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FEATURES 0.1 F to 10 F Capacitors 120 kB/s Data Rate Two Receivers Active in Shutdown (ADM213) On-Board DC-to-DC Converters 9 V Output Swing with 5 V Supply Low Power (15 mW) Low Power Shutdown 5 W 30 V Receiver Input Levels Latch-Up FREE Plug-In Upgrade for MAX205-211/213 APPLICATIONS Computers Peripherals Modems Printers Instruments
0.1 F, 5 V Powered CMOS RS-232 Drivers/Receivers ADM206-ADM211/ADM213
TYPICAL OPERATING CIRCUIT
5V INPUT + C1+ C1- + C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER T1 T2 T3 T4 R1 R2 R3 R4 R5 VCC V+ V- + 0.1 F 16V 0.1 F + 6.3V 0.1 F + 16V 0.1 F
0.1 F 16V
T1IN T2IN T3IN T4IN R1OUT R2OUT TTL/CMOS OUTPUTS R3OUT R4OUT R5OUT EN GND
T1OUT T2OUT T3OUT T4OUT R1IN R2IN R3IN R4IN R5IN SD RS-232 INPUTS2 RS-232 OUTPUTS
TTL/CMOS INPUTS1
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 12 V is not available. The ADM206, ADM211, and ADM213 feature a low power shutdown mode that reduces power dissipation to less than 5 W, making them ideally suited for battery-powered equipment. The ADM213 has an active low shutdown and an active high receiver enable control. Two receivers of the ADM213 remain active during shutdown. This feature is useful for ring indicator monitoring. All members of the ADM2xx family, except the ADM209, include two internal charge pump voltage converters that allow
ADM211
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
operation from a single 5 V supply. These converters convert the 5 V input power to the 10 V required for RS-232 output levels. The ADM209 is 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.
Table I. Selection Table
Part Number ADM206 ADM207 ADM208 ADM209 ADM211 ADM213
Power Supply Voltage 5V 5V 5V 5 V and 9 V to 13.2 V 5V 5V
Number Number of RS-232 of RS-232 External Drivers Receivers Capacitors 4 5 4 3 4 4 3 3 4 5 5 5 4 4 4 2 4 4
Low Power Shutdown (SD) Yes No No No Yes Yes (SD)
TTL Three-State EN Yes No No Yes Yes Yes (EN)
Number of Receivers Active in Shutdown 0 0 0 0 0 2
REV. B
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. 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 www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2002
ADM206-ADM211/ADM213-SPECIFICATIONS V+ = 9 V to 13.2 V (ADM209); C1-C4 = 0.1 Ceramic. All Specifications T to T unless otherwise noted.)
MIN MAX,
(VCC = 5 V
10% (206, 207, 208, 2O9, 211, 213); F
Parameter Output Voltage Swing VCC Power Supply Current V+ Power Supply Current Shutdown Supply Current Input Logic Threshold Low, VINL Input Logic Threshold High, VINH 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, VOL TTL/CMOS Output Voltage High, VOH TTL/CMOS Output Leakage Current Output Enable Time (TEN) Output Disable Time (TDIS) Propagation Delay Transition Region Slew Rate Output Resistance RS-232 Output Short Circuit Current
Guaranteed by design. Specifications subject to change without notice.
*
Min 5
Typ 9 5 0.4 3.5 1
Max 13 1 5 10 0.8 25 +30 2.4 7 0.4 10
Unit V mA mA mA A V V A V V V V k V V A ns ns
Test Conditions/Comments All Transmitter Outputs Loaded with 3 k to Ground No Load No Load, ADM209 No Load, V+ = 12 V, ADM209 Only TIN, EN, SD, EN, SD TIN, EN, SD, EN, SD TIN = 0 V
2.4 10 -30 0.8 1.2 1.7 0.25 5
3 3.5
0.05 115 165 0.5 8 300 12
5
s V/s mA
60
TA = 0C to 85C IOUT = 1.6 mA IOUT = -1.0 mA EN = VCC, EN = 0 V, 0 V ROUT VCC ADM206, ADM209, ADM211 (Figure 15. CL = 150 pF) ADM206, ADM209, ADM211 (Figure 15. RL = 1 k) RS-232 to TTL RL = 3 k, CL = 2500 pF Measured from +3 V to -3 V or -3 V to +3 V VCC = V+ = V- = 0 V, VOUT = 2 V
-2-
REV. B
ADM206-ADM211/ADM213
ABSOLUTE MAXIMUM RATINGS*
(TA = 25C, unless otherwise noted.)
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 TOUT . . . . . . . . . . . . . . . . . . . (V+, +0.3 V) to (V-, -0.3 V) ROUT . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to (VCC + 0.3 V) Short Circuit Duration TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Power Dissipation N-24 DIP (Derate 13.5 mW/C above 70C) . . . 1000 mW R-24 SOIC (Derate 12 mW/C above 70C) . . . . . 850 mW R-28 SOIC (Derate 12.5 mW/C above 70C) . . . 900 mW RS-24 SSOP (Derate 12 mW/C above 70C) . . . . 850 mW RS-28 SSOP (Derate 10 mW/C above 70C) . . . . 900 mW
Thermal Impedance, JA N-24 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120C/W R-24 SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85C/W R-28 SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80C/W RS-24 SSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115C/W RS-28 SSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100C/W Operating Temperature Range Industrial (A Version) . . . . . . . . . . . . . . . -40C to +85C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Lead Temperature, Soldering . . . . . . . . . . . . . . . . . . . 300C Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . 215C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . 220C
*This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
ORDERING GUIDE Model ADM206 ADM206AN Temperature Range Package Option* Model ADM207 Temperature Range Package Option* Model ADM208 Temperature Range Package Option*
-40 C to +85 C N-24 ADM206AR -40 C to +85 C R-24 ADM206ARS -40 C to +85 C RS-24
ADM209 ADM209AN
ADM207AN -40 C to +85 C N-24 ADM207AR -40 C to +85 C R-24 ADM207ARS -40 C to +85 C RS-24
ADM211
ADM208AN -40 C to +85 C N-24 ADM208AR -40 C to +85 C R-24 ADM208ARS -40 C to +85 C RS-24
ADM213
-40 C to +85 C N-24 ADM209AR -40 C to +85 C R-24 ADM209ARS -40 C to +85 C RS-24
ADM211AR -40 C to +85 C R-28 ADM211ARS -40 C to +85 C RS-28
ADM213AR -40 C to +85 C R-28 ADM213ARS -40 C to +85 C RS-28
*N = Plastic DIP; R = Small Outline IC (SOIC); and RS = Small Shrink Outline Package (SSOP).
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 the ADM206-ADM211/ADM213 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.
WARNING!
ESD SENSITIVE DEVICE
REV. B
-3-
ADM206-ADM211/ADM213
T3OUT T1OUT T2OUT R1IN R1OUT T2IN T1IN GND VCC
1 2 3 4 5 6 7 8 9 24 23 22 21
T4OUT R2IN R2OUT SD EN T4IN
T3OUT T1OUT T2OUT R1IN R1OUT T2IN T1IN GND VCC
1 2 3 4 5 6
24 23 22 21
T4OUT R2IN R2OUT T5IN T5OUT
ADM206
20 19
ADM207
20
TOP VIEW (Not to Scale) 18 T3 IN
17 16 15 14 13
TOP VIEW 19 T4IN 7 (Not to Scale) 18 T3IN
8 9 17 16 15 14 13
R3OUT R3IN V- C2- C2+
R3OUT R3IN V- C2- C2+
C1+ 10 V+ 11 C1- 12
C1+ 10 V+ 11 C1- 12
Figure 1. ADM206 DIP/SOIC/SSOP Pin Configuration
Figure 3. ADM207 DIP/SOIC/SSOP Pin Configuration
5V INPUT + C1+ C1- + C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER T1 T2 T3 T4 R1 R2 R3 VCC V+ V- +
5V INPUT + C1+ C1- + C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER T1 T2 T3 T4 T5 R1 R2 R3 GND VCC V+ V- +
0.1 F 6.3V
0.1 F + 6.3V 0.1 F + 16V
0.1 F
0.1 F 6.3V
0.1 F + 6.3V 0.1 F + 16V
0.1 F
0.1 F 16V
0.1 F 16V
T1IN T2IN T3IN T4IN R1OUT TTL/CMOS OUTPUTS R2OUT R3OUT EN GND
T1OUT T2OUT T3OUT T4OUT R1IN R2IN R3IN SD RS-232 INPUTS2 RS-232 OUTPUTS
T1IN T2IN TTL/CMOS INPUTS1 T3IN T4IN T5IN R1OUT TTL/CMOS OUTPUTS R2OUT R3OUT
T1OUT T2OUT T3OUT T4OUT T5OUT R1IN R2IN R3IN RS-232 INPUTS2 RS-232 OUTPUTS
TTL/CMOS INPUTS1
ADM206
ADM207
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 2. ADM206 Typical Operating Circuit
Figure 4. ADM207 Typical Operating Circuit
-4-
REV. B
ADM206-ADM211/ADM213
T2OUT T1OUT R2IN R2OUT T1IN R1OUT R1IN GND VCC
1 2 3 4 5 6 24 23 22 21
T3OUT R3IN R3OUT T4IN T4OUT
R1OUT R1IN GND VCC V+ C+ C- V- R5IN
1 2 3 4 5 6
24 23 22 21
T1IN T2IN R2OUT R2IN T2OUT
ADM208
20
ADM209
20
TOP VIEW 19 T3IN 7 (Not to Scale) 18 T2IN
8 9 17 16 15 14 13
TOP VIEW 19 T1OUT 7 (Not to Scale) 18 R3IN
8 9 17 16 15 14 13
R4OUT R4IN V- C2- C2+
R3OUT T3IN NC EN T3OUT
C1+ 10 V+ 11 C1- 12
R5OUT 10 R4OUT 11 R4IN 12
Figure 5. ADM208 DIP/SOIC/SSOP Pin Configuration
Figure 7. ADM209 DIP/SOIC/SSOP Pin Configuration
5V INPUT + C1+ C1- + C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER T1 T2 T3 T4 R1 R2 R3 R4 VCC V+ V- +
5V INPUT 0.1 F +
0.1 F 6.3V
0.1 F + 6.3V 0.1 F + 16V
0.1 F
0.1 F 16V
+
C1+ C1-
VCC +12V TO -12V VOLTAGE INVERTER V+ V- + 0.1 F 16V 9V TO 13.2V INPUT
0.1 F 16V
T1IN T2IN T3IN T4IN R1OUT R2OUT TTL/CMOS OUTPUTS R3OUT R4OUT
T1OUT T2OUT T3OUT T4OUT R1IN R2IN R3IN R4IN RS-232 INPUTS2
TTL/CMOS OUTPUTS TTL/CMOS INPUTS1
T1IN T2IN T3IN R1OUT R2OUT R3OUT R4OUT R5OUT EN GND
T1 T2 T3 R1 R2 R3 R4 R5
T1OUT T2OUT T3OUT R1IN R2IN R3IN R4IN R5IN NC RS-232 INPUTS2 RS-232 OUTPUTS
TTL/CMOS INPUTS1
RS-232 OUTPUTS
GND
ADM208
ADM209
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 6. ADM208 Typical Operating Circuit
Figure 8. ADM209 Typical Operating Circuit
REV. B
-5-
ADM206-ADM211/ADM213
T3OUT 1 T1OUT 2 T2OUT 3 R2IN 4 R2OUT 5 T2IN 6 T1IN 7
28 T4OUT 27 R3IN 26 R3OUT 25 SD 24 EN
T3OUT 1 T1OUT 2 T2OUT 3 R2IN 4 R2OUT 5 T2IN 6 T1IN 7
28 27 26 25 24
T4OUT R3IN R3OUT SD EN R4IN*
ADM211
23 R4IN
ADM213
23
TOP VIEW 22 R4OUT R1OUT 8 (Not to Scale) 21 T4IN R1IN 9 GND 10 VCC 11 C1+ 12 V+ 13 C1- 14
20 T3IN 19 R5OUT 18 R5IN 17 V- 16 C2- 15 C2+
TOP VIEW 22 R4OUT* R1OUT 8 (Not to Scale) 21 T4IN R1IN 9 GND 10 VCC 11 C1+ 12 V+ 13 C1- 14
20 19 18 17 16 15
T3IN R5OUT* R5IN* V- C2- C2+
*ACTIVE IN SHUTDOWN
Figure 9. ADM211 SOIC/SSOP Pin Configuration
Figure 11. ADM213 SOIC/SSOP Pin Configuration
5V INPUT + C1+ C1- + C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER T1 T2 T3 T4 R1 R2 R3 R4 R5 VCC V+ V- +
+ C1+ C1- + C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER T1 T2 T3 T4 R1 R2 R3 R4 R5 VCC V+ V-
5V INPUT +
0.1 F 16V
0.1 F + 6.3V 0.1 F + 16V
0.1 F
0.1 F 16V
0.1 F + 6.3V 0.1 F + 16V
0.1 F
0.1 F 16V
0.1 F 16V
T1IN T2IN T3IN T4IN R1OUT R2OUT TTL/CMOS OUTPUTS R3OUT R4OUT R5OUT EN GND
T1OUT T2OUT T3OUT T4OUT R1IN R2IN R3IN R4IN R5IN SD RS-232 INPUTS2
TTL/CMOS OUTPUTS
T1IN T2IN T3IN T4IN R1OUT R2OUT R3OUT R4OUT3 R5OUT3 EN GND
T1OUT T2OUT T3OUT T4OUT R1IN R2IN R3IN R4IN3 R5IN3 SD RS-232 INPUTS2 RS-232 OUTPUTS
TTL/CMOS INPUTS1
RS-232 OUTPUTS
TTL/CMOS INPUTS1
ADM211
ADM213
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
NOTES 1INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. 2INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. 3ACTIVE IN SHUTDOWN.
Figure 10. ADM211 Typical Operating Circuit
Figure 12. ADM213 Typical Operating Circuit
-6-
REV. B
ADM206-ADM211/ADM213
PIN FUNCTION DESCRIPTIONS
Mnemonic VCC V+ V- GND C+ C- C1+ C1- C2+ C2- TIN TOUT RIN ROUT EN/EN
Function Power Supply Input 5 V 10% Internally Generated Positive Supply (10 V nominal) on all parts except ADM209. The ADM209 requires an external 9 V to 13.2 V supply. Internally Generated Negative Supply (-10 V Nominal) Ground Pin. Must be connected to 0 V. (ADM209 Only) external capacitor (+ terminal) is connected to this pin. (ADM209 Only) external capacitor (- terminal) is connected to this pin. (ADM206, ADM207, ADM208, ADM211, and ADM213) external capacitor (+ terminal) is connected to this pin. (ADM206, ADM207, ADM208, ADM211, and ADM213) external capacitor (- terminal) is connected to this pin. (ADM206, ADM207, ADM208, ADM211, and ADM213) external capacitor (+ terminal) is connected to this pin. (ADM206, ADM207, ADM208, ADM211, and ADM213) external capacitor (- terminal) is connected to this pin. Transmitter (driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 k pull-up resistor to VCC 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 k pull-down resistor to GND is connected on each input. Receiver Outputs. These are TTL/CMOS levels. Enable Input. Active low on ADM206, ADM209, 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 facility is useful for connecting to microprocessor systems. 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 W. No Connect. No connections are required to this pin.
Table II. ADM206 and ADM211 Truth Table
SD/SD
NC
SD 0 0 1
EN 0 1 0
Status Normal Operation Normal Operation Shutdown
Transmitters T1-T5 Enabled Enabled Disabled
Receivers R1-R5 Enabled Disabled Disabled
Table III. ADM213 Truth Table
SD 0 0 1 1
EN 0 1 0 1
Status Shutdown Shutdown Normal Operation Normal Operation
Transmitters T1-T4 Disabled Disabled Enabled Enabled
Receivers R1-R3 Disabled Disabled Disabled Enabled
Receivers R4, R5 Disabled Enabled Disabled Enabled
REV. B
-7-
ADM206-ADM211/ADM213 -Typical Performance Characteristics
15
15
10 V+ 5
Tx O/P - V
10 Tx O/P HIGH 5
V+/V- - V
0
0
-5 V- -10
-5 Tx O/P LOW
-10
-15
0
5
10 LOAD CURRENT - mA
15
20
-15
0
2
4 6 LOAD CURRENT - mA
8
10
TPC 1. Charge Pump V+, V- vs. Load Current
TPC 4. Transmitter Output Voltage vs. Load Current
50 45
350 300
40 SLEW RATE - V/ s 35 30 25 20 15 10 5 0 0 POSITIVE SLEW NEGATIVE SLEW IMPEDANCE -
V- IMP 250 200
150 V+ IMP 100 50
500
1500 2000 1000 LOAD CAPACITANCE - pF
2500
3000
0
4.5
4.7
4.9 VCC - V
5.1
5.3
5.5
TPC 2. Transmitter Slew Rate vs. Load Capacitance
TPC 5. Charge Pump Impedance vs. VCC
9 7 Tx O/P HIGH LOADED 5
1 T T 2 3 T SD V+
3
Tx O/P - V
1 0 -1 -3 -5 -7 -9
V- 3.1V CH1 5.00V CH2 5.00V M50.0 s CH1 CH3 5.00V BW V+, V- EXITING SHUTDOWN (SD)
Tx O/P LOW LOADED 4.0 4.5 5.0 VCC - V 5.5 6.0
TPC 3. Transmitter Output Voltage vs. VCC
TPC 6. Charge Pump, V+, V- Exiting Shutdown
-8-
REV. B
ADM206-ADM211/ADM213
CIRCUIT DESCRIPTION
Tx INPUT 1 T T 2 Tx OUTPUT
The internal circuitry in the ADM206-ADM211/ADM213 consists of three main sections. These are: (a) A charge pump voltage converter (b) RS-232 to TTL/CMOS receivers (c) TTL/CMOS to RS-232 transmitters
Charge Pump DC-to-DC Voltage Converter
CH1 5.00V
CH2 5.00V M1.00 s CH1
800mV
TPC 7. Transmitter Output Loaded Slew Rate
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. This is done in two stages using a switched capacitor technique as illustrated in Figures 13 and 14. 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.
VCC S1 C1 S2 GND INTERNAL OSCILLATOR + S4 S3 C3 + V+ = 2VCC
1
T T
Tx INPUT
VCC
2 Tx OUTPUT
Figure 13. Charge-Pump Voltage Doubler
CH1 5.00V CH2 5.00V M1.00 s CH1 800mV
FROM VOLTAGE DOUBLER
V+
S1 C2 S2 +
S3 GND C4 S4 V- = -(V+) +
TPC 8. Transmitter Output Unloaded Slew Rate
GND INTERNAL OSCILLATOR
GENERAL INFORMATION
Figure 14. Charge-Pump Voltage Inverter
The ADM206-ADM211/ADM213 family of RS-232 drivers/ receivers is designed to solve interface problems by meeting the EIA-232-E 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 ADM206- ADM211/ADM213 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 communications needs. The ADM206-ADM211/ ADM213 are modifications, enhancements, and improvements to the AD230-AD241 family and derivatives thereof. They are essentially plug-in compatible and do not have materially different applications. The ADM206, ADM211, and ADM213 are particularly useful in battery-powered systems, since they feature a low power shutdown mode that reduces power dissipation to less than 5 W. The ADM209 includes only a negative charge pump converter and is intended for applications where a positive 12 V is available. To facilitate sharing a common line or for connection to a microprocessor data bus, the ADM206, ADM209, ADM211, and ADM213 feature an enable (EN) function. When disabled, the receiver outputs are placed in a high impedance state.
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 C1 and C2 may also be reduced at the expense of higher output impedance on the V+ and V- supplies. The V+ and V- supplies may also be used to power external circuitry if the current requirements are small.
Transmitter (Driver) Section
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 9 V. Even under worst-case conditions, the drivers are guaranteed to meet the 5 V 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 may be left unconnected, since an internal 400 k pull-up resistor pulls them high, forcing the outputs into a low state. As required by the EIA-232-E standard, the slew rate is limited to less than 30 V/s, without the need for an external slew limiting capacitor, and the output impedance in the power-off state is greater than 300 .
REV. B
-9-
ADM206-ADM211/ADM213
Receiver Section
3V EN* 0V TEN 3.5V ROUT 0.8V TDIS VOH - 0.1V VOL + 0.1V
The receivers are inverting level shifters that accept EIA-232-E input levels ( 5 V to 15 V) and translate them into 5 V TTL/ CMOS levels. The inputs have internal 5 k 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, which are well within the 3 V EIA-232-E requirement. The low level threshold is deliberately positive, since it ensures that an unconnected input will be interpreted as a low level. The receivers have Schmitt trigger inputs with a hysteresis level of 0.5 V. This ensures error-free reception for both noisy inputs and for inputs with slow transition times.
Shutdown (SD)
*POLARITY OF EN IS REVERSED FOR ADM213.
Figure 15. Enable Timing
APPLICATION HINTS Driving Long Cables
The ADM206-ADM211/ADM213 feature a control input that may be used to disable the part and reduce the power consumption to less than 5 W. 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 ADM213, are put into a high impedance disabled state. Receivers R4 and R5 on the ADM213 remain enabled during shutdown. This feature allows monitoring external activity, such as ring indicator monitoring, while the device is in a low power shutdown mode. The shutdown control input is active high on all parts except the ADM213 where it is active low. Refer to Tables II and III.
Enable Input
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 versus cable length. Large load capacitances cause a reduction in slew rate, and hence the maximum transmission baud rate is decreased. The ADM206-ADM211/ADM213 are designed so that the slew rate reduction with increasing load capacitance is minimized. 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, since the signal passes slowly through the transition region. The ADM206-ADM211/ADM213 have 0.5 V of hysteresis to guard against this. This ensures that, even in noisy environments, error-free reception can be achieved.
High Baud Rate Operation
The ADM209, ADM211, and ADM213 feature an enable input used to enable or disable the receiver outputs. The enable input is active low on the ADM209 and ADM211 and active high on the ADM213. Refer to Tables II and III. When disabled, all receiver 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 15.
The ADM206-ADM211/ADM213 feature high slew rates, permitting data transmission at rates well in excess of the EIA232-E specification. The drivers maintain 5 V signal levels at data rates up to 120 kB/s under worst-case loading conditions.
-10-
REV. B
ADM206-ADM211/ADM213
OUTLINE DIMENSIONS 24-Lead Plastic DIP (N-24)
Dimensions shown in inches and (millimeters)
24 PIN 1 1 1.228 (31.19) 1.226 (31.14) 0.130 (3.30) 0.128 (3.25) 12
28 15
28-Lead SOIC (R-28)
Dimensions shown in millimeters and (inches)
18.10 (0.7126) 17.70 (0.6969)
13 0.260 0.001 (6.61 0.03)
0.32 (8.128) 0.30 (7.62)
7.60 (0.2992) 7.40 (0.2913)
1 14
10.65 (0.4193) 10.00 (0.3937)
SEATING PLANE 0.02 (0.5) 0.016 (0.41) 0.11 (2.79) 0.09 (2.28) 0.07 (1.78) 0.05 (1.27)
15 0
0.011 (0.28) 0.009 (0.23)
PIN 1 COPLANARITY 0.30 (0.0118) 0.10 (0.0039)
2.65 (0.1043) 2.35 (0.0925)
0.75 (0.0295) 0.25 (0.0098)
45
NOTES 1. LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH. 2. PLASTIC LEADS WILL BE EITHER SOLDER DIPPED OR TIN PLATED IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS.
8 0 1.27 (0.0500) 0.51 (0.0201) SEATING 0.32 (0.0126) PLANE BSC 0.33 (0.0130) 0.23 (0.0091)
1.27 (0.0500) 0.40 (0.0157)
24-Lead SOIC (R-24)
Dimensions shown in millimeters and (inches)
15.60 (0.6142) 15.20 (0.5984)
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 AE
28-Lead SSOP (RS-28)
13
24
Dimensions shown in inches and (millimeters)
7.60 (0.2992) 7.40 (0.2913)
1
12
10.65 (0.4193) 10.00 (0.3937)
28 15 0.212 (5.38) 0.205 (5.207) 0.311 (7.9) 0.301 (7.64) 1 14
PIN 1 COPLANARITY 0.30 (0.0118) 0.10 (0.0039) 1.27 (0.0500) BSC
2.65 (0.1043) 2.35 (0.0925) () 8 0 0.51 (0.0201) SEATING 0.32 (0.0126) PLANE 0.0130 (0.33) 0.23 (0.0091)
0.75 (0.0295) 0.25 (0.0098)
45
PIN 1
1.27 (0.0500) 0.40 (0.0157)
0.407 (10.34) 0.397 (10.08) 0.07 (1.78) 0.066 (1.67)
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 AD
24-Lead SSOP (RS-24)
Dimensions shown in inches and (millimeters)
0.008 (0.203) 0.002 (0.050)
0.0256 (0.65) BSC
8 0.009 (0.229) 0 0.005 (0.127)
0.037 (0.94) 0.022 (0.559)
NOTES 1. LEAD NO. 1 IDENTIFIED BY A DOT. 2. LEADS WILL BE EITHER TIN PLATED OR SOLDER DIPPED IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS.
24
13
0.212 (5.38) 0.205 (5.207) 0.311 (7.9) 0.301 (7.64) 1 12
PIN 1
0.328 (8.33) 0.318 (8.08)
0.07 (1.78) 0.066 (1.67)
0.008 (0.203) 0.002 (0.050)
0.0256 (0.65) BSC
0.009 (0.229) 0.005 (0.127)
8 0
0.037 (0.94) 0.022 (0.559)
NOTES 1. LEAD NO. 1 IDENTIFIED BY A DOT. 2. LEADS WILL BE EITHER TIN PLATED OR SOLDER DIPPED IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS.
REV. B
-11-
ADM206-ADM211/ADM213 Revision History
Location 3/02--Data Sheet changed from REV. 0 to REV. A. Page
Changes to numbers in Min/Typ/Max column of Specifications page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Updated Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8, 9
6/02--Data Sheet changed from REV. A to REV. B.
C00067-0-6/02(B) PRINTED IN U.S.A.
Removed all references to ADM205 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal
-12-
REV. B

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