ADM202EARN Analog Devices Inc, ADM202EARN Datasheet - Page 7

• Manufacturer Part Number: ADM202EARN
• Description: RS-232 LINE DRIVER/RECEIVER, DRIVER/RECEIVER, 4.5 TO 5.5 VSUPPLY VOLTAGE, 16 LEAD, NARROW SOIC, ADM202, RS-232 INTERFACE
• Manufacturer: Analog Devices Inc
• Type: Transceiverr

Specifications of ADM202EARN

• Rohs Status: RoHS non-compliant
• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Data Rate: 230Kbps
• Interface Circuit Standard 1: EIA/TIA-232-E/RS-232
• Number Of Receivers: 2
• Number Of Transmitters: 2
• Number Of Transceivers: 2
• Data Transmission Topology: Point-to-Point
• Receiver Signal Type: Single-Ended
• Transmitter Signal Type: Single-Ended
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.5V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Supply Current: 18mA
• Power Supply Requirement: Single
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: SOIC N
• Lead Free Status / Rohs Status: Not Compliant

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.
The transmitter outputs and receiver inputs have a similar
protection structure. The receiver inputs can dissipate some of
the energy through the internal 5 kΩ 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.
Rev. C | Page 7 of 16
RECEIVER
INPUT
Figure 9. Transmitter Output Protection Scheme
Figure 8. Receiver Input Protection Scheme
R
X
R1
D2
D1
R
T
ADM202E/ADM1181A
OUT
IN
D2
D1
TRANSMITTER
OUTPUT
R
X