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**ADM3078EARZ-REEL7 ADI芯片详解** **概述** ADI公司的ADM3078EARZ-REEL7是一款符合TIA/EIA RS-485/RS-422标准的高性能数据收发器，旨在提供±15kV的静电放电（ESD）保护，适用于工业控制、能源计量、照明系统、电信、安全系统和仪表等领域的通信应用。这款芯片具备多种数据速率选项，并且在极端温度环境下也能稳定工作。 **主要特性** 1. **ESD保护**：ADM3078EARZ-REEL7在RS-485/RS-422输入/输出引脚上提供了±15kV的ESD保护，确保了设备在复杂环境中的可靠性。 2. **数据速率**：根据型号的不同，数据速率有所差异，ADM3070E/ADM3071E/ADM3072E支持250kbps，ADM3073E/ADM3074E/ADM3075E支持500kbps，而ADM3076E/ADM3077E/ADM3078E则可达到16Mbps，满足不同速度要求的通信需求。 3. **工作模式**：支持半双工和全双工操作，提供了灵活的通信方案。 4. **失效安全接收器**：当输入异常或发生故障时，接收器自动进入安全状态，避免数据损坏。 5. **节点数量**：在总线上最多可以连接256个节点，适用于大规模的分布式系统。 6. **热插拔功能**：DE和RE引脚上的热插拔输入结构允许设备在不中断系统的情况下安全接入或移除。 7. **低电磁干扰（EMI）**：通过降低摆率来减少电磁辐射，提升系统兼容性。 8. **低功耗**：在关断状态下，大部分型号的电流消耗极低（除ADM3071E/ADM3074E/ADM3077E外）。 9. **高阻态输出**：当芯片被禁用或电源关闭时，输出端口变为高阻态，防止对总线产生影响。 10. **共模输入范围**：共模输入范围为-7V至+12V，保证了宽范围的信号稳定性。 11. **热保护和短路保护**：内置热保护和短路保护机制，确保设备在异常条件下的安全性。 **封装形式** ADM307xE系列提供了8引脚和14引脚的窄体小外形集成电路（SOIC）封装，适应不同的空间要求和设计布局。 **应用场景** 这款芯片广泛应用于需要可靠、高速通信的系统，如电力/能源测量中的远程通讯，工业控制系统中的设备间交互，照明系统的智能控制，电信网络的数据传输，安全系统的监控通讯以及各种仪器设备的内部数据交换。 **总结** ADM3078EARZ-REEL7是ADI公司针对工业级通信需求设计的一款高效、可靠的RS-485/RS-422收发器，其丰富的功能和坚固的防护措施使其成为各种恶劣环境下数据传输的理想选择。结合其多种数据速率、低功耗和强大的ESD保护，这款芯片能够确保系统的长期稳定运行。

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3.3 V, ±15 kV ESD-Protected, Half- and

Full-Duplex, RS-485/RS-422 Transceivers

ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E

Rev. F Document Feedback

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.

Technical Support www.analog.com

FEATURES

TIA/EIA RS-485/RS-422 compliant

±15 kV ESD protection on RS-485 input/output pins

Data rates

ADM3070E/ADM3071E/ADM3072E: 250 kbps

ADM3073E/ADM3074E/ADM3075E: 500 kbps

ADM3076E/ADM3077E/ADM3078E: 16 Mbps

Half- and full-duplex options

True fail-safe receiver inputs

Up to 256 nodes on the bus

−40°C to +125°C temperature option

Hot-swap input structure on DE and

pins

Reduced slew rates for low EMI

Low power shutdown current (all except ADM3071E/

ADM3074E/ADM3077E)

Outputs high-Z when disabled or powered off

Common-mode input range: −7 V to +12 V

Thermal shutdown and short-circuit protection

8-lead and 14-lead narrow SOIC packages

APPLICATIONS

Power/energy metering

Industrial control

Lighting systems

Telecommunications

Security systems

Instrumentation

GENERAL DESCRIPTION

The ADM307xE 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: RS-485 and RS-422.

The devices have a ⅛ unit load receiver input impedance, which

allows up to 256 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.

The receiver inputs have a true fail-safe feature, which eliminates

the need for external bias resistors and ensures a logic high

output level when the inputs are open or shorted. This guar-

antees that the receiver outputs are in a known state before

communication begins and when communication ceases.

FUNCTIONAL BLOCK DIAGRAMS

ADM3070E/

ADM3073E/

ADM3076E

GND

06285-001

igure 1.

ADM3071E/

ADM3074E/

ADM3077E

GND

06285-002

igure 2.

ADM3072E/

ADM3075E/

ADM3078E

GND

06285-003

igure 3.

ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E

Rev. F | Page 2 of 20

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

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

Functional Block Diagrams ............................................................. 1

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

Specifications ..................................................................................... 4

Timing Specifications—

ADM3070E/ADM3071E/ADM3072E ....................................... 5

Timing Specifications—

ADM3073E/ADM3074E/ADM3075E ....................................... 6

Timing Specifications—

ADM3076E/ADM3077E/ADM3078E ....................................... 7

Absolute Maximum Ratings ............................................................ 8

ESD Caution .................................................................................. 8

Pin Configurations and Function Descriptions ........................... 9

Test Circuits and Switching Characteristics ................................ 10

Typical Performance Characteristics ........................................... 12

Circuit Description......................................................................... 15

Function Tables ........................................................................... 15

Receiver Fail-Safe ....................................................................... 15

Hot-Swap Capability .................................................................. 16

Line Length vs. Data Rate ......................................................... 16

±15 kV ESD Protection ............................................................. 16

Human Body Model .................................................................. 16

256 Transceivers on the Bus ...................................................... 16

Reduced EMI and Reflections .................................................. 16

Low Power Shutdown Mode ..................................................... 17

Driver Output Protection .......................................................... 17

Typical Applications ................................................................... 17

Outline Dimensions ....................................................................... 19

Ordering Guide .......................................................................... 20

REVISION HISTORY

9/2019—Rev. E to Rev. F

Changes to Table 6 ............................................................................ 8

8/2009—Rev. D to Rev. E

Changes to Ordering Guide .......................................................... 20

4/2009—Rev. C to Rev. D

Changes to Ordering Guide .......................................................... 20

1/2009—Rev. B to Rev. C

Changes to Ordering Guide .......................................................... 20

8/2008—Rev. A to Rev. B

Changes to Table 3 ............................................................................. 5

Changes to Figure 36 ...................................................................... 18

Updated Outline Dimensions ....................................................... 19

Changes to Ordering Guide .......................................................... 20

10/2006—Rev. 0 to Rev. A

Added ADM3077E and ADM3078E ............................... Universal

Changes to Figure 2 and Figure 3 .................................................... 1

Changes to Figure 5 and Figure 6 .................................................... 9

Changes to Figure 34 and Figure 35............................................. 17

Updated Outline Dimensions ....................................................... 19

Changes to Ordering Guide .......................................................... 20

8/06—Revision 0: Initial Version

ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E

Rev. F | Page 4 of 20

SPECIFICATIONS

= 3.3 V ± 10%, T

= T

MIN

to T

MAX

, unless otherwise noted.

Table 2. ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E

Parameter Symbol Min Typ Max Unit Test Conditions/Comments

DRIVER

Differential Outputs

Differential Output Voltage V

2.0 V

V R

= 100 Ω (RS-422) (see Figure 7)

1.5 V

V R

= 54 Ω (RS-485) (see Figure 7)

V No load

Δ|V

| for Complementary Output States

ΔV

0.2 V R

= 54 Ω or 100 Ω (see Figure 7)

Common-Mode Output Voltage V

/2 3 V R

= 54 Ω or 100 Ω (see Figure 7)

Δ|V

| for Complementary Output States

ΔV

0.2 V R

= 54 Ω or 100 Ω (see Figure 7)

Short-Circuit Output Current I

OSD

40 250 mA 0 V < V

OUT

< 12 V

−250 −40 mA −7 V < V

OUT

< V

Short-Circuit Foldback Output Current I

OSDF

20 mA (V

− 1 V) < V

OUT

< 12 V

−20 mA −7 V < V

OUT

< +1 V

Output Leakage (Y, Z) Full Duplex I

125 µA

DE = 0 V,

RE = 0 V, V

= 0 V or 3.6 V, V

= 12 V

−100 µA

DE = 0 V,

RE = 0 V, V

= 0 V or 3.6 V, V

= −7 V

Logic Inputs

Input High Voltage V

2.0 V

DE, DI,

Input Low Voltage V

0.8 V

DE, DI,

Input Hysteresis V

HYS

100 mV

DE, DI,

Logic Input Current I

±1 µA

DE, DI,

Input Impedance First Transition 1 10 kΩ DE

Thermal Shutdown Threshold T

175 °C

Thermal Shutdown Hysteresis T

TSH

15 °C

RECEIVER

Differential Inputs

Differential Input Threshold Voltage V

−200 −125 −50 mV −7 V < V

< +12 V

Input Hysteresis ΔV

15 mV V

+ V

= 0 V

Input Resistance (A, B) R

96 kΩ −7 V < V

< +12 V

Input Current (A, B)

, I

125 µA DE = 0 V, V

= 0 V or 3.6 V, V

= 12 V

−100 µA DE = 0 V, V

= 0 V or 3.6 V, V

= −7 V

RO Logic Output

Output High Voltage V

− 0.6 V I

OUT

= −1 mA

Output Low Voltage V

0.4 V I

OUT

= 1 mA

Short-Circuit Output Current I

OSR

±80 mA 0 V < V

< V

Tristate Output Leakage Current I

OZR

±1 µA V

= 3.6 V, 0 V < V

OUT

< V

POWER SUPPLY

Supply Current I

0.8 1.5 mA

No load, DE = V

, RE = 0 V

0.8 1.5 mA

No load, DE = V

, RE = V

0.8 1.5 mA

No load, DE = 0 V,

RE = 0 V

Shutdown Current

SHDN

0.05 10 µA

DE = 0 V,

RE = V

ESD PROTECTION

A, B, Y, Z Pins ±15 kV Human body model

All Pins Except A, B, Y, Z Pins ±4 kV Human body model

Δ|V

| and Δ|V

| are the changes in V

and V

, respectively, when the DI input changes state.

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