ADM2582E/ADM2587E：带隔离的RS-485/RS-422信号转换器
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更新于2024-07-20
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"这篇文档是关于Analog Devices公司的信号和电源隔离RS-485收发器ADM2582E/ADM2587E的介绍，它强调了其在电磁兼容性方面的优势，提供了±15kV ESD保护，并符合ANSI/TIA/EIA-485-A-98和ISO8482:1987(E)标准，适用于需要隔离的422通信应用。"
在工业和自动化领域，数据传输的可靠性和抗干扰能力至关重要，这就是为什么AD的ADM2582E和ADM2587E隔离式RS-485/RS-422收发器如此重要的原因。这些器件设计用于在恶劣的电磁环境下工作，能有效提高系统的电磁兼容性（EMC），从而降低因电磁干扰导致的数据错误和系统故障。
ADM2582E和ADM2587E的主要特性包括：
1. **隔离RS-485/RS-422收发器**：这种设计使得数据传输在物理上与电源和信号路径隔离开，能够防止高压尖峰或地电位差对设备造成损害，同时也能防止设备间的相互影响。
2. **isoPower®集成隔离dc-to-dc转换器**：内置的隔离电源转换器确保了电源和信号之间的电气隔离，进一步增强了系统的安全性和稳定性。
3. **±15kV ESD保护**：在RS-485/422输入/输出引脚上提供这样的静电放电保护，可以防止由于人体或其他ESD事件对电路造成的潜在破坏。
4. **符合标准**：这些收发器遵循ANSI/TIA/EIA-485-A-98和ISO8482:1987(E)标准，确保了与业界广泛接受的接口协议兼容。
5. **数据速率**：ADM2582E支持高达16Mbps的数据传输率，而ADM2587E则支持500kbps，这使得它们适用于高速和低速的不同通信需求。
6. **5V或3.3V操作**：兼容不同电压系统的运行，增加了灵活性。
7. **节点数量**：一个总线上可以连接多达256个节点，满足大规模网络的构建。
8. **安全功能**：开放和短路检测以及故障安全接收输入，确保了在网络出现异常时能自动进入安全状态，降低了系统故障的风险。
这些特性使得ADM2582E/ADM2587E成为需要高可靠性、强电磁兼容性的远程通信、分布式控制系统、工业自动化和仪表与控制应用的理想选择。通过使用这些隔离422芯片，系统设计师可以提高其产品的整体性能和耐用性，同时减少因电磁干扰引起的维护问题。
ADM2582E/ADM2587E
Rev. 0 | Page 4 of 20
ADM2582E TIMING SPECIFICATIONS
T
A
= −40°C to +85°C.
Table 2.
Parameter Symbol Min Typ Max Unit Test Conditions
DRIVER
Maximum Data Rate 16 Mbps
Propagation Delay, Low to High t
DPLH
63 100 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Propagation Delay, High to Low t
DPHL
64 100 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Output Skew t
SKEW
1 8 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Rise Time/Fall Time t
DR
, t
DF
15 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Enable Time t
ZL
, t
ZH
120 ns R
L
= 110 Ω, C
L
= 50 pF, see Figure 26 and Figure 31
Disable Time t
LZ
, t
HZ
150 ns R
L
= 110 Ω, C
L
= 50 pF, see Figure 26 and Figure 31
RECEIVER
Propagation Delay, Low to High t
RPLH
94 110 ns C
L
= 15 pF, see Figure 27 and Figure 30
Propagation Delay, High to Low t
RPHL
95 110 ns C
L
= 15 pF, see Figure 27 and Figure 30
Output Skew
1
t
SKEW
1 12 ns C
L
= 15 pF, see Figure 27 and Figure 30
Enable Time t
ZL
, t
ZH
15 ns R
L
= 1 kΩ, C
L
= 15 pF, see Figure 28 and Figure 32
Disable Time t
LZ
, t
HZ
15 ns R
L
= 1 kΩ, C
L
= 15 pF, see Figure 28 and Figure 32
1
Guaranteed by design.
ADM2587E TIMING SPECIFICATIONS
T
A
= −40°C to +85°C.
Table 3.
Parameter Symbol Min Typ Max Unit Test Conditions
DRIVER
Maximum Data Rate 500 kbps
Propagation Delay, Low to High t
DPLH
250 503 700 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Propagation Delay, High to Low t
DPHL
250 510 700 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Output Skew t
SKEW
7 100 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Rise Time/Fall Time t
DR
, t
DF
200 1100 ns R
L
= 54 Ω, C
L1
= C
L2
= 100 pF, see Figure 25 and Figure 29
Enable Time t
ZL
, t
ZH
2.5 μs R
L
= 110 Ω, C
L
= 50 pF, see Figure 26 and Figure 31
Disable Time t
LZ
, t
HZ
200 ns R
L
= 110 Ω, C
L
= 50 pF, see Figure 26 and Figure 31
RECEIVER
Propagation Delay, Low to High t
RPLH
91 200 ns C
L
= 15 pF, see Figure 27 and Figure 30
Propagation Delay, High to Low t
RPHL
95 200 ns C
L
= 15 pF, see Figure 27 and Figure 30
Output Skew t
SKEW
4 30 ns C
L
= 15 pF, see Figure 27 and Figure 30
Enable Time t
ZL
, t
ZH
15 ns R
L
= 1 kΩ, C
L
= 15 pF, see Figure 28 and Figure 32
Disable Time t
LZ
, t
HZ
15 ns R
L
= 1 kΩ, C
L
= 15 pF, see Figure 28 and Figure 32
ADM2582E/ADM2587E PACKAGE CHARACTERISTICS
Table 4.
Parameter Symbol Min Typ Max Unit Test Conditions
Resistance (Input-to-Output)
1
R
I-O
10
12
Ω
Capacitance (Input-to-Output)
1
C
I-O
3 pF f = 1 MHz
Input Capacitance
2
C
I
4 pF
Input IC Junction-to-Case Thermal Resistance θ
JCI
33 °C/W
Thermocouple located at center of
package underside
Output IC Junction-to-Case Thermal Resistance θ
JCO
28 °C/W
Thermocouple located at center of
package underside
1
Device considered a 2-terminal device: short together Pin 1 to Pin 10 and short together Pin 11 to Pin 20.
2
Input capacitance is from any input data pin to ground.
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