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EMI/EMC-Compliant, 15 kV, ESD-Protected RS-232 Line Drivers/Receivers ADM202E/ADM1181A
FEATURES
Complies with 89/336/EEC EMC directive ESD protection to IEC1000-4-2 (801.2) 8 kV: contact discharge 15 kV: air-gap discharge 15 kV: human body model EFT fast transient/burst immunity (IEC1000-4-4) Low EMI emissions (EN55022) 230 kbits/s data rate guaranteed TSSOP package option Upgrade for MAX202E, 232E, LT1181A
FUNCTIONAL BLOCK DIAGRAMS
5V INPUT 0.1F 10V 0.1F 10V C1+ C1- C2+ C2- +5V TO +10V V CC VOLTAGE V+ DOUBLER +10V TO -10V V- VOLTAGE INVERTER T1 T2 R1 R2 C3 0.1F 6.3V C4 0.1F 10V T1OUT T2OUT R1IN R2IN EIA/TIA-232 OUTPUTS C5 0.1F
T1IN CMOS INPUTS T2IN R1OUT R2OUT
CMOS OUTPUTS
APPLICATIONS
General-purpose RS-232 data link Portable instruments PDAs
EIA/TIA-232 INPUTS*
GND
ADM202E
00066-001
00066-002
*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 1.
5V INPUT 0.1F 10V 0.1F 10V C1+ C1- +5V TO +10V V CC VOLTAGE V+ DOUBLER C4 0.1F 10V T1OUT T2OUT R1IN R2IN EIA/TIA-232 INPUTS* C5 0.1F C3 10V 0.1F 10V
C2+ +10V TO -10V V- VOLTAGE C2- INVERTER T1 T2 R1 R2
GENERAL DESCRIPTION
The ADM202E and ADM1181A are robust, high speed, 2-channel RS-232/V.28 interface devices that operate from a single 5 V power supply. Both products are suitable for operation in harsh electrical environments and are compliant with the EU directive on EMC (89/336/EEC). Both the level of electromagnetic emissions and immunity are in compliance. EM immunity includes ESD protection in excess of 15 kV on all I/O lines, fast transient/burst protection (1000-4-4), and radiated immunity (1000-4-3). EM emissions include radiated and conducted emissions as required by Information Technology Equipment EN55022, CISPR22. The ADM202E and ADM1181A conform to the EIA-232E and CCITT V.28 specifications and operate at data rates up to 230 kbps. Four external 0.1 F charge-pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 5 V supply.
T1IN CMOS INPUTS T2IN R1OUT R2OUT
EIA/TIA-232 OUTPUTS
CMOS OUTPUTS
GND
ADM1181A
*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 2.
The ADM202E provides a robust pin-compatible upgrade for existing ADM202, ADM232L, or MAX202E/MAX232E sockets. It is available in a 16-lead PDIP, a wide SOIC, a narrow SOIC, and a space-saving TSSOP package that is 44% smaller than the SOIC package. The ADM1181A provides a robust pin-compatible upgrade for the LTC1181A, and it is available in a 16-lead PDIP package and a wide 16-lead SOIC package.
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: 781.326.8703 (c) 2005 Analog Devices, Inc. All rights reserved.
ADM202E/ADM1181A TABLE OF CONTENTS
Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 General Description ......................................................................... 6 Circuit Description....................................................................... 6 Charge-Pump DC-to-DC Voltage Converter....................... 6 Transmitter (Driver) Section .................................................. 6 Receiver Section ....................................................................... 6 High Baud Rate............................................................................. 6 ESD/EFT Transient Protection Scheme .................................... 7 Typical Performance Characteristics ..............................................8 ESD Testing (IEC1000-4-2) ...................................................... 10 Fast Transient/Burst Testing (IEC1000-4-4)........................... 11 IEC1000-4-3 Radiated Immunity ............................................ 12 Emissions/Interference .............................................................. 12 Conducted Emissions ................................................................ 12 Radiated Emissions .................................................................... 13 Outline Dimensions ....................................................................... 14 Ordering Guide .......................................................................... 15
REVISION HISTORY
2/05--Rev. B to Rev. C. Updated Format..................................................................Universal Changed Hysteresis Level ..................................................Universal Change to Specifications.................................................................. 3 Added ESD Caution ......................................................................... 4 Change to Receiver Section............................................................. 6 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 15 2/01--Rev. A to Rev. B. Deletion of one ESD Rating in ABSOLUTE MAXIMUM RATINGS............................................. 4 Removal of one column in Table II ................................................ 8
Rev. C | Page 2 of 16
ADM202E/ADM1181A SPECIFICATIONS
VCC = 5.0 V 10%, C1 to C4 = 0.1 F. All specifications TMIN to TMAX, unless otherwise noted. Table 1.
Parameter DC CHARACTERISTICS Operating Voltage Range VCC Power Supply Current LOGIC Input Logic Threshold Low, VINL Input Logic Threshold High, VINH CMOS Output Voltage Low, VOL CMOS Output Voltage High, VOH Logic Pull-Up Current RS-232 RECEIVER EIA-232 Input Voltage Range EIA-232 Input Threshold Low EIA-232 Input Threshold High EIA-232 Input Hysteresis EIA-232 Input Resistance RS-232 TRANSMITTER Output Voltage Swing Transmitter Output Resistance RS-232 Output Short-Circuit Current TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay TPHL TPLH Transmitter Propagation Delay Transition Region Slew Rate EM IMMUNITY ESD Protection (I/O Pins) Min 4.5 Typ 5.0 2.5 13 Max 5.5 6.0 18 0.8 2.4 0.4 3.5 +12 -30 0.4 25 +30 1.2 1.6 0.65 5 9.0 2.4 7 Unit V mA mA V V V V A V V V V k V mA kbps 0.1 0.3 1.0 8 1 1 1.5 30 s s s V/s Test Conditions/Comments
No load RL = 3 k to GND TIN TIN IOUT = 3.2 mA IOUT = -1 mA TIN = 0 V
3 5.0 300
TA = 0C to 85C All transmitter outputs loaded with 3 k to ground VCC = 0 V, VOUT = 2 V
10 230
60
RL = 3 k to 7 k, CL = 50 pF to 1000 pF
3
RL = 3 k, CL = 1000 pF RL = 3 k, CL = 1000 pF Measured from +3 V to -3 V, or -3 V to +3 V Human body model IEC1000-4-2 air discharge IEC1000-4-2 contact discharge IEC1000-4-4 IEC1000-4-3
EFT Protection (I/O Pins) EMI Immunity
15 15 8 kV 2 10
kV kV kV kV V/m
Rev. C | Page 3 of 16
ADM202E/ADM1181A ABSOLUTE MAXIMUM RATINGS
TA = 25C, unless otherwise noted. Table 2.
Parameter VCC V+ V- Input Voltages TIN RIN Output Voltages TOUT ROUT Short-Circuit Duration TOUT Power Dissipation N-16 (Derate 6 mW/C Above 50C) JA, Thermal Impedance Power Dissipation R-16 (Derate 6 mW/C Above 50C) JA, Thermal Impedance Power Dissipation RU-16 (Derate 6 mW/C Above 50C) JA, Thermal Impedance Operating Temperature Range Industrial (A Version) Storage Temperature Range Lead Temperature (Soldering, 10 sec) ESD Rating (MIL-STD-883B) (I/O Pins) ESD Rating (IEC1000-4-2 Air) (I/O Pins) ESD Rating (IEC1000-4-2 Contact) (I/O Pins) EFT Rating (IEC1000-4-4) (I/O Pins) Values -0.3 V to +6 V (VCC - 0.3 V) to +14 V +0.3 V to -14 V 0.3 V to (V+, +0.3 V) 30 V 15 V -0.3 V to (VCC + 0.3 V) Continuous 450 mW 117C/W 450 mW 158C/W 500 mW 158C/W -40C to +85C -65C to +150C 300C 15 kV 15 kV 8 kV 2 kV
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 sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods 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 16
ADM202E/ADM1181A PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
C1+ 1 V+ 2 C1- 3 C2+ 4 C2- 5 16 VCC 15 GND
ADM202E 14 T1OUT ADM1181A
13 R1IN
TOP VIEW 12 R1OUT (Not to Scale) V- 6 11 T1IN
00066-003
T2OUT 7 R2IN 8
10 T2IN 9 R2OUT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. 16 2 6 15 1, 3 4, 5 10, 11 7, 14 8, 13 9, 12 Mnemonic VCC V+ V- GND C1+, C1- C2+, C2- TIN TOUT RIN ROUT Description Power Supply Input: 5 V 10%. Internally Generated Positive Supply (+9 V nominal). Internally Generated Negative Supply (-9 V nominal). Ground Pin. Must be connected to 0 V. External Capacitor 1 is connected between these pins. A 0.1 F capacitor is recommended, but larger capacitors of up to 47 F can be used. External Capacitor 2 is connected between these pins. A 0.1 F capacitor is recommended, but larger capacitors of up to 47 F can be used. Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. Transmitter (Driver) Outputs. These are RS-232 signal levels (typically 9 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 CMOS output logic levels.
5V INPUT 0.1F 10V
1 C1+ 3 C1- 4 C2+ 5 C2-
5V INPUT 0.1F 10V 0.1F 10V
1 C1+ 3 C1-
+5V TO +10V V CC 16 VOLTAGE V+ 2 DOUBLER +10V TO -10V V- 6 VOLTAGE INVERTER T1 T2 R1 R2
14
C3 0.1F 6.3V C4 0.1F 10V T1OUT T2OUT R1IN R2IN
C5 0.1F
+5V TO +10V V CC 16 VOLTAGE V+ 2 DOUBLER
6
0.1F 10V T1IN CMOS INPUTS T2IN R1OUT R2OUT
4 C2+ +10V TO -10V V- 5 C2-
VOLTAGE INVERTER T1 T2 R1 R2
14
C4 0.1F 10V T1OUT T2OUT R1IN R2IN
C5 0.1F C3 10V 0.1F 10V
11
10
7
EIA/TIA-232 OUTPUTS
T1IN CMOS INPUTS T2IN R1OUT R2OUT
11
10
7
EIA/TIA-232 OUTPUTS
12
13
12
13
CMOS OUTPUTS
EIA/TIA-232 INPUTS*
CMOS OUTPUTS
9
8
EIA/TIA-232 INPUTS*
9
8
GND
15
ADM202E
00066-004
GND
15
ADM1181A
00066-005
*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT
*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 4. ADM202E Typical Operating Circuit
Figure 5. ADM1181A Typical Operating Circuit
Rev. C | Page 5 of 16
ADM202E/ADM1181A GENERAL DESCRIPTION
The ADM202E/ADM1181E are rugged RS-232 line drivers/receivers. Step-up voltage converters coupled with levelshifting transmitters and receivers allow RS-232 levels to be developed while operating from a single 5 V supply. Features include low power consumption, high transmission rates, and compliance with the EU directive on electromagnetic compatibility. EM compatibility includes protection against radiated and conducted interference, including high levels of electrostatic discharge. All inputs and outputs contain protection against electrostatic discharges of up to 15 kV and electrical fast transients of up to 2 kV. This ensures compliance to IEC1000-4-2 and IEC1000-4-4 requirements. The devices are ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently being plugged/unplugged. They are also immune to high RF field strengths without special shielding precautions. CMOS technology is used to minimize the power dissipation, allowing maximum battery life in portable applications. The ADM202E/ADM1181A serve as a modification, enhancement, and improvement to the ADM230-ADM241 family and its derivatives. It is essentially plug-in compatible and do not have materially different applications. desired, larger capacitors (up to 47 F) can be used for Capacitor C1 to Capacitor C4. This facilitates direct substitution with older generation charge-pump RS-232 transceivers.
VCC
S1 C1 S2
S3 V+ = 2VCC C3 S4 VCC
GND
NOTE: C3 CONNECTS BETWEEN V+ AND GND ON THE ADM1181A
Figure 6. Charge-Pump Voltage Doubler
S1 V+ FROM VOLTAGE DOUBLER GND C2 S2
S3 GND C4 S4 V- = -(V+)
00066-006
00066-007
INTERNAL OSCILLATOR
INTERNAL OSCILLATOR
Figure 7. Charge-Pump Voltage Inverter
Transmitter (Driver) Section
The drivers convert 5 V logic input levels into RS-232 output levels. When driving an RS-232 load with VCC = 5 V, the output voltage swing is typically 9 V.
CIRCUIT DESCRIPTION
The internal circuitry consists of four main sections: * * * * A charge-pump voltage converter 5 V logic to EIA-232 transmitters EIA-232 to 5 V logic receivers. Transient protection circuit on all I/O lines
Receiver Section
The receivers are inverting level shifters that accept RS-232 input levels and translate them into 5 V logic output levels. The inputs have internal 5 k pull-down resistors to ground and are also protected against overvoltages of up to 30 V. Unconnected inputs are pulled to 0 V by the internal 5 k pull-down resistor. Therefore, unconnected inputs and those connected to GND have a Logic 1 output level. 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.
Charge-Pump DC-to-DC Voltage Converter
The charge-pump voltage converter consists of a 200 kHz 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 Figure 6 and Figure 7. 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. Capacitor C3 and Capacitor C4 are used to reduce the output ripple. Their values are not critical and can be increased if desired. On the ADM202E, Capacitor C3 is shown connected between V+ and VCC, whereas it is connected between V+ and GND on the ADM1181A. It is acceptable to use either configuration with both the ADM202E and ADM1181A. If
HIGH BAUD RATE
The ADM202E/ADM1181A feature high slew rates, permitting data transmission at rates well in excess of the EIA/RS-232-E specifications. RS-232 voltage levels are maintained at data rates of up to 230 kbps, even under worst case loading conditions. This allows for high speed data links between two terminals and is also suitable for the new generation ISDN modem standards, which require data rates of 230 kbps. The slew rate is internally controlled to less than 30 V/s to minimize EMI interference.
Rev. C | Page 6 of 16
ADM202E/ADM1181A
ESD/EFT TRANSIENT PROTECTION SCHEME
The ADM202E/ADM1181A use protective clamping structures on all inputs and outputs to clamp the voltage to a safe level and dissipate the energy present in electrostatic (ESD) and electrical fast transients (EFT) discharges. A simplified schematic of the protection structure is shown in Figure 8 and Figure 9. Each input and output contains two back-to-back high speed clamping diodes. During normal operation with maximum RS-232 signal levels, the diodes have no effect because one or the other is reverse biased depending on the polarity of the signal. However, if the voltage exceeds about 50 V in either direction, reverse breakdown occurs and the voltage is clamped at this level. The diodes are large p-n junctions that are designed to handle instantaneous current surges that exceed several amperes. The transmitter outputs and receiver inputs have a similar protection structure. The receiver inputs can dissipate some of the energy through the internal 5 k resistor to GND, as well as through the protection diodes. The protection structure achieves ESD protection up to 15 kV and EFT protection up to 2 kV on all RS-232 I/O lines. The methods used to test the protection scheme are discussed in the ESD Testing (IEC1000-4-2) and Fast Transient/Burst Testing (IEC1000-4-4) sections.
RECEIVER INPUT R1 D1 D2
00066-008
RX RIN
Figure 8. Receiver Input Protection Scheme
RX D1 D2
TOUT
TRANSMITTER OUTPUT
Figure 9. Transmitter Output Protection Scheme
Rev. C | Page 7 of 16
00066-009
ADM202E/ADM1181A TYPICAL PERFORMANCE CHARACTERISTICS
15
80 70 60 50
TX O/P HI 10 TX O/P HI LOADED 5
TX O/P (V)
dBV
0
40 30 20 10
LIMIT
-5 TX O/P LO LOADED -10 TX O/P LO
00066-010
-15
0 START 30.0MHz STOP 200.0MHz
4
4.5 VCC (V)
5
5.5
Figure 10. EMC Radiated Emissions
Figure 13. Transmitter Output Voltage High/Low vs. VCC
15
80 70 60 50
dBV 10
LIMIT
5
V+, V- (V)
0
40 30 20 10
00066-011
-5
-10
0
0
5
10
15 ILOAD (mA)
20
25
30
0.3
0.6
1 3 6 LOG FREQUENCY (MHz)
10
30
Figure 11. EMC Conducted Emissions
Figure 14. Charge Pump V+ and V- vs. Current
9 7
15
115KBPS 230KBPS
10 TX O/P HI
5 3
TX O/P (V)
460KBPS
5
1 -1 -3 -5 -7 -9 0 500 1000 1500 2000 LOAD CAPACITANCE (pF) 2500 3000 460KBPS 230KBPS 115KBPS
00066-012
TX O/P (V)
0
-5
TX O/P LO
-10
0
2
4
6 8 ILOAD (mA)
10
12
14
Figure 12. Transmitter Output Voltage High/Low vs. Load Capacitance @ 115 kbps, 230 kbps, and 460 kbps
Figure 15. Transmitter Output Voltage Low/High vs. Load Current
Rev. C | Page 8 of 16
00066-015
-15
00066-014
-15
00066-013
ADM202E/ADM1181A
300
250
1
T
V-
IMPEDANCE ()
200
150 V+ 100
2
T
50
00066-016
4.5
Ch1
5.00V
Ch2
5.00V
M 2.00s
Ch1
-400mV
5.0 VCC (V)
5.5
6.0
Figure 16. 230 kbps Data Transmission
Figure 17. Charge-Pump Impedance vs. VCC
Rev. C | Page 9 of 16
00066-017
0 4.0
ADM202E/ADM1181A
ESD TESTING (IEC1000-4-2)
IEC1000-4-2 (previously 801-2) specifies compliance testing using two coupling methods, contact discharge and air-gap discharge. Contact discharge calls for a direct connection to the unit being tested. Air-gap discharge uses a higher test voltage, but does not make direct contact with the unit being tested. With air-gap discharge, the discharge gun is moved toward the unit being tested, developing an arc across the air gap. This method is influenced by humidity, temperature, barometric pressure, distance, and rate of closure of the discharge gun. Although less realistic, the contact-discharge method is more repeatable and is gaining preference to the air-gap method. Although very little energy is contained within an ESD pulse, the extremely fast rise time coupled with high voltages can cause failures in unprotected semiconductors. Catastrophic destruction can occur immediately as a result of arcing or heating. Even if catastrophic failure does not occur immediately, the device might suffer from parametric degradation, which can result in degraded performance. The cumulative effects of continuous exposure can eventually lead to complete failure. I/O lines are particularly vulnerable to ESD damage. Simply touching or plugging in an I/O cable can result in a static discharge, which can damage or completely destroy the interface product connected to the I/O port. Traditional ESD test methods, such as the MIL-STD-883B method 3015.7, do not fully test a product's susceptibility to this type of discharge. This test was intended to test a product's susceptibility to ESD damage during handling. Each pin is tested with respect to all other pins. There are some important differences between the traditional test and the IEC test: * * * The IEC test is much more stringent in terms of discharge energy. The injected peak current is over four times greater. The current rise time is significantly faster in the IEC test. The IEC test is carried out while power is applied to the device.
HIGH VOLTAGE GENERATOR R1 R2 DEVICE UNDER TEST
C1
ESD TEST METHOD H. BODY MIL-STD883B IEC1000-4-2
R2 1.5k 330
C1 100pF 150pF
00066-018
Figure 18. ESD Test Standards
100 90
IPEAK (%)
36.8
tRL
tDL
TIME t
Figure 19. Human Body Model ESD Current Waveform
100 90
IPEAK (%)
10
00066-020
0.1 TO 1ns 30ns 60ns
TIME t
Figure 20. IEC1000-4-2 ESD Current Waveform
It is possible that the ESD discharge could induce latch-up in the device being tested. Therefore, this test is more representative of a real-world I/O discharge where the equipment is operating normally with power applied. For peace of mind, however, both tests should be performed to ensure maximum protection during both handling and field service.
The ADM202E/ADM1181E products are tested using both of the previously mentioned test methods. Pins are tested with respect to all other pins as per the MIL-STD-883B specification. In addition, I/O pins are tested as per the IEC test specification. The products were tested under the following conditions: * Power-On * Power-Off There are four levels of compliance defined by IEC1000-4-2. The ADM202E/ADM1181A products meet the most stringent level of compliance both for contact and for air-gap discharge. This means that the products are able to withstand contact discharges in excess of 8 kV and air-gap discharges in excess of 15 kV.
Rev. C | Page 10 of 16
00066-019
10
ADM202E/ADM1181A
Table 4. IEC1000-4-2 Compliance Levels
Level 1 2 3 4 Contact Discharge 2 kV 4 kV 6 kV 8 kV Air Discharge 2 kV 4 kV 8 kV 15 kV
A simplified circuit diagram of the actual EFT generator is illustrated in Figure 22. The transients are coupled onto the signal lines using an EFT coupling clamp. The clamp, which is 1 m long, completely surrounds the cable, providing maximum coupling capacitance (50 pF to 200 pF typ) between the clamp and the cable. High energy transients are capacitively coupled to the signal lines. Fast rise times (5 ns), as specified by the standard, result in very effective coupling. This test is very strenuous because high voltages are coupled onto the signal lines. The repetitive transients often cause problems where single pulses do not. Destructive latch-up can be induced due to the high energy content of the transients. Note that this stress is applied while the interface products are powered up and transmitting data. The EFT test applies hundreds of pulses with higher energy than ESD. Worst-case transient current on an I/O line can be as high as 40 A.
HIGH VOLTAGE SOURCE RC CC L ZS
00066-022
Table 5. ADM202E/ADM1181A ESD Test Results
ESD Test Method MIL-STD-883B IEC1000-4-2 Contact Air I/O Pins 15 kV 8 kV 15 kV
FAST TRANSIENT/BURST TESTING (IEC1000-4-4)
IEC1000-4-4 (previously 801-4) covers electrical fast transient (EFT)/burst immunity. Electrical fast transients occur as a result of arcing contacts in switches and relays. The tests simulate the interference generated when, for example, a power relay disconnects an inductive load. A spark is generated due to the well-known back EMF effect. In fact, the spark consists of a burst of sparks as the relay contacts separate. The voltage appearing on the line, therefore, consists of a burst of extremely fast transient impulses. A similar effect occurs when switching on fluorescent lights. The fast transient/burst test defined in IEC1000-4-4 simulates this arcing, and its waveform is illustrated in Figure 17. It consists of a burst of 2.5 kHz to 5 kHz transients repeating at 300 ms intervals. It is specified for both power and data lines.
V
RM
CD 50 OUTPUT
Figure 22. IEC1000-4-4 Fast Transient Generator
Test results are classified according to the following: * * * Classification 1: Normal performance within specification limits Classification 2: Temporary degradation or loss of performance that is self-recoverable Classification 3: Temporary degradation or loss of function or performance that requires operator intervention or system reset Classification 4: Degradation or loss of function that is not recoverable due to damage
*
t
300ms V 5ns 15ms
50ns
The ADM202E/ADM1181A meet Classification 2 and have been tested under worst-case conditions using unshielded cables. Data transmission during the transient condition is corrupted, but can resume immediately following the EFT event without user intervention.
00066-021
t
0.2/0.4ms
Figure 21. IEC1000-4-4 Fast Transient Waveform
Rev. C | Page 11 of 16
ADM202E/ADM1181A
IEC1000-4-3 RADIATED IMMUNITY
IEC1000-4-3 (previously IEC801-3) describes the measurement method and defines the levels of immunity to radiated electromagnetic fields. It was originally intended to simulate the electromagnetic fields generated by portable radio transceivers and other devices that generate continuous wave-radiated electromagnetic energy. Its scope has since been broadened to include spurious EM energy, which can be radiated from fluorescent lights, thyristor drives, inductive loads, and other sources. Testing for immunity involves irradiating the device with an EM field. There are various methods of achieving this, including use of anechoic chamber, stripline cell, TEM cell, and GTEM cell. A stripline cell consists of two parallel plates with an electric field developed between them. The device being tested is placed within the cell and exposed to the electric field. There are three severity levels that have field strengths ranging from 1 V to 10 V/m. Results are classified in a similar fashion to those for IEC1000-4-2. * * Classification 1: Normal operation Classification 2: Temporary degradation or loss of function that is self-recoverable when the interfering signal is removed Classification 3: Temporary degradation or loss of function that requires operator intervention or system reset when the interfering signal is removed Classification 4: Degradation or loss of function that is not recoverable due to damage
CONDUCTED EMISSIONS
Conducted emissions is a measure of noise conducted onto the mains power supply. Switching transients from the charge pump that are 20 V in magnitude and that contain significant energy can lead to conducted emissions. Another source of conducted emissions is the overlap in switch-on times in the charge-pump voltage converter. In the voltage doubler shown in Figure 23, if S2 is not fully turned off before S4 turns on, a transient current glitch occurs between VCC and GND that results in conducted emissions. Therefore, it is important that the switches in the charge pump guarantee break-before-make switching under all conditions to prevent instantaneous short-circuit conditions. The ADM202E is designed to minimize the switching transients and ensure break-before-make switching, thereby minimizing conducted emissions. This results in emission levels well below the specified limits. No additional filtering or decoupling, other than the recommended 0.1 F capacitor, is required. Conducted emissions are measured by monitoring the mains line. The equipment used consists of a spectrum analyzer and a LISN (line impedance stabilizing network) that essentially presents a fixed impedance at RF. The spectrum analyzer scans for emissions of up to 30 MHz; a plot for the ADM202E is shown in Figure 25.
*
VCC
S1 C1 S2
S3 V+ = 2VCC C3 S4 VCC
*
GND
INTERNAL OSCILLATOR
The ADM202E/ADM1181A products easily meet Classification 1 at the most stringent (Level 3) requirement. In fact, field strengths of up to 30 V/m showed no performance degradation, and errorfree data transmission continued even during irradiation.
1
Figure 23. Charge-Pump Voltage Doubler
Table 6. Test Severity Levels (IEC1000-4-3)
Level 1 2 3 Field Strength V/m 1 3 10
2 SWITCHING GLITCHES
EMISSIONS/INTERFERENCE
EN55 022 and CISPR22 define the permitted limits of radiated and conducted interference from information technology (IT) equipment. The objective of the standard is to minimize the level of emissions, both conducted and radiated. For ease of measurement and analysis, conducted emissions are assumed to predominate below 30 MHz, and radiated emissions are assumed to predominate above 30 MHz.
Rev. C | Page 12 of 16
Figure 24. Switching Glitches
00066-024
00066-023
ADM202E/ADM1181A
80 70 60 50 LIMIT
was operated at maximum baud rates and configured like a typical RS-232 interface. Testing for radiated emissions was carried out in a shielded anechoic chamber.
dBV
RADIATED NOISE 40 30 DUT 20 TURNTABLE 10 0
00066-025
ADJUSTABLE ANTENNA
TO RECEIVER
0.3
0.6
3 6 1 LOG FREQUENCY (MHz)
10
30
Figure 25. ADM202E Conducted Emissions
Figure 26. Radiated Emissions Test Setup
RADIATED EMISSIONS
Radiated emissions are measured at frequencies in excess of 30 MHz. RS-232 outputs are designed for operation at high baud rates, while driving cables can radiate high frequency EM energy. The previously described causes of conducted emissions can also cause radiated emissions. Fast RS-232 output transitions can radiate interference, especially when lightly loaded and driving unshielded cables. Charge-pump devices are also prone to radiating noise due to the high frequency oscillator and the high voltages being switched by the charge pump. The move toward smaller capacitors to conserve board space has resulted in higher frequency oscillators in the charge-pump design, causing higher levels of conducted and radiated emissions. The RS-232 outputs on the ADM202E feature a controlled slew rate to minimize the level of radiated emissions, yet they are fast enough to support data rates of up to 230 kBaud. Figure 27 shows radiated emissions vs. frequency. The levels of emissions are well within specifications without the need for additional shielding or filtering components. The ADM202E
80 70 60 50
dBV
40 30 20 10 0 START 30.0MHz STOP 200.0MHz
LIMIT
00066-026
Figure 27. ADM202E Radiated Emissions vs. Frequency
Rev. C | Page 13 of 16
00066-027
ADM202E/ADM1181A OUTLINE DIMENSIONS
10.50 (0.4134) 10.10 (0.3976)
5.10 5.00 4.90
9
16
7.60 (0.2992) 7.40 (0.2913)
1 8
16
9
10.65 (0.4193) 10.00 (0.3937)
4.50 4.40 4.30
1 8
6.40 BSC
1.27 (0.0500) BSC 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122)
2.65 (0.1043) 2.35 (0.0925)
0.75 (0.0295) x 45 0.25 (0.0098)
PIN 1 1.20 MAX 0.20 0.09 0.65 BSC 0.30 0.19 COPLANARITY 0.10 SEATING PLANE 8 0 0.75 0.60 0.45
SEATING PLANE
8 0.33 (0.0130) 0 0.20 (0.0079)
0.15 0.05
1.27 (0.0500) 0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-013AA 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 MO-153AB
Figure 28. 16-Lead Standard Small Outline Package [SOIC] Wide Body (RW-16) Dimensions shown in millimeters and (inches)
Figure 30. 16-Lead Thin Shrink Small Outline Package [TSSOP] (RU-16) Dimensions shown in millimeters
0.785 (19.94) 0.765 (19.43) 0.745 (18.92)
10.00 (0.3937) 9.80 (0.3858)
16 1 9 8
16 1
9 8
0.295 (7.49) 0.285 (7.24) 0.275 (6.99)
4.00 (0.1575) 3.80 (0.1496)
6.20 (0.2441) 5.80 (0.2283)
0.100 (2.54) BSC 0.015 (0.38) MIN
0.50 (0.0197) x 45 0.25 (0.0098)
0.325 (8.26) 0.310 (7.87) 0.300 (7.62)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10
1.75 (0.0689) 1.35 (0.0531)
0.180 (4.57) MAX 0.150 (3.81) 0.130 (3.30) 0.110 (2.79)
0.150 (3.81) 0.135 (3.43) 0.120 (3.05)
8 0.51 (0.0201) SEATING 0.25 (0.0098) 0 1.27 (0.0500) PLANE 0.31 (0.0122) 0.40 (0.0157) 0.17 (0.0067)
0.022 (0.56) 0.018 (0.46) 0.014 (0.36)
0.060 (1.52) 0.050 (1.27) 0.045 (1.14)
SEATING PLANE
0.015 (0.38) 0.010 (0.25) 0.008 (0.20)
COMPLIANT TO JEDEC STANDARDS MS-012AC 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 MO-095AC 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 29. 16-Lead Standard Small Outline Package [SOIC] Narrow Body (R-16) Dimensions shown in millimeters and (inches)
Figure 31. 16-Lead Plastic Dual In-Line Package [PDIP] (N-16) Dimensions shown in inches and (millimeters)
Rev. C | Page 14 of 16
ADM202E/ADM1181A
ORDERING GUIDE
Model ADM202EAN ADM202EANZ1 ADM202EARW ADM202EARW-REEL ADM202EARWZ1 ADM202EARWZ-REEL1 ADM202EARN ADM202EARN-REEL ADM202EARN-REEL7 ADM202EARNZ1 ADM202EARNZ-REEL1 ADM202EARNZ-REEL71 ADM202EARU ADM202EARU-REEL ADM202EARU-REEL7 ADM202EARUZ1 ADM202EARUZ-REEL1 ADM202EARUZ-REEL71 ADM1181AAN ADM1181AARW ADM1181AARW-REEL ADM1181AARWZ1 ADM1181AARWZ-REEL1 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description Plastic DIP Plastic DIP Wide SOIC Wide SOIC Wide SOIC Wide SOIC Narrow SOIC Narrow SOIC Narrow SOIC Narrow SOIC Narrow SOIC Narrow SOIC TSSOP TSSOP TSSOP TSSOP TSSOP TSSOP Plastic DIP Wide SOIC Wide SOIC Wide SOIC Wide SOIC Package Option N-16 N-16 R-16W R-16W R-16W R-16W R-16N R-16N R-16N R-16N R-16N R-16N RU-16 RU-16 RU-16 RU-16 RU-16 RU-16 N-16 R-16W R-16W R-16W R-16W
1
Z = Pb-free part.
Rev. C | Page 15 of 16
ADM202E/ADM1181A NOTES
(c) 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00066-0-2/05(C)
Rev. C | Page 16 of 16

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