Analog Devices AD622AR-REEL7, AD622AR-REEL, AD622AR, AD622AN Datasheet

a		Low Cost
		Instrumentation Amplifier
		AD622

FEATURES Easy to Use

Low Cost Solution

Higher Performance than Two or Three Op Amp Design Unity Gain with No External Resistor

Optional Gains with One External Resistor (Gain Range 2 to 1000)

Wide Power Supply Range (62.6 V to 615 V)

Available in 8-Lead PDIP and SOIC

Low Power, 1.5 mA max Supply Current

GOOD DC PERFORMANCE

0.15% Gain Accuracy (G = 1)

125 mV max Input Offset Voltage

1.0 mV/8C max Input Offset Drift

5 nA max Input Bias Current

66 dB min Common-Mode Rejection Ratio (G = 1)

NOISE

12 nV/√Hz @ 1 kHz Input Voltage Noise 0.60 mV p-p Noise (0.1 Hz to 10 Hz, G = 10)

EXCELLENT AC CHARACTERISTICS 800 kHz Bandwidth (G = 10)

10 ms Settling Time to 0.1% @ G = 1–100 1.2 V/ms Slew Rate

APPLICATIONS

Transducer Interface

Low Cost Thermocouple Amplifier

Industrial Process Controls

Difference Amplifier

Low Cost Data Acquisition

CONNECTION DIAGRAM

RG	1		8	RG
–IN 2			7	+VS
+IN	3		6	OUTPUT
–V	4	AD622	5	REF
S

PRODUCT DESCRIPTION

The AD622 is a low cost, moderately accurate instrumentation amplifier that requires only one external resistor to set any gain between 2 and 1,000. Or for a gain of 1, no external resistor is required. The AD622 is a complete difference or subtracter amplifier “system” while providing superior linearity and commonmode rejection by incorporating precision laser trimmed resistors.

The AD622 replaces low cost, discrete, two or three op amp instrumentation amplifier designs and offers good commonmode rejection, superior linearity, temperature stability, reliability, and board area consumption. The low cost of the AD622 eliminates the need to design discrete instrumentation amplifiers to meet stringent cost targets. While providing a lower cost solution, it also provides performance and space improvements.

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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.

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Fax: [phone]	© Analog Devices, Inc., 1999

AD622–SPECIFICATIONS (typical @ +258C, VS = 615 V, and RL = 2 kV unless otherwise noted)

			AD622
Model	Conditions	Min	Typ	Max	Units
GAIN	G = 1 + (50.5 k/RG)
Gain Range	VOUT = ±10 V	1		1000
Gain Error1
G = 1			0.05	0.15	%
G = 10			0.2	0.50	%
G = 100			0.2	0.50	%
G = 1000			0.2	0.50	%
Nonlinearity,	VOUT = ±10 V
G = 1–1000	RL = 10 kΩ		10		ppm
G = 1–100	RL = 2 kΩ		10		ppm
Gain vs. Temperature	Gain = 1			10	ppm/°C
	Gain >11			–50	ppm/°C
VOLTAGE OFFSET	(Total RTI Error = VOSI + VOSO/G)
Input Offset, VOSI	VS = ±5 V to ± 15 V		60	125	µV
Average TC	VS = ±5 V to ± 15 V			1.0	µV/°C
Output Offset, VOSO	VS = ±5 V to ± 15 V		600	1500	µV
Average TC	VS = ±5 V to ±15 V			15	µV/°C
Offset Referred to the
Input vs.	VS = ±5 V to ± 15 V
Supply (PSR)
G = 1		80	100		dB
G = 10		95	120		dB
G = 100		110	140		dB
G = 1000		110	140		dB
INPUT CURRENT
Input Bias Current			2.0	5.0	nA
Average TC			3.0		pA/°C
Input Offset Current			0.7	2.5	nA
Average TC			2.0		pA/°C
INPUT
Input Impedance					GΩipF
Differential			10i2
Common-Mode	VS = ±2.6 V to ± 5 V		10i2		GΩipF
Input Voltage Range2		–VS + 1.9		+VS – 1.2	V
Over Temperature	VS = ±5 V to ± 18 V	–VS + 2.1		+VS – 1.3	V
		–VS + 1.9		+VS – 1.4	V
Over Temperature		–VS + 2.1		+VS – 1.4	V
Common-Mode Rejection
Ratio DC to 60 Hz with
1 kΩ Source Imbalance	VCM = 0 V to ±10 V
G = 1		66	78		dB
G = 10		86	98		dB
G = 100		103	118		dB
G = 1000		103	118		dB
OUTPUT	RL = 10 kΩ,
Output Swing
	VS = ±2.6 V to ± 5 V	–VS + 1.1		+VS – 1.2	V
Over Temperature	VS = ±5 V to ±18 V	–VS + 1.4		+VS – 1.3	V
		–VS + 1.2		+VS – 1.4	V
Over Temperature		–VS + 1.6	±18	+VS – 1.5	V
Short Current Circuit					mA

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						AD622
				AD622
Model	Conditions		Min	Typ	Max	Units
DYNAMIC RESPONSE
Small Signal –3 dB Bandwidth
G = 1				1000		kHz
G = 10				800		kHz
G = 100				120		kHz
G = 1000				12		kHz
Slew Rate				1.2		V/µs
Settling Time to 0.1%	10 V Step					µs
G = 1–100				10
NOISE
Voltage Noise, 1 kHz	Total RTI Noise =	(e2 ni ) +(eno / G )2				nV/√Hz
Input, Voltage Noise, eni				12
Output, Voltage Noise, eno				72		nV/√Hz
RTI, 0.1 Hz to 10 Hz
G = 1				4.0		µV p-p
G = 10				0.6		µV p-p
G = 100–1000				0.3		µV p-p
Current Noise	f = 1 kHz			100		fA/√Hz
0.1 Hz to 10 Hz				10		pA p-p
REFERENCE INPUT						kΩ
RIN				20
IIN	VIN+, VREF = 0			+50	+60	µA
Voltage Range			–VS + 1.6	1 ± 0.0015	+VS – 1.6	V
Gain to Output
POWER SUPPLY			±2.6		±18
Operating Range3	VS = ± 2.6 V to ±18 V					V
Quiescent Current				0.9	1.3	mA
Over Temperature				1.1	1.5	mA
TEMPERATURE RANGE
For Specified Performance				–40 to +85		°C

NOTES

1Does not include effects of external resistor RG. 2One input grounded. G = 1.

3This is defined as the same supply range that is used to specify PSR.

Specifications subject to change without notice.

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AD622

ABSOLUTE MAXIMUM RATINGS1	±18 V
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation2 . . . . . . . . . . . . . .	. . . . . . 650 mW
Input Voltage (Common Mode) . . . . . . . . . .	. . . . . . . . . ±VS
Differential Input Voltage . . . . . . . . . . . . . . .	. . . . . . . . ±25 V
Output Short Circuit Duration . . . . . . . . . . .	. . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . .	–65°C to +125°C
Operating Temperature Range	–40°C to +85°C
AD622A . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature Range	+300°C
(Soldering 10 seconds) . . . . . . . . . . . . . . . .

NOTES

1Stresses 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 section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

2Specification is for device in free air: 8-Lead Plastic Package: θJA = 95°C/Watt 8-Lead SOIC Package: θJA = 155°C/Watt

ORDERING GUIDE

	Temperature	Package
Model	Range	Option*
AD622AN	–40°C to +85°C	N-8
AD622AR	–40°C to +85°C	SO-8
AD622AR-REEL	–40°C to +85°C	13" Reel
AD622AR-REEL7	–40°C to +85°C	7" Reel

*N = Plastic DIP, SO = Small Outline.

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 AD622 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

Typical Characteristics (@ +258C, VS = 615 V, RL = 2 kV, unless otherwise noted)

	50
	40			SAMPLE SIZE = 191
UNITS
	30
OF
PERCENTAGE	20
	10
	0
				–0.80		–0.40							0		0.40		0.80		1.00
	–1.00

OUTPUT OFFSET VOLTAGE – mV

Figure 1. Typical Distribution of Output Offset Voltage

	50
	40			SAMPLE SIZE = 383
UNITS
OF	30
PERCENTAGE	20
	10
	0
				80				100		120		140
	60

COMMON-MODE REJECTION RATIO – dB

Figure 2. Typical Distribution of Common-Mode Rejection

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