High-Speed, CMOS RS-232 Drivers/Receivers ADM222/ADM232A/ADM242*

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High-Speed, CMOS RS-232 Drivers/Receivers ADM222/ADM232A/ADM242*

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FEATURES kB/s Transmission Rate Small (0.1 Charge Pump Capacitors Single Power Supply Meets EIA-232-E V.28 Specifications Drivers Receivers On-Board DC-DC Converters Output Swing with Supply Receiver Input Levels Compatible with MAX222/MAX232A/MAX242 APPLICATIONS Computers Peripherals Modems Printers Instruments
High-Speed, CMOS RS-232 Drivers/Receivers ADM222/ADM232A/ADM242*
INPUT +10V VOLTAGE DOUBLER -10V VOLTAGE INVERTER
T1IN TTL/CMOS INPUTS* T2IN R1OUT TTL/CMOS OUTPUTS R2OUT
T1OUT T2OUT R1IN R2IN SHDN RS-232 INPUTS** RS-232 OUTPUTS
ADM2xx
(ADM242) (ADM222, ADM242)
GENERAL DESCRIPTION
ADM222, ADM232A, ADM242 family high-speed RS-232 line drivers/receivers offering transmission rates kB/s. Operating from single power supply, highly efficient on-chip charge pump using small (0.1 external capacitors allows RS-232 bipolar levels developed. RS-232 drivers RS-232 receivers provided each device. devices fabricated BiCMOS, advanced mixed technology process that combines power CMOS with highspeed bipolar circuitry. This allows transmission rates kB/s, minimizes quiescent power supply current under ADM232A pin-compatible, high-speed upgrade AD232 ADM232L. available 16-lead both narrow wide surface-mount (SOIC) packages. ADM222 contains additional shutdown (SHDN) function that used disable device, thereby reducing supply current During shutdown, transmit/receive
PULL-UP RESISTOR EACH TTL/CMOS INPUT INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
INTERNAL 400k
functions disabled. ADM222 available 18-lead wide surface-mount (SOIC) package. ADM242 combines both shutdown (SHDN) enable (EN) functions. shutdown function reduces supply current During shutdown, transmitters disabled receivers continue operate normally. enable function allows receiver outputs disabled thereby facilitating sharing common bus. ADM242 available 18-lead wide surface-mount (SOIC) package.
*Protected U.S. Patent 5,237,209.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2001
ifications
Parameter RS-232 TRANSMITTERS Output Voltage Swing Input Logic Threshold Low, VINL Input Logic Threshold High, VINH Logic Pull-Up Current Data Rate Output Resistance Output Short Circuit Current (Instantaneous) RS-232 RECEIVERS RS-232 Input Voltage Range RS-232 Input Threshold RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance TTL/CMOS Output Voltage Low, TTL/CMOS Output Voltage High, TTL/CMOS Output Short-Circuit Current TTL/CMOS Output Short-Circuit Current TTL/CMOS Output Leakage Current Input Threshold Low, VINL Input Threshold High, VINH POWER SUPPLY Power Supply Current Shutdown Power Supply Current SHDN Input Leakage Current SHDN Input Threshold Low, VINL SHDN Input Threshold High, VINH CHARACTERISTICS Transition Region Slew Rate Transmitter Propagation Delay RS-232 Receiver Propagation Delay RS-232 Receiver Output Enable Time Receiver Output Disable Time Transmitter Output Enable Time Transmitter Output Disable Time Transmitter Propagation Delay Difference Receiver Propagation Delay Difference
*Guaranteed design, production tested. Specifications subject change without notice.
(VCC
10%. C1-C4 spec-
TMAX unless otherwise noted.)
Unit
Test Conditions/Comments Transmitter Outputs Loaded with Ground VOUT
kB/s V/µs
0.05 0.05 0.85
85°C IOUT IOUT -1.0 Source Current (VOUT GND)* Sink Current (VOUT VCC)* SHDN GND/EN VOUT
Load Load Both Outputs
1000 Measured from tPHLT tPLHT tPHLR tPLHR SHDN Goes High SHDN Goes
REV.
ADM222/ADM232A/ADM242
ABSOLUTE MAXIMUM RATINGS*
25°C unless otherwise noted)
(VCC +0.3 Input Voltages -0.3 (VCC Output Voltages TOUT (V+, +0.3 (V-, -0.3 ROUT -0.3 (VCC Short Circuit Duration TOUT Continuous Power Dissipation N-16 (Derate mW/°C above 70°C) Thermal Impedance 80°C/W Power Dissipation R-16N (Derate mW/°C above 70°C) Thermal Impedance 80°C/W Power Dissipation R-16W (Derate mW/°C above 70°C) Thermal Impedance 80°CW Power Dissipation N-18 (Derate mW/°C above 70°C) Thermal Impedance 80°C/W
Power Dissipation R-18W (Derate mW/°C above 70°C) Thermal Impedance 80°C/W Operating Temperature Range Industrial Version) -40°C +85°C Storage Temperature Range -65°C +150°C Lead Temperature (Soldering, sec) 300°C Vapor Phase sec) 215°C Infrared sec) 220°C
*This stress rating only functional operation device these other conditions above those indicated operation sections this specification implied. Exposure absolute maximum rating conditions extended periods time affect reliability.
ORDERING GUIDE
Model ADM222AN ADM222AR ADM232AAN ADM232AARN ADM232AARW ADM242AN ADM242AR
Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C
Package Description Plastic Wide SOIC Plastic Narrow SOIC Wide SOIC Plastic Wide SOIC
Package Option N-18 R-18W N-16 R-16N R-16W N-18 R-18W
Test Circuits
PLHT
VOUT
PHLT
PHLR
PLHR
VOUT
Figure Transmitter Propagation Delay Timing
Figure Receiver Propagation Delay Timing
INPUT
INPUT
3.5V RECEIVER OUTPUT 0.8V
0.5V RECEIVER OUTPUT 0.5V
Figure Receiver Enable Timing
Figure Receiver Disable Timing
REV.
ADM222/ADM232A/ADM242
SHDN 50pF VOUT
FUNCTION DESCRIPTION
Mnemonic
Function Power Supply Input, 10%. Internally generated positive supply (+10 nominal). Internally generated negative supply (-10 nominal). Ground Pin. Must connected External capacitor terminal) connected this pin. External capacitor terminal) connected this pin. External capacitor terminal) connected this pin. External capacitor terminal) connected this pin. Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. internal pull-up resistor connected each input. Transmitter (Driver) Outputs. These RS-232 levels (typically Receiver Inputs. These inputs accept RS-232 signal levels. internal pull-down resistor connected each these inputs. Receiver Outputs. These TTL/CMOS levels. Connect. connections required this pin. (ADM242 Only) Active Digital Input. used enable disable (three-state) both receiver outputs. (ADM222 ADM242) Active Digital Input. used disable device that power consumption minimized. ADM222 drivers receivers disabled. ADM242 drivers disabled receivers remain enabled.
Figure Shutdown Test Circuit
SHDN INPUT
TRANSMITTER OUTPUT
TOUT
Figure Transmitter Shutdown Disable Timing
ROUT
INPUT 6.3V
+10V VOLTAGE DOUBLER -10V VOLTAGE INVERTER
SHDN
T1OUT T2OUT R1IN R2IN SHDN RS-232 INPUTS** RS-232 OUTPUTS
T1IN TTL/CMOS INPUTS* T2IN R1OUT TTL/CMOS OUTPUTS
R2OUT
SHDN T1OUT
ADM222
ADM222
VIEW R1IN (Not Scale) R1OUT
PULL-UP RESISTOR EACH TTL/CMOS INPUT INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
INTERNAL 400k
T1IN T2IN R2OUT
T2OUT R2IN
CONNECT
Figure ADM222 Typical Operating Circuit
Figure ADM222 SOIC Configurations
REV.
ADM222/ADM232A/ADM242
SHDN
T1OUT
ADM242
T1OUT
ADM232A
R1IN
VIEW (Not Scale) R1OUT T2OUT R2IN
T1IN T2IN
VIEW R1IN (Not Scale) R1OUT
T1IN T2IN R2OUT
T2OUT R2IN
R2OUT
Figure ADM232A DIP/SOIC Configuration
Figure ADM242 DIP/SOIC Configuration
INPUT 6.3V 6.3V -10V VOLTAGE INVERTER T1OUT T2OUT R1IN R2IN RS-232 INPUTS** TTL/CMOS OUTPUTS RS-232 OUTPUTS TTL/CMOS INPUTS*
INPUT
+10V VOLTAGE DOUBLER
+10V VOLTAGE DOUBLER -10V VOLTAGE INVERTER
T1OUT T2OUT R1IN R2IN RS-232 INPUTS** RS-232 OUTPUTS
T1IN TTL/CMOS INPUTS* T2IN R1OUT TTL/CMOS OUTPUTS R2OUT
T1IN T2IN R1OUT R2OUT
ADM232A
PULL-UP RESISTOR EACH TTL/CMOS INPUT INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
ADM242
SHDN
INTERNAL 400k
PULL-UP RESISTOR EACH TTL/CMOS INPUT INTERNAL PULL-DOWN RESISTOR EACH RS-232 INPUT
INTERNAL 400k
Figure ADM232A Typical Operating Circuit
Figure ADM242 Typical Operating Circuit
REV.
ADM222/ADM232A/ADM242 -Typical Performance Characteristics
VOLTAGE
LOAD CURRENT
LOAD CURRENT
Charge Pump Current
Transmitter Output Voltage Current
115kBps
TRANSMITTER OUTPUT VOLTAGE
230kBps
115kBps
0.010V
460kBps 460kBps 230kBps
1000 1500 2000 LOAD CAPACITANCE
2500
3000
Transmitter Baud Rate Load Capacitance
Charge Pump Exiting Shutdown
6.2V 140ns -3.5V
6.0V 600ns -2.9V
10.0V
5.00V
1.00
-6.4V
10.0V
5.00V
1.00
-6.4V
Transmitter Unloaded Slew Rate
Transmitter Fully Loaded Slew Rate
REV.
ADM222/ADM232A/ADM242
GENERAL INFORMATION
ADM222/ADM232A/ADM242 high-speed RS-232 drivers/receivers requiring single digital supply. RS-232 standard requires transmitters that will deliver minimum transmission channel receivers that accept signal levels down parts achieve this integrating stepup voltage converters level-shifting transmitters receivers onto same chip. CMOS technology used keep power dissipation absolute minimum. devices contain internal charge pump voltage doubler voltage inverter that generates from input. Four external capacitors required internal charge pump voltage converter. ADM222/ADM232A/ADM242 modification, enhancement improvement AD230-AD241 family derivatives thereof. essentially plug-in-compatible does have materially different applications.
CIRCUIT DESCRIPTION
input threshold levels both TTL- CMOS-compatible with switching threshold VCC/4. With nominal switching threshold 1.25 typical. Unused inputs left unconnected, internal pull-up resistor pulls them high forcing outputs into state. required RS-232 standard, slew rate limited less than V/µs without need external slew limiting capacitor, output impedance power-off state greater than
Receiver Section
internal circuitry consists four main sections. These are: Charge Pump Voltage Converter TTL/CMOS RS-232 Transmitters RS-232 TTL/CMOS Receivers Enable Shutdown Functions.
Charge Pump DC-DC Voltage Converter
receivers inverting level-shifters that accept RS-232 input levels translate them into TTL/ CMOS levels. inputs have internal pull-down resistors ground also protected against overvoltages guaranteed switching thresholds minimum maximum, which well within RS-232 requirement. level threshold deliberately positive ensures that unconnected input will interpreted level. receivers have Schmitt trigger input with hysteresis level This ensures error-free reception both noisy inputs inputs with slow transition times
Enable Shutdown Functions
Charge Pump Voltage converter consists oscillator switching matrix. converter generates supply from input level. This done stages using switched capacitor technique. input supply doubled using capacitor charge storage element. level also generated from input supply using storage elements. Capacitors used reduce output ripple. Their values critical reduced higher levels ripple acceptable. charge pump capacitors also reduced expense higher output impedance supplies. supplies also used power external circuitry current requirements small. Please refer typical performance characteristics which shows output voltage current. shutdown mode charge pump disabled decays while decays
Transmitter (Driver) Section
ADM222, both receivers fully disabled during shutdown. ADM242, both receivers continue operate normally. This function useful monitoring activity that when occurs, device taken shutdown mode. ADM242 also contains receiver enable function (EN) which used fully disable receivers, independent SHDN.
APPLICATIONS INFORMATION
selection typical operating circuits shown TPCs Figure
2.0V
Drivers convert TTL/CMOS input levels into RS-232 output levels. With driving typical RS-232 load, output voltage swing Even under worst-case conditions drivers guaranteed meet RS-232 minimum requirement.
Figure Transmitter Output Disable Timing
REV.
ADM222/ADM232A/ADM242
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
16-Lead Plastic (N-16)
0.840 (21.34) 0.745 (18.92)
16-Lead Narrow SOIC (R-16N)
0.3937 (10.00) 0.3859 (9.80)
0.280 (7.11) 0.240 (6.10) 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
0.060 (1.52) 0.015 (0.38) 0.210 (5.33) 0.130 (3.30) 0.160 (4.06) 0.115 (2.93) 0.022 (0.558) 0.100 0.070 (1.77) SEATING PLANE (2.54) 0.014 (0.356) 0.045 (1.15)
0.050 (1.27)
0.0688 (1.75) 0.0532 (1.35)
0.0196 (0.50) 0.0099 (0.25)
0.0098 (0.25) 0.0040 (0.10)
0.0192 (0.49) SEATING 0.0099 (0.25) 0.0138 (0.35) PLANE 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
16-Lead Wide SOIC (R-16W)
0.4133 (10.50) 0.3977 (10.00)
18-Lead Wide SOIC (R-18W)
0.4625 (11.75) 0.4469 (11.35)
0.2992 (7.60) 0.2914 (7.40)
0.2992 (7.60) 0.2914 (7.40)
0.4193 (10.65) 0.3937 (10.00)
0.4193 (10.65) 0.3937 (10.00)
0.050 (1.27)
0.1043 (2.65) 0.0926 (2.35)
0.0291 (0.74) 0.0098 (0.25)
0.1043 (2.65) 0.0926 (2.35)
0.0291 (0.74) 0.0098 (0.25)
0.0118 (0.30) 0.0040 (0.10)
0.0192 (0.49) SEATING 0.0125 (0.32) 0.0138 (0.35) PLANE 0.0091 (0.23)
0.0500 (1.27) 0.0157 (0.40)
0.0118 (0.30) 0.0500 0.0040 (0.10) (1.27)
0.0192 (0.49) SEATING 0.0125 (0.32) 0.0138 (0.35) PLANE 0.0091 (0.23)
0.0500 (1.27) 0.0157 (0.40)
18-Lead Plastic (N-18)
0.925 (23.49) 0.845 (21.47)
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)
0.210 (5.33) 0.160 (4.06) 0.115 (2.93) 0.022 (0.558) 0.014 (0.356)
0.130 (3.30) 0.100 0.070 (1.77) SEATING PLANE (2.54) 0.045 (1.15)
REV.
PRINTED U.S.A.
C01213-0-1/01 (rev.

High-Speed, CMOS RS-232 Drivers/Receivers ADM222/ADM232A/ADM242*

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