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High Speed, 5 V, 0.1 µF

CMOS RS-232 Driver/Receiver

Data Sheet

ADM202

Rev. B Document Feedback

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FEATURES

120 kB transmission rate

Small (0.1 µF) charge pump capacitors

Single 5 V power supply

Meets TIA/EIA-232-E and V.28 specifications

2 drivers and 2 receivers

On-board dc-to-dc converters

±9 V output swing with 5 V supply

Low power BiCMOS: 2.5 mA I

±30 V receiver input levels

APPLICATIONS

Computers

Peripherals

Modems

Printers

Instruments

TYPICAL APPLICATION CIRCUIT

ADM202

0.1µF

6.3V

0.1µF

6.3V

0.1µF

6.3V

0.1µF

16V

0.1µF

16V

C1+

C1–

C2–

C2+

OUT

TTL/CMOS

INPUTS

RS-232

OUTPUTS

OUT

TTL/CMOS

OUTPUTS

RS-232

INPUTS

V–

+10V TO –10V

VOLTAGE

INVERTER

5V INPUT

V+

+5V TO +10V

VOLTAGE

DOUBLER

GND

INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.

INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.

00065-001

Figure 1.

GENERAL DESCRIPTION

The ADM202 is a 2-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 µF.

This converter generates ±10 V RS-232 output levels.

The ADM202 meets or exceeds the TIA/EIA-232-E a n d V. 2 8

specifications. Fast driver slew rates permit 120 kB operation,

and high drive currents allow extended cable lengths.

An epitaxial BiCMOS construction minimizes power consump-

tion to 10 mW and 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 a 16-lead PDIP and both narrow

and wide 16-lead SOIC packages.

Summary of content (10 pages)

PAGE 1
High Speed, 5 V, 0.1 µF CMOS RS-232 Driver/Receiver ADM202 Data Sheet FEATURES TYPICAL APPLICATION CIRCUIT 5V INPUT 120 kB transmission rate Small (0.1 µF) charge pump capacitors Single 5 V power supply Meets TIA/EIA-232-E and V.28 specifications 2 drivers and 2 receivers On-board dc-to-dc converters ±9 V output swing with 5 V supply Low power BiCMOS: 2.5 mA ICC ±30 V receiver input levels 0.1µF + 6.3V 0.
PAGE 2
ADM202 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications ....................................................................................... 1 Theory of Operation .........................................................................7 Typical Application Circuit ......................................................
PAGE 3
Data Sheet ADM202 SPECIFICATIONS VCC = 5 V ± 10%, (C1 to C4 = 0.1 µF). All specifications TMIN to TMAX, unless otherwise noted. Table 1.
PAGE 4
ADM202 Data Sheet ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Rating 6V (VCC − 0.3 V) to +14 V +0.3 V to −14 V Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied.
PAGE 5
Data Sheet ADM202 C1+ 1 16 VCC V+ 2 15 GND T1OUT C1– 3 C2+ 4 C2– 5 ADM202 TOP VIEW (Not to Scale) 14 13 R1IN 12 R1OUT V– 6 T2OUT 7 11 T1IN 10 T2IN R2IN 8 9 R2OUT 00065-002 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 2. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7, 14 8, 13 Mnemonic C1+ V+ C1− C2+ C2− V− T2OUT, T1OUT R2IN, R1IN 9, 12 10, 11 R2OUT, R1OUT T2IN, T1IN 15 16 GND VCC Description External Positive Capacitor 1 Connection.
PAGE 6
ADM202 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 15 15 10 10 Tx OUTPUT VOLTAGE (V) V+ 5 V+, V– (V) Tx OUTPUT HIGH 0 –5 V– Tx OUTPUT HIGH LOADED 5 0 –5 –10 Tx OUTPUT LOW LOADED –10 10 15 20 25 30 LOAD CURRENT (mA) –15 4.0 15 VCC = 5V RL = 3kΩ f = 10kHz Tx OUTPUT VOLTAGE (V) 10 LOW-TO-HIGH SLEW RATE 10 HIGH-TO-LOW SLEW RATE 5 0 –5 Tx OUTPUT LOW –10 0 0.5k 1.0k 1.5k 2.0k 2.5k 3.
PAGE 7
Data Sheet ADM202 THEORY OF OPERATION The ADM202 is an RS-232 driver/receiver designed to solve interface problems by meeting the TIA/EIA-232E specifications while using a single digital 5 V supply. The EIA standard requires that transmitters deliver ±5 V minimum on the transmission channel and that receivers can accept signal levels down to ±3 V. The device achieves this by integrating step-up voltage converters and level shifting transmitters and receivers on the same chip.
PAGE 8
ADM202 Data Sheet APPLICATIONS INFORMATION The internal circuitry consists of three main sections, as follows: TTL/CMOS TO RS-232 TRANSMITTERS (DRIVERS) • • • The drivers convert TTL/CMOS input levels into TIA/EIA-232-E output levels. With VCC = 5 V and driving a typical TIA/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 TIA/EIA232-E minimum requirement.
PAGE 9
Data Sheet ADM202 OUTLINE DIMENSIONS 0.775 0.755 0.735 9 PIN 1 INDICATOR 0.280 0.250 0.240 1 8 TOP VIEW 0.100 BSC 0.210 MAX SIDE VIEW 0.325 0.310 0.300 0.195 0.130 0.115 0.015 MIN 0.150 0.130 0.115 0.022 0.018 0.015 0.070 0.045 0.060 0.039 0.055 0.030 0.015 GAUGE PLANE END VIEW SEATING PLANE 0.021 0.016 0.011 0.012 0.010 0.008 0.430 MAX 03-07-2014-D 16 COMPLIANT TO JEDEC STANDARDS MS-001-BB Figure 11.
PAGE 10
ADM202 Data Sheet 10.50 (0.4134) 10.10 (0.3976) 9 16 7.60 (0.2992) 7.40 (0.2913) 8 1.27 (0.0500) BSC 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) 10.65 (0.4193) 10.00 (0.3937) 0.75 (0.0295) 45° 0.25 (0.0098) 2.65 (0.1043) 2.35 (0.0925) SEATING PLANE 8° 0° 0.33 (0.0130) 0.20 (0.0079) 1.27 (0.0500) 0.40 (0.