Analog Devices ADM202EARW, ADM202EARU, ADM202EARN, ADM202EAN, ADM1181AAN Datasheet

a EMI/EMC-Compliant, 15 kV ESD Protected,

RS-232 Line Drivers/Receivers

ADM202E/ADM1181A

FEATURES

Complies with 89/336/EEC EMC Directive ESD Protection to IEC1000-4-2 (801.2)8 kV: Contact Discharge

15 kV: Air-Gap Discharge

15 kV: Human Body Model

EFT Fast Transient Burst Immunity (IEC1000-4-4) Low EMI Emissions (EN55022)

230 kbits/s Data Rate Guaranteed TSSOP Package Option

Upgrade for MAX202E, 232E, LT1181A

APPLICATIONS

General-Purpose RS-232 Data Link

Portable Instruments

PDAs

FUNCTIONAL BLOCK DIAGRAMS

5V INPUT

	0.1 F	C1+	+5V TO +10V VCC			C3	C5
	10V	C1–	VOLTAGE		V+
			DOUBLER			0.1 F	0.1 F
			+10V TO –10V V–			6.3V
	0.1 F	C2+				C4
	10V		VOLTAGE
		C2–				0.1 F
			INVERTER
						10V
	T1IN		T1			T1OUT	EIA/TIA-232
	CMOS
	INPUTS		T2			T2OUT	OUTPUTS
	T2IN
	R1OUT			R1		R1IN	EIA/TIA-232
	CMOS
	OUTPUTS		R2				INPUTS*
	R2OUT					R2IN
			GND	ADM202E

GENERAL DESCRIPTION

The ADM202E and ADM1181A are robust, high speed, 2-channel RS232/V.28 interface devices that operate from a single 5 V power supply. Both products are suitable for operation in harsh electrical environments and are compliant with the EU directive on EMC (89/336/EEC). Both the level of electromagnetic emissions and immunity are in compliance. EM immunity includes ESD protection in excess of ± 15 kV on all I/O lines, Fast Transient burst protection (1000-4-4) and Radiated Immunity (1000-4-3). EM emissions include radiated and conducted emissions as required by Information Technology Equipment EN55022, CISPR22.

The ADM202E and ADM1181A conform to the EIA-232E and CCITT V.28 specifications and operate at data rates up to 230 kbps.

Four external 0.1 F charge pump capacitors are used for the voltage doubler/inverter permitting operation from a single 5 V supply.

The ADM202E provides a robust pin-compatible upgrade for existing ADM202, ADM232L or MAX202E/MAX232E sockets. It is available in a 16-lead DIP, wide and narrow SO and also a space saving TSSOP package. The TSSOP package gives a 44% space saving over SOIC.

The ADM1181A provides a robust pin compatible upgrade for the LTC1181A, and it is available in 16-lead DIP and 16-lead SO packages.

REV. B

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.

*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT

5V INPUT

0.1 F	C1+	+5V TO +10V VCC					C5
10V	C1–	VOLTAGE		V+
		DOUBLER					0.1 F
						C3
							10V
		+10V TO –10V				0.1 F
0.1 F	C2+			V–	C4
						10V
10V		VOLTAGE
	C2–				0.1 F
		INVERTER
					10V
T1IN		T1			T1OUT	EIA/TIA-232
CMOS
INPUTS		T2			T2OUT	OUTPUTS
T2IN
R1OUT			R1		R1IN	EIA/TIA-232
CMOS
OUTPUTS		R2				INPUTS*
R2OUT					R2IN
		GND	ADM1181A

*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT

ORDERING GUIDE

	Temperature	Package	Package
Model	Range	Description	Option
ADM202EAN	–40°C to +85°C	Plastic DIP	N-16
ADM202EARW	–40°C to +85°C	Wide SOIC	R-16W
ADM202EARN	–40°C to +85°C	Narrow SOIC	R-16N
ADM202EARU	–40°C to +85°C	TSSOP	RU-16
ADM1181AAN	–40°C to +85°C	Plastic DIP	N-16
ADM1181AARW	–40°C to +85°C	Wide SOIC	R-16W

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: [phone]	World Wide Web Site: http://www.analog.com
Fax: [phone]	© Analog Devices, Inc., 2001

				(VCC = 5.0 V 10%, C1–C4 = 0.1 F. All specifications
ADM202E/ADM1181A–SPECIFICATIONS TMIN to TMAX unless otherwise noted.)
Parameter	Min	Typ	Max	Unit	Test Conditions/Comments
DC CHARACTERISTICS
Operating Voltage Range	4.5	5.0	5.5	Volts
VCC Power Supply Current		2.5	6.0	mA	No Load
		13	18	mA	RL = 3 kΩ to GND
LOGIC
Input Logic Threshold Low, VINL			0.8	V	TIN
Input Logic Threshold High, VINH	2.4			V	TIN
CMOS Output Voltage Low, VOL			0.4	V	IOUT = 3.2 mA
CMOS Output Voltage High, VOH	3.5			V	IOUT = –1 mA
Logic Pull-Up Current		12	±25	µA	TIN = 0 V
RS-232 RECEIVER
EIA-232 Input Voltage Range	–30		+30	V
EIA-232 Input Threshold Low	0.4	1.2		V
EIA-232 Input Threshold High		1.6	2.4	V
EIA-232 Input Hysteresis		0.4		V
EIA-232 Input Resistance	3	5	7	kΩ	TA = 0°C to 85°C
RS-232 TRANSMITTER	±5.0	±9.0
Output Voltage Swing				Volts	All Transmitter Outputs
					Loaded with 3 kΩ to Ground
Transmitter Output Resistance	300	±10	±60	Ω	VCC = 0 V, VOUT = ±2 V
RS-232 Output Short Circuit Current				mA
TIMING CHARACTERISTICS					RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF
Maximum Data Rate	230			kbps
Receiver Propagation Delay				µs
TPHL		0.1	1
TPLH		0.3	1	µs	RL = 3 kΩ, CL = 1000 pF
Transmitter Propagation Delay		1.0	1.5	µs
Transition Region Slew Rate	3	8	30	V/µs	RL = 3 kΩ, CL = 1000 pF
					Measured from +3 V to –3 V or
					–3 V to +3 V
EM IMMUNITY		±15
ESD Protection (I/O pins)				kV	Human Body Model
		±15		kV	IEC1000-4-2 Air Discharge
		±8 kV		kV	IEC1000-4-2 Contact Discharge
EFT Protection (I/O pins)		±2		kV	IEC1000-4-4
EMI Immunity		10		V/m	IEC1000-4-3

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS*

(TA = 25°C unless otherwise noted)

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . –0.3 V to +6 V
V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . .	(VCC – 0.3 V) to +14 V
V– . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . +0.3 V to –14 V
Input Voltages
TIN . . . . . . . . . . . . . . . . . . . . . . . . . .	–0.3 V to (V+, +0.3 V)
RIN . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . ±30 V
Output Voltages	±15 V
TOUT . . . . . . . . . . . . . . . . . . . . . . . .
ROUT . . . . . . . . . . . . . . . . . . . . . . .	–0.3 V to (VCC + 0.3 V)
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . Continuous
Power Dissipation
Power Dissipation N-16 . . . . . . . . . . .	. . . . . . . . . . . 450 mW
(Derate 6 mW/°C above 50°C)	117°C/W
θJA, Thermal Impedance . . . . . . . . .

Power Dissipation R-16 . . . . . . . . . . . . . . . . .	.	. . . . . 450 mW
(Derate 6 mW/°C above 50°C)		158°C/W
θJA, Thermal Impedance . . . . . . . . . . . . . .	.
Power Dissipation RU-16 . . . . . . . . . . . . . . .	.	. . . . . 500 mW
(Derate 6 mW/°C above 50°C)		158°C/W
θJA, Thermal Impedance . . . . . . . . . . . . . .	.
Operating Temperature Range		–40°C to +85°C
Industrial (A Version) . . . . . . . . . . . . . . . .
Storage Temperature Range . . . . . . . . . . . .	–65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . .	.	. . . . . . . 300°C
ESD Rating (MIL-STD-883B) (I/O Pins) . . .	.	. . . . . . ±15 kV
ESD Rating (IEC1000-4-2 Air) (I/O Pins) . .	.	. . . . . . ±15 kV
ESD Rating (IEC1000-4-2 Contact) (I/O Pins)		. . . . . . ±8 kV
EFT Rating (IEC1000-4-4) (I/O Pins) . . . . .	.	. . . . . . . ±2 kV

*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.

–2–

REV. B

ADM202E/ADM1181A

PIN FUNCTION DESCRIPTION

Mnemonic

Function

VCC

Power Supply Input: 5 V ± 10%.

V+

Internally Generated Positive Supply

(+9 V nominal).

V–

Internally Generated Negative Supply

(–9 V nominal).

GND

Ground Pin. Must Be Connected to 0 V.

C1+, C1–

External Capacitor 1 is connected between

these pins. 0.1 µF capacitor is recommended

but larger capacitors up to 47 µF may be used.

C2+, C2–

External Capacitor 2 is connected between

these pins. 0.1 µF capacitor is recommended

but larger capacitors up to 47 µF may be used.

TIN

Transmitter (Driver) Inputs. These inputs

accept TTL/CMOS levels.

TOUT

Transmitter (Driver) Outputs. These are

RS-232 signal levels (typically ±9 V).

RIN

Receiver Inputs. These inputs accept RS-232

signal levels. An Internal 5 kΩ pull-down resis-

tor to GND is connected on each input.

ROUT

Receiver Outputs. These are CMOS output

logic levels.

5V INPUT

0.1 F

C1+

+5V TO +10V V

CC

C3

10V

C1–

VOLTAGE

C5

DOUBLER V+

0.1 F

0.1 F

+10V TO –10V V–

6.3V

0.1 F

C2+

C4

10V

C2–

VOLTAGE

0.1 F

INVERTER

10V

T1IN

T1

T1OUT

EIA/TIA-232

CMOS

INPUTS

T2

T2OUT

OUTPUTS

T2IN

R1OUT

R1

R1IN

EIA/TIA-232

CMOS

OUTPUTS

INPUTS*

R2OUT

R2

R2IN

GND

ADM202E

*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT

ADM202E Typical Operating Circuit

PIN CONNECTIONS

C1+				VCC
	1		16
V+
	2		15	GND
C1–		ADM202E
	3		14	T1OUT
C2+		ADM1181A		R1IN
	4		13
C2–		TOP VIEW
	5		12	R1OUT
V–		(Not to Scale)		T1IN
	6		11
T2OUT				T2IN
	7		10
R2IN				R2OUT
	8		9

					5V INPUT
0.1 F	C1+	+5V TO +10V VCC					C5
10V	C1–	VOLTAGE		V+
		DOUBLER					0.1 F
						C3
							10V
		+10V TO –10V				0.1 F
0.1 F	C2+			V–	C4
						10V
10V		VOLTAGE
	C2–				0.1 F
		INVERTER
					10V
T1IN		T1			T1OUT	EIA/TIA-232
CMOS
INPUTS		T2			T2OUT	OUTPUTS
T2IN
R1OUT			R1		R1IN	EIA/TIA-232
CMOS
OUTPUTS			R2			INPUTS*
R2OUT					R2IN
		GND	ADM1181A

*INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT

ADM1181A Typical Operating Circuit

REV. B

–3–

ADM202E/ADM1181A

GENERAL DESCRIPTION

The ADM202E/ADM1181E are ruggedized RS-232 line drivers/ receivers. Step-up voltage converters coupled with level shifting transmitters and receivers allow RS-232 levels to be developed while operating from a single 5 V supply.

Features include low power consumption, high transmission rates and compatibility with the EU directive on Electromagnetic compatibility. EM compatibility includes protection against radiated and conducted interference including high levels of Electrostatic Discharge.

All inputs and outputs contain protection against Electrostatic Discharges up to ±15 kV and Electrical Fast Transients up to

±2 kV. This ensures compliance to IE1000-4-2 and IEC1000-4-4 requirements.

The devices are ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently being plugged/unplugged. They are also immune to high RF field strengths without special shielding precautions.

CMOS technology is used to keep the power dissipation to an absolute minimum allowing maximum battery life in portable applications.

The ADM202E/ADM1181A is a modification, enhancement and improvement to the AD230–AD241 family and its derivatives. It is essentially plug-in compatible and does not have materially different applications.

CIRCUIT DESCRIPTION

The internal circuitry consists of four main sections. These are:

1.A charge pump voltage converter

2.5 V logic to EIA-232 transmitters

3.EIA-232 to 5 V logic receivers.

4.Transient protection circuit on all I/O lines

Charge Pump DC-DC Voltage Converter

The charge pump voltage converter consists of an 200 kHz 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 increased if desired. On the ADM202E, capacitor C3 is shown connected between V+ and VCC, while it is connected between V+ and GND on the ADM1181A. It is acceptable to use either configuration with both the ADM202E and ADM1181A. If desired, larger capacitors (up to 47 µF) can be used for capacitors C1–C4. This facilitates direct substitution with older generation charge pump RS-232 transceivers.

S1	S3
VCC	V+ = 2VCC
C1	C3
S2	S4
GND	VCC

INTERNAL

OSCILLATOR

NOTE: C3 CONNECTS BETWEEN V+ AND GND ON THE ADM1181A

Figure 1. Charge Pump Voltage Doubler

	V+	S1	S3
			GND
	FROM
	VOLTAGE	C2	C4
	DOUBLER	S2	S4
	GND
			V– = –(V+)
	INTERNAL
	OSCILLATOR

Figure 2. Charge Pump Voltage Inverter

Transmitter (Driver) Section

The drivers convert 5 V logic input levels into RS-232 output levels. With VCC = 5 V and driving an RS-232 load, the output voltage swing is typically ±9 V.

Receiver Section

The receivers are inverting level shifters which accept RS-232 input levels and translate them into 5 V logic output levels. The inputs have internal 5 kΩ pull-down resistors to ground and are also protected against overvoltages of up to ± 30 V.

Unconnected inputs are pulled to 0 V by the internal 5 kΩ pulldown resistor. This, therefore, 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 0.5 V. This ensures error-free reception for both noisy inputs and for inputs with slow transition times.

HIGH BAUD RATE

The ADM202E/ADM1181A feature high slew rates permitting data transmission at rates well in excess of the EIA/RS-232-E specifications. RS-232 voltage levels are maintained at data rates up to 230 kb/s even under worst case loading conditions. This allows for high speed data links between two terminals or indeed it is suitable for the new generation ISDN modem standards which requires data rates of 230 kbps. The slew rate is internally controlled to less than 30 V/µs in order to minimize EMI interference.

–4–

REV. B