Analog Devices AD705TQ-883B, AD705TQ, AD705KN, AD705JR-REEL7, AD705JR-REEL Datasheet

a		Picoampere Input Current
		Bipolar Op Amp
		AD705

FEATURES

DC PERFORMANCE

25 mV max Offset Voltage (AD705T)

0.6 mV/8C max Drift (AD705K/T)

100 pA max Input Bias Current (AD705K)

600 pA max IB Over MIL Temperature Range (AD705T) 114 dB min CMRR (AD705K/T)

114 dB min PSRR (AD705T)

200 V/mV min Open Loop Gain

0.5 mV p-p typ Noise, 0.1 Hz to 10 Hz 600 mA max Supply Current

AC PERFORMANCE

0.15 V/μs Slew Rate

800 kHz Unity Gain Crossover Frequency

10,000 pF Capacitive Load Drive Capability

Low Cost

Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip

and Surface Mount (SOIC) Packages

MIL-STD-883B Processing Available

Dual Version Available: AD706

Quad Version: AD704

APPLICATIONS

Low Frequency Active Filters

Precision Instrumentation

Precision Integrators

PRODUCT DESCRIPTION

The AD705 is a low power bipolar op amp that has the low input bias current of a BiFET amplifier but which offers a significantly lower IB drift over temperature. The AD705 offers many of the advantages of BiFET and bipolar op amps without their inherent disadvantages. It utilizes superbeta bipolar input transistors to achieve the picoampere input bias current levels of FET input amplifiers (at room temperature), while its IB typically only increases 5 times vs. BiFET amplifiers which exhibit a 1000X increase over temperature. This means that, at room temperature, while a typical BiFET may have less IB than the AD705, the BiFET’s input current will increase to a level of several nA at +125°C. Superbeta bipolar technology also permits the AD705 to achieve the microvolt offset voltage and low noise characteristics of a precision bipolar input amplifier.

The AD705 is a high quality replacement for the industrystandard OP07 amplifier while drawing only one sixth of its power supply current. Since it has only 1/20th the input bias current of an OP07, the AD705 can be used with much higher source impedances, while providing the same level of dc precision. In addition, since the input bias currents are at picoAmp

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.

CONNECTION DIAGRAM

Plastic Mini-DIP (N)

Cerdip (Q) and

Plastic SOIC (R) Packages

	OFFSET	1	TOP VIEW	8	OFFSET
	NULL				NULL
	–IN	2		7	V+
	+IN	3		6	OUTPUT
	V–	4	AD705	5	OVER
					COMP

levels, the commonly used “balancing” resistor (connected between the noninverting input of a bipolar op amp and ground) is not required.

The AD705 is an excellent choice for use in low frequency active filters in 12and 14-bit data acquisition systems, in precision instrumentation and as a high quality integrator.

The AD705 is internally compensated for unity gain and is available in five performance grades. The AD705J and AD705K are rated over the commercial temperature range of 0°C to +70°C. The AD705A and AD705B are rated over the industrial temperature range of –40°C to +85°C. The AD705T is rated over the military temperature range of –55°C to +125°C and is available processed to MIL-STD-883B, Rev. C.

The AD705 is offered in three varieties of 8-pin package: plastic DIP, hermetic cerdip and surface mount (SOIC). “J” grade chips are also available.

PRODUCT HIGHLIGHTS

1.The AD705 is a low drift op amp that offers BiFET level

input bias currents, yet has the low IB drift of a bipolar amplifier. It upgrades the performance of circuits using op amps such as the LT1012.

2.The combination of Analog Devices’ advanced superbeta processing technology and factory trimming provides both low drift and high dc precision.

3.The AD705 can be used in applications where a chopper amplifier would normally be required but without the chopper’s inherent noise and other problems.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: [phone] Fax: [phone]

AD705–SPECIFICATIONS (@ TA = +258C, VCM = 0 V, and VS = 615 V dc, unless otherwise noted)

				AD705J/A			AD705K/B			AD705T
Parameter		Conditions	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max	Units
INPUT OFFSET VOLTAGE												mV
Initial Offset				30	90		10	35		10	25
Offset		TMIN to TMAX		45	150		25	60		25	60	mV
vs. Temp, Average TC		VS = ±2 V to ±18 V	110	0.2	1.2	110	0.2	0.6	114	0.2	0.6	mV/°C
vs. Supply (PSRR)				129			129			129		dB
TMIN to TMAX		VS = ±2.5 V to ±18 V	108	126		108	126		108	126		dB
Long Term Stability				0.3			0.3			0.3		mV/month
INPUT BIAS CURRENT1
		VCM = 0 V		60	150		30	100		30	100	pA
		VCM = ±13.5 V		80	200		50	150		50	150	pA
vs. Temp, Average TC				0.3			0.3			0.6	600	pA/°C
TMIN	to TMAX	VCM = 0 V		80	250		50	150		90		pA
TMIN	to TMAX	VCM = ±13.5 V		100	450		70	350		120	750	pA
INPUT OFFSET CURRENT		VCM = 0 V		40	150		30	100		30	100	pA
		VCM = ±13.5 V		40	200		30	150		30	150	pA
vs. Temp, Average TC				0.3			0.3			0.4	250	pA/°C
TMIN	to TMAX	VCM = 0 V		80	250		50	150		80		pA
TMIN	to TMAX	VCM = ±13.5 V		80	450		50	350		80	450	pA
FREQUENCY RESPONSE
Unity Gain
Crossover Frequency			0.4	0.8		0.4	0.8		0.4	0.8		MHz
Slew Rate, Unity Gain		G = –1	0.1	0.15		0.1	0.15		0.1	0.15		V/ms
Slew Rate		TMIN to TMAX	0.05	0.15		0.05	0.15		0.05	0.15		V/ms
INPUT IMPEDANCE												MWipF
Differential				40i2			40i2			40i2
Common Mode				300i2			300i2			300i2		GWipF
INPUT VOLTAGE RANGE			± 13.5	± 14		± 13.5	± 14		± 13.5	± 14
Common-Mode Voltage												V
COMMON-MODE		VCM = ±13.5 V
REJECTION RATIO			110	132		114	132		114	132		dB
		TMIN to TMAX	108	128		108	128		108	128		dB
INPUT VOLTAGE NOISE		0.1 Hz to 10 Hz		0.5			0.5	1.0		0.5	1.0	mV p-p
		f = 10 Hz		17			17			17		nV/Ö		Hz
		f = 1 kHz		15	22		15	22		15	22	nV/Ö		Hz
INPUT CURRENT NOISE		f = 10 Hz		50			50			50		fA/Ö
													Hz
OPEN-LOOP GAIN		VO = ±12 V
		RLOAD = 10 kW	300	2000		400	2000		400	2000		V/mV
		TMIN to TMAX	200	1500		300	1500		300	1500		V/mV
		VO = ±10 V
		RLOAD = 2 kW	200	1000		300	1000		300	1000		V/mV
		TMIN to TMAX	150	1000		200	1000		200	1000		V/mV
OUTPUT CHARACTERISTICS		RLOAD = 10 kW	± 13	± 14		± 13	± 14		± 13	± 14
Voltage Swing												V
		TMIN to TMAX	613	± 14		613	± 14		613	± 14		V
Current		Short Circuit		± 15			± 15			± 15		mA
Capacitive Load
Drive Capability		Gain = +1		10,000			10,000			10,000		pF
Output Resistance		Open Loop		200			200			200		W
POWER SUPPLY				± 15			± 15			± 15
Rated Performance			62.0		618	62.0		618	62.0		618	V
Operating Range												V
Quiescent Current				380	600		380	600		380	600	mA
		TMIN to TMAX		400	800		400	800		400	800	mA
TEMPERATURE RANGE
FOR RATED PERFORMANCE
Commercial (0°C to +70°C)				AD705J			AD705K
Industrial (–40°C to +85°C)				AD705A			AD705B
Military (–55°C to +125°C)										AD705T

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REV. B

AD705

			AD705J/A			AD705K/B			AD705T
Parameter	Conditions	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max	Units
PACKAGE OPTIONS
8-Pin Cerdip (Q-8)			AD705AQ			AD705BQ			AD705TQ
8-Pin Plastic Mini-DIP (N-8)			AD705JN			AD705KN
8-Pin SOIC (R-8)			AD705JR
Chips		AD705JCHIPS
TRANSISTOR COUNT	# of Transistors		45			45			45

NOTES

1Bias current specifications are guaranteed maximum at either input. All min and max specifications are guaranteed

Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. Specifications subject to change without notice.

METALIZATION PHOTOGRAPH

Dimensions shown in inches and (mm).

		0.074 (1.88)
NULL		+VS		VOUT
8		7		6
			7	6
8

5 OVER COMP

5

0.0677

(1.72)

		1
NULL 1		4		4 –VS
2

–IN 2

3

3

+IN

ABSOLUTE MAXIMUM RATINGS1	±18 V
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation2 . . . . . . . . . . . . .	. . . . . . 650 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . ±VS
Differential Input Voltage3 . . . . . . . . . . . . . .	. . . . . . . ±0.7 V
Output Short Circuit Duration . . . . . . . . . . .	. . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . .	–65°C to +125°C
Storage Temperature Range (Q) . . . . . . . . .	–65°C to +150°C
Operating Temperature Range	0°C to +70°C
AD705J/K . . . . . . . . . . . . . . . . . . . . . . . . .
AD705A/B . . . . . . . . . . . . . . . . . . . . . . . . .	–40°C to +85°C
AD705T . . . . . . . . . . . . . . . . . . . . . . . . . .	–55°C to +125°C
Lead Temperature Range (Soldering 60 sec) .	. . . . . . . +300°C

NOTES

1Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and 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-Pin Plastic Package:	θJA = 165°C/Watt
8-Pin Cerdip Package:	θJA = 110°C/Watt
8-Pin Small Outline Package:	θJA = 155°C/Watt

3The input pins of these amplifiers are protected by back-to-back diodes. If the differential voltage exceeds ± 0.7 V, external series protection resistors should be added to limit the input current to less than 25 mA.

ORDERING GUIDE

	Temperature	Package	Package
Model	Range	Description	Option
AD705AQ	–40°C to +85°C	8-Pin Ceramic DIP	Q-8
AD705BQ	–40°C to +85°C	8-Pin Ceramic DIP	Q-8
AD705JCHIPS	0°C to +70°C	Bare Die
AD705JN	0°C to +70°C	8-Pin Plastic DIP	N-8
AD705JR	0°C to +70°C	8-Pin Plastic SOIC	R-8
AD705JR-REEL	0°C to +70°C	8-Pin Plastic SOIC	R-8
AD705JR-REEL7	0°C to +70°C	8-Pin Plastic SOIC	R-8
AD705KN	0°C to +70°C	8-Pin Plastic DIP	N-8
AD705TQ	–55°C to +125°C	8-Pin Ceramic DIP	Q-8
AD705TQ/883B	–55°C to +125°C	8-Pin Ceramic DIP	Q-8

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 AD705 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

REV. B

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