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| a FEATURES 120 kB Transmission Rate ADM202: Small (0.1 F) Charge Pump Capacitors ADM203: No External Capacitors Required Single 5 V Power Supply Meets EIA-232-E and V.28 Specifications Two Drivers and Two Receivers On-Board DC-DC Converters 9 V Output Swing with 5 V Supply Low Power BiCMOS: 2.0 mA ICC 30 V Receiver Input Levels APPLICATIONS Computers Peripherals Modems Printers Instruments High-Speed, 5 V, 0.1 F CMOS RS-232 Driver/Receivers ADM202/ADM203 FUNCTIONAL BLOCK DIAGRAMS 5V INPUT C1+ C1- C2+ C2- +5V TO +10V VOLTAGE DOUBLER +10V TO -10V VOLTAGE INVERTER VCC V+ 0.1 F 6.3V 0.1 F 6.3V 0.1 F 6.3V 0.1 F 16V V- 0.1 F 16V T1OUT RS-232 OUTPUTS T2OUT R1IN RS-232 INPUTS** R2IN T1IN TTL/CMOS INPUTS* T2IN R1OUT TTL/CMOS OUTPUTS R2OUT GND T1 T2 R1 R2 ADM202 GENERAL DESCRIPTION *INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. **INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. 5V INPUT The ADM202/ADM203 is a two-channel RS-232 line driver/ receiver pair designed to operate from a single 5 V power supply. A highly efficient on-chip charge pump design permits RS-232 levels to be developed using charge pump capacitors as small as 0.1 F. The capacitors are internal to the package on the ADM203 so no external capacitors are required. These converters generate 10 V RS-232 output levels. The ADM202/ADM203 meets or exceeds the EIA-232-E and V.28 specifications. Fast driver slew rates permit operation up to 120 kB while high-drive currents allow for extended cable lengths. An epitaxial BiCMOS construction minimizes power consumption to 10 mW and also guards against latch-up. Overvoltage protection is provided allowing the receiver inputs to withstand continuous voltages in excess of 30 V. In addition, all pins contain ESD protection to levels greater than 2 kV. The ADM202 is available in 16-lead DIP and both narrow and wide SOIC packages. The ADM203 is available in a 20-lead DIP package. VCC T1IN TTL/CMOS INPUTS* T2IN R1OUT TTL/CMOS OUTPUTS R2OUT DO NOT MAKE CONNECTIONS TO THESE PINS INTERNAL -10V POWER SUPPLY INTERNAL +10V POWER SUPPLY C1+ C2+ C1- C2+ V- C2- V- V+ R2 R2IN T2 T2OUT R1IN RS-232 INPUTS** T1 T1OUT RS-232 OUTPUTS R1 ADM203 C2- GND GND *INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. **INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. REV. A 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 which 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 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2001 ADM202/ADM203-SPECIFICATIONS T Parameter Output Voltage Swing Output Voltage Swing VCC Power 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 Propagation Delay Transition Region Slew Rate Baud Rate Output Resistance RS-232 Output Short Circuit Current Specifications subject to change without notice. (VCC = 5 V 10%, (ADM202 C1-C4 = 0.1 F). All Specifications MIN to TMAX, unless otherwise noted) Unit V V Conditions/Comments VCC = 5 V 5%, T1OUT, T2OUT Loaded with 3 k to GND VCC = 5 V 10%, TA = 25C, T1OUT, T2OUT Loaded with 3 k to GND No Load, T1IN, T2IN = VCC or T1IN, T2IN = GND TIN TIN TIN = 0 V Min 5 5 Typ 9 9 2.5 Max 6.0 0.8 mA V V A V V V V k V V s V/s kB mA 2.4 12 -30 0.8 0.2 3 3.5 0.3 8 120 300 10 60 5 1.2 1.6 0.4 5 25 +30 2.4 1.0 7 0.4 TA = 0C to 85C IOUT = 1.6 mA IOUT = -1.0 mA RS-232 to TTL RL = 3 k, CL= 1000 pF Measured from +3 V to -3 V or -3 V to +3 V RL = 3 k, CL = 1 nF VCC = V+ = V- = 0 V, VOUT = 2 V ABSOLUTE MAXIMUM RATINGS* (TA = 25C unless otherwise noted) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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-16 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470 mW R-16N SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mW R-16W SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 mW N-20 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 890 mW Thermal Impedance N-16 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135C/W R-16N SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105C/W R-16W SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105C/W N-20 DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125C/W Operating Temperature Range Commercial (J Version) . . . . . . . . . . . . . . . . . . 0C to 70C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Lead Temperature Soldering Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >2000 V *This is a stress rating only and 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 ADM202JN ADM202JRN ADM202JRW ADM203JN Temperature Range 0C to 70C 0C to 70C 0C to 70C 0C to 70C Package Option N-16 R-16N R-16W N-20 -2- REV. A ADM202/ADM203 PIN CONFIGURATIONS DIP/SOIC C1+ 1 V+ 2 C1- 3 C2+ 4 16 VCC 15 GND 14 T1OUT DIP T2IN 1 20 R2OUT 19 R2IN 18 T2OUT 17 V- T1IN 2 R1OUT 3 R1IN 4 T1OUT 5 GND 6 ADM202 13 R1IN TOP VIEW C2- 5 (Not to Scale) 12 R1OUT 11 T1IN V- 6 T2OUT 7 R2IN 8 10 T2IN 9 ADM203 16 C2- TOP VIEW 15 C2+ (Not to Scale) VCC 7 14 V+ 13 C1- 12 V- 11 C2+ R2OUT C1+ 8 GND 9 C2- 10 PIN FUNCTION DESCRIPTION Mnemonic VCC V+ V- GND C1+ C1- C2+ C2- TIN TOUT RIN ROUT Function Power Supply Input 5 V 10%. Internally Generated Positive Supply (+10 V nominal). Internally Generated Negative Supply (-10 V nominal). Ground Pin. Must be connected to 0 V. ADM202 External Capacitor, (+ terminal) is connected to this pin. ADM203: The capacitor is connected internally and no external capacitor is required. ADM202 External Capacitor, (- terminal) is connected to this pin. ADM203: The capacitor is connected internally and no external capacitor is required. ADM202 External Capacitor, (+ terminal) is connected to this pin. ADM203: The capacitor is connected internally and no external capacitor is required. ADM202 External Capacitor, (- terminal) is connected to this pin. ADM203: The capacitor is connected internally and no external capacitor is required. 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 of these inputs. Receiver Outputs. These are TTL/CMOS levels. 5V INPUT 5V INPUT VCC T1IN TTL/CMOS INPUTS* T2IN 0.1 F 16V C2+ C2- +10V TO -10V VOLTAGE INVERTER V- 0.1 F 16V T1OUT RS-232 OUTPUTS T2IN T2 T2OUT R1IN RS-232 INPUTS** R2IN INTERNAL -10V POWER SUPPLY INTERNAL +10V POWER SUPPLY TTL/CMOS OUTPUTS R2OUT DO NOT MAKE CONNECTIONS TO THESE PINS C1+ C2+ C1- C2+ V- C2- V- V+ R2 R2IN R1OUT T2 T2OUT R1IN RS-232 INPUTS** T1 T1OUT RS-232 OUTPUTS 0.1 F 6.3V C1+ C1- +5V TO +10V VOLTAGE DOUBLER VCC V+ 0.1 F 6.3V 0.1 F 6.3V R1 T1IN TTL/CMOS INPUTS* T1 R1OUT TTL/CMOS OUTPUTS R2OUT GND R1 R2 ADM203 C2- GND GND ADM202 *INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. **INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. *INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT. **INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT. Figure 1. Typical Operating Circuits REV. A -3- ADM202/ADM203 -Typical Performance Characteristics 15 15 Tx O/P HI 10 V+ 5 Tx O/P - V V+, V- - V 10 5 Tx O/P HI LOADED 0 0 -5 V- -10 -5 Tx O/P LO LOADED -10 Tx O/P LO -15 0 5 15 20 10 LOAD CURRENT - mA 25 30 -15 4.0 4.5 VCC - V 5.0 5.5 TPC 1. Charge Pump V+, V- vs. Current TPC 4. Transmitter Output Voltage vs. VCC 30 VCC = 5V RL = 3k f = 10kHz 15 25 10 Tx O/P HI Tx O/P VOLTAGE - V 5 SLEW RATE - V/ s 20 15 LOW-TO-HIGH SLEW RATE 10 HIGH-TO-LOW SLEW RATE 5 0 -5 Tx O/P LO -10 0 0 500 2k 1k 1.5k CAPACITIVE LOAD - pF 2.5k 3k -15 0 2 4 6 8 10 LOAD CURRENT - mA 12 14 TPC 2. Transmitter Slew Rate vs. Load Capacitance TPC 5. Transmitter Output Voltage vs. Current 1 T 1 T 2 T 2 T CH1 10.0V CH2 5.00V M 1.00 s CH2 -6.4V CH1 10.0V CH2 5.00V M 1.00 s CH2 UNLOADED SLEW RATE -6.4V LOADED SLEW RATE - 1nF TPC 3. Transmitter Fully Loaded Slew Rate TPC 6. Transmitter Unloaded Slew Rate -4- REV. A ADM202/ADM203 GENERAL INFORMATION S1 V+ FROM VOLTAGE DOUBLER GND INTERNAL OSCILLATOR C2 S2 S4 V- = -(V+) C4 S3 GND The ADM202/ADM203 is an RS-232 drivers/receivers designed to solve interface problems by meeting the EIA-232E specifications while using a single digital 5 V supply. The EIA 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 parts achieve this 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. The ADM203 uses internal capacitors and, therefore, no external capacitors are required. The ADM202 contains an internal voltage doubler and a voltage inverter which generates 10 V from the 5 V input. External 0.1 F capacitors are required for the internal voltage converter. The ADM202/ADM203 is a modification, enhancement and improvement to the AD230-AD241 family and derivatives thereof. It is essentially plug-in compatible and does not have materially different applications. CIRCUIT DESCRIPTION Figure 3. Charge Pump Voltage Inverter 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, as 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 . Receiver Section The internal circuitry 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-DC Voltage Converter 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 below. 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. 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. On the ADM203, all capacitors C1 to C4 are molded into the package. The V+ and V- supplies may also be used to power external circuitry if the current requirements are small. S1 VCC C1 S2 GND INTERNAL OSCILLATOR S4 VCC C3 S3 V+ = 2VCC 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 requirement. The low level threshold is deliberately positive as it ensures that an unconnected input will be interpreted as a low level. The receivers have Schmitt trigger input with a hysteresis level of 0.5 V. This ensures error free reception both for noisy inputs and for inputs with slow transition times. Figure 2. Charge Pump Voltage Doubler REV. A -5- ADM202/ADM203 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Lead Plastic DIP (N-16) 0.840 (21.34) 0.745 (18.92) 16 1 9 8 0.280 (7.11) 0.240 (6.10) 0.060 (1.52) 0.015 (0.38) 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) PIN 1 0.210 (5.33) MAX 0.150 (3.81) 0.200 (5.05) MIN 0.125 (3.18) 0.022 (0.558) 0.100 0.070 (1.77) SEATING PLANE (2.54) 0.014 (0.356) 0.045 (1.15) BSC 16-Lead Narrow SOIC (R-16N) 0.3937 (10.00) 0.3859 (9.80) 0.1574 (4.00) 0.1497 (3.80) 16 1 9 8 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.050 (1.27) BSC 0.0688 (1.75) 0.0532 (1.35) 0.0196 (0.50) 0.0099 (0.25) 45 0.0098 (0.25) 0.0040 (0.10) 8 0.0192 (0.49) SEATING 0 0.0099 (0.25) PLANE 0.0138 (0.35) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 16-Lead Wide SOIC (R-16W) 0.413 (10.50) 0.348 (10.10) 20 16 9 20-Lead Plastic DIP (N-20) 1.060 (26.90) 0.925 (23.50) 11 10 1 0.280 (7.11) 0.240 (6.10) 0.060 (1.52) 0.015 (0.38) 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.2992 (7.60) 0.2914 (7.40) 1 8 PIN 1 0.210 (5.33) MAX 0.200 (5.05) 0.125 (3.18) 0.022 (0.558) 0.014 (0.356) 0.419 (10.65) 0.404 (10.26) PIN 1 0.050 (1.27) BSC 0.107 (2.72) 0.089 (2.26) 0.0291 (0.74) 0.0098 (0.25) 45 0.010 (0.25) 0.004 (0.10) 8 0.018 (0.46) SEATING 0 0.015 (0.38) 0.014 (0.36) PLANE 0.007 (1.18) 0.045 (1.15) 0.020 (0.50) -6- REV. A PRINTED IN U.S.A. 0.150 (3.81) MIN SEATING 0.100 0.070 (1.77) (2.54) 0.045 (1.15) PLANE BSC C00065-0-1/01 (rev. A) This datasheet has been download from: www..com Datasheets for electronics components. |
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