EMI/EMC-Compliant, ±15 kV, ESD-Protected RS-232 Line Drivers/Receivers ADM202E/ADM1181A FEATURES 5V INPUT CMOS INPUTS CMOS OUTPUTS APPLICATIONS General-purpose RS-232 data link Portable instruments PDAs 0.1µF 10V C1+ 0.1µF 10V C2+ C1– C2– +5V TO +10V V CC VOLTAGE V+ DOUBLER +10V TO –10V V– VOLTAGE INVERTER C3 0.1µF 6.3V C5 0.1µF C4 0.1µF 10V T1IN T1 T1OUT T2IN T2 T2OUT R1OUT R1 R1IN R2OUT R2 R2IN EIA/TIA-232 OUTPUTS EIA/TIA-232 INPUTS* ADM202E GND *INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT 00066-001 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 Figure 1. 5V INPUT 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. CMOS INPUTS CMOS OUTPUTS 0.1µF 10V C1+ 0.1µF 10V C2+ +10V TO –10V V– VOLTAGE C2– INVERTER C1– C4 0.1µF 10V T1IN T1 T1OUT T2IN T2 T2OUT R1OUT R1 R2OUT R2 GND C5 0.1µF C3 10V 0.1µF 10V EIA/TIA-232 OUTPUTS R1IN R2IN EIA/TIA-232 INPUTS* ADM1181A *INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT 00066-002 GENERAL DESCRIPTION +5V TO +10V V CC VOLTAGE V+ DOUBLER Figure 2. The ADM202E and ADM1181A conform to the EIA-232E and CCITT V.28 specifications and operate at data rates up to 230 kbps. 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. Four external 0.1 µF charge-pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 5 V supply. 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 © 2005 Analog Devices, Inc. All rights reserved. ADM202E/ADM1181A TABLE OF CONTENTS Specifications..................................................................................... 3 Typical Performance Characteristics ..............................................8 Absolute Maximum Ratings............................................................ 4 ESD Testing (IEC1000-4-2) ...................................................... 10 ESD Caution.................................................................................. 4 Fast Transient/Burst Testing (IEC1000-4-4)........................... 11 Pin Configuration and Function Descriptions............................. 5 IEC1000-4-3 Radiated Immunity ............................................ 12 General Description ......................................................................... 6 Emissions/Interference .............................................................. 12 Circuit Description....................................................................... 6 Conducted Emissions ................................................................ 12 Charge-Pump DC-to-DC Voltage Converter....................... 6 Radiated Emissions .................................................................... 13 Transmitter (Driver) Section .................................................. 6 Outline Dimensions ....................................................................... 14 Receiver Section ....................................................................... 6 Ordering Guide .......................................................................... 15 High Baud Rate............................................................................. 6 ESD/EFT Transient Protection Scheme .................................... 7 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 µF. All specifications TMIN to TMAX, unless otherwise noted. Table 1. Parameter Min Typ Max Unit Test Conditions/Comments DC CHARACTERISTICS Operating Voltage Range VCC Power Supply Current 4.5 5.0 2.5 13 5.5 6.0 18 V mA mA No load RL = 3 kΩ to GND 0.8 V V V V µA TIN TIN IOUT = 3.2 mA IOUT = −1 mA TIN = 0 V V V V V kΩ TA = 0°C to 85°C 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) EFT Protection (I/O Pins) EMI Immunity 2.4 0.4 3.5 +12 −30 0.4 ±25 +30 3 1.2 1.6 0.65 5 ±5.0 ±9.0 2.4 7 V 300 ±10 ±60 230 3 Ω mA kbps 0.1 0.3 1.0 8 1 1 1.5 30 ±15 ±15 ±8 kV ±2 10 Rev. C | Page 3 of 16 µs µs µs V/µs kV kV kV kV V/m All transmitter outputs loaded with 3 kΩ to ground VCC = 0 V, VOUT = ±2 V RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF RL = 3 kΩ, CL = 1000 pF RL = 3 kΩ, 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 ADM202E/ADM1181A ABSOLUTE MAXIMUM RATINGS TA = 25°C, 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 50°C) θJA, Thermal Impedance Power Dissipation R-16 (Derate 6 mW/°C Above 50°C) θJA, Thermal Impedance Power Dissipation RU-16 (Derate 6 mW/°C Above 50°C) θJA, 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 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. ±15 V –0.3 V to (VCC + 0.3 V) Continuous 450 mW 117°C/W 450 mW 158°C/W 500 mW 158°C/W –40°C to +85°C –65°C to +150°C 300°C ±15 kV ±15 kV ±8 kV ±2 kV 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 16 VCC 15 GND ADM202E 14 T1OUT ADM1181A 13 R1IN TOP VIEW 12 R1OUT (Not to Scale) V– 6 11 T1IN T2OUT 7 R2IN 8 10 T2IN 9 R2OUT 00066-003 C2– 5 Figure 3. Pin Configuration Table 3. Pin Function Descriptions Mnemonic VCC V+ V− GND C1+, C1− 4, 5 C2+, C2− 10, 11 7, 14 8, 13 TIN TOUT RIN 9, 12 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 µF capacitor is recommended, but larger capacitors of up to 47 µF can be used. External Capacitor 2 is connected between these pins. A 0.1 µF capacitor is recommended, but larger capacitors of up to 47 µF 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 kΩ pull-down resistor to GND is connected on each input. Receiver Outputs. These are CMOS output logic levels. 5V INPUT 5V INPUT 0.1µF 10V T1IN CMOS INPUTS CMOS OUTPUTS 1 C1+ 3 C1– 4 C2+ 5 C2– 11 T2IN 10 R1OUT 12 R2OUT 9 +5V TO +10V V CC 16 VOLTAGE V+ 2 DOUBLER +10V TO –10V V– 6 VOLTAGE INVERTER 14 T1 T2 7 R1 R2 GND 13 8 C3 0.1µF 6.3V C5 0.1µF C4 0.1µF 10V T1OUT T2OUT R1IN R2IN EIA/TIA-232 OUTPUTS CMOS INPUTS EIA/TIA-232 INPUTS* CMOS OUTPUTS ADM202E 15 *INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT +5V TO +10V V CC 16 VOLTAGE V+ 2 DOUBLER 0.1µF 10V 1 C1+ 0.1µF 10V 4 C2+ +10V TO –10V V– 3 C1– 5 C2– Figure 4. ADM202E Typical Operating Circuit 6 VOLTAGE INVERTER C4 0.1µF 10V T1IN 11 T1 14 T1OUT T2IN 10 T2 7 T2OUT R1OUT 12 R1 13 R1IN R2OUT 9 R2 8 R2IN GND 00066-004 0.1µF 10V C5 0.1µF C3 10V 0.1µF 10V EIA/TIA-232 INPUTS* ADM1181A 15 *INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT Figure 5. ADM1181A Typical Operating Circuit Rev. C | Page 5 of 16 EIA/TIA-232 OUTPUTS 00066-005 Pin No. 16 2 6 15 1, 3 ADM202E/ADM1181A GENERAL DESCRIPTION desired, larger capacitors (up to 47 µF) can be used for Capacitor C1 to Capacitor C4. This facilitates direct substitution with older generation charge-pump RS-232 transceivers. 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. VCC V+ = 2VCC C3 C1 S2 S4 VCC GND INTERNAL OSCILLATOR NOTE: C3 CONNECTS BETWEEN V+ AND GND ON THE ADM1181A Figure 6. Charge-Pump Voltage Doubler S3 S1 V+ FROM VOLTAGE DOUBLER GND 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. S3 S1 00066-006 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. GND C4 C2 S2 S4 INTERNAL OSCILLATOR V– = –(V+) 00066-007 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. Figure 7. Charge-Pump Voltage Inverter Transmitter (Driver) Section The internal circuitry consists of four main sections: 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. • A charge-pump voltage converter Receiver Section • 5 V logic to EIA-232 transmitters • EIA-232 to 5 V logic receivers. • Transient protection circuit on all I/O lines 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 kΩ 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 kΩ pull-down resistor. Therefore, unconnected inputs and those connected to GND have a Logic 1 output level. CIRCUIT DESCRIPTION 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 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. 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/µs to minimize EMI interference. Rev. C | Page 6 of 16 ADM202E/ADM1181A ESD/EFT TRANSIENT PROTECTION SCHEME The transmitter outputs and receiver inputs have a similar protection structure. The receiver inputs can dissipate some of the energy through the internal 5 kΩ 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. Rev. C | Page 7 of 16 R1 RECEIVER INPUT RX RIN D1 00066-008 D2 Figure 8. Receiver Input Protection Scheme TOUT RX TRANSMITTER OUTPUT D1 D2 00066-009 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. Figure 9. Transmitter Output Protection Scheme ADM202E/ADM1181A TYPICAL PERFORMANCE CHARACTERISTICS 15 TX O/P HI 80 10 70 TX O/P HI LOADED 60 TX O/P (V) 5 LIMIT 40 0 –5 30 TX O/P LO LOADED 20 –10 TX O/P LO 00066-010 10 0 START 30.0MHz STOP 200.0MHz –15 4 4.5 00066-013 dBµV 50 5.5 5 VCC (V) Figure 10. EMC Radiated Emissions Figure 13. Transmitter Output Voltage High/Low vs. VCC 15 80 10 70 60 LIMIT V+, V– (V) 5 dBµV 50 40 0 –5 30 20 –10 0.3 0.6 1 3 6 LOG FREQUENCY (MHz) 30 10 –15 00066-011 0 0 5 10 15 Figure 11. EMC Conducted Emissions 25 30 Figure 14. Charge Pump V+ and V− vs. Current 15 9 115KBPS 7 10 230KBPS 5 TX O/P HI 5 TX O/P (V) 460KBPS 1 –1 –5 460KBPS –5 230KBPS –7 115KBPS –9 0 500 1000 1500 2000 LOAD CAPACITANCE (pF) 2500 TX O/P LO –10 3000 –15 00066-012 –3 0 Figure 12. Transmitter Output Voltage High/Low vs. Load Capacitance @ 115 kbps, 230 kbps, and 460 kbps Rev. C | Page 8 of 16 0 2 4 6 8 ILOAD (mA) 10 12 14 00066-015 3 TX O/P (V) 20 ILOAD (mA) 00066-014 10 Figure 15. Transmitter Output Voltage Low/High vs. Load Current ADM202E/ADM1181A 300 250 T V– IMPEDANCE (Ω) 1 2 200 150 V+ 100 T 5.00V Ch2 5.00V M 2.00µs Ch1 –400mV 00066-016 Ch1 0 4.0 Figure 16. 230 kbps Data Transmission 4.5 5.0 VCC (V) 5.5 Figure 17. Charge-Pump Impedance vs. VCC Rev. C | Page 9 of 16 6.0 00066-017 50 ADM202E/ADM1181A 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. R1 R2 DEVICE UNDER TEST C1 ESD TEST METHOD R2 C1 H. BODY MIL-STD883B 1.5kΩ 100pF IEC1000-4-2 330Ω 150pF 00066-018 HIGH VOLTAGE GENERATOR ESD TESTING (IEC1000-4-2) Figure 18. ESD Test Standards 100 36.8 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 current rise time is significantly faster in the IEC test. • The IEC test is carried out while power is applied to the device. TIME t Figure 19. Human Body Model ESD Current Waveform 100 IPEAK (%) 90 The IEC test is much more stringent in terms of discharge energy. The injected peak current is over four times greater. • tDL tRL 00066-019 10 10 0.1 TO 1ns TIME t 30ns 60ns 00066-020 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. IPEAK (%) 90 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 ADM202E/ADM1181A A simplified circuit diagram of the actual EFT generator is illustrated in Figure 22. 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 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. 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 CC 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 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. 5ns 50ns t 0.2/0.4ms 50Ω OUTPUT ZS • 00066-021 V CD Test results are classified according to the following: t 15ms RM L Figure 22. IEC1000-4-4 Fast Transient Generator V 300ms RC 00066-022 Table 4. IEC1000-4-2 Compliance Levels Figure 21. IEC1000-4-4 Fast Transient Waveform Rev. C | Page 11 of 16 ADM202E/ADM1181A IEC1000-4-3 RADIATED IMMUNITY CONDUCTED EMISSIONS 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. 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. 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 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. S3 S1 VCC V+ = 2VCC C1 S2 C3 S4 GND Classification 4: Degradation or loss of function that is not recoverable due to damage VCC 00066-023 • 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 µF capacitor, is required. 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. Figure 23. Charge-Pump Voltage Doubler ∅1 Table 6. Test Severity Levels (IEC1000-4-3) Field Strength V/m 1 3 10 ∅2 SWITCHING GLITCHES 00066-024 Level 1 2 3 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 ADM202E/ADM1181A 80 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. 70 60 LIMIT dBµV 50 RADIATED NOISE 40 30 DUT 20 TURNTABLE 0.6 3 6 1 LOG FREQUENCY (MHz) 10 30 Figure 26. Radiated Emissions Test Setup Figure 25. ADM202E Conducted Emissions 80 RADIATED EMISSIONS 70 60 50 dBµV 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 Rev. C | Page 13 of 16 LIMIT 40 30 20 10 0 START 30.0MHz STOP 200.0MHz Figure 27. ADM202E Radiated Emissions vs. Frequency 00066-027 0.3 00066-025 0 TO RECEIVER 00066-026 10 ADJUSTABLE ANTENNA 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) 9 4.50 4.40 4.30 10.65 (0.4193) 10.00 (0.3937) 8 1 16 6.40 BSC 1 1.27 (0.0500) BSC 2.65 (0.1043) 2.35 (0.0925) 0.30 (0.0118) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 8° 0.33 (0.0130) 0° 0.20 (0.0079) 0.75 (0.0295) × 45° 0.25 (0.0098) 8 PIN 1 1.20 MAX 0.15 0.05 1.27 (0.0500) 0.40 (0.0157) 0.20 0.09 0.30 0.19 0.65 BSC 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 COPLANARITY 0.10 SEATING PLANE 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) 4.00 (0.1575) 3.80 (0.1496) 16 9 1 8 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 16 9 1 8 0.295 (7.49) 0.285 (7.24) 0.275 (6.99) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.100 (2.54) BSC 6.20 (0.2441) 5.80 (0.2283) 1.75 (0.0689) 1.35 (0.0531) 0.015 (0.38) MIN 0.50 (0.0197) × 45° 0.25 (0.0098) 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) 0.75 0.60 0.45 8° 0° 0.180 (4.57) MAX 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 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 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) 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 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 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 1 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 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 Z = Pb-free part. Rev. C | Page 15 of 16 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 ADM202E/ADM1181A NOTES © 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