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±15 kV ESD Protected

Dual RS-422 Transceiver

Data Sheet

ADM4168E

Rev. 0

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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

RS-422 interfaces

High data rate motor control

Single-ended-to-differential signal conversion

Point-to-point and multidrop transmission systems

FUNCTIONAL BLOCK DIAGRAM

RO1

DE1

DI1

GND

ADM4168E

RO2

DE2

DI2

10820-001

Figure 1.

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 electro-

static discharge circuitry that provides protection up to ±15 kV

HBM and ±8 kV IEC 61000-4-2 (contact and air discharge).

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. Short-

circuit protection circuits limit the maximum output current to

150 mA during fault conditions.

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.

Summary of content (12 pages)

PAGE 1
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.
PAGE 2
ADM4168E Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions..............................6 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................7 Functional Block Diagram ..............................................................
PAGE 3
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.
PAGE 4
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.
PAGE 5
Data Sheet ADM4168E ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 3.
PAGE 6
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.
PAGE 7
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.
PAGE 8
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.
PAGE 9
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.
PAGE 10
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.
PAGE 11
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.