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參數資料
| 型號： | ADM3485EAN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | ESD Protected, EMC Compliant, 3.3 V, 20 Mbps, EIA RS-485 Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDIP8 |
| 封裝： | MO-095AA, PLASTIC, DIP-8 |
| 文件頁數： | 9/11頁 |
| 文件大小： | 119K |
| 代理商： | ADM3485EAN |
ADM3485E
–9–
REV. A
100%
90%
36.8%
10%
t
RL
t
DL
I
P
TIME
t
Figure 21. Human Body Model Current Waveform
Table IV. ESD Test Results
ESD Test Method
I-O Pins
±
8 kV
IEC1000-4-2: Contact
TIME
t
100%
90%
10%
I
P
0.1 TO 1ns
30ns
60ns
Figure 22. IEC1000-4-2 ESD Current Waveform
FAST TRANSIENT BURST IMMUNITY (IEC1000-4-4)
IEC1000-4-4 (previously 801-4) covers electrical fast-transient/
burst (EFT) immunity. Electrical fast transients occur as a
result of arcing contacts in switches and relays. The tests simu-
late the interference generated when, for example, a power relay
disconnects an inductive load. A spark is generated due to the
well known back EMF effect. In fact, the spark consists of a
burst of sparks as the relay contacts separate. The voltage ap-
pearing on the line, therefore, consists of a burst of extremely
fast transient impulses. A similar effect occurs when switching
on fluorescent lights.
The fast transient burst test, defined in IEC1000-4-4, simulates
this arcing and its waveform is illustrated in Figure 23. It con-
sists of a burst of 2.5 kHz to 5 kHz transients repeating at
300 ms intervals. It is specified for both power and data lines.
Four severity levels are defined in terms of an open-circuit volt-
age as a function of installation environment. The installation
environments are defined as
1. Well-Protected
2. Protected
3. Typical Industrial
4. Severe Industrial
300ms
16ms
5ns
50ns
0.2/0.4ms
t
t
V
V
Figure 23. IEC1000-4-4 Fast Transient Waveform
Table V shows the peak voltages for each of the environments.
Table V. Peak Voltages
Level
V
PEAK
(kV) PSU
0.5
1
2
4
V
PEAK
(kV) I-O
0.25
0.5
1
2
1
2
3
4
A simplified circuit diagram of the actual EFT generator is
illustrated in Figure 24.
HIGH
VOLTAGE
SOURCE
R
C
C
C
L
Z
S
R
M
C
D
50
OUTPUT
Figure 24. EFT Generator
These transients are coupled onto the signal lines using an EFT
coupling clamp. The clamp is 1 m long and completely sur-
rounds the cable, providing maximum coupling capacitance
(50 pF to 200 pF typ) between the clamp and the cable. High
energy transients are capacitively coupled onto the signal lines.
Fast rise times (5 ns) as specified by the standard result in very
effective coupling. This test is very severe since high voltages are
coupled onto the signal lines. The repetitive transients can often
cause problems, where single pulses do not. Destructive latchup
may be induced due to the high energy content of the transients.
Note that this stress is applied while the interface products are
powered up and are transmitting data. The EFT test applies
hundreds of pulses with higher energy than ESD. Worst case
transient current on an I-O line can be as high as 40 A.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADM3485EANZ | 制造商:Rochester Electronics LLC 功能描述:3 VOLT RS-485 HIGH ESD I.C. - Bulk 制造商:Analog Devices 功能描述:TRANSCEIVER RS485/422 3.3V 3485 |
| ADM3485EAR | 功能描述:IC TX/RX RS-485 HS 3.3V 8-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 標準包裝:27 系列:- 類型:收發器 驅動器/接收器數:3/3 規程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| ADM3485EAR-REEL | 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-422/RS-485 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:3 VOLT RS-485 HIGH ESD I.C. - Tape and Reel 制造商:Analog Devices 功能描述:IC TRANSCEIVER RS485 |
| ADM3485EAR-REEL7 | 功能描述:IC TXRX RS-485 HS 3.3V 8SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 標準包裝:121 系列:- 類型:收發器 驅動器/接收器數:1/1 規程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| ADM3485EARZ | 功能描述:IC TX/RX RS-485 HS 3.3V 8-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 產品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發器 驅動器/接收器數:1/1 規程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
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