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0.1 μF, 5 V Powered CMOS  
RS-232 Drivers/Receivers  
ADM206/ADM207/ADM208/ADM211/ADM213  
FEATURES  
TYPICAL OPERATING CIRCUIT  
5V INPUT  
0.1 μF to 10 μF capacitors  
120 kB/s data rate  
12  
14  
V
CC  
C1+  
C1–  
+5VTO +10V  
VOLTAGE  
DOUBLER  
11  
13  
+
+
+
0.1  
16V  
μF  
0.1μF  
0.1μF  
+
+
Two receivers active in shutdown (ADM213)  
On-board dc-to-dc converters  
9 V output swing with 5 V supply  
Low power (15 mW)  
6.3V  
V+  
V–  
+10VTO –10V  
VOLTAGE  
INVERTER  
15 C2+  
17  
0.1μF  
16V  
0.1  
16V  
μF  
16  
C2–  
Low power shutdown ≤ 5 μW  
30 V receiver input levels  
Latch-up free  
T1  
T1  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
R5  
2
3
T1  
7
6
IN  
IN  
IN  
IN  
OUT  
OUT  
OUT  
OUT  
IN  
T2  
T3  
T4  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
R5  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
1
Pin compatible to MAX206-211/213  
20  
21  
8
1
28  
9
APPLICATIONS  
Computers  
Peripherals  
Modems  
Printers  
Instruments  
R1  
R2  
R3  
R4  
R5  
OUT  
OUT  
4
5
IN  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
27  
23  
26  
22  
19  
24  
OUT  
OUT  
OUT  
EN  
IN  
IN  
IN  
2
18  
25  
SD  
ADM211  
GND  
10  
NOTES  
1
INTERNAL 400k  
Ω PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
2
INTERNAL 5k  
Ω
PULL-DOWN RESIST OR ON EACH RS-232 INPUT.  
Figure 1.  
GENERAL DESCRIPTION  
The ADM2xx family of line drivers/receivers is intended for all  
EIA-232-E and V.28 communications interfaces, especially in  
applications where ±±2 V is not available. The ADM206,  
ADM2±±, and ADM2±3 feature a low power shutdown mode  
that reduces power dissipation to less than 5 μW, making them  
ideally suited for battery-powered equipment. The ADM2±3 has  
an active low shutdown and an active high receiver-enable  
control. Two receivers of the ADM2±3 remain active during  
shutdown. This feature is useful for ring indicator monitoring.  
All members of the ADM2xx family 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 ±±0 V  
required for RS-232 output levels.  
Table 1. Selection Table  
TTL Three-  
Part  
Number  
Power Supply  
Voltage  
Number of RS-  
232 Drivers  
Number of  
RS-232 Receivers Capacitors  
External  
Low Power  
Shutdown (SD)  
Number of Receivers  
Active in Shutdown  
EN  
State  
Yes  
No  
ADM206  
ADM207  
ADM208  
ADM211  
ADM213  
5 V  
5 V  
5 V  
5 V  
5 V  
4
5
4
4
4
3
3
4
5
5
4
4
4
4
4
Yes  
No  
No  
Yes  
0
0
0
0
2
No  
Yes  
SD  
Yes (EN)  
Yes (  
)
Rev. D  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2011 Analog Devices, Inc. All rights reserved.  
 
 
 
ADM206/ADM207/ADM208/ADM211/ADM213  
TABLE OF CONTENTS  
Features .............................................................................................. 1  
Pin Configurations and Function Descriptions............................5  
Typical Performance Characteristics ..............................................9  
General Information ...................................................................... 11  
Circuit Description .................................................................... 11  
Application Hints ....................................................................... 12  
Outline Dimensions....................................................................... 13  
Ordering Guide .......................................................................... 16  
Applications....................................................................................... 1  
Typical Operating Circuit................................................................ 1  
General Description......................................................................... 1  
Revision History ............................................................................... 2  
Specifications..................................................................................... 3  
Absolute Maximum Ratings............................................................ 4  
ESD Caution.................................................................................. 4  
REVISION HISTORY  
5/11—Data Sheet Changed from Rev. C to Rev. D  
Deleted ADM209................................................................Universal  
Changes to Figure 5.......................................................................... 5  
Updated Outline Dimensions....................................................... 13  
Changes to Ordering Guide .......................................................... 15  
1/05—Data Sheet Changed from Rev. B to Rev. C  
Changes to Specifications................................................................ 3  
Change to Receivers section.......................................................... 11  
Change to Driving Long Cables section...................................... 12  
Updated Outline Dimensions....................................................... 13  
Changes to Ordering Guide .......................................................... 15  
6/02—Data Sheet Changed from Rev. A to Rev. B  
Removed all references to ADM205 ................................Universal  
3/02—Data Sheet Changed from Rev. 0 to Rev. A  
Changes to numbers in Min/Typ/Max column of  
Specifications page ........................................................................... 2  
Updated Figures............................................................................ 8, 9  
Revision 0: Initial Version  
Rev. D | Page 2 of 16  
 
ADM206/ADM207/ADM208/ADM211/ADM213  
SPECIFICATIONS  
VCC = 5 V ± ±0% (ADM206, ADM207, ADM208, ADM2±±, ADM2±3); C±–C4 = 0.± μF ceramic. All specifications TMIN to TMAX, unless  
otherwise noted.  
Table 2.  
Parameter  
Min Typ  
Max Unit Test Conditions/Comments  
Output Voltage Swing  
±5  
±±  
5
1
V
All transmitter outputs loaded with 3 kΩ to ground  
No load  
VCC Power Supply Current  
Shutdown Supply Current  
Input Logic Threshold Low, VINL  
Input Logic Threshold High, VINH  
Logic Pull-Up Current  
RS-232 Input Voltage Range1  
RS-232 Input Threshold Low  
RS-232 Input Threshold High  
RS-232 Input Hysteresis  
13  
10  
0.8  
mA  
μA  
V
TIN, EN, SD, EN, SD  
TIN, EN, SD, EN, SD  
TIN = 0 V  
2.0  
V
10  
25  
+30  
μA  
V
V
V
V
kΩ  
V
V
–30  
0.8  
1.25  
1.±  
0.65  
5
2.4  
RS-232 Input Resistance  
3
7
0.4  
TA = 0°C to 85°C  
IOUT = 1.6 mA  
IOUT = –1.0 mA  
EN = VCC, EN = 0 V, 0 V ≤ ROUT ≤ VCC  
ADM206, ADM211 (Figure 22. CL = 150 pF)  
ADM206, ADM211 (Figure 22. RL = 1 kΩ)  
RS-232 to TTL  
TTL/CMOS Output Voltage Low, VOL  
TTL/CMOS Output Voltage High, VOH  
TTL/CMOS Output Leakage Current  
Output Enable Time (TEN)  
Output Disable Time (TDIS  
Propagation Delay  
3.5  
0.05 ±10  
115  
165  
0.5  
8
μA  
ns  
ns  
μs  
)
5
Transition Region Slew Rate  
Output Resistance  
V/μs RL = 3 kΩ, CL = 2500 pF; measured from +3 V to –3 V or –3 V to +3 V  
Ω
300  
VCC = V+ = V– = 0 V, VOUT= ± 2 V  
RS-232 Output Short Circuit Current  
±12  
±60  
mA  
1 Guaranteed by design.  
Rev. D | Page 3 of 16  
 
 
ADM206/ADM207/ADM208/ADM211/ADM213  
ABSOLUTE MAXIMUM RATINGS  
TA = 25°C, unless otherwise noted.  
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.  
Table 3.  
Parameter  
Min  
VCC  
V+  
V–  
–0.3 V to +6 V  
(VCC – 0.3 V) to +14 V  
+0.3 V to –14 V  
Input Voltages  
TIN  
RIN  
–0.3 V to (VCC + 0.3 V)  
±30 V  
Output Voltages  
TOUT  
ROUT  
ESD CAUTION  
(V+, +0.3 V) to (V–, –0.3 V)  
–0.3 V to (VCC + 0.3 V)  
Short-Circuit Duration  
TOUT  
Continuous  
Power Dissipation  
N-24 PDIP (Derate 13.5 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-24 SSOP (Derate 12 mW/°C  
above 70°C)  
1000 mW  
850 mW  
±00 mW  
850 mW  
±00 mW  
RS-28 SSOP (Derate 10 mW/°C  
above 70°C)  
Thermal Impedance, θJA  
N-24 PDIP  
R-24 SOIC  
R-28 SOIC  
RS-24 SSOP  
120°C/W  
85°C/W  
80°C/W  
115°C/W  
100°C/W  
RS-28 SSOP  
Operating Temperature Range  
Industrial (A Version)  
Storage Temperature Range  
Lead Temperature, Soldering  
Vapor Phase (60 s)  
Infrared (15 s)  
–40°C to +85°C  
–65°C to +150°C  
300°C  
215°C  
220°  
Rev. D | Page 4 of 16  
 
 
ADM206/ADM207/ADM208/ADM211/ADM213  
PIN CONFIGURATION4 AND FUNCTION DESCRIPTIONS  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
T3  
T1  
T2  
T4  
OUT  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
T3  
T1  
T2  
T4  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
R2  
R2  
R2  
R2  
T5  
IN  
IN  
3
3
OUT  
OUT  
4
4
R1  
SD  
R1  
IN  
IN  
IN  
5
5
R1  
EN  
T4  
R1  
T5  
T4  
T3  
OUT  
OUT  
OUT  
ADM206  
TOP VIEW  
(Not to Scale)  
ADM207  
TOP VIEW  
(Not to Scale)  
6
T2  
T1  
6
T2  
T1  
IN  
IN  
IN  
IN  
IN  
IN  
7
7
T3  
IN  
IN  
8
GND  
R3  
R3  
V–  
8
GND  
R3  
OUT  
IN  
OUT  
IN  
9
V
V
9
16 R3  
CC  
CC  
10  
11  
12  
C1+  
V+  
10  
11  
12  
15  
14  
13  
C1+  
V+  
V–  
C2–  
C2+  
C2–  
C2+  
C1–  
C1–  
Figure 2. ADM206 PDIP/SOIC/SSOP Pin Configuration  
Figure 4. ADM207 PDIP/SOIC/SSOP Pin Configuration  
5V INPUT  
10  
12  
V
CC  
+5VTO +10V  
VOLTAGE  
DOUBLER  
9
C1+  
C1–  
5V INPUT  
+
+
+
0.1μF  
0.1μF  
0.1μF  
+
+
6.3V  
11  
6.3V  
V+  
V–  
V
10  
12  
C1+  
C1–  
+5VTO +10V  
VOLTAGE  
DOUBLER  
9
+
+
CC  
+
0.1μF  
0.1μF  
0.1μF  
+
+
+10V TO –10V  
VOLTAGE  
INVERTER  
13 C2+  
15  
6.3V  
6.3V  
V+ 11  
0.1μF  
16V  
0.1μF  
16V  
14  
C2–  
+10VTO –10V  
VOLTAGE  
INVERTER  
13  
C2+  
V–  
15  
0.1μF  
16V  
0.1μF  
16V  
14 C2–  
2
3
T1  
IN  
T1  
T2  
T3  
T4  
T5  
R1  
R2  
T1  
7
6
OUT  
T1  
IN  
T1  
T2  
T3  
T4  
R1  
R2  
R3  
T1  
7
6
2
3
1
OUT  
T2  
IN  
T2  
OUT  
T2  
IN  
T2  
OUT  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
T3  
IN  
T3  
TTL/CMOS  
1
18  
19  
21  
5
OUT  
1
RS-232  
OUTPUTS  
1
INPUTS  
T3  
IN  
T3  
18  
OUT  
T4  
IN  
T4  
24  
20  
4
OUT  
T4  
IN  
T4  
24  
4
19  
5
OUT  
T5  
IN  
T5  
OUT  
R1  
R1  
IN  
OUT  
R1  
R1  
IN  
OUT  
OUT  
OUT  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
R2  
R3  
22  
R2  
IN  
23  
16  
OUT  
2
TTL/CMOS  
OUTPUTS  
R2  
R3  
RS-232  
INPUTS  
22  
17  
R2  
IN  
23  
16  
2
17  
20  
R3  
IN  
OUT  
R3  
R3  
IN  
21  
SD  
EN  
ADM206  
GND  
8
GND  
ADM207  
8
NOTES  
1
NOTES  
1
INTERNAL 400k  
Ω
PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
INTERNAL 400k  
Ω
PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
2
INTERNAL 5k  
Ω PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
2
INTERNAL 5k  
Ω PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
Figure 5. ADM207 Typical Operating Circuit  
Figure 3. ADM206 Typical Operating Circuit  
Rev. D | Page 5 of 16  
 
ADM206/ADM207/ADM208/ADM211/ADM213  
1
2
28 T4  
OUT  
T3  
T1  
T2  
OUT  
27  
26  
25  
24  
23  
22  
R3  
OUT  
IN  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
T2  
T1  
T3  
OUT  
3
R3  
OUT  
OUT  
OUT  
R3  
R3  
T4  
4
R2  
SD  
OUT  
IN  
IN  
3
R2  
5
R2  
EN  
R4  
IN  
OUT  
OUT  
4
6
R2  
T2  
OUT  
IN  
IN  
IN  
IN  
ADM211  
TOP VIEW  
(Not to Scale)  
5
T1  
7
R4  
T1  
T4  
T3  
T2  
OUT  
IN  
IN  
OUT  
ADM208  
TOP VIEW  
(Not to Scale)  
6
R1  
OUT  
R1  
8
21 T4  
IN  
OUT  
7
R1  
9
T3  
R1  
20  
19  
18  
17  
16  
15  
IN  
IN  
IN  
IN  
8
GND  
GND  
R4  
10  
11  
12  
13  
R5  
R5  
V–  
OUT  
IN  
OUT  
V
9
16 R4  
V
CC  
CC  
IN  
10  
11  
12  
15  
14  
13  
C1+  
V+  
V–  
C1+  
V+  
C2–  
C2+  
C2–  
C2+  
C1–  
C1– 14  
Figure 6. ADM208 PDIP/SOIC/SSOP Pin Configuration  
Figure 8. ADM211 SOIC/SSOP Pin Configuration  
5V INPUT  
V
12  
14  
C1+  
C1–  
+5VTO +10V  
VOLTAGE  
DOUBLER  
11  
13  
+
+
CC  
+
5V INPUT  
0.1  
16V  
μF  
0.1μF  
0.1μF  
+
+
6.3V  
V+  
V–  
V
9
10  
12  
C1+  
C1–  
+5VTO +10V  
VOLTAGE  
DOUBLER  
+
+
CC  
+
0.1  
6.3V  
μF  
0.1μF  
+10VTO –10V  
VOLTAGE  
INVERTER  
0.1μ  
F
C2+  
15  
17  
+
+
0.1μF  
16V  
11  
6.3V  
0.1  
16V  
μF  
V+  
V–  
16 C2–  
+10VTO –10V  
VOLTAGE  
INVERTER  
13 C2+  
14 C2–  
15  
0.1μF  
16V  
0.1  
16V  
μF  
T1  
T1  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
R5  
2
3
T1  
7
6
IN  
IN  
IN  
IN  
OUT  
OUT  
OUT  
OUT  
IN  
T2  
T3  
T4  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
R5  
T1  
T1  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
2
T1  
5
IN  
IN  
IN  
IN  
OUT  
OUT  
OUT  
OUT  
IN  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
1
T2  
T3  
T4  
1
T2  
T3  
T4  
R1  
R2  
R3  
R4  
1
28  
9
18  
19  
21  
20  
21  
8
TTL/CMOS  
RS-232  
OUTPUTS  
1
INPUTS  
24  
20  
R1  
R2  
R3  
R4  
R5  
OUT  
OUT  
OUT  
OUT  
R1  
R2  
R3  
R4  
OUT  
OUT  
OUT  
OUT  
7
3
6
4
4
5
IN  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
IN  
IN  
IN  
26  
22  
19  
24  
27  
23  
IN  
IN  
IN  
2
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
2
22  
17  
23  
16  
18  
25  
OUT  
ADM208  
GND  
8
SD  
EN  
ADM211  
GND  
10  
NOTES  
1
NOTES  
1
INTERNAL 400k  
Ω
PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
INTERNAL 400k  
Ω
PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
2
INTERNAL 5k  
Ω PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
2
INTERNAL 5k  
Ω PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
Figure 9. ADM211 Typical Operating Circuit  
Figure 7. ADM208 Typical Operating Circuit  
Rev. D | Page 6 of 16  
ADM206/ADM207/ADM208/ADM211/ADM213  
5V INPUT  
12  
14  
V
11  
13  
+5VTO +10V  
VOLTAGE  
DOUBLER  
C1+  
C1–  
+
+
CC  
+
0.1  
16V  
μF  
0.1μF  
0.1μF  
+
+
6.3V  
V+  
+10VTO –10V  
VO LTAG E  
INVERTER  
15 C2+  
V– 17  
0.1μF  
16V  
0.1  
16V  
μF  
16  
C2–  
T1  
7
6
2
3
T1  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
R5  
T1  
IN  
IN  
IN  
IN  
OUT  
OUT  
OUT  
OUT  
IN  
T2  
T3  
T4  
T2  
T3  
T4  
R1  
R2  
R3  
R4  
R5  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
1
1
28  
9
20  
21  
8
1
2
28  
T3  
T1  
T2  
T4  
OUT  
OUT  
27  
R3  
R3  
R1  
R2  
R3  
OUT  
IN  
OUT  
OUT  
3
26  
OUT  
OUT  
4
5
IN  
IN  
4
25  
R2  
SD  
EN  
IN  
5
24  
R2  
TTL/CMOS  
OUTPUTS  
OUT  
RS-232  
INPUTS  
26  
22  
19  
24  
27  
23  
OUT  
3
2
6
23  
T2  
T1  
R4  
*
IN  
IN  
IN  
ADM213  
TOP VIEW  
(Not to Scale)  
7
22  
3
R4  
T4  
*
R4  
OUT  
OUT  
IN  
R1  
8
21  
OUT  
IN  
IN  
3
3
18  
25  
R5  
OUT  
IN  
R1  
9
20 T3  
IN  
GND  
10  
11  
19  
18  
17  
16  
15  
R5  
*
OUT  
EN  
SD  
ADM213  
V
R5  
V–  
*
GND  
10  
CC  
IN  
C1+ 12  
13  
14  
V+  
C2–  
C2+  
NOTES  
1
C1–  
INTERNAL 400k  
Ω
PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
ACTIVE IN SHUTDOWN.  
2
3
INTERNAL 5k  
Ω
*ACTIVE IN SHUTDOWN  
Figure 10. ADM213 SOIC/SSOP Pin Configuration  
Figure 11. ADM213 Typical Operating Circuit  
Rev. D | Page 7 of 16  
ADM206/ADM207/ADM208/ADM211/ADM213  
Table 4. Pin Function Descriptions  
Mnemonic Function  
VCC  
Power Supply Input. 5 V ± 10ꢀ.  
V+  
V–  
Internally Generated Positive Supply (10 V nominal).  
Internally Generated Negative Supply (–10 V Nominal).  
Ground Pin. Must be connected to 0 V.  
External Capacitor (+ terminal) is connected to this pin.  
External Capacitor (– terminal) is connected to this pin.  
External Capacitor (+ terminal) is connected to this pin.  
External Capacitor (– terminal) is connected to this pin.  
GND  
C1+  
C1–  
C2+  
C2–  
TIN  
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 kΩ pull-up resistor to VCC is connected to  
each input.  
TOUT  
RIN  
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 to each  
input.  
ROUT  
Receiver Outputs. These are TTL/CMOS levels.  
EN/EN  
Enable Input. Active low on ADM206 and ADM211. Active high on ADM213. This input is used to enable/disable the receiver  
outputs. With EN = low (EN = high ADM213), the receiver outputs are enabled. With EN = high (EN = low ADM213), the  
outputs are placed in a high impedance state. This is useful for connecting to microprocessor systems.  
SD/SD  
NC  
Shutdown Input. Active high on ADM206 and ADM211. Active low on ADM213. With SD = high on the ADM206 and ADM211,  
the charge pump is disabled, the receiver outputs are placed in a high impedance state, and the driver outputs are turned off.  
With SD = low on the ADM213, the charge pump is disabled, the driver outputs are turned off, and all receivers, except R4 and  
R5, are placed in a high impedance state. In shutdown, the power consumption reduces to 5 μW.  
No Connect. No connections are required to this pin.  
Table 5. ADM206 and ADM211 Truth Table  
EN  
SD  
0
0
Status  
Transmitters T1–T5  
Enabled  
Enabled  
Receivers R1–R5  
Enabled  
Disabled  
0
1
0
Normal Operation  
Normal Operation  
Shutdown  
1
Disabled  
Disabled  
Table 6. ADM213 Truth Table  
SD  
EN  
0
1
0
1
Status  
Transmitters T1–T4  
Disabled  
Disabled  
Enabled  
Enabled  
Receivers R1–R3  
Disabled  
Disabled  
Disabled  
Enabled  
Receivers R4, R5  
Disabled  
Enabled  
Disabled  
Enabled  
0
0
1
1
Shutdown  
Shutdown  
Normal Operation  
Normal Operation  
Rev. D | Page 8 of 16  
 
 
ADM206/ADM207/ADM208/ADM211/ADM213  
TYPICAL PERFORMANCE CHARACTERISTICS  
15  
15  
10  
10  
V+  
Tx O/P HIGH  
5
5
0
0
–5  
–5  
V
–
Tx O/P LOW  
–10  
–
–
10  
15  
–15  
0
5
10  
LOAD CURRENT (mA)  
15  
20  
3000  
6.0  
0
2
4
6
8
10  
LOAD CURRENT (mA)  
Figure 12. Charge Pump V+, V– vs. Load Current  
Figure 15. Transmitter Output Voltage vs. Load Current  
350  
300  
250  
200  
150  
50  
45  
40  
35  
30  
25  
V– IMP  
NEGATIVE  
SLEW  
20  
15  
10  
5
V+ IMP  
100  
50  
POSITIVE  
SLEW  
0
0
4.5  
4.7  
4.9  
5.1  
5.3  
5.5  
0
500  
1000  
1500  
2000  
2500  
V
(V)  
LOAD CAPACITANCE (pF)  
CC  
Figure 13. Transmitter Slew Rate vs. Load Capacitance  
Figure 16. Charge Pump Impedance vs. VCC  
9
7
5
3
Tx O/P HIGH LOADED  
1
T
SD  
V+  
1
0
–1  
T
2
3
–3  
–5  
–7  
–9  
T
V–  
Tx O/P LOW LOADED  
3.1V  
V+, V– EXITING SHUTDOWN (SD)  
CH1 5.00V  
CH3 5.00V  
CH2 5.00V M50.0μs  
CH1  
W
4.0  
4.5  
5.0  
(V)  
5.5  
B
V
CC  
Figure 14. Transmitter Output Voltage vs. VCC  
Figure 17. Charge Pump, V+, V– Exiting Shutdown  
Rev. D | Page ± of 16  
 
ADM206/ADM207/ADM208/ADM211/ADM213  
Tx INPUT  
T
T
Tx INPUT  
1
2
1
T
T
2
Tx OUTPUT  
Tx OUTPUT  
800mV  
5.00V CH2 5.00V M1.00  
μs  
CH1  
5.00V CH2 5.00V M1.00μs CH1  
CH1  
CH1  
800mV  
Figure 18. Transmitter Output Loaded Slew Rate  
Figure 19. Transmitter Output Unloaded Slew Rate  
Rev. D | Page 10 of 16  
ADM206/ADM207/ADM208/ADM211/ADM213  
GENERAL INFORMATION  
S1  
S2  
S3  
S4  
V+  
The ADM2xx family of RS-232 drivers/ receivers is designed to  
solve interface problems by meeting the EIA-232-E  
GND  
FROM  
VOLTAGE  
DOUBLER  
+
+
C2  
C4  
GND  
V– = –(V+)  
specifications while using a single digital 5 V supply. The EIA-  
232-E standard requires transmitters that will deliver ±5 V  
minimum on the transmission channel and receivers that can  
accept signal levels down to ±3 V. The ADM2xx meet these  
requirements by integrating step-up voltage converters and level  
shifting transmitters and receivers onto the same chip. CMOS  
technology is used to keep the power dissipation to an absolute  
minimum. A comprehensive range of transmitter/ receiver  
combinations is available to cover most communication needs.  
The ADM2xx are modifications, enhancements, and  
INTERNAL  
OSCILLATOR  
Figure 21. Charge Pump Voltage Inverter  
Capacitors C3 and C4 are used to reduce the output ripple.  
Their values are not critical and can be reduced if higher levels  
of ripple are acceptable. The charge pump capacitors C± and C2  
may also be reduced at the expense of higher output impedance  
on the V+ and V– supplies.  
improvements to the AD2xx family and derivatives thereof. They  
are essentially plug-in compatible and do not have materially  
different applications.  
The V+ and V– supplies may also be used to power external  
circuitry if the current requirements are small.  
Transmitters (Drivers)  
The ADM206, ADM2±±, and ADM2±3 are particularly useful in  
battery-powered systems because they feature a low power shut-  
down mode that reduces power dissipation to less than 5 μW.  
The drivers convert TTL/CMOS input levels into EIA-232-E  
output levels. With VCC = +5 V and driving a typical EIA-232-E  
load, the output voltage swing is ±ꢀ V. Even under worst-case  
conditions, the drivers are guaranteed to meet the ±5 V EIA-  
232-E minimum requirement.  
To facilitate sharing a common line or for connection to a  
microprocessor data bus, the ADM206, the ADM2±±, and the  
ADM2±3 feature an enable ( ) function. When the receivers  
are disabled, their outputs are placed in a high impedance state.  
EN  
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 ±.25 V typical. Unused inputs  
may be left unconnected, because an internal 400 kΩ pull-up  
resistor pulls them high, forcing the outputs into a low state.  
=
CIRCUIT DESCRIPTION  
The internal circuitry in the ADM2xx consists of three main  
sections: (a) a charge pump voltage converter; (b) RS-232-to-  
TTL/CMOS receivers; and (c) TTL/CMOS-to-RS-232  
transmitters.  
As required by the 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-off  
state is greater than 300 Ω.  
Charge Pump DC-to-DC Voltage Converter  
The charge pump voltage converter consists of an oscillator and  
a switching matrix. The converter generates a ±±0 V supply  
from the 5 V input. This is done in two stages using a switched  
capacitor technique, as illustrated in Figure 20 and Figure 2±.  
First, the 5 V input supply is doubled to ±0 V using capacitor C±  
as the charge storage element. The ±0 V level is then inverted to  
generate –±0 V using C2 as the storage element.  
Receivers  
The receivers are inverting level shifters that accept EIA-232-E  
input levels (±5 V to ±±5 V) and translate them into 5 V TTL/  
CMOS levels. The inputs have internal 5 kΩ pull-down resistors  
to ground and are also protected against overvoltages of up to  
±30 V. The guaranteed switching thresholds are 0.8 V minimum  
and 2.4 V maximum, well within the ±3 V EIA-232-E require-  
ment. The low level threshold is deliberately positive, since it  
ensures that an unconnected input will be interpreted as a  
low level.  
S1  
S3  
V
V+ = 2V  
CC  
CC  
+
+
C1  
C3  
S2  
S4  
V
GND  
CC  
INTERNAL  
OSCILLATOR  
The receivers have Schmitt-trigger inputs with a hysteresis level  
of 0.65 V. This ensures error-free reception for both noisy  
inputs and inputs with slow transition times.  
Figure 20. Charge Pump Voltage Doubler  
Rev. D | Page 11 of 16  
 
 
 
 
ADM206/ADM207/ADM208/ADM211/ADM213  
Shutdown (SD)  
APPLICATION HINTS  
The ADM2xx feature a control input that may be used to  
disable the part and reduce the power consump-ion to less than  
5 ΩW. This is very useful in battery-operated systems. During  
shutdown, the charge pump is turned off, the transmitters are  
disabled, and all receivers except R4 and R5 on the ADM2±3 are  
put into a high impedance disabled state. Receivers R4 and R5  
on the ADM2±3 remain enabled during shutdown. This feature  
allows monitoring external activity while the device is in a low  
power shutdown mode. The shutdown control input is active  
high on all parts except the ADM2±3, where it is active low. See  
Table 5 and Table 6.  
Driving Long Cables  
In accordance with the EIA-232-E standard, long cables are  
permissible provided the total load capacitance does not exceed  
2500 pF. For longer cables that do exceed this, it is possible to  
trade off baud rate for cable length. Large load capacitances cause  
a reduction in slew rate, and therefore the maximum transmis-  
sion baud rate is decreased. The ADM2xx are designed to  
minimize the slew rate reduction that occurs as load  
capacitance increases.  
For the receivers, it is important that a high level of noise  
immunity be inbuilt so that slow rise and fall times do not cause  
multiple output transitions as the signal passes slowly through  
the transition region. The ADM2xx have 0.65 V of hysteresis to  
guard against this. This ensures that even in noisy environments  
error-free reception can be achieved.  
Enable Input  
The ADM2±± and ADM2±3 feature an enable input used to  
enable or disable the receiver outputs. The enable input is active  
low on the ADM2±± and active high on the ADM2±3. See  
Table 5 and Table 6. When the receivers are disabled, their  
outputs are placed in a high impedance state. This function  
allows the outputs to be connected directly to a microprocessor  
data bus. It can also be used to allow receivers from different  
devices to share a common data line. The timing diagram for  
the enable function is shown in Figure 22.  
High Baud Rate Operation  
The ADM2xx feature high slew rates, permitting data  
transmission at rates well in excess of the EIA-232-E  
specification. The drivers maintain ±5 V signal levels at data  
rates up to ±20 kB/s under worst-case loading conditions.  
3V  
EN*  
0V  
T
T
EN  
DIS  
V
– 0.1V  
+ 0.1V  
3.5V  
0.8V  
OH  
R
OUT  
V
OL  
*POLARITY OF EN IS REVERSED FOR ADM213.  
Figure 22. Enable Timing  
Rev. D | Page 12 of 16  
 
 
ADM206/ADM207/ADM208/ADM211/ADM213  
OUTLINE DIMENSIONS  
1.185 (30.01)  
1.165 (29.59)  
1.145 (29.08)  
0.295 (7.49)  
0.285 (7.24)  
0.275 (6.99)  
13  
24  
1
12  
0.325 (8.26)  
0.310 (7.87)  
0.300 (7.62)  
0.180  
(4.57)  
MAX  
0.015 (0.38) MIN  
0.150 (3.81)  
0.135 (3.43)  
0.120 (3.05)  
0.150 (3.81)  
0.130 (3.30)  
0.110 (2.79)  
0.015 (0.38)  
0.010 (0.25)  
0.008 (0.20)  
0.100  
(2.54)  
BSC  
SEATING  
PLANE  
0.060 (1.52)  
0.050 (1.27)  
0.045 (1.14)  
0.022 (0.56)  
0.018 (0.46)  
0.014 (0.36)  
COMPLIANT TO JEDEC STANDARDS MO-095AG  
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS  
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR  
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN  
Figure 23. 24-Lead Plastic Dual In-Line Package [PDIP]  
Narrow Body  
(N-24-1)  
Dimensions shown in inches and (millimeters)  
15.60 (0.6142)  
15.20 (0.5984)  
24  
1
13  
12  
7.60 (0.2992)  
7.40 (0.2913)  
10.65 (0.4193)  
10.00 (0.3937)  
2.65 (0.1043)  
2.35 (0.0925)  
0.75 (0.0295)  
0.25 (0.0098)  
× 45°  
0.30 (0.0118)  
0.10 (0.0039)  
8°  
0°  
1.27 (0.0500)  
BSC  
SEATING  
PLANE  
0.51 (0.020)  
0.31 (0.012)  
1.27 (0.0500)  
0.40 (0.0157)  
COPLANARITY  
0.10  
0.33 (0.0130)  
0.20 (0.0079)  
COMPLIANT TO JEDEC STANDARDS MS-013AD  
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  
Figure 24. 24-Lead Standard Small Outline Package [SOIC_W]  
Wide Body  
(RW-24)  
Dimensions shown in millimeters and (inches)  
Rev. D | Page 13 of 16  
 
ADM206/ADM207/ADM208/ADM211/ADM213  
8.50  
8.20  
7.90  
24  
13  
12  
8.20  
7.80  
7.40  
5.60  
5.30  
5.00  
1
PIN 1  
1.85  
1.75  
1.65  
COPLANARITY  
0.10  
2.00 MAX  
0.95  
0.75  
0.55  
8°  
4°  
0°  
0.38  
0.22  
0.65  
BSC  
0.25  
0.09  
0.05 MIN  
SEATING  
PLANE  
COMPLIANT TO JEDEC STANDARDS MO-150AG  
Figure 25. 24-Lead Shrink Small Outline Package [SSOP]  
(RS-24)  
Dimensions shown in millimeters  
18.10 (0.7126)  
17.70 (0.6969)  
28  
1
15  
14  
7.60 (0.2992)  
7.40 (0.2913)  
10.65 (0.4193)  
10.00 (0.3937)  
2.65 (0.1043)  
2.35 (0.0925)  
0.75 (0.0295)  
0.25 (0.0098)  
× 45°  
0.30 (0.0118)  
0.10 (0.0039)  
8°  
0°  
1.27 (0.0500)  
BSC  
SEATING  
PLANE  
0.51 (0.0201)  
0.33 (0.0130)  
1.27 (0.0500)  
0.40 (0.0157)  
0.33 (0.0130)  
0.20 (0.0079)  
COPLANARITY  
0.10  
COMPLIANT TO JEDEC STANDARDS MS-013AE  
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  
Figure 26. 28-Lead Standard Small Outline Package [SOIC_W]  
Wide Body  
(RW-28)  
Dimensions shown in millimeters and (inches)  
Rev. D | Page 14 of 16  
ADM206/ADM207/ADM208/ADM211/ADM213  
10.50  
10.20  
9.90  
28  
15  
5.60 8.20  
5.30 7.80  
5.00 7.40  
14  
1
PIN 1  
1.85  
1.75  
1.65  
COPLANARITY  
0.10  
2.00 MAX  
0.25  
0.09  
8°  
4°  
0°  
0.65  
BSC  
0.95  
0.75  
0.55  
0.38  
0.22  
0.05 MIN  
SEATING  
PLANE  
COMPLIANT TO JEDEC STANDARDS MO-150AH  
Figure 27. 28-Lead Shrink Small Outline Package [SSOP]  
(RS-28)  
Dimensions shown in millimeters  
Rev. D | Page 15 of 16  
ADM206/ADM207/ADM208/ADM211/ADM213  
ORDERING GUIDE  
Model1  
Temperature Range  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
Package Description  
24-lead PDIP  
24-lead PDIP  
Package Option  
N-24-1  
N-24-1  
RW-24  
RW-24  
RW-24  
RW-24  
RS-24  
ADM206AN  
ADM206ANZ  
ADM206AR  
ADM206AR-REEL  
ADM206ARZ  
ADM206ARZ-REEL  
ADM206ARS  
ADM206ARSZ  
ADM206ARSZ-REEL  
ADM207AN  
ADM207ANZ  
ADM207AR  
ADM207ARZ  
ADM207ARZ-REEL  
ADM207ARS  
ADM207ARSZ  
ADM207ARSZ-REEL  
ADM208AN  
ADM208ANZ  
ADM208AR  
ADM208AR-REEL  
ADM208ARZ  
ADM208ARZ-REEL  
ADM208ARSZ  
ADM208ARSZ-REEL  
ADM211AR  
ADM211AR-REEL  
ADM211ARZ  
ADM211ARZ-REEL  
ADM211ARS  
ADM211ARS-REEL  
ADM211ARSZ  
ADM211ARSZ-REEL  
ADM213AR  
ADM213ARZ  
ADM213ARZ-REEL  
ADM213ARS  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SSOP  
24-lead SSOP  
24-lead SSOP  
24-lead PDIP  
RS-24  
RS-24  
N-24-1  
N-24-1  
RW-24  
RW-24  
RW-24  
RS-24  
24-lead PDIP  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SSOP  
24-lead SSOP  
24-lead SSOP  
24-lead PDIP  
RS-24  
RS-24  
N-24-1  
N-24-1  
RW-24  
RW-24  
RW-24  
RW-24  
RS-24  
24-lead PDIP  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SOIC_W  
24-lead SSOP  
24-lead SSOP  
28-lead SOIC_W  
28-lead SOIC_W  
28-lead SOIC_W  
28-lead SOIC_W  
28-lead SSOP  
28-lead SSOP  
28-lead SSOP  
28-lead SSOP  
28-lead SOIC_W  
28-lead SOIC_W  
28-lead SOIC_W  
28-lead SSOP  
28-lead SSOP  
RS-24  
RW-28  
RW-28  
RW-28  
RW-28  
RS-28  
RS-28  
RS-28  
RS-28  
RW-28  
RW-28  
RW-28  
RS-28  
RS-28  
RS-28  
ADM213ARS-REEL  
ADM213ARSZ  
ADM213ARSZ-REEL  
28-lead SSOP  
28-lead SSOP  
RS-28  
1 Z = RoHS Compliant Part.  
©2011 Analog Devices, Inc. All rights reserved. Trademarks and  
registered trademarks are the property of their respective owners.  
D00067-0-5/11(D)  
Rev. D | Page 16 of 16