High Speed, 5 V, 0.1 µF
CMOS RS-232 Driver/Receiver
Data Sheet
ADM202
Rev. B Document Feedback
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FEATURES
120 kB transmission rate
Small (0.1 µF) charge pump capacitors
Single 5 V power supply
Meets TIA/EIA-232-E and V.28 specifications
2 drivers and 2 receivers
On-board dc-to-dc converters
±9 V output swing with 5 V supply
Low power BiCMOS: 2.5 mA ICC
±30 V receiver input levels
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
TYPICAL APPLICATION CIRCUIT
+
ADM202
0.1µF
6.3V
0.1µF
6.3V
0.1µF
6.3V
0.1µF
16V 0.1µF
16V
C1+
C1–
C2–
C2+
T1IN T1
T2IN
R1IN
R2IN
T1OUT
T2OUT
T2
TTL/CMOS
INPUTS1RS-232
OUTPUTS
R1OUT R1
R2OUT
TTL/CMOS
OUTPUTS RS-232
INPUTS2
R2
V–
+10V T O –10V
VOLTAGE
INVERTER
5V INP UT
V+
VCC
+5V T O +10V
VOLTAGE
DOUBLER
GND
1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
+
++
+
1
3
4
5
11
10
12
9
16
2
6
14
7
13
15
8
00065-001
Figure 1.
GENERAL DESCRIPTION
The ADM202 is a 2-channel RS-232 line driver/receiver pair
designed to operate from a single 5 V power supply. 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.
This converter generates ±10 V RS-232 output levels.
The ADM202 meets or exceeds the TIA/EIA-232-E a n d V. 2 8
specifications. Fast driver slew rates permit 120 kB operation,
and high drive currents allow extended cable lengths.
An epitaxial BiCMOS construction minimizes power consump-
tion to 10 mW and 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 a 16-lead PDIP and both narrow
and wide 16-lead SOIC packages.
ADM202 Data Sheet
Rev. B | Page 2 of 10
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Application Circuit ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................7
Applications Information .................................................................8
Charge Pump DC-to-DC Voltage Converter ............................8
TTL/CMOS to RS-232 Transmitters (Drivers) .........................8
RS-232 to TTL/CMOS Receivers ................................................8
Outline Dimensions ..........................................................................9
Ordering Guide .......................................................................... 10
REVISION HISTORY
8/2016—Rev. A to Rev. B
Updated Format .................................................................. Universal
Deleted ADM203 ................................................................ Universal
Changes to Typical Application Circuit Section Heading........... 1
Deleted ADM203 Functional Block Diagram Figure;
Renumbered Sequentially ................................................................ 1
Changes to Features Section and General Description Section . 1
Deleted ADM203 Pin Configuration Figure and Figure 1 ......... 3
Changed TIN to TxIN....................................................... Throughout
Changes to Table 2 ............................................................................. 4
Changes to Table 3 ............................................................................. 5
Changes to Theory of Operation Section....................................... 7
Changes to TTL/CMOS to RS-232 Transmitters (Drivers)
Section and RS-232 to TLL/CMOS Receivers Section ................. 8
Updated Outline Dimensions .......................................................... 9
Changes to Ordering Guide .......................................................... 10
1/2001—Rev. 0 to Rev. A
Data Sheet ADM202
Rev. B | Page 3 of 10
SPECIFICATIONS
VCC = 5 V ± 10%, (C1 to C4 = 0.1 µF). All specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
OUTPUT VOLTAGE SWING ±5 ±9 V V
CC
= 5 V ± 5%; T1
OUT
and T2
OUT
loaded with 3 kΩ to GND
±5 ±9 V V
CC
= 5 V ± 10%; T
A
= 25°C; T1
OUT
and T2
OUT
loaded with 3 kΩ to GND
V
CC
POWER SUPPLY CURRENT (I
CC
) 2.5 6.0 mA No load; T1
IN
and T2
IN
= V
CC
, or T1
IN
and T2
IN
= GND
INPUT LOGIC THRESHOLD
Low, V
INL
0.8 V Tx
IN
High, VINH
2.4
V
TxIN
LOGIC PULL-UP CURRENT 12 25 µA Tx
IN
= 0 V
RS-232 INPUT
Voltage Range −30 +30 V
Threshold
Low 0.8 1.2 V
High 1.6 2.4 V
Hysteresis
0.2
0.4
1.0
V
Resistance 3 5 7 kΩ T
A
= 0°C to 85°C
TTL/CMOS Output Voltage
Low, V
OL
0.4 V I
OUT
= 1.6 mA
High, V
OH
3.5 V I
OUT
= –1.0 mA
PROPAGATION DELAY 0.3 5 µs RS-232 to TTL
TRANSITION REGION SLEW RATE 8 V/µs R
L
= 3 kΩ, C
L
= 1000 pF, measured from +3 V to –3 V or –3 V to +3 V
BAUD RATE 120 kB R
L
= 3 kΩ, C
L
= 1 nF
OUTPUT
Output Resistance 300 Ω V
CC
= V+ = V– = 0 V, V
OUT
= ±2 V
RS-232 Output Short-Circuit Current ±10 ±60 mA
ADM202 Data Sheet
Rev. B | Page 4 of 10
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
V
CC
6 V
V+ (V
CC
− 0.3 V) to +14 V
V– +0.3 V to −14 V
Input Voltages
T1
IN
, T2
IN
−0.3 V to (V
CC
+ 0.3 V)
R1
IN
, R2
IN
±30 V
Output Voltages
T1
OUT
, T2
OUT
((V+) + 0.3 V) to ((V−) − 0.3 V)
R1
OUT
, R2
OUT
–0.3 V to (V
CC
+ 0.3 V)
Short-Circuit Duration
T1
OUT
, T2
OUT
Continuous
Power Dissipation
16-Lead PDIP (N-16) 470 mW
16-Lead SOIC (R-16) 600 mW
16-Lead SOIC (RW-16) 500 mW
Thermal Impedance, θ
JA
16-Lead PDIP (N-16) 135°C/W
16-Lead SOIC (R-16) 105°C/W
16-Lead SOIC (RW-16) 105°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
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
ESD CAUTION
Data Sheet ADM202
Rev. B | Page 5 of 10
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
V+
C1–
C2+
V
CC
GND
T1
OUT
R1
IN
C2– R1
OUT
V– T1
IN
T2
OUT
T2
IN
R2
IN
R2
OUT
1
2
3
4
16
15
14
13
5
6
7
12
11
10
89
ADM202
TOP VIEW
(No t t o Scale)
C1+
00065-002
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1 C1+ External Positive Capacitor 1 Connection. The positive terminal is connected to this pin.
2 V+ Internally Generated Positive Supply (+10 V nominal).
3 C1− External Negative Capacitor 1 Connection. The negative terminal is connected to this pin.
4 C2+ External Positive Capacitor 2 Connection. The positive terminal is connected to this pin.
5 C2− External Negative Capacitor 1 Connection. The negative terminal is connected to this pin.
6 V− Internally Generated Negative Supply (−10 V Nominal).
7, 14 T2
OUT
, T1
OUT
Transmitter (Driver) Outputs. These outputs are RS-232 levels (typically ±10 V).
8, 13 R2IN, R1IN 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.
9, 12 R2
OUT
, R1
OUT
Receiver Outputs. These outputs are TTL/CMOS levels.
10, 11 T2IN, T1IN Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 kΩ pull-up resistor to VCC is
connected on each input.
15 GND Ground. This pin must be connected to 0 V.
16 V
CC
Power Supply Input, 5 V ± 10%.
ADM202 Data Sheet
Rev. B | Page 6 of 10
TYPICAL PERFORMANCE CHARACTERISTICS
15
10
5
0
–5
–10
–15
0 5 10 15 20 25 30
V+, V– (V)
LOAD CURRENT (mA)
V+
V–
00065-003
Figure 3. Charge Pump V+, V− vs. Load Current
30
25
20
15
10
5
0
0 0.5k1.0k1.5k2.0k2.5k3.0k
SLEW RATE (V/µs)
CAPACITIVE LOAD (pF)
LOW-TO-HIGH SLEW RATE
HIGH-TO-LOW SLEW RATE
V
CC
= 5V
R
L
= 3kΩ
f = 10kHz
00065-004
Figure 4. Transmitter Slew Rate vs. Capacitive Load
CH1 10.0VCH1 10.0V CH2 5.00V M1.00µs CH1 –6.4V
1
2
T
LOADED SLEW RATE (1nF)
00065-005
Figure 5. Transmitter Fully Loaded Slew Rate
15
10
5
0
–5
–10
–15
4.0 4.5 5.0 5.5
Tx OUTPUT VOLTAGE (V)
V
CC
(V)
Tx OUTPUT HIGH
Tx OUTPUT HIGH LOADED
Tx OUTPUT LOW LOADED
Tx OUTPUT LOW
00065-006
Figure 6. Transmitter (Tx) Output Voltage vs. VCC
02468101214
Tx OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
Tx OUTPUT HIGH
Tx OUTPUT LOW
15
10
5
0
–5
–10
–15
00065-007
Figure 7. Transmitter (Tx) Output Voltage vs. Load Current
CH1 10.0VCH1 10.0V CH2 5.00V M1.00µs CH2 –6.4V
1
2
T
UNLOADED SLEW RATE
00065-008
Figure 8. Transmitter Unloaded Slew Rate
Data Sheet ADM202
Rev. B | Page 7 of 10
THEORY OF OPERATION
The ADM202 is an RS-232 driver/receiver designed to solve
interface problems by meeting the TIA/EIA-232E specifications
while using a single digital 5 V supply. The EIA standard
requires that transmitters deliver ±5 V minimum on the
transmission channel and that receivers can accept signal levels
down to ±3 V. The device achieves this by integrating step-up
voltage converters and level shifting transmitters and receivers
on the same chip. CMOS technology keeps the power dissipation
to an absolute minimum.
The ADM202 contains an internal voltage doubler and a voltage
inverter that generates ±10 V from the 5 V input. External
0.1 μF capacitors are required for the internal voltage converter.
ADM202 Data Sheet
Rev. B | Page 8 of 10
APPLICATIONS INFORMATION
The internal circuitry consists of three main sections, as follows:
• A charge pump dc-to-dc voltage converter
• TTL/CMOS to RS-232 transmitters
• RS-232 to TTL/CMOS receivers
CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
The charge pump voltage converter consists of an oscillator and
a switching matrix. The converter generates a ±10 V supply from
the input 5 V level in two stages, using a switched capacitor
technique as illustrated in Figure 9 and Figure 10. First, the 5 V
input supply is doubled to 10 V using Capacitor C1 as the
charge storage element. The 10 V level is then inverted to
generate −10 V using C2 as the storage element.
Capacitors C3 and C4 reduce the output ripple. Their values are
not critical and can be reduced if higher levels of ripple are
acceptable. The charge pump capacitors, C1 and C2, can also be
reduced at the expense of higher output impedance on the V+
and V− supplies.
The V+ and V− supplies can be used to power external circuitry
if the current requirements are small.
+ +
S3S1 V+ = 2VCC
S4S2
INTERNAL
OSCILLATOR
C3
C1
VCC
GND VCC
00065-009
Figure 9. Charge Pump Voltage Doubler
+ +
S3 GND
S4S2
S1
INTERNAL
OSCILLATOR
C4
C2
V+
GND V– = –(V+)
FROM
VOLTAGE
DOUBLER
00065-010
Figure 10. Charge Pump Voltage Inverter
TTL/CMOS TO RS-232 TRANSMITTERS (DRIVERS)
The drivers convert TTL/CMOS input levels into TIA/EIA-232-E
output levels. With VCC = 5 V and driving a typical TIA/EIA-232-E
load, the output voltage swing is ±9 V. Even under worst case
conditions, the drivers are guaranteed to meet the ±5 V TIA/EIA-
232-E minimum requirement.
The input threshold levels are both TTL and CMOS compatible
with the switching threshold set at VCC/4. With a nominal VCC =
5 V, the switching threshold is 1.25 V typical. Unused inputs can
be left unconnected, as an internal 400 kΩ pull-up resistor pulls
them high, forcing the outputs into a low state.
As required by the TIA/EIA-232-E standard, the slew rate is
limited to less than 30 V/µs without the need for an external
slew limiting capacitor, and the output impedance in the power-
down state is greater than 300 Ω.
RS-232 TO TTL/CMOS RECEIVERS
The receivers are inverting level shifters that accept TIA/EIA-232-E
input levels (±5 V to ±15 V) and translate them into 5 V TTL/
CMOS levels. The inputs have internal 5 kΩ pull-down resistors
to ground and are protected against overvoltages of up to ±30 V.
The guaranteed switching thresholds are 0.8 V (VINL) and 2.4 V
(VINH), which are well within the ±3 V TIA/EIA-232-E require-
ment. The low level threshold is deliberately positive because it
ensures that an unconnected input is interpreted as a low level.
The receivers have a Schmitt triggered input with a hysteresis
level of 0.5 V. This hysteresis level ensures error free reception,
both for noisy inputs and for inputs with slow transition times.
Data Sheet ADM202
Rev. B | Page 9 of 10
OUTLINE DIMENSIONS
COMPLIANT TO JEDE C S TANDARDS MS-001-BB
0.022
0.018
0.015
0.150
0.130
0.115
0.070
0.060
0.055
0.021
0.016
0.011
0.045
0.039
0.030
0.195
0.130
0.115
16
18
9
0.100
BSC
0.775
0.755
0.735
0.210
MAX
0.015
MIN
0.280
0.250
0.240
0.430
MAX
0.012
0.010
0.008
0.325
0.310
0.300
0.015
GAUGE
PLANE
03-07-2014-D
SEATING
PLANE
TOP VIEW
SIDE VIEW
END VIEW
PIN 1
INDICATOR
Figure 11. 16-Lead Plastic Dual In-Line Package [PDIP]
Narrow Body
(N-16)
Dimensions shown in inches
CONTROLLING DIMENSIONS ARE IN M ILL IMET E RS ; INCH DIME NS IONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REF ERE NCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDE C S TANDARDS MS-012-AC
10.00 ( 0.3937)
9.80 ( 0.3858)
16 9
8
16.20 ( 0.2441)
5.80 ( 0.2283)
4.00 ( 0.1575)
3.80 ( 0. 1496)
1.27 ( 0.0500)
BSC
SEATING
PLANE
0.25 ( 0.0098)
0.10 ( 0. 0039)
0.51 ( 0.0201)
0.31 ( 0.0122)
1.75 ( 0.0689)
1.35 ( 0.0531)
0.50 ( 0.0197)
0.25 ( 0.0098)
1.27 ( 0.0500)
0.40 ( 0.0157)
0.25 ( 0.0098)
0.17 ( 0.0067)
COPLANARITY
0.10
8°
0°
060606-A
45°
Figure 12. 16-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-16)
Dimensions shown in millimeters and (inches)
ADM202 Data Sheet
Rev. B | Page 10 of 10
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-013-AA
10.50 (0.4134)
10.10 (0.3976)
0.30 (0.0118)
0.10 (0.0039)
2.65 (0.1043)
2.35 (0.0925)
10.65 (0.4193)
10.00 (0.3937)
7.60 (0.2992)
7.40 (0.2913)
0.75(0.0295)
0.25(0.0098)
45°
1.27 (0.0500)
0.40 (0.0157)
COPLANARITY
0.100.33 (0.0130)
0.20 (0.0079)
0.51 (0.0201)
0.31 (0.0122)
SEATING
PLANE
8°
0°
16 9
8
1
1.27 (0.0500)
BSC
03-27-2007-B
Figure 13. 16-Lead Standard Small Outline Package [SOIC_W]
Wide Body
(RW-16)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model1 Temperature Range Package Description Package Option
ADM202JNZ 0°C to 70°C 16-Lead Plastic Dual In-Line Package [PDIP] N-16
ADM202JRN 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ADM202JRN-REEL 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ADM202JRN-REEL7 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ADM202JRNZ 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ADM202JRNZ-REEL 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ADM202JRNZ-REEL7 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ADM202JRWZ 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_W] RW-16
ADM202JRWZ-REEL 0°C to 70°C 16-Lead Standard Small Outline Package [SOIC_W] RW-16
1 Z = RoHS Compliant Part.
©2016 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D00065-0-8/16(B)
