ANALOG DEVICES ADM231L Service Manual
T
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5 V-Powered
ADM231L–ADM234L/ADM236L–ADM241L
CMOS RS-232 Drivers/Receivers
FEATURES
Single 5 V power supply
Meets all EIA-232-E and V.28 specifications
120 kbps data rate
On-board dc-to-dc converters
±9 V output swing with 5 V supply
Small 1 µF capacitors
Low power shutdown ≤1 µA
±30 V receiver input levels
Latch-up free
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
GENERAL DESCRIPTION
The ADM2xx family of line drivers/receivers is intended for all
ADM236L TYPICAL OPERATING CIRCUIT
+5V INPUT
R1
R2
R3
ADM236L
V
CC
V+
V–
TL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
C1+
C1–
C2+
C2–
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO –10V
VOLTAGE
INVERTER
T1
T2
T3
T4
GND
1µF
+6.3V
1µF
+16V
T1
IN
T2
IN
1
T3
IN
T4
IN
R1
OUT
R2
OUT
R3
OUT
EN
1µF
+6.3V
1µF
+16V
T1
OUT
T2
OUT
T3
OUT
T4
OUT
R1
IN
R2
IN
R3
IN
SD
RS-232
OUTPUTS
RS-232
INPUTS
EIA-232-E and V.28 communications interfaces, especially in
1
applications in which 12 V is not available. The ADM236L and
ADM241L feature a low power shutdown mode that reduces
power dissipation to less than 5 µW, making them ideally suited
for battery-powered equipment. The ADM233L does not
require any external components and is particularly useful in
applications where printed circuit board space is critical.
All members of the ADM2xxL family, except the ADM231L and
ADM239L, include two internal charge pump voltage converters
that allow operation from a single 5 V supply. These parts convert
the 5 V input power to the ±10 V required for RS-232 output
levels. The ADM231L and ADM239L are designed to operate
from 5 V and 12 V supplies. An internal +12 V to −12 V charge
pump voltage converter generates the −12 V supply.
The ADM2xxL is an enhanced upgrade to the AD2xx family. It
features lower power consumption, faster slew rate, and the
ability to operate with smaller (1 µF) capacitors.
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 1.
Table 1. Selection Table
Part
Number
Power Supply Voltage
No. of RS-232
Drivers
No. of RS-232
Receivers
External
Capacitors
Low Power
Shutdown (SD)
ADM231L 5 V and 7.5 V to 13.2 V 2 2 2 No No 14
ADM232L 5 V 2 2 4 No No 16
ADM233L 5 V 2 2 None No No 20
ADM234L 5 V 4 0 4 No No 16
ADM236L 5 V 4 3 4 Yes Yes 24
ADM237L 5 V 5 3 4 No No 24
ADM238L 5 V 4 4 4 No No 24
ADM239L 5 V and 7.5 V to 13.2 V 3 5 2 No Yes 24
ADM241L 5 V 4 5 4 Yes Yes 28
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 © 2005 Analog Devices, Inc. All rights reserved.
TTL
Three-State
EN
No. of
Pins
1µF
+6.3V
2
00070-0-015
ADM231L–ADM234L/ADM236L–ADM241L
www.BDTIC.com/ADI
TABLE OF CONTENTS
Specifications..................................................................................... 3
General Information...................................................................... 12
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configurations and Function Descriptions ........................... 5
Typical Performance Characteristics ............................................. 8
Typical Operating Circuits .............................................................. 9
REVISION HISTORY
4/05—Rev. B to Rev. C
Updated Format..................................................................Universal
Removed ADM223, ADM230L, and ADM235L............Universal
Changed Hysteresis Level..................................................Universal
Changes to Specifications Table...................................................... 3
Updated Outline Dimensions....................................................... 14
Changes to Ordering Guide.......................................................... 17
5/01—Rev. A to Rev. B
Edits to Test Conditions/Comments of Specifications................ 2
1/01—Rev. 0 to Rev. A
Removed ESD information from Features section ...................... 1
Changes to Specifications Table...................................................... 2
Removed ESD information from
Absolute Maximum Ratings section .............................................. 2
Circuit Description .................................................................... 12
Application Hints ....................................................................... 13
Outline Dimensions....................................................................... 14
Ordering Guide .......................................................................... 17
Revision 0: Initial Version
Rev. C | Page 2 of 20
ADM231L–ADM234L/ADM236L–ADM241L
www.BDTIC.com/ADI
SPECIFICATIONS
VCC = 5 V ± 10% (ADM231L, ADM232L, ADM234L, ADM236L, ADM238L, ADM239L, ADM241L); VCC = 5 V ± 5% (ADM233L and
ADM237L); V+ = 7.5 V to 13.2 V (ADM231L and ADM239L); C1 to C4 = 1.0 µF ceramic. All specifications T
MIN
to T
otherwise noted.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
Output Voltage Swing ±5 ±9 V
All transmitter outputs loaded with 3 kΩ to ground
VCC Power Supply Current 2.5 6.0 mA No load, (ADM232L only)
3.5 13 mA No load
V+ Power Supply Current 1.5 4 mA No load, V+ = 12 V (ADM231L and ADM239L only)
Shutdown Supply Current 1 10 µA
Input Logic Threshold Low, V
Input Logic Threshold High, V
0.8 V
INL
2.0 V
INH
, EN, SD, EN, SD
T
IN
, EN, SD, EN, SD
T
IN
Logic Pull-Up Current 12 25 µA
RS-232 Input Voltage Range1 –30 +30 V TIN = 0 V
RS-232 Input Threshold Low 0.8 1.2 V
RS-232 Input Threshold High 1.6 2.4 V
RS-232 Input Hysteresis 0.65 V
RS-232 Input Resistance 3 5 7 kΩ TA = 0°C to 85°C
TTL/CMOS Output Voltage Low, VOL 0.4 V
TTL/CMOS Output Voltage High, VOH 3.5 V I
TTL/CMOS Output Leakage Current +0.05 ±10 µA
= −1.0 mA
OUT
= VCC, 0 V ≤ R
EN
OUT
≤ VCC
Output Enable Time (TEN) 250 ns ADM236L, ADM239L, ADM241L (Figure 31, CL = 150 pF)
Output Disable Time (T
50 ns ADM236L, ADM239L, ADM241L (Figure 31, RL = 1 kΩ)
DIS)
Propagation Delay 0.3 µs RS-232 to TTL
Transition Region Slew Rate 8 V/µs RL = 3 kΩ, CL = 2500 pF, measured from +3 V to −3 V or −3 V to +3 V
Output Resistance 300 Ω VCC = V+ = V– = 0 V, V
= ±2 V
OUT
RS-232 Output Short-Circuit Current ±10 mA
1
Guaranteed by design.
MAX
, unless
Rev. C | Page 3 of 20
ADM231L–ADM234L/ADM236L–ADM241L
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ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameter Rating
VCC –0.3 V to +6 V
V+ (VCC – 0.3 V) to +14 V
V– +0.3 V to −14 V
Input Voltages
TIN –0.3 V to (VCC + 0.3 V)
RIN ±30 V
Output Voltages
T
(V+, +0.3 V) to (V–, –0.3 V)
OUT
R
–0.3 V to (VCC + 0.3 V)
OUT
Short-Circuit Duration
T
Continuous
OUT
Power Dissipation
N-14 PDIP (Derate 10 mW/°C
above 70°C)
N-16 PDIP (Derate 10.5 mW/°C
above 70°C)
N-20 PDIP (Derate 11 mW/°C
above 70°C)
N-24-1 PDIP (Derate
13.5 mW/°C above 70°C)
R-16 SOIC (Derate 9 mW/°C
above 70°C)
R-24 SOIC (Derate 12 mW/°C
above 70°C)
R-28 SOIC (Derate 12.5 mW/°C
above 70°C)
RS-28 SSOP (Derate 10 mW/°C
above 70°C)
800 mW
840 mW
890 mW
1000 mW
760 mW
850 mW
900 mW
900 mW
Parameter Rating
Q-14 CERDIP (Derate 10 mW/°C
above 70°C)
Q-16 CERDIP (Derate 10 mW/°C
above 70•C)
Q-24 CERDIP (Derate
12.5 mW/°C above 70°C)
Thermal Impedance, θJA
N-14 PDIP 140°C/W
N-16 PDIP 135°C/W
N-20 PDIP 125°C/W
N-24-1 PDIP 120°C/W
R-16 SOIC 105°C/W
R-24 SOIC 85°C/W
R-28 SOIC 80°C/W
RS-28 SSOP 100°C/W
Q-14 CERDIP 105°C/W
Q-16 CERDIP 100°C/W
Q-24 CERDIP 55°C/W
Operating Temperature Range
Commercial (J Version) 0°C to 70°C
Industrial (A Version) −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Lead Temperature, Soldering 300°C
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220° C
720 mW
800 mW
1000 mW
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of
time may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. C | Page 4 of 20
ADM231L–ADM234L/ADM236L–ADM241L
T
T
T
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PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
14
C1+
1
–
C1
2
–
3
V
T2
OUT
R2
R2
OUT
T2
IN
IN
4
(Not to Scale)
5
6
7
ADM231L
TOP VIEW
V+
13
V
CC
12
GND
11
T1
OUT
10
R1
IN
9
R1
OUT
8
T1
IN
Figure 2. ADM231L PDIP Pin Configuration
C1+
1
C1–
2
3
V–
T2
OUT
R2
R2
OUT
T2
NC
ADM231L
4
5
(Not to Scale)
IN
6
7
IN
8
NC = NO CONNECT
TOP VIEW
16
V+
V
15
CC
14
GND
T1
13
OUT
R1
12
IN
R1
11
OUT
T1
10
IN
9
NC
Figure 3. ADM231L SOIC Pin Configuration
00070-0-004
00070-0-037
T2
1
IN
T1
2
IN
R1
3
OUT
R1
4
IN
5
6
7
8
9
10
ADM233L
TOP VIEW
(Not to Scale)
T1
OUT
GND C2+
V
CC
C1+
GND
C2–
R2
20
OUT
R2
19
IN
T2
18
OUT
V–
17
C2–
16
15
V+
14
C1–
13
V–
12
C2+
11
00070-0-008
Figure 5. ADM233L PDIP Pin Configuration
1
OUT
2
OUT
T2
T1
GND
V
C1+
CC
V+
IN
IN
1
2
3
4
5
(Not to Scale)
6
7
8
ADM234L
TOP VIEW
T3
16
OUT
T4
15
OUT
T4
14
IN
T3
13
IN
V–
12
C2–
11
C2+
10
C1–
9
00070-0-010
Figure 6. ADM234L PDIP/CERDIP/SOIC Pin Configuration
V
16
CC
GND
15
T1
14
OUT
R1
13
IN
R1
12
OUT
T1
11
IN
10
T2
IN
R2
9
OUT
00070-0-006
2
R2
C1+
C1–
C2+
C2–
OUT
1
V+
2
3
ADM232L
4
TOP VIEW
5
(Not to Scale)
V–
6
7
8
IN
Figure 4. ADM232L PDIP/CERDIP/SOIC Pin Configuration
Rev. C | Page 5 of 20
T3
T1
T2
R1
OUT
OUT
OUT
R1
OUT
T2
T1
GND
V
C1+
V+
C1–
IN
IN
IN
CC
1
2
3
4
5
6
7
8
9
10
11
12
ADM236L
TOP VIEW
(Not to Scale)
T4
24
OUT
R2
23
IN
R2
22
OUT
SD
21
20
EN
T4
19
IN
T3
18
IN
R3
17
OUT
R3
16
IN
V–
15
C–
14
C2+
13
00070-0-014
Figure 7. ADM236L PDIP/SOIC Pin Configuration
ADM231L–ADM234L/ADM236L–ADM241L
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R1
T3
T1
T2
OUT
OUT
OUT
R1
OUT
T2
T1
GND
V
C1–
IN
IN
CC
V+
IN
1
2
3
4
5
6
7
8
9
10
11
12
ADM237L
TOP VIEW
(Not to Scale)
T4
24
OUT
R2
23
IN
R2
22
OUT
T5
21
IN
T5
20
OUT
T4
19
IN
T3
18
IN
R3
17
OUT
R3
16
IN
V–C1+
15
C2–
14
C2+
13
00070-0-016
Figure 8. ADM237L PDIP/CERDIP/SOIC Pin Configuration
T2
1
OUT
T1
2
OUT
R2
3
IN
R2
4
OUT
T1
5
IN
R1
OUT
R1
GND
V
CC
IN
6
7
(Not to Scale)
8
9
ADM238L
TOP VIEW
10
V+
11
C1– C2+
12
T3
24
OUT
R3
23
IN
R3
22
OUT
T4
21
IN
T4
20
OUT
T3
19
IN
T2
18
IN
R4
17
OUT
R4
16
IN
V–C1+
15
C2–
14
13
00070-0-018
Figure 9. ADM238L PDIP/CERDIP/SOIC Pin Configuration
R1
1
OUT
R1
2
IN
3
GND
V
4
CC
V+
5
IN
IN
6
7
8
9
10
11
12
ADM239L
TOP VIEW
(Not to Scale)
C+
C–
V–
R5
R5
OUT
R4
OUT
R4
T1
24
IN
T2
23
IN
R2
22
OUT
R2
21
IN
20
T2
OUT
T1
19
OUT
R3
18
IN
R3
17
OUT
T3
16
IN
NC
15
14
EN
T3
13
OUT
00070-0-020
Figure 10. ADM239L PDIP/CERDIP/SOIC Pin Configuration
T3
1
OUT
T1
2
OUT
T2
3
OUT
R2
4
R2
5
OUT
T2
6
IN
T1
7
ADM241L
IN
R1
OUT
R1
IN
GND
V
CC
C1+
V+
C1–
8
9
10
11
12
13
14
TOP VIEW
(Not to Scale)
T4
28
OUT
R3
27
IN
R3
26
OUT
25
SD
OUT
24
EN
R4
23
IN
R4
22
OUT
T4
21
IN
T3
20
IN
R5
19
OUT
R5
18
IN
V–
17
16
C2–
15
C2+
00070-0-022
Figure 11. ADM241L SOIC/SSOP Pin Configuration
Rev. C | Page 6 of 20
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