Analog Devices AD708BQ, AD708BH, AD708AQ, AD708AH, AD708SQ Datasheet

a		Ultralow Offset Voltage
		Dual Op Amp
		AD708

FEATURES

Very High DC Precision

30 mV max Offset Voltage

0.3 mV/8C max Offset Voltage Drift

0.35 mV p-p max Voltage Noise (0.1 Hz to 10 Hz)

5 Million V/V min Open Loop Gain

130 dB min CMRR

120 dB min PSRR Matching Characteristics

30 mV max Offset Voltage Match

0.3 mV/8C max Offset Voltage Drift Match

130 dB min CMRR Match Single Version: AD707

Available in 8-Pin Plastic Mini-DIP, Hermetic Cerdip and TO-99 Metal Can

Packages, Chips and /883B Parts Available.

PRODUCT DESCRIPTION

The AD708 is a very high precision, dual monolithic operational amplifier. Each amplifier individually offers excellent dc precision with the best available max offset voltage and offset voltage drift of any dual bipolar op amp. In addition, the matching specifications are the best available in any dual op amp.

The AD708 sets a new standards for dual precision op amps by providing 5 V/μV min open loop gain and guaranteed max input voltage noise of 350 nV p-p (0.1 Hz to 10 Hz). All dc specifications show excellent stability over temperature, with offset voltage drift typically 0.1 μV/°C and input bias current drift of 25 pA/°C max. Both CMRR (130 dB min) and PSRR (120 dB min) are an order of magnitude improved over any available single monolithic op amp except the AD707.

The AD708 is available in four performance grades. The AD708J is rated over the commercial temperature range of 0°C to +70°C and jis available in a plastic mini-DIP package. The AD708A and AD708B are rated over the industrial temperature range of –40°C to +85°C and are available in a cerdip and TO99 package. The AD708S is rated over the military temperature range of –55°C to +125°C and is available in cerdip and TO-99 packages. Military versions are available processed to MIL- STD-883B, Rev. C.

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 DIAGRAMS

TO-99 (H) Package

Plastic (N ), and Cerdip (Q) Packages

APPLICATION HIGHLIGHTS

1.The combination of outstanding matching and individual specifications make the AD708 ideal for constructing high gain, precision instrumentation amplifiers.

2.The low offset voltage drift and low noise of the AD708 allows the designer to amplify very small signals without sacrificing overall system performance.

3.The AD708’s 10 V/μV typical open loop gain and 140 dB common-mode rejection make it ideal for precision applications.

4.Unmounted dice are available for hybrid circuit applications.

5.The AD708 is an improved replacement for the LT1002.

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

AD708–SPECIFICATIONS (@ +258C and 615 V dc, unless otherwise noted)

			AD708J/A			AD708B			AD708S
Model	Conditions	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max	Units
INPUT OFFSET VOLTAGE1			30	100		5	50		5	30	mV
	TMIN to TMAX		50	150		15	65		15	50	mV
Drift			0.3	1.0		0.1	0.4		0.1	0.3	mV/°C
Long Term Stability			0.3			0.3			0.3		mV/Month
INPUT BIAS CURRENT			1.0	2.5		0.5	1.0		0.5	1	nA
	TMIN to TMAX		2.0	4.0		1.0	2.0		1.0	4	nA
Average Drift			15	40		10	25		10	30	pA/°C
OFFSET CURRENT	VCM = 0 V		0.5	2.0		0.1	1.0		0.1	1	nA
	TMIN to TMAX		2.0	4.0		0.2	1.5		0.2	1.5	nA
Average Drift			2	60		1	25		1	25	pA/°C
MATCHING CHARACTERISTICS2											mV
Offset Voltage				80			50			30
	TMIN to TMAX			150			75			50	mV
Offset Voltage Drift				1.0			0.4			0.3	mV/°C
Input Bias Current				4.0			1.0			1.0	nA
	TMIN to TMAX	120		5.0	130		2.0	130		2.0	nA
Common-Mode Rejection			140			140			140		dB
	TMIN to TMAX	110			130			130			dB
Power Supply Rejection		110			120			120			dB
	TMIN to TMAX	110			120			120			dB
Channel Separation		135			140			140			dB
INPUT VOLTAGE NOISE	0.1 Hz to 10 Hz		0.23	0.6		0.23	0.6		0.23	0.35	mV p-p
	f = 10 Hz		10.3	18		10.3	12		10.3	12	nV/Ö	Hz
	f = 100 Hz		10.0	13.0		10.0	11.0		10.0	11	nV/Ö	Hz
	f = 1 kHz		9.6	11.0		9.6	11.0		9.6	11	nV/Ö	Hz
INPUT CURRENT NOISE	0.1 Hz to 10 Hz		14	35		14	35		14	35	pA p-p
	f = 10 Hz		0.32	0.9		0.32	0.8		0.32	0.8	pA/Ö	Hz
	f = 100 Hz		0.14	0.27		0.14	0.23		0.14	0.23	pA/Ö	Hz
	f = 1 kHz		0.12	0.18		0.12	0.17		0.12	0.17	pA/Ö	Hz
COMMON-MODE	VCM = ± 13 V
REJECTION RATIO		120	140		130	140		130	140		dB
	TMIN to TMAX	120	140		130	140		130	140		dB
OPEN-LOOP GAIN	VO = ±10 V
	RLOAD ³ 2 kW	3	10		5	10		4	10		V/mV
	TMIN to TMAX	3	10		5	10		4	7		V/mV
POWER SUPPLY	VS = ±3 V to ±18 V
REJECTION RATIO		110	130		120	130		120	130		dB
	TMIN to TMAX	110	130		120	130		120	130		dB
FREQUENCY RESPONSE
Closed Loop Bandwidth		0.5	0.9		0.5	0.9		0.5	0.9		MHz
Slew Rate		0.15	0.3		0.15	0.3		0.15	0.3		V/ms
INPUT RESISTANCE											MW
Differential			60			200			200
Common Mode			200			400			400		GW
OUTPUT VOLTAGE	RLOAD ³ 10 kW	13.5	14		13.5	14.0		13.5	14		± V
	RLOAD ³ 2 kW	12.5	13.0		12.5	13.0		12.5	13		± V
	RLOAD ³ 1 kW	12.0	12.5		12.0	12.5		12.0	12.5		± V
	RLOAD ³ 2 kW							12.0			± V
	TMIN to TMAX	12.0	13.0		12.0	13.0			13
OPEN-LOOP OUTPUT											W
RESISTANCE			60			60			60

–2–

REV. B

								AD708
		AD708J/A		AD708B		AD708S
Model	Conditions	Min Typ	Max	Min Typ	Max	Min Typ	Max	Units
POWER SUPPLY
Quiescent Current	VS = ±15 V	4.5	5.5	4.5	5.5	4.5	5.5	mA
Power Consumption			165		165		165
	No Load	135		135		135		mW
	VS = ±3 V	12	18	12	18	12	18	mW
Operating Range		±3	±18	±3	±18	±3	±18	V

NOTES

1Input offset voltage specifications are guaranteed after 5 minutes of operation at T A = +25°C. 2Matching is defined as the difference between parameters of the two amplifiers.

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.

ABSOLUTE MAXIMUM RATINGS1

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±22 V

Internal Power Dissipation2

Input Voltage3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite

Differential Input Voltage . . . . . . . . . . . . . . . . . . +VS and –VS Storage Temperature Range (Q, H) . . . . . . . –65°C to +150°C Storage Temperature Range (N) . . . . . . . . . –65°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.

2Thermal Characteristics

8-Pin Plastic Package: θJC = 33°C/Watt, θJA = 100°C/Watt 8-Pin Cerdip package: θJC = 30°C/Watt, θJA = 110°C/Watt 8-Pin Metal Can Package: θJC = 65°C/Watt, θJA = 150°C/Watt.

3For supply voltages less than ±22 V, the absolute maximum input voltage is equal to the supply voltage.

METALIZATION PHOTOGRAPH

Dimensions shown in inches and (mm).

Contact factory for latest dimensions.

ORDERING GUIDE

	Temperature	Package	Package
Model	Range	Description	Option*
AD708JN	0°C to +70°C	8-Pin Plastic DIP	N-8
AD708AQ	–40°C to +85°C	8-Pin Cerdip	Q-8
AD708BQ	–40°C to +85°C	8-Pin Cerdip	Q-8
AD708SQ	–55°C to +125°C	8-Pin Cerdip	Q-8
AD708AH	–40°C to +85°C	8-Pin Header	H-08A
AD708BH	–40°C to +85°C	8-Pin Header	H-08A
AD708SH	–55°C to +125°C	8-Pin Header	H-08A
AD708SH/883B	–55°C to +125°C	8-Pin Header	H-08A
AD708J Grade Chips	0°C to +70°C	Die
AD708S Grade Chips	–55°C to +125°C	Die

*N = Plastic DIP; Q = Cerdip; H = Hermetic Metal Can.

REV. B

–3–