ANALOG DEVICES ADM3101E Service Manual
±15 kV ESD Protected, 3.3 V Single-Channel
T
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FEATURES
460 kbps data rate
1 Tx and 1 Rx
Meets EIA/TIA-232E specifications
0.1 μF charge pump capacitors
Contact discharge: ±8 kV
Air gap discharge: ±15 kV
APPLICATIONS
General-purpose RS-232 data links
Industrial/telecommunications diagnostics ports
GENERAL DESCRIPTION
The ADM3101E is a high speed, single-channel, RS-232/
ITU-T V.28 transceiver interface device that operates from
a single 3.3 V power supply. Low power consumption makes
it ideal for battery-powered portable instruments.
The ADM3101E conforms to the EIA/TIA-232E and ITU-T V.28
specifications and operates at data rates of up to 460 kbps.
All RS-232 (T
and outputs are protected against electrostatic discharges (up
to ±15 kV ESD protection).
and RIN) and CMOS (TIN and R
OUT
) inputs
OUT
RS-232 Line Driver/Receiver
ADM3101E
FUNCTIONAL BLOCK DIAGRAM
+3.3V INPU
+
+
CMOS
INPUT
C1+
+3.3V TO +6.6V
VOLTAGE DOUBLER
C1–
C2+
+6.6V TO –6.6V
VOLTAGE INVERTER
C2–
T
IN
T
0.1µF
16V
0.1µF
16V
C1
C2
ADM3101E
R
CMOS
OUTPUT
*INTERNAL 5k PULL-DOWN
RESISTOR ON THE RS-232 INPUT.
OUT
R
GND
Figure 1.
Because of the ±15 kV ESD protection of the ADM3101E
input/output pins, this device is ideally suited for operation
in electrically harsh environments or where RS-232 cables are
frequently plugged and unplugged.
Four external 0.1 μF charge pump capacitors are used for the
voltage doubler/inverter permitting operation from a single
3.3 V supply.
The ADM3101E is available in both a 12-lead LFCSP and 16-lead
QSOP, specified over the −40°C to +85°C temperature range.
V
T
OUT
CC
V+
V–
R
IN
C3
+
0.1µF
6.3V
C4
+
0.1µF
16V
EIA/TI A-232E
OUTPUT
EIA/TI A-232E
INPUT*
+
C5
0.1µF
6766-001
Rev. C
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.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007–2008 Analog Devices, Inc. All rights reserved.
ADM3101E
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TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
REVISION HISTORY
7/08—Rev. B to Rev. C
Changes to General Description Section ...................................... 1
Reformatted Table 1 ......................................................................... 4
Change to T
Changes to Figure 2 .......................................................................... 5
Moved High Baud Rate Section ...................................................... 8
Added Exposed Pad Notation to Outline Dimensions ............... 9
12/07—Rev. A to Rev. B
Added 16-lead QSOP Package (Universal) ................................... 1
Updated Outline Dimensions ....................................................... 10
Changes to Ordering Guide .......................................................... 10
Rating, Table 2 ......................................................... 4
IN
Pin Configurations and Function Descriptions ............................5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................8
Circuit Description .......................................................................8
High Baud Rate ..............................................................................8
Outline Dimensions ..........................................................................9
Ordering Guide .............................................................................9
10/07—Rev. 0 to Rev. A
Changes to Figure 1 ........................................................................... 1
Changes to Table 1, RS-232 Receiver Section ................................ 3
Changes to Table 3 ............................................................................. 5
Changes to Figure 11 ......................................................................... 8
5/07—Revision 0: Initial Version
Rev. C | Page 2 of 12
ADM3101E
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SPECIFICATIONS
VCC = 3.3 V ± 0.3 V, C1 to C4 = 0.1 μF, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 1.
Parameter Test Conditions/Comments Min Typ Max Unit
DC CHARACTERISTICS
Operating Voltage Range 3.0 3.3 5.5 V
Power Supply Current, VCC No load 1.5 2.6 mA
R
LOGIC
Input Logic Threshold Low, V
Input Logic Threshold High, V
Input Logic Threshold Low, V
Input Logic Threshold High, V
TIN 0.6 V
INL
TIN 1.4 V
INH
TIN, VCC = 5.0 V ± 0.5 V 0.8 V
INL
TIN, VCC = 5.0 V ± 0.5 V 2.0 V
INH
CMOS Output Voltage Low, VOL I
CMOS Output Voltage High, VOH
Logic Pull-Up Current TIN = GND to VCC 5 12 μA
RS-232 RECEIVER
EIA/TIA-232E Input Voltage Range
1
−30 +30 V
EIA/TIA-232E Input Threshold Low VCC = 3.0 V to 5.5 V 0.6 1.3 V
EIA/TIA-232E Input Threshold High 1.6 2.4 V
EIA/TIA-232E Input Hysteresis 0.4 V
EIA/TIA-232E Input Resistance 3 5 7 kΩ
TRANSMITTER
Output Voltage Swing
RS-232
RS-562 VCC = 3.0 V ±4.5 V
Transmitter Output Resistance VCC = 0 V, V
RS-232 Output Short-Circuit Current ±15 mA
TIMING CHARACTERISTICS
Maximum Data Rate VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF 460 kbps
Receiver Propagation Delay
t
0.4 μs
PHL
t
0.4 μs
PLH
Transmitter Propagation Delay RL = 3 kΩ, CL = 1000 pF 600 ns
Transmitter Skew 80 ns
Receiver Skew 70 ns
Transition Region Slew Rate
ESD PROTECTION
RS-232 and CMOS I/O Pins Human body model air discharge ±15 kV
Human body model contact discharge ±8 kV
1
Guaranteed by design.
= 3 kΩ to GND 5 7 mA
L
= 1.6 mA 0.4 V
OUT
I
= −1 mA
OUT
= 3.3 V to 5.5 V; transmitter output loaded
V
CC
VCC − 0.6 V
±5.0 ±5.7 V
with 3 kΩ to ground
1
= ±2 V
OUT
+3 V to −3 V or −3 V to +3 V, V
R
= 3 kΩ, CL = 1000 pF, TA = 25°C
L
300 Ω
= +3.3 V,
CC
1
5.5 10 30 V/μs
Rev. C | Page 3 of 12
ADM3101E
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ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
VCC −0.3 V to +6 V
V+ (VCC − 0.3 V) to +13 V
V− +0.3 V to −13 V
Input Voltages
T
−0.3 V to (VCC + 0.3 V)
IN
RIN ±30 V
Output Voltages
T
±15 V
OUT
R
−0.3 V to (VCC + 0.3 V)
OUT
Short-Circuit Duration
T
OUT
Package Information
θJA, Thermal Impedance (LFCSP) 61.1°C/W
θJA, Thermal Impedance (QSOP) 149.97°C/W
Operating Temperature Range
Industrial (A Version) −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Pb-Free Temperature (Soldering, 10 sec) 260°C
Continuous
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. C | Page 4 of 12
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