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参数资料
| 型号： | ADM1181AARWZ-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通用总线功能 |
| 英文描述： | EMI/EMC-Compliant, +-15 kV, ESD-Protected RS-232 Line Drivers/Receivers |
| 中文描述： | DUAL LINE TRANSCEIVER, PDSO16 |
| 封装： | LEAD FREE, MS-013AA, SOIC-16 |
| 文件页数： | 7/16页 |
| 文件大小： | 244K |
| 代理商： | ADM1181AARWZ-REEL |
ADM202E/ADM1181A
ESD/EFT TRANSIENT PROTECTION SCHEME
The ADM202E/ADM1181A use protective clamping structures
on all inputs and outputs to clamp the voltage to a safe level and
dissipate the energy present in electrostatic (ESD) and electrical
fast transients (EFT) discharges. A simplified schematic of the
protection structure is shown in Figure 8 and Figure 9. Each
input and output contains two back-to-back high speed
clamping diodes. During normal operation with maximum
RS-232 signal levels, the diodes have no effect because one or
the other is reverse biased depending on the polarity of the signal.
However, if the voltage exceeds about 50 V in either direction,
reverse breakdown occurs and the voltage is clamped at this level.
The diodes are large p-n junctions that are designed to handle
instantaneous current surges that exceed several amperes.
Rev. C | Page 7 of 16
The transmitter outputs and receiver inputs have a similar
protection structure. The receiver inputs can dissipate some of
the energy through the internal 5 k resistor to GND, as well as
through the protection diodes.
The protection structure achieves ESD protection up to ±15 kV
and EFT protection up to ±2 kV on all RS-232 I/O lines. The
methods used to test the protection scheme are discussed in the
ESD Testing (IEC1000-4-2) and Fast Transient/Burst Testing
(IEC1000-4-4) sections.
R
IN
R
X
D1
D2
RECEIVER
INPUT
R1
0
Figure 8. Receiver Input Protection Scheme
R
X
D1
D2
TRANSMITTER
OUTPUT
T
OUT
0
Figure 9. Transmitter Output Protection Scheme
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