Powered RS-232/RS-422 Transceiver AD7306 T1OUT T2OUT T3OUT T3OUT

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Powered RS-232/RS-422 Transceiver AD7306 T1OUT T2OUT T3OUT T3OUT

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FEATURES RS-232 RS-422 Chip Single Supply Capacitors Short Circuit Protection Excellent Noise Immunity Power BiCMOS Technology High Speed, Skew RS-422 Operation Operations APPLICATIONS DTE-DCE Interface Packet Switching Local Area Networks Data Concentration Data Multiplexers Integrated Services Digital Network (ISDN) GENERAL DESCRIPTION
Powered RS-232/RS-422 Transceiver AD7306
T1OUT T2OUT T3OUT T3OUT CONNECT T1IN T2IN T3IN 232/422
AD7306 SOIC
VIEW (Not Scale)
AD7306 line driver/receiver monolithic product which provides interface between signal levels dual standard RS-232/RS-422 signal levels. part contains RS-232 drivers, RS-422 driver, RS-232 receiver, receiver path which configured either RS-232 RS-422. internal charge pump voltage converter facilitates operation from single power supply. internal charge pump generates levels allowing RS-232 output levels developed without need external bipolar power supplies. highly efficient charge pump design allows operation using polarized, miniature capacitors. This gives considerable saving printed circuit board space over conventional products which capacitors. charge pump output voltages also used power external circuitry which requires dual supplies.
RS-232 channels suitable communications rates RS-422 channels suitable high speed communications MHz. RS-422 transmitter complementary outputs closely matched feature timing skew between complementary outputs. This often essential requirement meet tight system timing specifications. inputs feature protection, driver outputs feature high source sink current capability internally protected against short circuits outputs. epitaxial layer used guard against latch-up. part available 24-lead SOIC 24-pin plastic package.
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: 617/329-4700 Fax: 617/326-8703
AD7306-SPECIFICATIONS
Parameter RS-232 DRIVER Input Logic Low, VINL Input Logic High, VINH Input Logic Current RS-232 High Level Output Voltage RS-232 Level Output Voltage Output Short Circuit Current Slew Rate Output Resistance (Powered Down) RS-232 RECEIVER Input Voltage Range RS-232 Input Threshold RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance Output Voltage Low, Output Voltage High, RS-422 DRIVER Input Logic Low, VINL Input Logic High, VINH Logic Input Current Differential Output Voltage Common-Mode Output Voltage |VOUT| Complementary States Output Short Circuit Current RS-422 RECEIVER Common-Mode Voltage Range Differential Input Threshold Voltage Input Voltage Hysteresis Input Resistance Output Voltage Low, Output Voltage High, 232/422 Input Input Logic Low, VINL Input Logic High, VINH Logic Input Current POWER SUPPLY CURRENT CHARGE PUMP VOLTAGE GENERATOR Output Voltage Output Voltage Generator Rise Time
Specifications subject change without notice.
specifications TMIN unless otherwise noted.)
Units V/µs V/µs Test Conditions/Comments
-5.0 -6.5
VOUT +70°C 2500 VOUT
IOUT IOUT
+0.2
Diff Figure Diff Figure Diff VCMR Typical RS-422 Input Voltage IOUT +4.0 IOUT -4.0
-0.2
Outputs Unloaded RS-232 Output Unloaded; Typical Performance Curves RS-232 Outputs Unloaded; Typical Performance Curves
REV.
AD7306 TIMING SPECIFICATIONS
Parameter RS-422 Driver Propagation Delay Input Output TPLH, TPHL RS-422 TSKEW Driver Rise/Fall Time RS-422 Receiver Propagation Delay Input Output TPLH, TPHL RS-232/RS-422 Enable RS-232 Disable RS-422 Enable TEN1 RS-422 Disable RS-232 Enable TEN2 Transmission Rate (RS-422) RS-232 Receiver Propagation Delay Input Output Transmission Rate (RS-232)
(VCC specifications TMIN TMAX unless otherwise noted.)
1000 Units Test Conditions/Comments Diff Figures Diff Figures Diff Figures Figure Figure Figure
ABSOLUTE MAXIMUM RATINGS*
+25°C unless otherwise noted)
(VCC -0.3 +13.2 +0.3 -13.2 Inputs T1IN, T2IN T3IN -0.3 R1IN A/B, R2IN 232/422 -0.3 Outputs T1OUT, T2OUT T3OUT(A), -0.3 R1OUT, R2OUT -0.3 (VCC
Short Circuit Duration TOUT Continuous Power Dissipation Small Outline Operating Temperature Range Commercial Version) +70°C Industrial Version) -40°C +85°C Storage Temperature Range -65°C +150°C Lead Temperature (Soldering, secs) +300°C
*Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions above those listed operational sections this specification implied. Exposure absolute maximum ratings extended periods time affect device reliability.
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AD7306 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
ORDERING GUIDE
Model AD7306JR AD7306JN AD7306AR AD7306AN
Temperature Range Package Description +70°C +70°C -40°C +85°C -40°C +85°C 24-Lead SOIC 24-Pin 24-Lead SOIC 24-Pin
Package Option R-24 N-24 R-24 N-24
REV.
AD7306
FUNCTION DESCRIPTION
SOIC
Mnemonic C1+, R2IN T1OUT T2OUT R1IN R1IN/R1IN T3OUT T3OUT 232/422 T3IN R1OUT T2IN T1IN R2OUT C2+,
Function Internally Generated Positive Supply nominal). capacitor must connected between this GND. External Capacitor Terminals. capacitor must connected between these pins. RS-232 Receiver Input. This input accepts RS-232 input voltages. RS-232 Transmitter (Driver) Output (Typically RS-232 Transmitter (Driver) Output (Typically Power Supply Input 5%). RS-422 Receiver Differential Input Receiver Input. configured accept either single ended RS-232 levels differential RS-422 levels. configured using 232/422 pin. RS-422 Transmitter (Driver) Differential Output RS-232 Transmitter (Driver) Differential Output Connect Pins. Ground Pin. Must connected Select Input. This input configures Receiver accept either RS-232 RS-422 signal levels. Logic this input selects operation while Logic selects operation. TTL/CMOS Input RS-422 Transmitter TTL/CMOS Output from Receiver TTL/CMOS Input RS-232 Transmitter TTL/CMOS Input RS-232 Transmitter TTL/CMOS Output from Receiver External Capacitor Terminals. capacitor must connected between these pins. Internally Generated Negative Supply nominal). capacitor must connected between this GND.
CONFIGURATIONS SOIC
T1OUT T2OUT T3OUT T3OUT
CONNECT
T1IN T2IN T3IN 232/422
T2OUT T3OUT T3OUT 232/422 T3IN
CONNECT
T1OUT
AD7306 SOIC
VIEW (Not Scale)
AD7306
VIEW (Not Scale)
REV.
AD7306
INPUT 0.1µF
1.5V
1.5V
0.1µF
0.1µF
0.1µF
±10V POWER SUPPLY GENERATOR
0.1µF
SKEW
SKEW
POINT
TTL/CMOS INPUTS
RS-232 OUTPUTS RS-422 OUTPUT
POINT
POINT POINT
AD7306
TTL/CMOS OUTPUTS
RS-232 INPUT
Figure RS-422 Driver. Propagation Delay Rise/Fall Timing
2.5V -2.5V
RS-232/ R1IN RS-422 INPUT RS-422 INPUT
DIFFERENTIAL INPUT
232/422
Figure AD7306 Application Circuit
100pF DIFF 100pF
Figure RS-422 Receiver Timing
232/422
1.5V
1.5V
RS-422 RS-232
Figure RS-422 Driver. Propagation Delay Test Circuit
RS-232
DIFF
Figure RS-232/RS-422 Receiver Enable Timing
Figure RS-422 Driver. Voltage Measurement Test Circuit
REV.
AD7306
GENERAL DESCRIPTION RS-232 Drivers
AD7306 drivers/receivers provide interface which compatible with RS-232/RS-422 standard interfaces. both standards widely accepted often necessary provide interface which compatible with both. AD7306 ideally suited this type application both standards using single package. This part contains RS-232 drivers, RS-422 driver, RS-232 receiver, receiver path which configured either RS-232 RS-422. This receiver configured using 232/422 pin. This part also contains internal charge pump voltage converter which facilitates operation using single power supply.
Charge Pump DC-DC Voltage Generator
charge pump voltage generator uses switched capacitor technique develop levels from input supply. highly efficient charge pump design coupled with high frequency internal oscillator permit operation using four capacitors.
INPUT SUPPLY ±10V POWER SUPPLY GENERATOR 0.1µF 0.1µF +10V OUTPUT
RS-232 drivers AD7306 meet RS-232 specifications. drivers inverting level shifters which convert TTL/CMOS levels into RS-232 output levels. input switching threshold typically With typical RS-232 load, output levels Under worst case load conditions, drivers guaranteed provide which meets minimum RS-232 requirement. output slew rate internally limited V/µs without need external slew limiting capacitor. Short circuit protection also provided which prevents damage event output fault conditions. Active current limiting used which limits output short circuit current less than event output fault. This type current limiting does degrade output voltage swing under normal loading conditions would case with conventional passive limiting. powered-down output impedance typically This considerably larger than minimum value required RS-232 specification. provides additional protection under fault conditions where another powered-up transmitter output inadvertently shorted powered-down device.
RS-232 Receivers
-10V OUTPUT
0.1µF
0.1µF
Figure Charge Pump Voltage Generator
Capacitors charge storage capacitors while provide output smoothing. correct operation four capacitors must included. Either polarized nonpolarized capacitors used C1-C4. polarized type used, then correct polarity should observed. This ignored with nonpolarized type capacitors. charge pump output voltages, used internally power RS-232 transmitters. This permits RS-232 output levels developed RS-232 transmitter outputs. charge pump output voltages also used power external circuitry current requirements small. Please refer Typical Performance Characteristics. generator rise time after power typical. This time necessary completely charge storage capacitors charge pump. Therefore, RS-232 data transmission should initiated until this time elapsed after switch This will ensure that valid data always transmitted.
receivers inverting level shifters which accept RS-232 input levels translates them into TTL/CMOS levels. input switching thresholds minimum maximum which well within RS-232 requirement Internal pull-down resistors provided receiver inputs. This ensures that unconnected input will interpreted level giving Logic TTL/CMOS output. Excellent noise immunity achieved hysteresis internal filtering circuitry. filter rejects noise glitches duration.
RS-422 Driver
RS-422 driver AD7306 accepts TTL/CMOS input translates into differential RS-422 level signal. input switching threshold typically unloaded output differential voltage typically (see Typical Performance Characteristics). Short circuit protection provided output which limits current less than
RS-422 Receiver
RS-422 receiver AD7306 accepts differential input signal translates into TTL/CMOS output level. input resistance both differential inputs typical. With receiver inputs unconnected (floating), internal biasing ensures that receiver output Logic "1." Excellent noise immunity high transmission speed achieved using differential configuration.
REV.
Typical Performance Characteristics-AD7306
VOLTAGE OUTPUT VRS-232 TRANSMITTER OUTPUT VOLTAGE
CURRENT
CURRENT
OUTPUT CURRENT
RS-232 TRANSMITTER OUTPUT CURRENT
Figure Voltage Current
Figure RS-232 Driver Output Voltage Current
5.25V
SLEW RATE -V/µs
DIFFERENTIAL VOLTAGE
5.0V 4.75V
1000 1500 2000 2500 LOAD CAPACITANCE DIFFERENTIAL CURRENT
Figure RS-232 Driver Slew Rate Load Capacitance
Figure RS-422 Driver Output Current Output Voltage
10ns
Figure RS-232 Driver;
Figure RS-422 Driver; RLDIFF
REV.
AD7306
Single-Ended Data Transmission Differential Data Transmission
Single-ended interfaces used speed, short distance communications such from computer terminal printer. single line used carry signal. Various standards have been developed standardize communication link, most popular these being RS-232. RS-232 standard introduced 1962 been widely used throughout industry. standard been revised several times, current revision known EIA-232E. RS-232 standard suitable single-ended data transmission relatively slow data rates over short distances. typical RS-232 interface shown Figure
DATA RS-232 CHANNEL DATA
When transmitting high data rates, over long distances through noisy environments, single-ended data transmission often inadequate. this type application, differential data transmission offers superior performance. Differential transmission uses signal lines transmit data. rejects ground shifts insensitive noise signals which appear common mode voltages transmission lines. accommodate faster data communication, differential RS-422 standard developed. Therefore, used reliably transmit data higher speeds over longer distances than single-ended transmission. typical RS-422 interface shown Figure
DATA RS-422 CHANNEL DATA
Figure Single-Ended RS-232 Interface
Figure Differential RS-422 Interface
Table Comparison RS-232 RS-422 Interface Standards
Specification Transmission Type Maximum Data Rate Maximum Cable Length Minimum Driver Output Voltage Slew Rate Receiver Input Resistance Receiver Input Sensitivity Receiver Input Voltage Range Drivers Line Receivers Line
EIA-232E Single-Ended kB/s Load Dependent V/µs
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
RS-422 Differential MB/s 4000
24-Lead SOIC (R-24)
0.6141 (15.60) 0.5985 (15.20)
24-Lead Plastic (N-24)
0.260 0.001 (6.61 0.03)
0.4193 (10.65) 0.3937 (10.00)
0.2992 (7.60) 0.2914 (7.40)
1.228 (31.19) 1.226 (31.14) 0.130 (3.30) 0.128 (3.25) SEATING PLANE
0.32 (8.128) 0.30 (7.62)
0.1043 (2.65) 0.0926 (2.35)
0.0291 (0.74) 0.0098 (0.25)
0.011 (0.28) 0.009 (0.23)
0.0118 (0.30) 0.0040 (0.10)
0.0500 (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)
0.02 (0.5) 0.016 (0.41)
0.11 (2.79) 0.09 (2.28)
0.07(1.78) 0.05 (1.27)
NOTES LEAD IDENTIFIED NOTCH. PLASTIC LEADS WILL EITHER SOLDER DIPPED LEAD PLATED ACCORDANCE WITH MIL-M-385 REQUIREMENTS.
REV.
PRINTED U.S.A.
C1624a-2-8/94

Powered RS-232/RS-422 Transceiver AD7306 T1OUT T2OUT T3OUT T3OUT

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