ANALOG DEVICES ADM2682E, ADM2687E Service Manual

5 kV rms Signal and Power Isolated

V

V

RS-485 Transceiver with ±15 kV ESD

FEATURES

5 kV rms isolated RS-485/RS-422 transceiver, configurable as

half or full duplex

isoPower integrated isolated dc-to-dc converter
±15 kV ESD protection on RS-485 input/output pins
Complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E)
Data rate: 16 Mbps (ADM2682E), 500 kbps (ADM2687E)
5 V or 3.3 V operation
Connect up to 256 nodes on one bus
Open- and short-circuit, fail-safe receiver inputs
High common-mode transient immunity: >25 kV/μs
Thermal shutdown protection
Safety and regulatory approvals

UL recognition (pending)

5000 V rms for 1 minute per UL 1577

CSA Component Acceptance Notice #5A (pending)

IEC 60601-1: 400 V rms (basic), 250 V rms (reinforced)
IEC 60950-1: 600 V rms (basic), 380 V rms (reinforced)

VDE Certificates of Conformity (pending)

DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
V

= 846 V peak

IORM

Operating temperature range: −40°C to +85°C
16-lead wide-body SOIC with >8 mm creepage and clearance

APPLICATIONS

Isolated RS-485/RS-422 interfaces
Industrial field networks
Multipoint data transmission systems

CC

DIGITAL ISOLATION iCou pler

TxD

DE

RxD

RE

ADM2682E/ADM2687E

FUNCTIONAL BLOCK DIAGRAM

ISOOUT

isoPower DC-TO-DC CONVERTER

OSCILLATOR

ENCODE

ENCODE

DECODE

GND

1

ISOLATION

BARRIER

Figure 1.

RECTIFIER

REGULATOR

TRANSCEIVER

DECODE D

DECODE

ENCODE

ADM2682E/ADM2687E

GND

V

ISOIN

Y

Z

R

2

A

B

09927-001

GENERAL DESCRIPTION

The ADM2682E/ADM2687E are fully integrated 5 kV rms
signal and power isolated data transceivers with ±15 kV ESD
protection and are suitable for high speed communication on
multipoint transmission lines. The ADM2682E/ADM2687E
include an integrated 5 kV rms isolated dc-to-dc power supply
that eliminates the need for an external dc-to-dc isolation block.

They are designed for balanced transmission lines and comply
with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E).

The devices integrate Analog Devices, Inc., iCoupler® technology to
combine a 3-channel isolator, a three-state differential line driver, a
differential input receiver, and Analog Devices isoPower® dc-to-dc
converter into a single package. The devices are powered by a
single 5 V or 3.3 V supply, realizing a fully integrated signal and
power isolated RS-485 solution.

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.

The ADM2682E/ADM2687E drivers have an active high enable.
An active low receiver enable is also provided, which causes the
receiver output to enter a high impedance state when disabled.

The devices have current limiting and thermal shutdown
features to protect against output short circuits and situations
where bus contention may cause excessive power dissipation.
The parts are fully specified over the industrial temperature
range and are available in a highly integrated, 16-lead, wide­body SOIC package with >8 mm creepage and clearance.

The ADM2682E/ADM2687E contain isoPower technology that
uses high frequency switching elements to transfer power through
the transformer. Special care must be taken during printed circuit
board (PCB) layout to meet emissions standards. Refer to

AN-0971 Application Note, Recommendations for Control of

Radiated Emissions with isoPower Devices, for details on board
layout considerations.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2011 Analog Devices, Inc. All rights reserved.

ADM2682E/ADM2687E

TABLE OF CONTENTS

Features.............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

ADM2682E Timing Specifications ............................................ 4

ADM2687E Timing Specifications ............................................ 4

Package Characteristics ............................................................... 4

Regulatory Information............................................................... 5

Insulation and Safety-Related Specifications............................ 5

VDE 0884 Insulation Characteristics (Pending)...................... 6

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ............................................. 9

Test Circuits..................................................................................... 14

Switching Characteristics .............................................................. 15

Circuit Description......................................................................... 16

Signal Isolation ........................................................................... 16

Power Isolation ........................................................................... 16

Truth Tables................................................................................. 16

Thermal Shutdown .................................................................... 16

Open- and Short-Circuit, Fail-Safe Receiver Inputs.............. 16

DC Correctness and Magnetic Field Immunity........................... 16

Applications Information.............................................................. 18

PCB Layout ................................................................................. 18

EMI Considerations................................................................... 18

Insulation Lifetime..................................................................... 19

Isolated Supply Considerations................................................ 19

Typical Applications................................................................... 20

Outline Dimensions....................................................................... 22

Ordering Guide .......................................................................... 22

REVISION HISTORY

7/11—Revision 0: Initial Version

Rev. 0 | Page 2 of 24

ADM2682E/ADM2687E

SPECIFICATIONS

All voltages are relative to their respective ground; 3.0 ≤ VCC ≤ 5.5 V. All minimum/maximum specifications apply over the entire
recommended operation range, unless otherwise noted. All typical specifications are at T

Table 1.

Parameter Symbol Min Typ Max Unit Test Conditions/Comments

ADM2687E SUPPLY CURRENT ICC

Data Rate ≤ 500 kbps 90 mA VCC = 3.3 V, 100 Ω load between Y and Z
72 mA VCC = 5 V, 100 Ω load between Y and Z
125 mA VCC = 3.3 V, 54 Ω load between Y and Z
98 mA VCC = 5 V, 54 Ω load between Y and Z

140 mA 120 Ω load between Y and Z

ADM2682E SUPPLY CURRENT ICC

Data Rate = 16 Mbps 175 mA 120 Ω load between Y and Z
260 mA 54 Ω load between Y and Z

Data Rate = 16 Mbps, 4.5 ≤ VCC ≤ 5.5 V 130 mA 120 Ω load between Y and Z
200 mA 54 Ω load between Y and Z
ISOLATED SUPPLY VOLTAGE V

3.3 V

ISOOUT

DRIVER

Differential Outputs

Differential Output Voltage, Loaded |V

| 2.0 3.6 V RL = 100 Ω (RS-422), see Figure 29

OD2

1.5 3.6 V RL = 54 Ω (RS-485), see Figure 29
|V

| 1.5 3.6 V −7 V ≤ V

OD3

Δ|VOD| for Complementary Output States Δ|VOD| 0.2 V RL = 54 Ω or 100 Ω, see Figure 29
Common-Mode Output Voltage VOC 3.0 V RL = 54 Ω or 100 Ω, see Figure 29
Δ|VOC| for Complementary Output States Δ|VOC| 0.2 V RL = 54 Ω or 100 Ω, see Figure 29
Short-Circuit Output Current IOS 200 mA

Output Leakage Current (Y, Z) IO 30 μA

−30 μA

Logic Inputs DE, RE, TxD

Input Threshold Low VIL 0.27 VCC V
Input Threshold High VIH 0.7 VCC V
Input Current II −10 0.01 10 μA

RECEIVER

Differential Inputs

Differential Input Threshold Voltage VTH −200 −125 −30 mV −7 V < VCM < +12 V
Input Voltage Hysteresis V

15 mV VOC = 0 V

HYS

Input Current (A, B) II 125 μA DE = 0 V, VCC = 0 V or 3.6 V, VIN = 12 V

−100 μA DE = 0 V, VCC = 0 V or 3.6 V, VIN = −7 V
Line Input Resistance RIN 96 kΩ −7 V < VCM < +12 V

Logic Outputs

Output Voltage Low VOL 0.2 0.4 V IO = 1.5 mA, VA − VB = −0.2 V
Output Voltage High VOH V

− 0.3 VCC − 0.2 V IO = −1.5 mA, VA − VB = 0.2 V

CC

Short-Circuit Current 100 mA

COMMON-MODE TRANSIENT IMMUNITY1 25 kV/μs VCM = 1 kV, transient magnitude = 800 V

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.

= 25°C, VCC = 5 V unless otherwise noted.

A

≤ 12 V, see Figure 30

TEST1

DE = 0 V, RE

= 0 V, VCC = 0 V or 3.6 V,

VIN = 12 V
DE = 0 V, RE

= 0 V, VCC = 0 V or 3.6 V,

VIN = −7 V

, TxD

DE, RE

, TxD

DE, RE

, TxD

DE, RE

Rev. 0 | Page 3 of 24

ADM2682E/ADM2687E

ADM2682E TIMING SPECIFICATIONS

TA = −40°C to +85°C.

Table 2.

Parameter Symbol Min Typ Max Unit Test Conditions/Comments

DRIVER

Maximum Data Rate 16 Mbps
Propagation Delay, Low to High t
Propagation Delay, High to Low t
Output Skew t
Rise Time/Fall Time tDR, tDF 15 ns RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 31 and Figure 35
Enable Time tZL, tZH 120 ns RL = 110 Ω, CL = 50 pF, see Figure 32 and Figure 37
Disable Time tLZ, tHZ 150 ns RL = 110 Ω, CL = 50 pF, see Figure 32 and Figure 37

RECEIVER

Propagation Delay, Low to High t
Propagation Delay, High to Low t
Output Skew1 t
Enable Time tZL, tZH 15 ns RL = 1 kΩ, CL = 15 pF, see Figure 34 and Figure 38
Disable Time tLZ, tHZ 15 ns RL = 1 kΩ, CL = 15 pF, see Figure 34 and Figure 38

1

Guaranteed by design.

ADM2687E TIMING SPECIFICATIONS

TA = −40°C to +85°C.

Table 3.

Parameter Symbol Min Typ Max Unit Test Conditions/Comments

DRIVER

Maximum Data Rate 500 kbps
Propagation Delay, Low to High t
Propagation Delay, High to Low t
Output Skew t
Rise Time/Fall Time tDR, tDF 200 1100 ns RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 31 and Figure 35
Enable Time tZL, tZH 2.5 μs RL = 110 Ω, CL = 50 pF, see Figure 32 and Figure 37
Disable Time tLZ, tHZ 200 ns RL = 110 Ω, CL = 50 pF, see Figure 32 and Figure 37

RECEIVER

Propagation Delay, Low to High t
Propagation Delay, High to Low t
Output Skew t
Enable Time tZL, tZH 15 ns RL = 1 kΩ, CL = 15 pF, see Figure 34 and Figure 38
Disable Time tLZ, tHZ 15 ns RL = 1 kΩ, CL = 15 pF, see Figure 34 and Figure 38

63 100 ns RL = 54 Ω, CL1 = C

DPLH

64 100 ns RL = 54 Ω, CL1 = C

DPHL

1 8 ns RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 31 and Figure 35

SKEW

94 110 ns CL = 15 pF, see Figure 33 and Figure 36

RPLH

95 110 ns CL = 15 pF, see Figure 33 and Figure 36

RPHL

1 12 ns CL = 15 pF, see Figure 33 and Figure 36

SKEW

250 503 700 ns RL = 54 Ω, CL1 = C

DPLH

250 510 700 ns RL = 54 Ω, CL1 = C

DPHL

7 100 ns RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 31 and Figure 35

SKEW

91 200 ns CL = 15 pF, see Figure 33 and Figure 36

RPLH

95 200 ns CL = 15 pF, see Figure 33 and Figure 36

RPHL

4 30 ns CL = 15 pF, see Figure 33 and Figure 36

SKEW

= 100 pF, see Figure 31 and Figure 35

L2

= 100 pF, see Figure 31 and Figure 35

L2

= 100 pF, see Figure 31 and Figure 35

L2

= 100 pF, see Figure 31 and Figure 35

L2

PACKAGE CHARACTERISTICS

Table 4.

Parameter Symbol Min Typ Max Unit Test Conditions/Comments

Resistance (Input-to-Output)1 R
Capacitance (Input-to-Output)1 C
Input Capacitance2 C

1

Device considered a 2-terminal device: short together Pin 1 to Pin 8 and short together Pin 9 to Pin 16.

2

Input capacitance is from any input data pin to ground.

10

I-O

3 pF f = 1 MHz

I-O

4 pF

I

Rev. 0 | Page 4 of 24

12

Ω

ADM2682E/ADM2687E

REGULATORY INFORMATION

Table 5. ADM2682E/ADM2687E Approvals (Pending)

Organization Approval Type
UL (Pending)

CSA (Pending)

VDE (Pending)

INSULATION AND SAFETY-RELATED SPECIFICATIONS

Table 6.

Parameter Symbol Value Unit Test Conditions/Comments

Rated Dielectric Insulation Voltage 5000 V rms 1-minute duration
Minimum External Air Gap (Clearance) L(I01) >8.0 mm

Minimum External Tracking (Creepage) L(I02) >8.0 mm

Minimum Internal Gap (Internal Clearance) 0.017 min mm Insulation distance through insulation
Tracking Resistance (Comparative Tracking Index) CTI >175 V DIN IEC 112/VDE 0303-1
Isolation Group IIIa Material Group (DIN VDE 0110:1989-01, Table 1)

To be recognized under the UL 1577 Component Recognition Program of Underwriters Laboratories, Inc.
Single protection, 5000 V rms isolation voltage.
In accordance with UL 1577, each ADM2682E/ADM2687E is proof tested by applying an insulation test voltage

≥ 6000 V rms for 1 second.
To be approved under CSA Component Acceptance Notice #5A.
Reinforced insulation per IEC 60601-1, 250 V rms (353 V peak) maximum working voltage.
Basic insulation per IEC 60601-1, 400 V rms (566 V peak) maximum working voltage.
Reinforced insulation per CSA 60950-1-07 and IEC 60950-1, 380 V rms (537 V peak) maximum working voltage.
Basic insulation per CSA 60950-1-07 and IEC 60950-1, 600 V rms (848 V peak) maximum working voltage.
To be certified according to DIN EN 60747-5-2 (VDE 0884 Part 2):2003-01.
In accordance with DIN EN 60747-5-2, each ADM2682E/ADM2687E is proof tested by applying an insulation test voltage

≥1590 V peak for 1 second.

Measured from input terminals to output terminals,
shortest distance through air

Measured from input terminals to output terminals,
shortest distance along body

Rev. 0 | Page 5 of 24

ADM2682E/ADM2687E

VDE 0884 INSULATION CHARACTERISTICS (PENDING)

This isolator is suitable for basic electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured by
means of protective circuits.

Table 7.

Description Test Conditions/Comments Symbol Characteristic Unit

CLASSIFICATIONS

Installation Classification per DIN VDE 0110 for

Rated Mains Voltage
≤300 V rms I to IV
≤450 V rms I to III
≤600 V rms I to II

Climatic Classification 40/85/21
Pollution Degree Table 1 of DIN VDE 0110 2

VOLTAGE

Maximum Working Insulation Voltage V
Input-to-Output Test Voltage VPR

Method b1

Method a

After Environmental Tests, Subgroup 1 V

After Input and/or Safety Test,

Subgroup 2/Subgroup 3

Highest Allowable Overvoltage Transient overvoltage, tTR = 10 sec VTR 6000 V peak

SAFETY-LIMITING VALUES Maximum value allowed in the event of a failure

Case Temperature TS 150 °C
Input Current I
Output Current I
Insulation Resistance at TS V

846 V peak

IORM

× 1.875 = VPR, 100% production tested,

V

IORM

= 1 sec, partial discharge < 5 pC

t

m

× 1.6 = VPR, tm = 60 sec, partial discharge < 5 pC 1375 V peak

IORM

× 1.2 = VPR, tm = 60 sec, partial discharge < 5 pC 1018 V peak

V

IORM

= 500 V RS >109 Ω

IO

1590 V peak

265 mA

S, INPUT

335 mA

S, OUTPUT

Rev. 0 | Page 6 of 24

ADM2682E/ADM2687E

ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted. All voltages are relative to
their respective ground.

Table 8.

Parameter Rating
VCC −0.5 V to +7 V
Digital Input Voltage (DE, RE, TxD)
Digital Output Voltage (RxD) −0.5 V to VDD + 0.5 V
Driver Output/Receiver Input Voltage −9 V to +14 V
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −55°C to +150°C
ESD (Human Body Model) on

A, B, Y, and Z pins
ESD (Human Body Model) on Other Pins
Thermal Resistance θJA
Lead Temperature

Soldering (10 sec) 260°C

Vapor Phase (60 sec) 215°C

Infrared (15 sec) 220°C

−0.5 V to V

±15 kV

±2 kV
52°C/W

+ 0.5 V

DD

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.

Table 9. Maximum Continuous Working Voltage

Parameter Max Unit Reference Standard

AC Voltage

Bipolar Waveform 424 V peak

Unipolar Waveform

Basic Insulation 600 V peak
Reinforced Insulation 537 V peak

DC Voltage

Basic Insulation 600 V peak
Reinforced Insulation 537 V peak

1

Refers to continuous voltage magnitude imposed across the isolation

barrier. See the Insulation Lifetime section for more details.

ESD CAUTION

1

All certifications,
50-year minimum
lifetime

Maximum approved
working voltage per
IEC 60950-1

Maximum approved
working voltage per
IEC 60950-1

Rev. 0 | Page 7 of 24

ADM2682E/ADM2687E

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

GND

1

V

2

CC

3

RxD

TxD

V

GND

NOTES

1. PIN 10 AND PIN 15 M UST BE
CONNECTED EXT ERNALLY.

RE

DE

CC

1

ADM2682E/

4

ADM2687E

5

TOP VIEW

(Not to Scale)

6

7

8

16

GND

2

V

15

ISOIN

14

A

B

13

12

Z

Y

11

10

V

ISOOUT

GND

9

2

09927-002

Figure 2. Pin Configuration

Table 10. Pin Function Descriptions

Pin No. Mnemonic Description

1 GND1 Ground, Logic Side.
2 V

CC

Logic Side Power Supply. It is recommended that a 0.1 μF and a 0.01 μF decoupling capacitor be fitted between
Pin 2 and Pin 1.

3 RxD

4

Receiver Enable Input. This is an active-low input. Driving this input low enables the receiver, while driving it high

RE

Receiver Output Data. This output is high when (A − B) ≥ −30 mV and low when (A − B) ≤ –200 mV. The output is
tristated when the receiver is disabled, that is, when RE

is driven high.

disables the receiver.
5 DE Driver Enable Input. Driving this input high enables the driver, while driving it low disables the driver.
6 TxD Driver Input. Data to be transmitted by the driver is applied to this input.
7 V

CC

Logic Side Power Supply. It is recommended that a 0.1 μF and a 10 μF decoupling capacitor be fitted between

Pin 7 and Pin 8.
8 GND1 Ground, Logic Side.
9 GND2 Ground, Bus Side.
10 V

ISOOUT

Isolated Power Supply Output. This pin must be connected externally to V

. It is recommended that a reservoir

ISOIN

capacitor of 10 μF and a decoupling capacitor of 0.1 μF be fitted between Pin 10 and Pin 9.
11 Y Driver Noninverting Output
12 Z Driver Inverting Output
13 B Receiver Inverting Input.
14 A Receiver Noninverting Input.
15 V

ISOIN

Isolated Power Supply Input. This pin must be connected externally to V

. It is recommended that a 0.1 μF

ISOOUT

and a 0.01 μF decoupling capacitor be fitted between Pin 15 and Pin 16.
16 GND2 Ground, Bus Side.

Rev. 0 | Page 8 of 24

ADM2682E/ADM2687E

TYPICAL PERFORMANCE CHARACTERISTICS

200

180

160

140

(mA)

CC

120

100

80

60

SUPPLY CURRENT, I

40

20

0

–40 –15 10 35 60 85

Figure 3. ADM2682E Supply Current (I

(Data Rate = 16 Mbps, DE = 3.3 V, V

160

R

= 54

L

= 120

R

L

NO LOAD

TEMPERAT URE (°C)

) vs. Temperature

CC

= 3.3 V)

CC

09927-203

140

120

= 54

R

100

(mA)

CC

80

60

40

SUPPLY CURRENT, I

20

0

1 4 7 10 13 16

Figure 6. ADM2682E Supply Current (I

(T

= 25°C, DE = 5 V, VCC = 5 V)

A

120

L

= 120

R

L

NO LOAD

DATA RATE (M bps)

) vs. Data Rate

CC

09927-206

140

R

= 54

120

(mA)

CC

100

80

60

40

SUPPLY CURRENT, I

20

0

–40 –15 10 35 60 85

Figure 4. ADM2682E Supply Current (I

(Data Rate = 16 Mbps, DE = 5 V, V

180

160

140

(mA)

120

CC

100

80

60

SUPPLY CURRENT, I

40

20

0

1 4 7 10 13 16

Figure 5. ADM2682E Supply Current (I

= 25°C, DE = 3.3 V, VCC = 3.3 V)

(T

A

L

R

= 120

L

NO LOAD

TEMPERAT URE (°C)

R

= 54

L

= 120

R

L

NO LOAD

DATA RATE (M bps)

) vs. Temperature

CC

= 5 V)

CC

) vs. Data Rate

CC

100

(mA)

80

CC

60

40

SUPPLY CURRENT, I

20

0
–40 –15 10 35 60 85

09927-204

Figure 7. ADM2687E Supply Current (I

(Data Rate = 500 kbps, DE = 5 V, V

160

140

120

(mA)

CC

100

80

60

40

SUPPLY CURRENT, I

20

0

09927-205

–40 –15 10 35 60 85

Figure 8. ADM2687E Supply Current (I

(Data Rate = 500 kbps, DE = 3.3 V, V

= 54

R

L

R

= 120

L

NO LOAD

TEMPERATURE (°C)

= 54

R

L

= 120

R

L

NO LOAD

TEMPERATURE (°C)

) vs. Temperature

CC

= 5 V)

CC

) vs. Temperature

CC

= 3.3 V)

CC

09927-207

09927-208

Rev. 0 | Page 9 of 24

ADM2682E/ADM2687E

140

R

= 54

120

100

(mA)

CC

80

60

40

SUPPLY CURRENT, I

20

0

50 200125 275 350 425 500

Figure 9. ADM2687E Supply Current (I

(T

= 25°C, DE = 3.3 V, VCC = 3.3 V)

A

120

100

(mA)

80

CC

60

L

R

= 120

L

NO LOAD

DATA RATE (kbps)

= 54

R

L

R

= 120

L

) vs. Data Rate

CC

09927-209

600

580

560

540

520

500

480

460

440

DRIVER PRO PAGATI ON DELAY (ns)

420

400

–40 –15 10 35 60 85

t

DPLH

t

DPHL

TEMPERATURE (°C)

09927-108

Figure 12. ADM2687E Differential Driver Propagation Delay vs. Temperature

TxD

1

40

SUPPLY CURRENT, I

20

0

50 200125 275 350 425 500

Figure 10. ADM2687E Supply Current (I

(T

A

72

70

68

66

64

62

60

58

56

54

DRIVER PROPAGATI ON DELAY (ns)

52

50

–40 –15 10 35 60 85

t

DPHL

NO LOAD

DATA RATE (kbps)

CC

= 25°C, DE = 5 V, VCC = 5 V)

t

DPLH

TEMPERATURE (°C)

) vs. Data Rate

09927-210

09927-107

Figure 11. ADM2682E Differential Driver Propagation Delay vs. Temperature

Z

Y

3

CH1 2.0V

CH3 2.0V

CH2 2.0V

M10.00ns A CH1 1.28V

Figure 13. ADM2682E Driver Propagation Delay

1

3

CH1 2.0V

CH3 2.0V

TxD

Z

Y

CH2 2.0V M200ns A CH1 2.56V

Figure 14. ADM2687E Driver Propagation Delay

09927-109

09927-110

Rev. 0 | Page 10 of 24

ADM2682E/ADM2687E

0

0.32

–10

–20

–30

–40

–50

OUTPUT CURRENT (mA)

–60

–70

012345

OUTPUT HI GH VOLTAGE (V)

Figure 15. Receiver Output Current vs. Receiver Output High Voltage

60

50

40

30

20

OUTPUT CURRE NT (mA)

10

0.30

0.28

0.26

0.24

OUTPUT LOW VOLTAGE (V)

0.22

0.20

–40 –15 10 35 60 85

09927-111

TEMPERATURE (°C)

09927-114

Figure 18. Receiver Output Low Voltage vs. Temperature

B

1

3

A

RxD

0

012345

OUTPUT LOW VOLTAGE (V)

Figure 16. Receiver Output Current vs. Receiver Output Low Voltage

4.75

4.74

4.73

4.72

4.71

4.70

4.69

4.68

OUTPUT HIG H VOLTAG E (V)

4.67

4.66

4.65

–40 –15 10 35 60 85

TEMPERATURE (°C)

Figure 17. Receiver Output High Voltage vs. Temperature

CH1 2.0V

09927-112

CH3 2.0V

CH2 2.0V M10. 00ns A CH1 2. 56V

09927-115

Figure 19. ADM2682E Receiver Propagation Delay

A

1

3

CH1 2.0V

09927-113

CH3 2.0V

CH2 2.0V M10. 00ns A CH1 2. 56V

B

RxD

09927-116

Figure 20. ADM2687E Receiver Propagation Delay

Rev. 0 | Page 11 of 24

ADM2682E/ADM2687E

G
A

A

98

97

Y (ns)

96

t

TION DEL

95

94

93

RECEIVER PRO PA

92

–40 –15 10 35 60 85

TEMPERATURE (°C)

RPHL

t

RPLH

Figure 21. ADM2682E Receiver Propagation Delay vs. Temperature

100

99

98

97

96

95

94

93

92

RECEIVER PROPAGATI ON DELAY (ns)

91

90

–40 –15 10 35 60 85

t

RPHL

t

RPLH

TEMPERATURE (°C)

Figure 22. ADM2687E Receiver Propagation Delay vs. Temperature

3.39

3.44

3.43

3.42

3.41

3.40

3.39

3.38

3.37

3.36

ISOLATED SUPPLY VOLTAGE (V)

3.35

3.34

09927-117

–40 10–15 35 60 85

RL = 120

NO LOAD

= 54

R

L

TEMPERATURE (°C)

09927-224

Figure 24. ADM2682E Isolated Supply Voltage vs. Temperature

= 5 V, Data Rate = 16 Mbps)

(V

CC

3.37

3.36

3.35

3.34

3.33

3.32

ISOLATED SUPPLY VOLTAGE (V)

3.31

3.30
–40 10–15 35 60 85

09927-118

RL = 120

NO LOAD

= 54

R

L

TEMPERATURE (°C)

09927-225

Figure 25. ADM2687E Isolated Supply Voltage vs. Temperature

(V

= 3.3 V, Data Rate = 500 kbps)

CC

3.39

3.38

NO LOAD

ISOLATED SUPPLY VOLT AGE (V)

3.37

3.36

3.35

3.34

3.33

RL = 120

= 54

R

L

–40 10–15 35 60 85

TEMPERATURE (°C)

Figure 23. ADM2682E Isolated Supply Voltage vs. Temperature

= 3.3 V, Data Rate = 16 Mbps)

(V

CC

09927-223

3.38

3.37

3.36

3.35

3.34

3.33

ISOLATED SUPPLY VOLTAGE (V)

3.32

3.31
–40 10–15 35 60 85

RL = 120

NO LOAD

R

= 54

L

TEMPERATURE (°C)

Figure 26. ADM2687E Isolated Supply Voltage vs. Temperature

= 5 V, Data Rate = 500 kbps

(V

CC

09927-226

Rev. 0 | Page 12 of 24

ADM2682E/ADM2687E

60

R

= 54

50

40

30

L

R

L

= 120

40

35

30

25

20

R

L

R

= 120

L

= 54

20

10

ISOLATED SUPPLY CURRENT (mA)

0

–40 –15 10 35 60 85

NO LOAD

TEMPERATURE (°C)

Figure 27. ADM2682E Isolated Supply Current vs. Temperature

(V

= 3.3 V, Data Rate = 16 Mbps)

CC

15

10

ISOLATED SUPPLY CURRENT (mA)

5

0
–40 –15 10 35 60 85

09927-227

NO LOAD

TEMPERATURE (°C)

09927-228

Figure 28. ADM2687E Isolated Supply Current vs. Temperature

(VCC = 3.3 V, Data Rate = 500 kbps)

Rev. 0 | Page 13 of 24

ADM2682E/ADM2687E

T

T

T

T

V

V

A

V

–

TEST CIRCUITS

Y

xD V

Z

OD2

Figure 29. Driver Voltage Measurement

R

L

2

R

L

2

V

OC

09927-003

xD

DE

Y

S1 S2

Z

OUT

C
50pF

L

R

110

CC

L

09927-006

Figure 32. Driver Enable/Disable

Y

xD

V

OD3

Z

375

60

375

Figure 30. Driver Voltage Measurement over Common Mode

Y

xD

Z

C

R

L

C

Figure 31. Driver Propagation Delay

V

TEST

RxD

RE

B

09927-004

V

OUT

C

L

09927-007

Figure 33. Receiver Propagation Delay

L

L

09927-005

+1.5V

1.5V

RE IN

S1

RE

RxD

C

V

L

R

OUT

CC

L

S2

09927-008

Figure 34. Receiver Enable/Disable

Rev. 0 | Page 14 of 24

ADM2682E/ADM2687E

V

A

Y

Y

V

V

SWITCHING CHARACTERISTICS

CC

VCC/2 VCC/2

0V

Z

V

O

Y

1/2V

t

DPLH

O

t

DPHL

DE

0.5V

t

ZL

CC

t

0.5V

LZ

CC

0V

CC

2.3V

+V

V

–V

t

RxD

O

DIFF

O

SKEW

– B

= t

DPHL–tDPLH

90% POINT

10% POINT



V

= V

– V

DIFF

(Y)

(Z)

t

DR

Figure 35. Driver Propagation Delay, Rise/Fall Timing

0V

t

RPHL

– t

|

RPHL

t

RPLH

0V

1.5V

t

= |t

SKEW

RPLH

Figure 36. Receiver Propagation Delay

90% POINT

10% POINT

t

DF

1.5V

09927-009

V

OH

V

OL

09927-010

RE

RxD

RxD

0V

, Z

t

2.3V

ZH

, Z

t

HZ

V

+ 0.5V

OL

VOH– 0.5V

V

OL

V

OH

09927-011

Figure 37. Driver Enable/Disable Timing

IH

0.5V

t

ZL

t

ZH

CC

1.5V

OUTPUT LOW

OUTPUT HIGH

1.5V

t

t

0.5V

LZ

HZ

CC

+ 0.5V

V

OL

VOH– 0.5V

V

IL

V

OL

V

OH

09927-012

Figure 38. Receiver Enable/Disable Timing

Rev. 0 | Page 15 of 24

ADM2682E/ADM2687E

CIRCUIT DESCRIPTION

SIGNAL ISOLATION

The ADM2682E/ADM2687E signal isolation of 5 kV rms is
implemented on the logic side of the interface. The part achieves
signal isolation by having a digital isolation section and a trans­ceiver section (see Figure 1). Data applied to the TxD and DE
pins and referenced to logic ground (GND

) are coupled across

1

an isolation barrier to appear at the transceiver section referenced
to isolated ground (GND

). Similarly, the single-ended receiver

2

output signal, referenced to isolated ground in the transceiver
section, is coupled across the isolation barrier to appear at the
RxD pin referenced to logic ground.

POWER ISOLATION

The ADM2682E/ADM2687E power isolation of 5 kV rms is
implemented using an isoPower integrated isolated dc-to-dc
converter. The dc-to-dc converter section of the ADM2682E/

ADM2687E works on principles that are common to most

modern power supplies. It is a secondary side controller
architecture with isolated pulse-width modulation (PWM)
feedback. V

power is supplied to an oscillating circuit that

CC

switches current into a chip-scale air core transformer. Power
transferred to the secondary side is rectified and regulated to

3.3 V. The secondary (V

) side controller regulates the output

ISO

by creating a PWM control signal that is sent to the primary
(V

) side by a dedicated iCoupler (5 kV rms signal isolated)

CC

data channel. The PWM modulates the oscillator circuit to
control the power being sent to the secondary side. Feedback
allows for significantly higher power and efficiency.

TRUTH TABLES

The truth tables in this section use the abbreviations found in
Tabl e 11 .

Table 11. Truth Table Abbreviations

Letter Description

H High level
L Low level
X Don’t care
I Indeterminate
Z High impedance (off)
NC Disconnected

Table 12. Transmitting (see Table 11 for Abbreviations)

Inputs Outputs

DE TxD Y Z

H H H L
H L L H
L X Z Z
X X Z Z

Table 13. Receiving (see Table 11 for Abbreviations)

Inputs Output

A − B

≥ −0.03 V L or NC H
≤ −0.2 V L or NC L

−0.2 V < A − B < −0.03 V L or NC I
Inputs open L or NC H
X H Z

RE

RxD

THERMAL SHUTDOWN

The ADM2682E/ADM2687E contain thermal shutdown circuitry
that protects the parts from excessive power dissipation during
fault conditions. Shorting the driver outputs to a low impedance
source can result in high driver currents. The thermal sensing
circuitry detects the increase in die temperature under this
condition and disables the driver outputs. This circuitry is
designed to disable the driver outputs when a die temperature
of 150°C is reached. As the device cools, the drivers are reenabled
at a temperature of 140°C.

OPEN- AND SHORT-CIRCUIT, FAIL-SAFE RECEIVER INPUTS

The receiver inputs have open- and short-circuit, fail-safe features
that ensure that the receiver output is high when the inputs are
open or shorted. During line-idle conditions, when no driver on
the bus is enabled, the voltage across a terminating resistance at
the receiver input decays to 0 V. With traditional transceivers,
receiver input thresholds specified between −200 mV and
+200 mV mean that external bias resistors are required on the
A and B pins to ensure that the receiver outputs are in a known
state. The short-circuit, fail-safe receiver input feature eliminates
the need for bias resistors by specifying the receiver input
threshold between −30 mV and −200 mV. The guaranteed negative
threshold means that when the voltage between A and B decays
to 0 V, the receiver output is guaranteed to be high.

DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY

The digital signals transmit across the isolation barrier using
iCoupler technology. This technique uses chip-scale transformer
windings to couple the digital signals magnetically from one
side of the barrier to the other. Digital inputs are encoded into
waveforms that are capable of exciting the primary transformer
winding. At the secondary winding, the induced waveforms are
decoded into the binary value that was originally transmitted.

Positive and negative logic transitions at the isolator input cause
narrow (~1 ns) pulses to be sent to the decoder via the transformer.
The decoder is bistable and is, therefore, either set or reset by
the pulses, indicating input logic transitions. In the absence of
logic transitions at the input for more than 1 μs, periodic sets of
refresh pulses indicative of the correct input state are sent to
ensure dc correctness at the output. If the decoder receives no
internal pulses of more than approximately 5 μs, the input side

Rev. 0 | Page 16 of 24

ADM2682E/ADM2687E

is assumed to be unpowered or nonfunctional, in which case,
the isolator output is forced to a default state by the watchdog
timer circuit.

This situation should occur in the ADM2682E/ADM2687E devices
only during power-up and power-down operations. The limitation
on the ADM2682E/ADM2687E magnetic field immunity is set
by the condition in which induced voltage in the transformer
receiving coil is sufficiently large to either falsely set or reset the
decoder. The following analysis defines the conditions under
which this can occur.

The 3.3 V operating condition of the ADM2682E/ADM2687E
is examined because it represents the most susceptible mode of
operation. The pulses at the transformer output have an amplitude
of >1.0 V. The decoder has a sensing threshold of about 0.5 V,
thus establishing a 0.5 V margin in which induced voltages can
be tolerated. The voltage induced across the receiving coil is
given by

V = (−dβ/dt)Σπr

2

; n = 1, 2, … , N

n

where:
β is magnetic flux density (gauss).

N is the number of turns in the receiving coil.
r

is the radius of the nth turn in the receiving coil (cm).

n

Given the geometry of the receiving coil in the ADM2682E/

ADM2687E and an imposed requirement that the induced

voltage be, at most, 50% of the 0.5 V margin at the decoder, a
maximum allowable magnetic field is calculated as shown in
Figure 39.

100

For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.2 kgauss induces a
voltage of 0.25 V at the receiving coil. This is about 50% of the
sensing threshold and does not cause a faulty output transition.
Similarly, if such an event occurs during a transmitted pulse
(and is of the worst-case polarity), it reduces the received pulse
from >1.0 V to 0.75 V, which is still well above the 0.5 V sensing
threshold of the decoder.

The preceding magnetic flux density values correspond to
specific current magnitudes at given distances from the

ADM2682E/ADM2687E transformers. Figure 40 expresses

these allowable current magnitudes as a function of frequency
for selected distances. As shown in Figure 40, the ADM2682E/

ADM2687E are extremely immune and can be affected only by

extremely large currents operated at high frequency very close
to the component. For the 1 MHz example, a 0.5 kA current must
be placed 5 mm away from the ADM2682E/ADM2687E to affect
component operation.

1k

DISTANCE = 1m

100

10

DISTANCE = 100mm

1

DISTANCE = 5mm

0.1

MAXIMUM ALL OWABLE CURRENT (kA)

10

1

0.1

DENSITY (kgauss)

0.01

MAXIMUM ALLOWABLE MAGNETIC FLUX

0.001
1k 10k 10M

Figure 39. Maximum Allowable External Magnetic Flux Density

MAGNETIC FIELD FREQUENCY (Hz)

1M

0.01
1k 10k 100M100k 1M 10M

Figure 40. Maximum Allowable Current for Various Current-to-

MAGNETIC F IELD FREQUENCY (Hz)

ADM2682E/ADM2687E Spacings

09927-020

Note that in combinations of strong magnetic field and high
frequency, any loops formed by PCB traces can induce error
voltages sufficiently large to trigger the thresholds of succeeding
circuitry. Take care in the layout of such traces to avoid this
possibility.

100M100k

09927-019

Rev. 0 | Page 17 of 24

ADM2682E/ADM2687E

F

F

APPLICATIONS INFORMATION

PCB LAYOUT

The ADM2682E/ADM2687E isolated RS-422/RS-485 transceiver
contains an isoPower integrated dc-to-dc converter, requiring
no external interface circuitry for the logic interfaces. Power
supply bypassing is required at the input and output supply pins
(see Figure 41). The power supply section of the ADM2682E/

ADM2687E uses an 180 MHz oscillator frequency to pass power

efficiently through its chip-scale transformers. In addition, the
normal operation of the data section of the iCoupler introduces
switching transients on the power supply pins.

Bypass capacitors are required for several operating frequencies.
Noise suppression requires a low inductance, high frequency
capacitor, whereas ripple suppression and proper regulation
require a large value capacitor. These capacitors are connected
between Pin 1 (GND
Pin 8 (GND

) for VCC. The V

1

connected between Pin 9 (GND
Pin 15 (V

) and Pin 16 (GND2). To suppress noise and reduce

ISOIN

ripple, a parallel combination of at least two capacitors is required
with the smaller of the two capacitors located closest to the device.
The recommended capacitor values are 0.1 μF and 10 μF for
V

at Pin 9 and Pin 10 and VCC at Pin 7 and Pin 8. Capacitor

ISOOUT

values of 0.01 μF and 0.1 μF are recommended for V
and Pin 16 and V
practice is to use a very low inductance ceramic capacitor, or its
equivalent, for the smaller value capacitors. The total lead length
between both ends of the capacitor and the input power supply
pin should not exceed 10 mm.

10n

GND

GND

100nF 100nF

1

V

CC

RxD

RE

DE

TxD

V

CC

1

10µF 10µF

100nF 100nF

) and Pin 2 (VCC) and Pin 7 (VCC) and

1

and V

ISOIN

) and Pin 10 (V

2

at Pin 1 and Pin 2. The recommended best

CC

1

2

3

ADM2682E/

ADM2687E

4 13

5 12

6 11

7 10

8 9

16

15

14

capacitors are

ISOOUT

10n

ISOOUT

ISOIN

GND

A

B

Z

Y

GND

) and

at Pin 15

2

2

Figure 41. Recommended PCB Layout

V

ISOIN

V

ISOOUT

09927-125

In applications involving high common-mode transients, ensure
that board coupling across the isolation barrier is minimized.
Furthermore, design the board layout such that any coupling
that does occur equally affects all pins on a given component
side. Failure to ensure this can cause voltage differentials between
pins exceeding the absolute maximum ratings for the device,
thereby leading to latch-up and/or permanent damage.

The ADM2682E/ADM2687E dissipate approximately 675 mW
of power when fully loaded. Because it is not possible to apply
a heat sink to an isolation device, the devices primarily depend
on heat dissipation into the PCB through the GND pins. If the
devices are used at high ambient temperatures, provide a thermal
path from the GND pins to the PCB ground plane. The board
layout in Figure 41 shows enlarged pads for Pin 1, Pin 8, Pin 9,
and Pin 16. Implement multiple vias from the pad to the ground
plane to reduce the temperature inside the chip significantly. The
dimensions of the expanded pads are at the discretion of the
designer and dependent on the available board space.

EMI CONSIDERATIONS

The dc-to-dc converter section of the ADM2682E/ADM2687E
components must, of necessity, operate at very high frequency
to allow efficient power transfer through the small transformers.
This creates high frequency currents that can propagate in circuit
board ground and power planes, causing edge and dipole radiation.
Grounded enclosures are recommended for applications that
use these devices. If grounded enclosures are not possible, good
RF design practices should be followed in the layout of the PCB.
See the AN-0971 Application Note, Recommendations for
Control of Radiated Emissions with isoPower Devices, for more
information.

Rev. 0 | Page 18 of 24

ADM2682E/ADM2687E

E

E

INSULATION LIFETIME

All insulation structures eventually break down when subjected to
voltage stress over a sufficiently long period. The rate of insulation
degradation is dependent on the characteristics of the voltage
waveform applied across the insulation. Analog Devices conducts
an extensive set of evaluations to determine the lifetime of the
insulation structure within the ADM2682E/ADM2687E.

Accelerated life testing is performed using voltage levels higher
than the rated continuous working voltage. Acceleration factors for
several operating conditions are determined, allowing calculation
of the time to failure at the working voltage of interest. The values
shown in Tab l e 9 summarize the peak voltages for 50 years of
service life in several operating conditions. In many cases, the
working voltage approved by agency testing is higher than the
50-year service life voltage. Operation at working voltages higher
than the service life voltage listed leads to premature insulation
failure.

The insulation lifetime of the ADM2682E/ADM2687E depends
on the voltage waveform type imposed across the isolation barrier.
The iCoupler insulation structure degrades at different rates,
depending on whether the waveform is bipolar ac, unipolar ac,
or dc. Figure 42, Figure 43, and Figure 44 illustrate these different
isolation voltage waveforms.

Bipolar ac voltage is the most stringent environment. A 50-year
operating lifetime under the bipolar ac condition determines
the Analog Devices recommended maximum working voltage.

In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50-year service life. The working
voltages listed in Tabl e 9 can be applied while maintaining the
50-year minimum lifetime, provided the voltage conforms to either

e unipolar ac or dc voltage cases. Any cross-insulation voltage

waveform that does not conform to thFigure 43 or Figure 44 should
be treated as a bipolar ac waveform, and its peak voltage should
be limited to the 50-year lifetime voltage value listed in Tabl e 9.

RATED PEAK VOLTAGE

0V

Figure 42. Bipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 43. DC Waveform

RATED PEAK VOLTAGE

NOTES

1. THE VOL TAGE I S SHOWN AS S INUSODIAL FOR ILLUSTRAT ION
PURPOSES ONLY. IT IS M EANT TO REPRESENT ANY VOLTAG
WAVEFO RM VARYING BETWEEN 0 AND SOME L IMIT ING VAL UE.
THE LIMITING VALUE CAN BE POSIT IVE OR NEGATIVE, BUT T H
VOLTAGE CANNOT CROSS 0V.

ISOLATED SU

0V

Figure 44. Unipolar AC Waveform

PPLY CONSIDERATIONS

The typical output voltage of the integrated isoPo

09927-021

09927-023

wer dc-to-dc

09927-022

isolated supply is 3.3 V. The isolated supply in the ADM2682E/

ADM2687E is typically capable of supplying a current of 55 mA

when the junction temperature of the device is kept below 130°C.
This includes the current required by the internal RS-485 circuitry,
and typically, no additional current is available on V

ISOOUT

for

external applications.

Rev. 0 | Page 19 of 24

ADM2682E/ADM2687E

TYPICAL APPLICATIONS

An example application of the ADM2682E/ADM2687E for a full-
duplex RS-485 node is shown in the circuit diagram of Figure 45.
Refer to the PCB Layout section for the recommended placement
of the capacitors shown in this circuit diagram. Placement of
the R

termination resistors depends on the location of the node

T

and the network configuration. Refer to AN-960 Application Note,
RS-485/RS-422 Circuit Implementation Guide, for guidance on
termination.

3.3V/5V POWER
SUPPLY

100nF 10µ F 100nF 10nF

Figure 46 and Figure 47 show typical applications of the

ADM2682E/ADM2687E in half duplex and full duplex RS-485

network configurations. Up to 256 transceivers can be connected to
the RS-485 bus. To minimize reflections, terminate the line at
the receiving end in its characteristic impedance and keep stub
lengths off the main line as short as possible. For half-duplex
operation, this means that both ends of the line must be terminated
because either end can be the receiving end.

100nF 10 µF

V

ISOIN

100nF 10nF

Y

Z

A

R

B

T

09927-124

V

CC

MICROCONTROLL ER

AND UART

GND

1

V

CC

OSCILLATOR

DIGITAL ISOLATIONiCoupler

TxD

DE

RxD

RE

GND

iso

Power DC-TO -DC CONVERT ER

ENCODE

ENCODE

DECODE

1

ISOLATION

BARRIER

V

ISOOUT

RECTIFIER

REGULATOR

TRANSCEIVER

DECODE

DECODE

ENCODE

D

R

ADM2682E/ADM2687E

GND

2

Figure 45. Example Circuit Diagram Using the ADM2682E/ADM2687E

Rev. 0 | Page 20 of 24

ADM2682E/ADM2687E

2

RxD

RE

DE

TxD

NOTES

IS EQUAL T O THE CHARACTERIST IC IMPEDANCE OF THE CABLE.

1. R

T

. ISOLATION NOT SHOWN.

RxD

RE

DE

TxD

ADM2582E/
ADM2587E

R

D

MASTER

R

D

A

B

Z

Y

A

B

Z

Y

MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 256

R

T

ABZYABZY

ADM2682E/

ADM2687E

R

D

ADM2682E/

ADM2687E

R

RxD RE DE TxDRxD RE DE TxD

Figure 46. ADM2682E/ADM2687E Typical Half Duplex RS-485 Network

MAXIMUM NUMBER OF NODES = 256

R

T

ADM2682E/

ADM2687E

A

B

R

T

Z

Y

D

Y

Z

B

R

T

A

R

SLAVE

R

RxD

RE

DE

TxD

D

09927-027

D

TxD

DE

RE

RxD

NOTES

1. R

IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.

T

2. ISOLATION NOT SHOWN.

ADM2682E/

ADM2687E

ADM2682E/

ADM2687E

A B Z Y

R

RxD RE DE TxD

D

A B Z Y

R

RxD RE DE TxD

D

SLAVESLAVE

ADM2682E/
ADM2687E

Figure 47. ADM2682E/ADM2687E Typical Full Duplex RS-485 Network

ADM2682E/

ADM2687E

09927-028

Rev. 0 | Page 21 of 24

ADM2682E/ADM2687E

OUTLINE DIMENSIONS

13.00 (0.5118)

12.60 (0.4961)

9

8

7.60 (0.2992)

7.40 (0.2913)

10.65 (0.4193)

10.00 (0.3937)

2.65 (0.1043)

2.35 (0.0925)

SEATING
PLANE

8°
0°

0.33 (0.0130)

0.20 (0.0079)

0

.

0

.

7

5

2

5

(

0

.

0

2

9

0

.

0

0

9

(

1.27 (0.0500)

0.40 (0.0157)

5

)

45°

8

)

10-12-2010-A

0.30 (0.0118)

0.10 (0.0039)

COPLANARITY

0.10

16

1

1.27

(0.0500)

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.

0.51 (0.0201)

0.31 (0.0122)

BSC

COMPLIANT TO JEDEC STANDARDS MS-013-AC

Figure 48. 16-Lead Standard Small Outline Package with Increased Creepage [SOIC_IC]

Wide Body,

(RI-16-1)

Dimensions shown in millimeters and (inches)

ORDERING GUIDE

Model1 Data Rate (Mbps) Temperature Range Package Description Package Option

ADM2682EBRIZ 16 −40°C to +85°C 16-Lead SOIC_IC RI-16-1
ADM2682EBRIZ-RL7 16 −40°C to +85°C 16-Lead SOIC_IC RI-16-1
ADM2687EBRIZ 0.5 −40°C to +85°C 16-Lead SOIC_IC RI-16-1
ADM2687EBRIZ-RL7 0.5 −40°C to +85°C 16-Lead SOIC_IC RI-16-1
EVAL-ADM2682EEBZ ADM2682E Evaluation Board
EVAL-ADM2687EEBZ ADM2687E Evaluation Board

1

Z = RoHS Compliant Part.

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ADM2682E/ADM2687E

NOTES

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ADM2682E/ADM2687E

NOTES

©2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09927-0-7/11(0)

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