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| 15 kV ESD Protected, 3.3 V, RS-232 Line Driver/Receiver ADM3232E FEATURES Data rate: 460 kbps 2 Tx and 2 Rx Meets EIA-232E specifications 0.1 F charge pump capacitors ESD protection to IEC1000-4-2 (801.2) on TTL/CMOS and RS-232 I/Os Contact discharge: 8 kV Air gap discharge: 15 kV FUNCTIONAL BLOCK DIAGRAM +3.3V INPUT ADM3232E C3 0.1F 6.3V C4 0.1F 10V + + + 0.1F + 10V 0.1F + 10V T1IN TTL/CMOS INPUTS T2IN R1OUT TTL/CMOS OUTPUTS R2OUT GND *INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. 06410-001 C1+ +3.3V TO +6.6V VCC VOLTAGE C1- V+ DOUBLER C2+ +6.6V TO -6.6V VOLTAGE C2- INVERTER T1 V- C5 0.1F T1OUT RS-232 OUTPUTS APPLICATIONS General-purpose RS-232 data link Portable instruments Handsets Industrial/telecom diagnostic ports T2 R1 5k R2 5k T2OUT R1IN RS-232 INPUTS* R2IN Figure 1. GENERAL DESCRIPTION The ADM3232E transceiver is a high speed, 2-channel RS-232/V.28 interface device that operates from a single 3.3 V power supply. Low power consumption makes it ideal for battery-powered portable instruments. The ADM3232E conforms to the EIA-232E and CCITT V.28 specifications and operates at data rates up to 460 kbps. All RS-232 (T_OUT and R_IN) and TTL/CMOS (T_IN and R_OUT) inputs and outputs are protected against electrostatic discharges (up to 15 kV ESD protection). This ensures compliance with IEC 1000-4-2 requirements. This device is ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently plugged/ unplugged, with the 15 kV ESD protection of the ADM3232E input/output pins. Emissions are also controlled to within very strict limits. CMOS technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. Four external 0.1 F charge pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 3.3 V supply. The ADM3232E is available in a 16-lead narrow SOIC package, as well as a space-saving 16-lead TSSOP. Rev. 0 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: 781.461.3113 (c)2006 Analog Devices, Inc. All rights reserved. ADM3232E TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions..............................5 Typical Performance Characteristics ..............................................6 Theory of Operation .........................................................................8 Circuit Description .......................................................................8 High Baud Rate..............................................................................8 Outline Dimensions ..........................................................................9 Ordering Guide .............................................................................9 REVISION HISTORY 12/06--Revision 0: Initial Version Rev. 0 | Page 2 of 12 ADM3232E SPECIFICATIONS VCC = 3.3 V 0.3 V, 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 TTL/CMOS Output Voltage Low, VOL TTLCMOS Output Voltage High, VOH Logic Pull-Up Current Transmitter Input Hysteresis RS-232 RECEIVER Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance RS-232 TRANSMITTER Output Voltage Swing (RS-232) Output Voltage Swing (RS-562) Transmitter Output Resistance Output Short-Circuit Current (RS-232) TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay TPHL TPLH Transmitter Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew Transition Region Slew Rate ESD PROTECTION (RS-232 and TTL/CMOS I/O PINS) 15 15 8 kV kV kV Human body model IEC 1000-4-2 air discharge IEC 1000-4-2 contact discharge Min 3.0 Typ 3.3 1.3 Max 5.5 3 0.8 2.0 0.4 VCC - 0.6 5 0.5 -30 0.6 10 Unit V mA V V V V A V V V V V k V V mA VCC = 3.3 V, all transmitter outputs loaded with 3 k to ground VCC = 3.0 V VCC = 0 V, VOUT = 2 V Test Conditions/Comments No load TIN TIN IOUT = 1.6 mA IOUT = -1 mA TIN = GND to VCC +30 1.2 1.6 0.4 5 5.2 2.4 7 3 5.0 3.7 300 15 460 kbps VCC = 3.3 V, RL = 3 k to 7 k, CL = 50 pF to 1000 pF, one Tx switching 5.5 0.4 0.4 300 200 200 30 300 10 1 1 1.2 30 s s s ns ns ns ns V/s RL = 3 k, CL = 1000 pF Measured from +3 V to -3 V or -3 V to +3 V, VCC = 3.3 V; RL = 3 k, CL = 1000 pF, TA = 25C Rev. 0 | Page 3 of 12 ADM3232E ABSOLUTE MAXIMUM RATINGS TA = 25C, unless otherwise noted. Table 2. Parameter VCC V+ V- Input Voltages T_IN R_IN Output Voltages T_OUT R_OUT Short-Circuit Duration T_OUT 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) Rating -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 158C/W 500 mW 158C/W -40C to +85C -65C to +150C JEDEC industry-standard J-STD-020 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD CAUTION Rev. 0 | Page 4 of 12 ADM3232E PIN CONFIGURATION AND FUNCTION DESCRIPTIONS C1+ V+ C1- C2+ C2- V- T2OUT R2IN 1 2 3 4 5 6 7 8 16 15 VCC GND T1OUT R1IN R1OUT T1IN 06410-002 ADM3232E TOP VIEW (Not to Scale) 14 13 12 11 10 9 T2IN R2OUT Figure 2. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1, 3 2 4, 5 6 7, 14 8, 13 9, 12 10, 11 15 16 Mnemonic C1+, C1- V+ C2+, C2- V- T_OUT R_IN R_OUT T_IN GND VCC Description 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. Internally Generated Positive Supply (6 V Nominal). 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. Internally Generated Negative Supply (-6 V Nominal). Transmitter (Driver) Outputs. These are RS-232 signal levels (typically 6 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 output logic levels. Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. Ground Pin. Must be connected to 0 V. Power Supply Input (3.3 V 0.3 V). Rev. 0 | Page 5 of 12 ADM3232E TYPICAL PERFORMANCE CHARACTERISTICS 8 6 4 2 T_OUT (HIGH) 8 6 V+ 4 2 V+, V- (V) T_OUT (V) 0 -2 -4 -6 -8 T_OUT (LOW) 0 -2 -4 -6 V- 06410-003 0 200 400 600 800 LOAD CAPACITANCE (pF) 1000 1200 0 2 4 6 8 LOAD CURRENT (mA) 10 12 Figure 3. Transmitter Output Voltage High/Low vs. Load Capacitance @ 460 kbps 8 6 4 2 T_OUT (V) Figure 6. Charge Pump V+, V- vs. Load Current 350 T_OUT HIGH 300 V+ (IMPEDANCE) 250 IMPEDANCE () 200 V- (IMPEDANCE) 150 100 0 -2 -4 -6 06410-004 T_OUT LOW 50 0 2.7 2.9 3.1 VCC (V) 3.3 3.5 2.9 3.1 VCC (V) 3.3 3.5 Figure 4. Transmitter Output Voltage vs. VCC 8 6 4 2 ICC (mA) Figure 7. Charge Pump Impedance vs. VCC 20 18 T_OUT HIGH 16 14 ICC @ 460kbps T_OUT (V) 12 10 8 6 ICC @ 230kbps 0 -2 -4 T_OUT LOW -6 06410-005 4 2 0 2 4 6 8 LOAD CURRENT (mA) 10 12 0 1000 2000 LOAD CAPACITANCE (pF) 3000 Figure 5. Transmitter Output Voltage High/Low vs. Load Current Figure 8. Power Supply Current vs. Load Capacitance Rev. 0 | Page 6 of 12 06410-008 -8 0 06410-007 -8 2.7 06410-006 -8 ADM3232E 1 T T 2 CH 1 5.00V CH 2 5.00V M1.00s CH1 0V Figure 9. 460 kbps Data Transmission 06410-009 Rev. 0 | Page 7 of 12 ADM3232E THEORY OF OPERATION The ADM3232E is a single-channel RS-232 line driver/receiver. Step-up voltage converters, coupled with level-shifting transmitters and receivers, allow RS-232 levels to be developed while operating from a single 3.3 V supply. CMOS technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. VCC S1 C1 + S4 S3 C3 + V+ = 2VCC S2 GND INTERNAL OSCILLATOR VCC 06410-011 Figure 11. Charge Pump Voltage Doubler CIRCUIT DESCRIPTION The internal circuitry consists of the following main sections: * * * A charge pump voltage converter A 3.3 V logic to RS-232 transmitter An RS-232 to 3.3 V logic receiver FROM VOLTAGE DOUBLER S1 V+ S2 GND INTERNAL OSCILLATOR C2 + S4 C4 + V- = -(V+) 06410-012 S3 GND Charge Pump DC-DC Voltage Converter The charge pump voltage converter consists of a 200 kHz oscillator and a switching matrix. The converter generates a 6.6 V supply from the input 3.3 V level. This is done in two stages by using a switched capacitor technique as shown in Figure 10. First, the 3.3 V input supply is doubled to 6.6 V by using Capacitor C1 as the charge storage element. The +6.6 V level is then inverted to generate -6.6 V, using C2 as the storage element. C3 is shown connected between V+ and VCC, but it is equally effective if connected between V+ and GND. Capacitor C3 and Capacitor C4 are used to reduce the output ripple. Their values are not critical and can be increased, if desired. Capacitor C3 is shown connected between V+ and VCC. It is also acceptable to connect this capacitor between V+ and GND. If desired, larger capacitors (up to 10 F) can be used for Capacitor C1 to Capacitor C4. +3.3V INPUT Figure 12. Charge Pump Voltage Inverter Transmitter (Driver) Section The drivers convert 3.3 V logic input levels into RS-232 output levels. With VCC = 3.3 V and driving an RS-232 load, the output voltage swing is typically 6 V. Receiver Section The receivers are inverting level-shifters that accept RS-232 input levels and translate them into 3 V logic output levels. The inputs have internal 5 k pull-down resistors to ground and are also protected against overvoltages up to 30 V. Unconnected inputs are pulled to 0 V by the internal 5 k pull-down resistor. This results in a Logic 1 output level for unconnected inputs or for inputs connected to GND. The receivers have Schmitt trigger inputs with a hysteresis level of 0.4 V. This ensures error-free reception for both noisy inputs and for inputs with slow transition times. ADM3232E C3 0.1F 6.3V C4 0.1F 10V + + + 0.1F + 10V 0.1F + 10V T1IN TTL/CMOS INPUTS T2IN R1OUT TTL/CMOS OUTPUTS R2OUT GND *INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. 06410-010 ESD Protection on RS-232 and TTL/CMOS I/O Pins C5 0.1F C1+ +3.3V TO +6.6V VCC VOLTAGE C1- V+ DOUBLER C2+ +6.6V TO -6.6V VOLTAGE C2- INVERTER T1 V- All RS-232 (T_OUT and R_IN) and TTL/CMOS (T_IN and R_OUT) inputs and outputs are protected against electrostatic discharges (up to 15 kV). This ensures compliance with IEC 1000-4-2 requirements. T1OUT RS-232 OUTPUTS HIGH BAUD RATE The ADM3232E features high slew rates, permitting data transmission at rates well in excess of the EIA-232E specifications. RS-232 voltage levels are maintained at data rates up to 460 kbps, even under worst-case loading conditions. This allows high speed data links between two terminals and is suitable for the new generation ISDN modem standards that require data rates of 230 kbps. The slew rate is internally controlled to less than 30 V/s to minimize EMI interference. T2 R1 5k R2 5k T2OUT R1IN RS-232 INPUTS* R2IN Figure 10. Typical Operating Circuit Rev. 0 | Page 8 of 12 ADM3232E OUTLINE DIMENSIONS 10.00 (0.3937) 9.80 (0.3858) 16 1 9 8 4.00 (0.1575) 3.80 (0.1496) 6.20 (0.2441) 5.80 (0.2283) 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) SEATING PLANE 0.50 (0.0197) 0.25 (0.0098) 8 0 1.27 (0.0500) 0.40 (0.0157) 45 0.25 (0.0098) 0.17 (0.0067) COMPLIANT TO JEDEC STANDARDS MS-012-AC 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. 060606-A Figure 13. 16-Lead Standard Small Outline Package [SOIC_N] Narrow Body (RN-16) Dimensions shown in millimeters (and inches) 5.10 5.00 4.90 16 9 4.50 4.40 4.30 1 8 6.40 BSC PIN 1 0.15 0.05 0.65 BSC 0.30 0.19 COPLANARITY 0.10 1.20 MAX 0.20 0.09 SEATING PLANE 8 0 0.75 0.60 0.45 COMPLIANT TO JEDEC STANDARDS MO-153-AB Figure 14. 16-Lead Thin Shrink Small Outline Package [TSSOP] (RU-16) Dimensions shown in millimeters ORDERING GUIDE Model ADM3232EARNZ 1 ADM3232EARNZ-REEL71 ADM3232EARUZ1 ADM3232EARUZ-REEL71 1 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 16-Lead SOIC_N 16-Lead SOIC_N 16-Lead TSSOP 16-Lead TSSOP Package Option RN-16 RN-16 RU-16 RU-16 Z = Pb-free part. Rev. 0 | Page 9 of 12 ADM3232E NOTES Rev. 0 | Page 10 of 12 ADM3232E NOTES Rev. 0 | Page 11 of 12 ADM3232E NOTES (c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06410-0-12/06(0) T T Rev. 0 | Page 12 of 12 |
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