Analog Devices AD260AND-5, AD260AND-4, AD260AND-3, AD260AND-2, AD260AND-0 Datasheet

a	High Speed, Logic Isolator
	with Power Transformer

FEATURES

IsoLogic™ Circuit Architecture Isolation Test Voltage: To 3.5 kV rms

Five Isolated Logic Lines: Available in Six I/O Configurations Logic Signal Bandwidth: 20 MHz (Min), 40 mbps (NRZ) Isolated Power Transformer: 37 V p-p, 1.5 W Max

CMV Transient Immunity: 10 kV/ms Min Waveform Edge Transmission Symmetry: 61 ns

Field and System Output Enable/Three-State Functions Performance Rated Over –258C to +858C

UL1950, IEC950, EN60950 Certification, Pending

APPLICATIONS

PLC/DCS Analog Input and Output Cards

Communications Bus Isolation

General Data Acquisition Applications

IGBT Motor Drive Controls

High Speed Digital I/O Ports

GENERAL DESCRIPTION

The AD260 is designed using Analog Devices new IsoLogic circuit architecture to isolate five digital control signals to/ from a microcontroller and its related field I/O components. Six models allow all I/O combinations from five input lines to five output lines, including combinations in between. Every AD260 effectively replaces up to five opto-isolators while also providing the 1.5 W transformer for a 3.5 kV isolated dc-dc power supply circuit.

Each line of the AD260 has a bandwidth of 20 MHz (min) with a propagation delay of only 14 ns, which allows for extremely fast data transmission. Output waveform symmetry is maintained to within ±1 ns of the input so the AD260 can be used to accurately isolate time-based PWM signals.

All field or system output pins of the AD260 can be set to a high resistance three-state level by use of the two enable pins. A field output three-stated offers a convenient method of presetting logic levels at power-up by use of pull-up/down resistors. System side outputs being three-stated allows for easy multiplexing of multiple AD260s.

The isolation barrier of the AD260 B Grade is 100% tested at 3.5 kV rms (system to field). The barrier design also provides excellent common-mode transient immunity from 10 kV/ s common-mode voltage excursions of field side terminals relative to the system side, with no false output triggering on either side.

Each output is updated within nanoseconds by input logic transitions, the AD260 also has a continuous output update feature that automatically updates each output based on the dc level of

IsoLogic is a trademark of Analog Devices, Inc.

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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.

					AD260
	FUNCTIONAL BLOCK DIAGRAM
		AD260		LATCH
F0 18		TRISTATE	LINE 0	D	1	S0
				E
				LATCH
F1	19	TRISTATE	LINE 1	D	2	S1
				E
				LATCH		S2
F2	20	TRISTATE	LINE 2	D	3
				E
		LATCH
F3	21	D	LINE 3	TRISTATE	4	S3
		E
		LATCH
F4	22	D	LINE 4	TRISTATE	5	S4
		E
ENABLEFLD	17				6	ENABLESYS
+5VdcFLD	16	+5Vdc			+5Vdc	+5VdcSYS
					7
5V RTNFLD		5Vdc RTN			5Vdc RTN	5V RTNSYS
	15				8
PWRAFLD		17V p-p OUT			DRIVE	DRVA
	14				9
PWRCTFLD		CT OUT			+5V	DRVCT
	13				10
PWRBFLD		17V p-p OUT			DRIVE	DRVB
	12	FIELD			11
				SYSTEM

the input. This guarantees the output is always valid 10 s after a fault condition or after the power-up reset interval.

The AD260 also has an integral center tap transformer for generating isolated power. Typically driven by a 5 V push-pull drive at the primary, it will generate a 37 V p-p output capable of supplying up to 1.5 W. This can then be regulated to the desired voltage, including ±5 V dc for circuit components and

24 V for a 20 mA loop supply when needed.

PRODUCT HIGHLIGHTS

Six Isolated Logic Line I/O Configurations Available: The AD260 is available in six pin-compatible versions of I/O configurations to meet a wide variety of requirements.

Wide Bandwidth with Minimal Edge Error: The AD260 with IsoLogic affords extremely fast isolation of logic signals due to its 20 MHz bandwidth and 14 ns propagation delay. It maintains a waveform input-to-output edge transition error of typically less than ±1 ns (total) for positive vs. negative transition.

3.5 kV rms Test Voltage Isolation Rating: The AD260 B Grade is rated to operate at 1.25 kV rms and is 100% pro-

duction tested at 3.5 kV rms, using a standard ADI test method.

High Transient Immunity: The AD260 rejects commonmode transients slewing at up to 10 kV/ s without false triggering or damage to the device.

(Continued on page 6)

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., 1998

AD260–SPECIFICATIONS (Typical at TA = +258C, +5 V dcSYS, +5 V dcFLD, tRR = 50 ns max unless otherwise noted)

Parameter	Conditions	Min	Typ	Max	Units
INPUT CHARACTERISTICS
Threshold Voltage
Positive Transition (VT+)	+5 V dcSYS = 4.5 V	2.0	2.7	3.15	V
	+5 V dcSYS = 5.5 V	3.0	3.2	4.2	V
Negative Transition (VT–)	+5 V dcSYS = 4.5 V	0.9	1.8	2.2	V
Hysteresis Voltage (VH)	+5 V dcSYS = 5.5 V	1.2	2.2	3.0	V
	+5 V dcSYS = 4.5 V	0.4	0.9	1.4	V
Input Capacitance (CIN)	+5 V dcSYS = 5.5 V	0.5	1.0	1.5	V
			5		pF
Input Bias Current (IIN)	Per Input		0.5		µA
OUTPUT CHARACTERISTICS
Output Voltage1
High Level (VOH)	+5 V dcSYS = 4.5 V, |IO| = 0.02 mA	4.4			V
Low Level (VOL)	+5 V dcSYS = 4.5 V, |IO| = 4 mA	3.7			V
	+5 V dcSYS = 4.5 V, |IO| = 0.02 mA			0.1	V
	+5 V dcSYS = 4.5 V, |IO| = 4 mA			0.4	V
Output Three-State Leakage Current	ENABLESYS/FLD @ Logic Low/High Level Respectively		0.5		µA
DYNAMIC RESPONSE 1 (Refer to Figure 2)
Max Logic Signal Frequency (fMIN)	50% Duty Cycle, +5 V dcSYS = 5 V	20	±1		MHz
Waveform Edge Symmetry Error (tERROR)	tPHL vs. tPLH				ns
Logic Edge Propagation Delay (tPHL, tPLH)			14	25	ns
Minimum Pulsewidth (tPWMIN)		25			ns
Max Output Update Delay on Fault or After
Power-Up Reset Interval (≈ 30 µs)2			12		µs
ISOLATION BARRIER RATING3
Operating Isolation Voltage (VCMV)	AD260A			375	V rms
Isolation Rating Test Voltage (VCMV TEST)4	AD260B			1250	V rms
	AD260A	1750			V rms
	AD260B	3500			V rms
Transient Immunity (VTRANSIENT)		10,000			V/µs
Isolation Mode Capacitance (CISO)	Total Capacitance, All Lines and Transformer		14	18	pF
Capacitive Leakage Current (ILEAD)	240 V rms @ 60 Hz			2	µA rms
POWER TRANSFORMER
Primary Winding	Bifilar Wound, Center-Tapped
Inductance (LP)	Each Half		1		mH
Number of Turns (NP)	Each Half		26		Turns
Resistance	Each Half		0.6		Ω
Max Volt-Seconds (E × t)	Each Half			27	V × µs
Recommended Operating Frequency	–25°C to +85°C, Push-Pull Drive	150	200	300	kHz
Absolute Min Operating Frequency	–25°C to +85°C, Push-Pull Drive	75			kHz
Secondary Winding	Bifilar Wound, Center-Tapped
Number of Turns (NS)	Each Half		48		Turns
Resistance	Each Half		2.3		Ω
Insulation Withstand (VCMV TEST)	Primary to Secondary	3,500			V rms
Capacitance	Primary to Secondary		5		pF
Recommended Max Power	Rated Performance	1.0		1.5	W
POWER SUPPLY
Supply Voltage (+5 V dcSYS and +5 V dcFLD)	Rated Performance	4.5		5.5	V dc
	Operating	4.0		5.75	V dc
Power Dissipation Capacitance	Effective, per Input, Either Side		8		pF
	Effective per Output, Either Side—No Load		28		pF
Quiescent Supply Current	Each, +5 V dcSYS & FLD		4		mA
Supply Current	All Lines @ 10 MHz (Sum of +5 V dcSYS & FLD)		18		mA
TEMPERATURE RANGE					°C
Rated Performance (TA)5		–25		+85
Storage (TSTG)		–40		+85	°C

NOTES

1For best performance, bypass +5 V dc supplies to com. at or near the device (0.01 F). +5 V dc supplies are also internally bypassed with 0.05 F.

2As the supply voltage is applied to either side of the AD260, the internal circuitry will go into a power-up reset mode (all lines disabled) for about 30 s after the point where +5 V dcSYS & FLD passes above 3.3 V.

3“Operating” isolation voltage is derived from the Isolation Test Voltage in accordance with such methods as found in VDE-0883 wherein a device will be “hi-pot” tested at twice the operating voltage, plus one thousand volts. Partial discharge testing, with an acceptance threshold of 80 pC of discharge may be considered the same as a hi-pot test (but nondestructive).

4Partial Discharge at 80 pC THLD.

5Supply Current will increase slightly, but otherwise the unit will function within specification to –40°C.

Specifications are subject to change without notice.

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AD260

ABSOLUTE MAXIMUM RATINGS*

Parameter	Conditions	Min	Typ Max	Units
Supply Voltage (+5 V dcSYS & FLD)		–0.5	+6.0	V
DC Input Voltage (VIN MAX)	Referred to +5 V dcSYS & FLD and 5 V RTNSYS & FLD Respectively	–0.5	+0.5	V
DC Output Voltage (VOUT MAX)	Referred to +5 V RTNSYS & FLD and 5 V dcSYS & FLD Respectively	–0.5	+0.5	V
Clamp Diode Input Current (IIK)	For VI < –0.5 V or VI > 5 V RTNSYS & FLD +0.5 V	–25	+25	mA
Clamp Diode Output Current (IOK)	For VO < –0.5 V or VO > 5 V RTNSYS & FLD +0.5 V	–25	+25	mA
Output DC Current, per Pin (IOUT)		–25	+25	mA
DC Current, VCC or GND (ICC or IGND)		–50	+50	mA
Storage Temperature (TSTG)		–40	+85	°C
Lead Temperature (Soldering, 10 sec)			+300	°C
Electrostatic Protection (VESD)	Per MIL-STD-883, Method 3015	4.5	5	kV

*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods may effect device reliability.

I/O CONFIGURATIONS AVAILABLE

The AD260 is available in several configurations. The choice of model is determined by the desired number of input vs. output lines. All models have identical footprints with the power and enable pins always being in the same locations.

PIN FUNCTION DESCRIPTIONS

Pin		Mnemonic		Function
1–5*		S0 Through S4		Digital Xmt or Rcv from F0 Through F4
6		ENABLESYS		System Output Enable/Three-State
7		+5 V dcSYS		System Power Supply (+5 V dc Input)
8		5 V RTNSYS		System Power Supply Common
9–14				Not Present On Unit
15		5 V RTNFLD		Field Power Supply Common
16		+5 V dcFLD		Field Power Supply (+5 V Input)
17		ENABLEFLD		Field Output Enable/Three-State
18–22*		F0 Through F4		Digital Xmt or Rcv from S0 Through S4

*Function of pin determined by model. Refer to Table I.

Caution: Use care in handling unit as contaminants on the bottom side of the unit or the circuit card to which it is mounted will lead to reduced breakdown voltage across the isolation barrier.

ORDERING GUIDE

PIN CONFIGURATION

						1					S0
						2					S1
						3					S2
						4					S3
						5					S4
					SYSTEM 6
												ENABLE
												SYS
						7					+5VdcSYS
						8					5V RTNSYS
						9					DRVA
						10					DRVCT
						11					DRVB
					BOTTOM VIEW
PWRBFLD	12
PWRCTFLD	13
PWRAFLD					14
5V RTNFLD			15
+5VdcFLD					16	FIELD
ENABLEFLD			17
F0					18
F1			19
F2					20
F3			21
F4					22

Model Number	Description			Isolation Test Voltage	Package Description	Package Option
AD260AND-0	0	Inputs, 5 Outputs		1.75 kV rms	Plastic DIP	ND-22
AD260AND-1	1	Input, 4 Outputs		1.75 kV rms	Plastic DIP	ND-22
AD260AND-2	2	Inputs, 3 Outputs		1.75 kV rms	Plastic DIP	ND-22
AD260AND-3	3	Inputs, 2 Outputs		1.75 kV rms	Plastic DIP	ND-22
AD260AND-4	4	Inputs, 1 Output		1.75 kV rms	Plastic DIP	ND-22
AD260AND-5	5	Inputs, 0 Outputs		1.75 kV rms	Plastic DIP	ND-22
AD260BND-0	0	Inputs, 5 Outputs		3.5 kV rms	Plastic DIP	ND-22
AD260BND-1	1	Input, 4 Outputs		3.5 kV rms	Plastic DIP	ND-22
AD260BND-2	2	Inputs, 3	Outputs	3.5 kV rms	Plastic DIP	ND-22
AD260BND-3	3	Inputs, 2	Outputs	3.5 kV rms	Plastic DIP	ND-22
AD260BND-4	4	Inputs, 1	Output	3.5 kV rms	Plastic DIP	ND-22
AD260BND-5	5	Inputs, 0	Outputs	3.5 kV rms	Plastic DIP	ND-22

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD260 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

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