = +1.5V
+3V IN +1.5V 0V
S1 CLOSED S2 OPEN S3 = -1.5V
tRPHZ
OUT +0.25V VOH OUT 0V +0.25V
tRPLZ
VCC VOL
Figure 15. Receiver Enable and Disable Times
Rev. A | Page 10 of 20
06284-015
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TYPICAL PERFORMANCE CHARACTERISTICS
25 0.8 0.7 IRO = 2.5mA
OUTPUT LOW VOLTAGE (V)
20
OUTPUT CURRENT (mA)
0.6 0.5 0.4 0.3 0.2 0.1
15
10
5
06284-021
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
10 TEMPERATURE (C)
60
85
OUTPUT LOW VOLTAGE (V)
Figure 16. Output Current vs. Receiver Output Low Voltage
-18 -16 -14
Figure 19. Receiver Output Low Voltage vs. Temperature
100 90 80
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
-12 -10 -8 -6 -4 -2
06284-022
70 60 50 40 30 20 10
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT HIGH VOLTAGE (V)
DIFFERENTIAL OUTPUT VOLTAGE (V)
Figure 17. Output Current vs. Receiver Output High Voltage
3.30
Figure 20. Driver Output Current vs. Differential Output Voltage
2.6
IRO = -1.5mA
3.25
DIFFERENTIAL OUTPUT VOLTAGE (V)
2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 -25 0 25 50
RL = 54
OUTPUT HIGH VOLTAGE (V)
3.20
3.15
3.10
3.05
06284-023
-25
0
25
50
75
75
TEMPERATURE (C)
TEMPERATURE (C)
Figure 18. Receiver Output High Voltage vs. Temperature
Figure 21. Driver Differential Output Voltage vs. Temperature
Rev. A | Page 11 of 20
06284-026
3.00 -50
1.6 -50
06284-025
0
0
06284-024
0
0 -40
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
120 0.9 0.8 100
SHUTDOWN CURRENT (A)
06284-027
0.7 0.6 0.5 0.4 0.3 0.2 0.1
06284-030
OUTPUT CURRENT (mA)
80
60
40
20
0
0
2
4
6
8
10
12
0 -50
-25
0
25
50
75
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (C)
Figure 22. Output Current vs. Driver Output Low Voltage
120
Figure 25. Shutdown Current vs. Temperature
100 OUTPUT CURRENT (mA)
DI
80
3
60
Y
40
20
CH1 CH2
Z
-6
-5
-4
-3
-2
-1
0
1
2
3
4
OUTPUT HIGH VOLTAGE (V)
Figure 23. Output Current vs. Driver Output High Voltage
1.2 1.1
SUPPLY CURRENT (mA)
06284-028
CH1 1.0V CH3 2.0V
CH2 1.0V
IT 400ps/pt A CH3 M20ns 1.25GS/s
1.44V
Figure 26. ADM3490E/ADM3491E Driver Propagation Delay
1.0
VA - VB M1
0.9 0.8 0.7
RO
0.6
3
06284-032
-10
20 TEMPERATURE (C)
50
80
06284-029
0.5 -40
CH3 2.0V M200ns 250MS/s MATH1 2.01V 200ns
4ns/pt
A CH2
1.24V
Figure 24. Supply Current vs. Temperature
Figure 27. ADM3490E/ADM3491E Receiver Propagation Delay, Driven by External RS-485 Device
Rev. A | Page 12 of 20
06284-031
0 -7
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
DI
3
VA - VB
Y
1
Z
06284-033
M
RO
06284-034
CH1 500mV CH3 5.0V
CH2 500mV
M2.0s 25.0MS/s A CH3 2.4V
40.0ns/pt
CH1 2.00V MATH 2.00V 20.0ms
M20.0ms
A CH1
40.0mV
Figure 28. ADM3483E/ADM3488E Driver Propagation Delay
Figure 29. ADM3483E/ADM3488E Receiver Propagation Delay
Rev. A | Page 13 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E CIRCUIT DESCRIPTION
The ADM34xxE are low power transceivers for RS-485 and RS422 communications. The ADM3483E/ADM3488E operate at data rates up to 250 kbps. The ADM3486E operates at data rates up to 2.5 Mbps, and the ADM3490E/ADM3491E transmit at up to 12 Mbps. The ADM3488E/ADM3490E/ADM3491E are fullduplex transceivers, and the ADM3483E/ADM3486E are half duplex. Driver enable (DE) and receiver enable (RE) pins are included on the ADM3483E/ADM3486E/ADM3491E. When disabled, the driver and receiver outputs are high impedance. Table 12. Receiving Truth Table
Receiving Input A-B +0.2 V -0.2 V Inputs open Receiving Output RO 1 0 1
LOW POWER SHUTDOWN MODE--ADM3483E/ ADM3486E/ADM3491E
The ADM3483E/ADM3486E/ADM3491E are put into a low power shutdown mode by bringing both RE high and DE low. The devices do not shut down unless both the driver and the receiver are disabled (high impedance). In shutdown mode, the devices typically draw less than 1 A of supply current. For these devices, the tPSH and the tPSL enable times assume the part was in the low power shutdown mode; the tPZH and the tPZL enable times assume the receiver or the driver was disabled, but the part was not shut down.
DEVICES WITH RECEIVER/DRIVER ENABLE-- ADM3483E/ADM3486E/ADM3491E
Table 9. Transmitting Truth Table
Transmitting Inputs DE DI RE X3 X3 0 1
1 2
Transmitting Outputs A1, Y2 B1, Z2 1 0 High-Z4 High-Z4 0 1 High-Z4 High-Z4
1 1 0 0
1 0 X3 X3
Mode Normal Normal Normal Shutdown
ADM3483E and ADM3486E only. ADM3491E only. 3 X = don't care. 4 High-Z = high impedance.
DRIVER OUTPUT PROTECTION
The ADM34xxE family implements two ways to prevent excessive output current and power dissipation caused by faults or by bus contention. A current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see the Typical Performance Characteristics section). In addition, a thermal shutdown circuit forces the driver outputs into a high impedance state if the die temperature rises excessively.
Table 10. Receiving Truth Table
RE 0 0 0 1
1 2
Receiving Inputs DE1 DE2 A - B 0 0 0 0 X3 X3 X3 X3 +0.2 V -0.2 V Inputs open X3
Receiving Output RO 1 0 1 High-Z4
Mode Normal Normal Normal Shutdown
PROPAGATION DELAY
Figure 11, Figure 14, Figure 26, and Figure 27 show the typical propagation delays. Skew time is simply the difference between the low-to-high and the high-to-low propagation delays. Small driver/receiver skew times help maintain a symmetrical markspace ratio (50% duty cycle). The receiver skew time, |tPRHL - tPRHL|, is under 10 ns (20 ns for the ADM3483E/ADM3488E). The driver skew time is 8 ns for the ADM3490E/ADM3491E, 12 ns for the ADM3486E, and typically under 50 ns for the ADM3483E/ADM3488E.
ADM3483E and ADM3486E only. ADM3491E only. 3 X = don't care. 4 High-Z = high impedance.
DEVICES WITHOUT RECEIVER/DRIVER ENABLE ADM3488E/ADM3490E
Table 11. Transmitting Truth Table
Transmitting Input DI 1 0 Z 0 1 Transmitting Outputs Y 1 0
LINE LENGTH VS. DATA RATE
The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, Figure 34 illustrates an example of a line repeater.
Rev. A | Page 14 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
15 kV ESD PROTECTION
Two coupling methods are used for ESD testing: contact discharge and air-gap discharge. Contact discharge calls for a direct connection to the unit being tested. Airgap discharge uses a higher test voltage but does not make direct contact with the test unit. With air-gap discharge, the discharge gun is moved toward the unit under test, developing an arc across the air gap, therefore the term airgap discharge. This method is influenced by humidity, temperature, barometric pressure, distance, and rate of closure of the discharge gun. The contact discharge method, while less realistic, is more repeatable and is gaining acceptance and preference over the airgap method. Although very little energy is contained within an ESD pulse, the extremely fast rise time, coupled with high voltages, can cause failures in unprotected semiconductors. Catastrophic destruction can occur immediately as a result of arcing or heating. Even if catastrophic failure does not occur immediately, the device can suffer from parametric degradation that can result in degraded performance. The cumulative effects of continuous exposure can eventually lead to complete failure. Input/output lines are particularly vulnerable to ESD damage. Simply touching or connecting an input/output cable can result in a static discharge that can damage or completely destroy the interface product connected to the input/output port. It is extremely important, therefore, to have high levels of ESD protection on the input/output lines. The ESD discharge can induce latch-up in the device under test, so it is important that ESD testing on the input/output pins be carried out while device power is applied. This type of testing is more representative of a real-world input/output discharge, which occurs when the equipment is operating normally. The transmitter outputs and receiver inputs of the ADM34xxE family are characterized for protection to a 15 kV limit using the human body model.
HIGH VOLTAGE GENERATOR R1 R2 DEVICE UNDER TEST C1 100pF
C1
ESD TEST METHOD HUMAN BODY MODEL ESD ASSOC. STD 55.1
R2 1.5k
100% 90%
36.8%
10%
IPEAK
tRL
tDL
TIME t
Figure 30. Human Body Model and Current Waveform
TYPICAL APPLICATIONS
The ADM3483E/ADM3486E/ADM3491E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. The ADM3488E/ADM3490E full-duplex transceiver is designed to be used in a daisy-chain network topology or in a point-to-point application (see Figure 32). The ADM3483E/ADM3486E are half-duplex RS-485 transceivers that can be used in a multidrop bus configuration, as shown in Figure 31. The ADM3488E/ADM3490E/ADM3491E can also be used as a line repeater, for use with cable lengths longer than 4000 feet, as shown in Figure 34. To minimize reflections, the line must be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible.
HUMAN BODY MODEL
Figure 30 shows the human body model and the current waveform it generates when discharged into a low impedance. This model consists of a 100 pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5 k resistor.
Rev. A | Page 15 of 20
06284-016
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
ADM3483E/ ADM3486E
RO RE DE DI D B B D R A RT RT A
ADM3483E/ ADM3486E
R RO RE DE DI
A
B
A
B
ADM3483E/ ADM3486E
ADM3483E/ ADM3486E
R
D
R
D
Figure 31. ADM3483E/ADM3486E Typical Half-Duplex RS-485 Network
MASTER
SLAVE
ADM3488E/ ADM3490E
A RO R B Z DI D Y A Z B Y
ADM3488E/ ADM3490E
D DI
Figure 32. ADM3488E/ADM3490E Full-Duplex Point-to-Point Applications
Rev. A | Page 16 of 20
06284-018
R
RO
06284-017
RO RE DE DI NOTES 1. MAXIMUM NUMBER OF TRANSCEIVERS ON BUS: 32. 2. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED.
RO
RE
DE
DI
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
MASTER SLAVE A B RT Y Z
ADM3491E
RO RE DE DI D R
ADM3491E
D
DE DI
Z Y RT
B A R RO RE
SLAVE
A
B
Z
Y
A
B
Z
Y
SLAVE
R
D
R
D
ADM3491E
RO RE DE DI RO RE DE DI NOTES 1. MAXIMUM NUMBER OF NODES: 32. 2. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED.
ADM3491E
Figure 33. ADM3491E Full-Duplex RS-485 Network
ADM3488E/ ADM3490E/ ADM3491E
RO RE DE DI D R
A B RT DATA IN
Z Y RT DATA OUT
Figure 34. Line Repeater for ADM3488E/ADM3490E/ADM3491E
Rev. A | Page 17 of 20
06284-020
NOTES 1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED. 2. RE AND DE PINS ON ADM3491E ONLY.
06284-019
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E OUTLINE DIMENSIONS
5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497)
8 1 5 4
6.20 (0.2440) 5.80 (0.2284)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099) 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157)
45
0.51 (0.0201) 0.31 (0.0122)
COMPLIANT TO JEDEC STANDARDS MS-012-A A CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 35. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches)
8.75 (0.3445) 8.55 (0.3366)
14 1 8 7
4.00 (0.1575) 3.80 (0.1496)
6.20 (0.2441) 5.80 (0.2283)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122)
1.75 (0.0689) 1.35 (0.0531) SEATING PLANE
0.50 (0.0197) 0.25 (0.0098) 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157)
45
COMPLIANT TO JEDEC STANDARDS MS-012-AB CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
060506-A
Figure 36. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model ADM3483EARZ 1 ADM3483EARZ-REEL71 ADM3486EARZ1 ADM3486EARZ-REEL71 ADM3488EARZ1 ADM3488EARZ-REEL71 ADM3490EARZ1 ADM3490EARZ-REEL71 ADM3491EARZ1 ADM3491EARZ-REEL71
1
Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
Package Description 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 8-Lead Standard Small Outline Package (SOIC_N) 14-Lead Standard Small Outline Package (SOIC_N) 14-Lead Standard Small Outline Package (SOIC_N)
Package Option R-8 R-8 R-8 R-8 R-8 R-8 R-8 R-8 R-14 R-14
060606-A
Ordering Quantity 1,000 1,000 1,000 1,000 1,000
Z = Pb-free part.
Rev. A | Page 18 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E NOTES
Rev. A | Page 19 of 20
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E NOTES
(c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06284-0-10/06(A)
Rev. A | Page 20 of 20

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