FEATURES
Dual transceivers for RS-422
ESD protection on bus input/output pins
±15 kV human body model (HBM)
±8 kV IEC 61000-4-2, contact discharge
±8 kV IEC 61000-4-2, air discharge
Complies with TIA/EIA-422-B and ITU-T recommendation V.11
Open-circuit fail-safe
Suitable for 5 V power supply applications
Low supply current operation: 9 mA maximum
Low driver output skew
Receiver input impedance: 30 kΩ
Receiver common-mode range: −7 V to +7 V
Power-up/power-down without glitches
16-pin TSSOP package
Operating temperature range: −40°C to +85°C
APPLICATIONS
FUNCTIONAL BLOCK DIAGRAM
VCC
ADM4168E
DI1
Y1
B1
R1
D1
Z1
A1
RO1
DE1
DE2
RO2
Z2
A2
R2
D2
B2
Y2
DI2
GND
10820-001
Data Sheet
±15 kV ESD Protected
Dual RS-422 Transceiver
ADM4168E
Figure 1.
RS-422 interfaces
High data rate motor control
Single-ended-to-differential signal conversion
Point-to-point and multidrop transmission systems
GENERAL DESCRIPTION
The ADM4168E has dual RS-422 transceivers suitable for
high speed communication on point-to-point and multidrop
transmission lines. The ADM4168E is designed for balanced
transmission lines and complies with TIA/EIA-422-B.
The differential driver outputs and receiver inputs feature electrostatic discharge circuitry that provides protection up to ±15 kV
HBM and ±8 kV IEC 61000-4-2 (contact and air discharge).
The receivers of the ADM4168E contain a fail-safe feature that
results in a logic high output state if the inputs are unconnected
(floating).
The ADM4168E is fully specified over the commercial and
industrial temperature ranges and is available in a 16-pin
TSSOP package.
The ADM4168E operates from a single 5 V power supply.
Excessive power dissipation caused by bus contention or output
shorting is prevented by short-circuit protection circuitry. Shortcircuit protection circuits limit the maximum output current to
150 mA during fault conditions.
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.
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
©2012 Analog Devices, Inc. All rights reserved.
ADM4168E
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Pin Configuration and Function Descriptions..............................6
Applications ....................................................................................... 1
Typical Performance Characteristics ..............................................7
Functional Block Diagram .............................................................. 1
Test Circuits and Switching Characteristics...................................9
General Description ......................................................................... 1
Driver Measurements ...................................................................9
Revision History ............................................................................... 2
Receiver Measurements ................................................................9
Specifications..................................................................................... 3
Theory of Operation ...................................................................... 10
Timing Specifications .................................................................. 4
Truth Tables................................................................................. 10
Absolute Maximum Ratings ............................................................ 5
Outline Dimensions ....................................................................... 11
Thermal Resistance ...................................................................... 5
Ordering Guide .......................................................................... 11
ESD Caution .................................................................................. 5
REVISION HISTORY
9/12—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
Data Sheet
ADM4168E
SPECIFICATIONS
4.5 V ≤ VCC ≤ 5.5 V; all minimum/maximum specifications apply over the entire recommended operation range, unless otherwise noted.
All typical specifications are at TA = 25°C, VCC = 5.0 V, unless otherwise noted.
Table 1.
Parameter
SUPPLY CURRENT
Total Package
DRIVER
Differential Outputs (Y1, Z1, Y2, Z2 Pins)
Input Clamp Voltage
Output Voltage High
Output Voltage Low
Differential Output Voltage
No Load
Outputs Loaded 2
Δ|VOD| for Complementary Output States
Common-Mode Output Voltage
Δ|VOC| for Complementary Output States
Output Leakage Current
Output Current (Short Circuit) 3
Input Capacitance
Logic Inputs (DI, DE Pins)
Input Voltage High
Input Voltage Low
Input Current High
Input Current Low
RECEIVER
Differential Inputs (A1, B1, A2, B2 Pins)
Differential Input Threshold Voltage2
Input Voltage Hysteresis
Input Current
Line Input Resistance
Logic Outputs (RO1, RO2 Pins)
Output Voltage High
Output Voltage Low
Symbol
Min
ICC
VIK
VOH
VOL
|VOD1|
|VOD2|
∆|VOD|
VOC
Δ|VOC|
IO
IOS
CI
2.4
2.0
2.0
Typ
Max
Unit
4
5
6
9
mA
mA
Test Conditions/Comments
No load, drivers enabled
VI = VCC or GND
VI = 2.4 V or 0.5 V 1
−1.5
V
V
V
II = −18 mA
VIH = 2 V, VIL = 0.8 V, IOH = −20 mA
VIH = 2 V, VIL = 0.8 V, IOL = 20 mA
V
V
V
V
V
µA
µA
mA
pF
IO = 0 mA
RL = 100 Ω (see Figure 11)
RL = 100 Ω (see Figure 11)
RL = 100 Ω (see Figure 11)
RL = 100 Ω (see Figure 11)
DE = 0 V, VCC = 0 V or 5 V, VO = 6 V
DE = 0 V, VCC = 0 V or 5 V, VO = −0.25 V
VO = VCC or GND
3.5
0.2
0.4
6.0
3.7
±0.4
±3.0
±0.4
100
−100
−30
−150
6
VIH
VIL
IIH
IIL
2.0
VTH
VHYS
II
−200
RIN
12
30
VOH
VOL
3.8
4.2
0.1
0.8
1
−1
+200
60
1.5
−2.5
1
0.3
Measured per input with other inputs at VCC or GND.
For exact conditions, see TIA/EIA-422-B.
3
No more than one output shorted at any time, with the duration of the short not to exceed 1 second.
2
Rev. 0 | Page 3 of 12
V
V
µA
µA
VI = VCC or VIH
VI = GND or VIL
mV
mV
mA
mA
kΩ
VI = 7 V, other input at 0 V
VI = −7 V, other input at 0 V
VIC = −7 V to +7 V, other input at 0 V
V
V
VID = 200 mV, IOH = −6 mA
VID = −200 mV, IOL = 6 mA
ADM4168E
Data Sheet
TIMING SPECIFICATIONS
4.5 V ≤ VCC ≤ 5.5 V; all minimum/maximum specifications apply over the entire recommended operation range, unless otherwise noted.
All typical specifications are at TA = 25°C, VCC = 5.0 V, unless otherwise noted.
Table 2.
Parameter
DRIVER
Propagation Delay
Driver Output Skew
Rise Time/Fall Time
Enable Time
Disable Time
RECEIVER 1
Propagation Delay
Transition Time
1
Symbol
Min
tDPLH, tDPHL
tSK
tDR, tDF
tZH, tZL
tHZ, tLZ
tRPLH, tRPHL
tTLH, tTHL
9
Typ
Max
Unit
8
1.5
5
10
7
16
4
10
19
16
ns
ns
ns
ns
ns
Test Conditions/Comments
R1, R2 = 50 Ω; R3 = 500 Ω; C1, C2, C3 = 40 pF
S1 open (see Figure 12 and Figure 13)
S1 open (see Figure 12 and Figure 13)
S1 open (see Figure 12 and Figure 13)
S1 closed (see Figure 13 and Figure 14)
S1 closed (see Figure 13 and Figure 14)
15
4
27
9
ns
ns
CL = 50 pF (see Figure 15 and Figure 16)
VIC = 0 V, CL = 50 pF (see Figure 15 and Figure 16)
Measured per input with other inputs at VCC or GND.
Rev. 0 | Page 4 of 12
Data Sheet
ADM4168E
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 3.
Parameter
VCC
Digital Input Voltage (DE1, DE2)
Driver Input Voltage (DI1, DI2)
Receiver Output Voltage (RO1, RO2)
Driver Output Voltage (Y1, Z1, Y2, Z2)
Receiver Input Voltage (A1, B1, A2, B2)
Operating Temperature Range
Storage Temperature Range
ESD Protection on Ax, Bx, Yx, and Zx
Human Body Model (HBM)
IEC 61000-4-2, Contact Discharge
IEC 61000-4-2, Air Discharge
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Rating
−0.3 V to +7 V
−0.3 V to +7 V
−0.3 V to +7 V
−0.3 V to VCC + 0.3 V
−0.3 V to +7 V
−14 V to +14 V
−40°C to +85°C
−65°C to +150°C
Table 4. Thermal Resistance
Package Type
16-Lead TSSOP
ESD CAUTION
±15 kV
±8 kV
±8 kV
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.
Rev. 0 | Page 5 of 12
θJA
113
Unit
°C/W
ADM4168E
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
16 VCC
B1 1
A1 2
15
DI1
DE1 4
ADM4168E
13 Z1
RO2 5
TOP VIEW
(Not to Scale)
12 DE2
A2 6
11 Z2
B2 7
10 Y2
GND 8
9
DI2
10820-002
14 Y1
RO1 3
Figure 2. Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
1
2
3
4
Mnemonic
B1
A1
RO1
DE1
5
6
7
8
9
RO2
A2
B2
GND
DI2
10
11
12
Y2
Z2
DE2
13
14
15
Z1
Y1
DI1
16
VCC
Description
Inverting Receiver Input B, Transceiver 1.
Noninverting Receiver Input A, Transceiver 1.
Receiver Output, Transceiver 1.
Driver Output Enable, Transceiver 1. A logic high enables the differential driver outputs, Y1 and Z1; a logic low
places the differential driver outputs in a high impedance state.
Receiver Output, Transceiver 2.
Noninverting Receiver Input A, Transceiver 2.
Inverting Receiver Input B, Transceiver 2.
Ground.
Driver Input, Transceiver 2. When the driver is enabled, a logic low on DI2 forces Y2 low and Z2 high, whereas
a logic high on DI2 forces Y2 high and Z2 low.
Noninverting Driver Output Y, Transceiver 2.
Inverting Driver Output Z, Transceiver 2.
Driver Output Enable, Transceiver 2. A logic high enables the differential driver outputs, Y2 and Z2; a logic low
places the differential driver outputs in a high impedance state.
Inverting Driver Output Z, Transceiver 1.
Noninverting Driver Output Y, Transceiver 1.
Driver Input, Transceiver 1. When the driver is enabled, a logic low on DI1 forces Y1 low and Z1 high, whereas
a logic high on DI1 forces Y1 high and Z1 low.
Power Supply (5 V ± 10%).
Rev. 0 | Page 6 of 12
Data Sheet
ADM4168E
TYPICAL PERFORMANCE CHARACTERISTICS
120
100
100Ω LOAD
UNLOADED
SUPPLY CURRENT, ICC (mA)
100
SUPPLY CURRENT, ICC (mA)
100Ω LOAD
UNLOADED
90
80
60
40
80
70
60
50
40
30
20
20
40
60
80
TEMPERATURE (°C)
0
1
2
3.7
3.6
3.5
3.4
3.3
3.2
3.1
–20
0
20
40
60
80
TEMPERATURE (°C)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE, |VOD2| (V)
TRANSCEIVER 1
TRANSCEIVER 2
3.8
3.0
–40
RECEIVER OUTPUT VOLTAGE LOW, VOL (mV)
3
2
1
20
40
60
80
TEMPERATURE (°C)
9
10
5.4
5.5
TRANSCEIVER 1
TRANSCEIVER 2
4.1
3.9
3.7
3.5
3.3
3.1
2.9
2.7
2.5
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
TRANSCEIVER 1
TRANSCEIVER 2
450
400
350
300
250
200
150
100
50
0
–40
10820-014
RECEIVER OUTPUT VOLTAGE HIGH, VOH (V)
4
0
8
4.3
500
TRANSCEIVER 1
TRANSCEIVER 2
–20
7
Figure 7. Driver Differential Output Voltage vs. Supply Voltage
5
0
–40
6
SUPPLY VOLTAGE, VCC (V)
Figure 4. Driver Differential Output Voltage vs. Temperature
6
5
Figure 6. Supply Current vs. Data Rate
10820-008
DRIVER DIFFERENTIAL OUTPUT VOLTAGE, |VOD2| (V)
3.9
4
DATA RATE (Mbps)
Figure 3. Supply Current vs. Temperature, Data Rate = 10 Mbps
4.0
3
10820-009
20
–20
0
20
40
60
80
TEMPERATURE (°C)
Figure 8. Receiver Output Voltage Low vs. Temperature
Figure 5. Receiver Output Voltage High vs. Temperature
Rev. 0 | Page 7 of 12
10820-015
0
10820-003
–20
10820-004
10
0
–40
ADM4168E
Data Sheet
DI
A
1
B
2
RO
Y
Z
CH2 2V
M100ns
A CH1
2.48V
10820-007
CH1 2V
CH3 2V
CH2 2V
CH4 2V
Figure 9. Driver Output
CH3 2V
M100ns
Figure 10. Receiver Output
Rev. 0 | Page 8 of 12
A CH2
2.28V
10820-016
4
3
Data Sheet
ADM4168E
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
DRIVER MEASUREMENTS
Y
RL
2
DI
Y
DI
VOD2
RL
2
DE
VOC
R1
R3
VOD
C1
1.5V
S1
R2
Z
Z
C3
10820-019
Z
C2
10820-021
Y
NOTES
1. C1, C2, C3 INCLUDE PROBE/INSTRUMENT CAPACITANCE.
Figure 11. Driver Voltage Measurements
Figure 13. Driver Timing Circuit
5V
5V
DE
INPUT
1.3V
1.3V
1.3V
1.3V
0V
0V
tDPHL
tDPLH
tZL
tLZ
1.5V
VOH
VOL + 0.3V
VOL
VOL
tZH
tSK
tSK
VOH
VOH
OUT
Z
2V
VOH – 0.3V
50%
50%
1.3V
1.5V
1.3V
VOL
tDPHL
+VO
tHZ
NOTES
1. INPUT PULSE GENERATOR: PPR 1MHz; 50% DUTY CYCLE; tR, tF ≤ 6ns.
tDPLH
90% POINT
Figure 14. Driver Enable/Disable Timing
90% POINT
VOD
10% POINT
10% POINT
tDR
tDF
NOTES
1. INPUT PULSE GENERATOR: PPR 1MHz; 50% DUTY CYCLE; tR, tF ≤ 6ns.
10820-020
–VO
Figure 12. Driver Propagation Delay and Rise/Fall Timing
RECEIVER MEASUREMENTS
A
2.5V
0V
0V
tRPLH
tRPHL
VO
B
–2.5V
90%
50%
50%
10%
10%
tTLH
tTHL
NOTES
1. INPUT PULSE GENERATOR: PPR 1MHz; 50% DUTY CYCLE; tR, tF ≤ 6ns.
VOL
10820-024
RO
NOTES
1. CL INCLUDES PROBE/INSTRUMENT CAPACITANCE.
Figure 16. Receiver Timing Circuit
VOH
90%
CL
Figure 15. Receiver Propagation Delay and Transition Timing
Rev. 0 | Page 9 of 12
10820-023
B
(A = 0V)
10820-022
1.3V
0.8V
OUT
50%
1.3V
50%
Y
ADM4168E
Data Sheet
THEORY OF OPERATION
The ADM4168E is a dual RS-422 transceiver that operates from
a single 5 V ± 10% power supply. The ADM4168E is intended for
balanced data transmission and complies with TIA/EIA-422-B
and ITU-T recommendation V.11. Each device contains two
differential line drivers and two differential line receivers and
is suitable for full-duplex data transmission.
The receivers contain a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM4168E features a low propagation delay, ensuring
maximum baud rate operation. The balanced driver ensures
distortion-free transmission.
Another important specification is a measure of the skew
between the complementary outputs. Low skew enhances
the noise immunity of the system and decreases the amount
of electromagnetic interference (EMI).
Table 7. Transmitting (Each Driver)
DE
H
H
L
Z
L
H
Z
Table 8. Receiving (Each Receiver)
Inputs
A−B
≥ +0.2 V
≤ −0.2 V
−0.2 V < A − B < +0.2 V
Inputs open
TRUTH TABLES
Table 6. Abbreviations in Truth Tables
Letter
H
I
L
X
Z
Inputs
DI
H
L
X
Description
High level
Indeterminate
Low level
Irrelevant
High impedance (off )
Rev. 0 | Page 10 of 12
Output
RO
H
L
I
H
Outputs
Y
H
L
Z
Data Sheet
ADM4168E
OUTLINE DIMENSIONS
5.10
5.00
4.90
16
9
4.50
4.40
4.30
6.40
BSC
1
8
PIN 1
1.20
MAX
0.15
0.05
0.20
0.09
0.30
0.19
0.65
BSC
COPLANARITY
0.10
SEATING
PLANE
8°
0°
0.75
0.60
0.45
COMPLIANT TO JEDEC STANDARDS MO-153-AB
Figure 17. 16-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-16)
Dimensions shown in millimeters
ORDERING GUIDE
Model 1
ADM4168EBRUZ
ADM4168EBRUZ-RL7
EVAL-ADM4168EEBZ
1
Temperature Range
−40°C to +85°C
−40°C to +85°C
Package Description
16-Lead Thin Shrink Small Outline Package [TSSOP]
16-Lead Thin Shrink Small Outline Package [TSSOP]
Evaluation Board
Z = RoHS Compliant Part.
Rev. 0 | Page 11 of 12
Package Option
RU-16
RU-16
ADM4168E
Data Sheet
NOTES
©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D10820-0-9/12(0)
Rev. 0 | Page 12 of 12