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FEATURES
120 kB Transmission Rate
ADM202: Small (0.1 F) Charge Pump Capacitors
ADM203: No External Capacitors Required
Single 5 V Power Supply
Meets EIA-232-E and V.28 Specifications
Two Drivers and Two Receivers
On-Board DC-DC Converters
9 V Output Swing with 5 V Supply
Low Power BiCMOS: 2.0 mA I
CC
30 V Receiver Input Levels
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
High-Speed, 5 V, 0.1 F
CMOS RS-232 Driver/Receivers
ADM202/ADM203
FUNCTIONAL BLOCK DIAGRAMS
5V INPUT
C1+
C1–
C2+
C2–
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO –10V
VOLTAGE
INVERTER
V
CC
V+
0.1 F
6.3V
0.1 F
6.3V
0.1 F
6.3V
0.1 F
16V
V–
0.1 F
16V
T1
OUT
RS-232
OUTPUTS
T2
OUT
R1
IN
RS-232
INPUTS**
R2
IN
T1
IN
TTL/CMOS
INPUTS*
T2
IN
R1
OUT
TTL/CMOS
OUTPUTS
R2
OUT
GND
T1
T2
R1
R2
ADM202
GENERAL DESCRIPTION
*INTERNAL
400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
**INTERNAL
5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
5V INPUT
The ADM202/ADM203 is a two-channel RS-232 line driver/
receiver pair designed to operate from a single 5 V power sup-
ply. A highly efficient on-chip charge pump design permits
RS-232 levels to be developed using charge pump capacitors as
small as 0.1
µF.
The capacitors are internal to the package on
the ADM203 so no external capacitors are required. These
converters generate
±
10 V RS-232 output levels.
The ADM202/ADM203 meets or exceeds the EIA-232-E and
V.28 specifications. Fast driver slew rates permit operation up to
120 kB while high-drive currents allow for extended cable lengths.
An epitaxial BiCMOS construction minimizes power consump-
tion to 10 mW and also guards against latch-up. Overvoltage
protection is provided allowing the receiver inputs to withstand
continuous voltages in excess of
±
30 V. In addition, all pins
contain ESD protection to levels greater than 2 kV.
The ADM202 is available in 16-lead DIP and both narrow and
wide SOIC packages. The ADM203 is available in a 20-lead
DIP package.
V
CC
T1
IN
TTL/CMOS
INPUTS*
T2
IN
R1
OUT
TTL/CMOS
OUTPUTS
R2
OUT
DO NOT MAKE
CONNECTIONS
TO THESE PINS
INTERNAL
–10V POWER
SUPPLY
INTERNAL
+10V POWER
SUPPLY
C1+
C2+
C1–
C2+
V–
C2–
V–
V+
R2
R2
IN
T2
T2
OUT
R1
IN
RS-232
INPUTS**
T1
T1
OUT
RS-232
OUTPUTS
R1
ADM203
C2–
GND
GND
*INTERNAL
400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
**INTERNAL
5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
ADM202/ADM203–SPECIFICATIONS
Parameter
Output Voltage Swing
Output Voltage Swing
V
CC
Power Supply Current
Input Logic Threshold Low, V
INL
Input Logic Threshold High, V
INH
Logic Pull-Up Current
RS-232 Input Voltage Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
RS-232 Input Resistance
TTL/CMOS Output Voltage Low, V
OL
TTL/CMOS Output Voltage High, V
OH
Propagation Delay
Transition Region Slew Rate
Baud Rate
Output Resistance
RS-232 Output Short Circuit Current
Specifications subject to change without notice.
(V
CC
= 5 V 10%, (ADM202 C1–C4 = 0.1 F). All Specifications
T
MIN
to T
MAX
, unless otherwise noted)
Unit
V
V
Conditions/Comments
V
CC
= 5 V
±
5%, T1
OUT
, T2
OUT
Loaded with
3 kΩ to GND
V
CC
= 5 V
±
10%, T
A
= 25°C, T1
OUT
, T2
OUT
Loaded with 3 kΩ to GND
No Load, T1
IN
, T2
IN
= V
CC
or T1
IN
,
T2
IN
= GND
T
IN
T
IN
T
IN
= 0 V
Min
±
5
±
5
Typ
±
9
±
9
2.5
Max
6.0
0.8
mA
V
V
µA
V
V
V
V
kΩ
V
V
µs
V/µs
kB
Ω
mA
2.4
12
–30
0.8
0.2
3
3.5
0.3
8
120
300
±
10
±
60
5
1.2
1.6
0.4
5
25
+30
2.4
1.0
7
0.4
T
A
= 0°C to 85°C
I
OUT
= 1.6 mA
I
OUT
= –1.0 mA
RS-232 to TTL
R
L
= 3 kΩ, C
L
= 1000 pF
Measured from +3 V to –3 V or –3 V to +3 V
R
L
= 3 kΩ, C
L
= 1 nF
V
CC
= V+ = V– = 0 V, V
OUT
=
±
2 V
ABSOLUTE MAXIMUM RATINGS*
(T
A
= 25°C unless otherwise noted)
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V
CC
– 0.3 V) to +14 V
V– . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –14 V
Input Voltages
T
IN
. . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (V
CC
+ 0.3 V)
R
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
30 V
Output Voltages
T
OUT
. . . . . . . . . . . . . . . . . . . (V+, +0.3 V) to (V–, – 0.3 V)
R
OUT
. . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (V
CC
+ 0.3 V)
Short Circuit Duration
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Power Dissipation
N-16 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470 mW
R-16N SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mW
R-16W SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 mW
N-20 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 890 mW
Thermal Impedance
N-16 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135°C/W
R-16N SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105°C/W
R-16W SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105°C/W
N-20 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C/W
Operating Temperature Range
Commercial (J Version) . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >2000 V
*This
is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this specifica-
tion is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
ORDERING GUIDE
Model
ADM202JN
ADM202JRN
ADM202JRW
ADM203JN
Temperature Range
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
Package Option
N-16
R-16N
R-16W
N-20
–2–
REV. A
ADM202/ADM203
PIN CONFIGURATIONS
DIP/SOIC
C1+
1
V+
2
C1–
3
C2+
4
16
V
CC
15
GND
14
T1
OUT
DIP
T2
IN
1
20
R2
OUT
19
R2
IN
18
T2
OUT
17
V–
T1
IN 2
R1
OUT 3
R1
IN 4
T1
OUT 5
ADM202
13
R1
IN
TOP VIEW
C2–
5
(Not to Scale)
12
R1
OUT
11
T1
IN
V–
6
10
T2
IN
9
ADM203
16
C2–
T2
OUT 7
R2
IN 8
TOP VIEW
15
C2+
GND
6
(Not to Scale)
V
CC 7
14
V+
C1+
8
GND
9
C2–
10
13
C1–
12
V–
11
C2+
R2
OUT
PIN FUNCTION DESCRIPTION
Mnemonic
V
CC
V+
V–
GND
C1+
C1–
C2+
C2–
T
IN
T
OUT
R
IN
R
OUT
Function
Power Supply Input 5 V
±
10%.
Internally Generated Positive Supply (+10 V nominal).
Internally Generated Negative Supply (–10 V nominal).
Ground Pin. Must be connected to 0 V.
ADM202 External Capacitor, (+ terminal) is connected to this pin.
ADM203: The capacitor is connected internally and no external capacitor is required.
ADM202 External Capacitor, (– terminal) is connected to this pin.
ADM203: The capacitor is connected internally and no external capacitor is required.
ADM202 External Capacitor, (+ terminal) is connected to this pin.
ADM203: The capacitor is connected internally and no external capacitor is required.
ADM202 External Capacitor, (– terminal) is connected to this pin.
ADM203: The capacitor is connected internally and no external capacitor is required.
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 kΩ pull-up resistor to V
CC
is
connected on each input.
Transmitter (Driver) Outputs. These are RS-232 levels (typically
±
10 V).
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is
connected on each of these inputs.
Receiver Outputs. These are TTL/CMOS levels.
5V INPUT
5V INPUT
V
CC
T1
IN
TTL/CMOS
INPUTS*
T2
IN
0.1 F
16V
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
V–
0.1 F
16V
T1
OUT
RS-232
OUTPUTS
T2
IN
T2
T2
OUT
R1
IN
RS-232
INPUTS**
R2
IN
INTERNAL
–10V POWER
SUPPLY
INTERNAL
+10V POWER
SUPPLY
TTL/CMOS
OUTPUTS
R2
OUT
DO NOT MAKE
CONNECTIONS
TO THESE PINS
C1+
C2+
C1–
C2+
V–
C2–
V–
V+
R2
R2
IN
R1
OUT
T2
T2
OUT
R1
IN
RS-232
INPUTS**
T1
T1
OUT
RS-232
OUTPUTS
0.1 F
6.3V
C1+
C1–
+5V TO +10V
VOLTAGE
DOUBLER
V
CC
V+
0.1 F
6.3V
0.1 F
6.3V
R1
T1
IN
TTL/CMOS
INPUTS*
T1
R1
OUT
TTL/CMOS
OUTPUTS
R2
OUT
GND
R1
R2
ADM203
C2–
GND
GND
ADM202
*INTERNAL
400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
**INTERNAL
5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
*INTERNAL
400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
**INTERNAL
5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 1. Typical Operating Circuits
REV. A
–3–
ADM202/ADM203 –Typical Performance Characteristics
15
15
Tx O/P HI
10
V+
5
Tx O/P – V
V+, V– – V
10
5
Tx O/P HI LOADED
0
0
–5
V–
–10
–5
Tx O/P LO LOADED
–10
Tx O/P LO
–15
0
5
15
20
10
LOAD CURRENT – mA
25
30
–15
4.0
4.5
V
CC
– V
5.0
5.5
TPC 1. Charge Pump V+, V– vs. Current
TPC 4. Transmitter Output Voltage vs. V
CC
30
V
CC
= 5V
R
L
= 3k
f = 10kHz
15
25
10
Tx O/P HI
Tx O/P VOLTAGE – V
5
SLEW RATE – V/ s
20
15
LOW-TO-HIGH SLEW RATE
10
HIGH-TO-LOW SLEW RATE
5
0
–5
Tx O/P LO
–10
0
0
500
2k
1k
1.5k
CAPACITIVE LOAD – pF
2.5k
3k
–15
0
2
4
6
8
10
LOAD CURRENT – mA
12
14
TPC 2. Transmitter Slew Rate vs. Load Capacitance
TPC 5. Transmitter Output Voltage vs. Current
1
T
1
T
2
T
2
T
CH1 10.0V
CH2
5.00V M 1.00 s CH2
–6.4V
CH1 10.0V
CH2
5.00V M 1.00 s CH2
UNLOADED SLEW RATE
–6.4V
LOADED SLEW RATE – 1nF
TPC 3. Transmitter Fully Loaded Slew Rate
TPC 6. Transmitter Unloaded Slew Rate
–4–
REV. A
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