Linear Technology LT1002 Datasheet

FEATURES

■	Guaranteed low offset voltage
	LT1002A	60μV max
	LT1002	100μV max
■	Guaranteed offset voltage match
	LT1002A	40μV max
	LT1002	80μV max
■	Guaranteed low drift
	LT1002A	0.9μV/°C max
	LT1002	1.3μV/°C max
■	Guaranteed CMRR
	LT1002A	110dB min
	LT1002	110dB min
■	Guaranteed channel separation
	LT1002A	132dB min
	LT1002	130dB min

■Guaranteed maching characteristics

■Low noise 0.35μV p-p

APPLICATIOUS

■Thermocouple Amplifiers

■Strain Gauge Amplifiers

■Low level signal processing

■Medical instrumentation

■Precision dual limit threshold detection

■Instrumentation amplifiers

LT1002

Dual, Matched Precision

Operational Amplifier

DESCRIPTIOU

The LT®1002 dual, matched precision operational amplifiers combine excellent individual amplifier performance with tight matching and temperature tracking between amplifiers.

In the design, processing, and testing of the device, particular attention has been paid to the optimization of the entire distribution of several key parameters and their matching. Consequently, the specifications of even the low cost commercial grade (the LT1002C) have been spectacularly improved compared to presently available devices.

Essentially, the input offset voltage of all units is less than 80μV, and matching between amplifiers is consistently beter than 60μV (see distribution plot below). Input bias and offset currents, channel separation, common mode and power suply rejections of the LT1002C are all specified at levels which were previsouly attainable only on very expensive, selected grades of other dual devices. Power dissipation is nearly halved compared to the most popular precision duals, without adversely affecting noise or speed performance. A by-product of lower dissipation is decreased warm-up drift. For even better performance in a single precision op amp, refer to the LT1001 data sheet. A bridge signal conditioning application is shown below. This circuit illustrates the requirement for both excellent matching and individual amplifier specifications.

, LTC and LT are registered trademarks of Linear Technology Corporation.

	Strain Gauge Signal Conditioner with Bridge Excitation
+15V
					+15V
8.2k					100Ω 5W
2.0K*		4	+
						REFERENCE OUT
					2k
				13		TO MONITORING
LM329	4.99k*	3	1/2LT1002		2N2219	A/D CONVERTER
			–
				IN4148
			350Ω BRIDGE			3	+	6	0 TO 10V
					*	10k	LT1001
									OUT
					301k	ZERO 2	–	1μF	340k*
		10	–	IN4148				GAIN	1.1k*
			1/2LT1002		2N2907			TRIM
				6
		11	+		2k
					100Ω
					5W
					–15V	*RN60C FILM RESISTORS			1002 TA01

Distribution of Offset Voltage Match

	70
																										VS = ±15V
	60																									TA = 25°C
																			287 UNITS TESTED
UNITS	50
	40
OF
NUMBER	30
	20
	10
	0
																						40											100
	–100 –80 –60 –40 –20																0		20							60					80

INPUT OFFSET VOLTAGE MATCH (μV)

1002 TA02

1

LT1002

ABSOLUTE WAXIWUW RATINGSU

Supply Voltage (Note 6).........................................	±22V
Differential Input Voltage ......................................	±30V
Input Voltage Equal to Supply Voltage
Output Short Circuit Duration .........................	Indefinite
Operating Temperature Range	– 55°C to 125°C
LT1002AM/LT1002M .......................
LT1002AC/LT1002C ...............................	0°C to 70°C
Storage Temperature Range	– 65°C to 150°C
All Grades .........................................
Lead Temperature (Soldering, 10 sec.).................	300°C

PACKAGE/ORDER IUFORWATIOU

			TOP VIEW
NULL (A) 1
NULL (A) 2
–IN (A)	3	–
			A
+IN (A)	4	+		+
			B
V– (B) 5
				–
OUT (B) 6
V+ (B) 7

14 V+ (A)

13 OUT (A)

12 V– (A)

11 +IN (B)

10 –IN (B)

9 NULL (B)

8 NULL (B)

J PACKAGE	N PACKAGE
14 PIN HERMETIC	14 PIN PLASTIC

NOTE: Device may be operated even if insertion is reversed; this is due to inherent symmetry of pin locations of amplifiers A and B. (Note 6)

OFFSET ORDER VOLTAGE PART NO. MAX

at 25°C

LT1002AMJ 60μV LT1002MJ 100μV LT1002ACJ 60μV LT1002CJ 100μV LT1002ACN 60μV LT1002CN 100μV

ELECTRICAL CHARACTERISTICS, IUDIVIDUAL AWPLIFIERS

VS = ±15V, TA = 25°C, unless otherwise noted

LT1002AM/LT1002AC

LT1002M/LT1002C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VOS

Input Offset Voltage

Note 1

20

60

25

100

mV

DVOS

Long Term Input Offset Voltage

mV/month

DTime

Stability

Notes 2 and 3

0.3

1.5

0.4

2.0

IOS

Input Offset Current

0.3

2.8

0.4

4.2

nA

IB

Input Bias Current

±0.6

±3.0

±0.7

±4.5

nA

n

Input Noise Voltage

0.1Hz to 10Hz (Note 2)

0.35

0.7

0.38

0.75

mVp-p

e

en

Input Noise Voltage Density

fO = 10Hz (Note 5)

10.3

20.0

10.5

20.0

nVÖ

fO = 1000Hz (Note 2)

9.6

11.5

9.8

12.0

Hz

AVOL

Large Signal Voltage Gain

RL ³ 2kW, VO = ±12V

400

800

350

800

V/mV

RL ³ 1kW, VO = ±10V

250

500

220

500

CMRR

Common Mode Rejection Ratio

VCM = ±13V

110

126

110

126

dB

PSRR

Power Supply Rejection Ratio

VS = ±3V to ±18V

108

123

105

123

dB

Rin

Input Resistance Differential Mode

Note 4

20

100

13

80

MW

Input Voltage Range

±13

±14

±13

±14

V

VOUT

Maximum Output Voltage Swing

RL ³ 2kW

±13

±14

±13

±14

V

RL ³ 1kW

±12

±13.5

±12

±13.5

SR

Slew Rate

RL ³ 2kW (Note 4)

0.1

0.25

0.1

0.25

V/ms

GBW

Gain Bandwidth Product

Note 4

0.4

0.8

0.4

0.8

MHz

Pd

Power Dissipation

No load

46

75

48

85

mW

per amplifier

No load, VS = ±3V

4

7

4

8

2

LT1002

ELECTRICAL CHARACTERISTICS, IUDIVIDUAL AWPLIFIERS

VS = ±15V, –55°C ≤ TA ≤ 125°C, unless otherwise noted

						LT1002AM			LT1002M
SYMBOL		PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS		Input Offset Voltage	Note 1	●		30	150		45	230	mV
DVOS		Average Input Offset Voltage Drift		●		0.2	0.9		0.3	1.3	mV/°C
DTemp
IOS		Input Offset Current		●		0.8	5.6		1.2	8.5	nA
IB		Input Bias Current		●		±1.0	±6.0		±1.5	±9.0	nA
AVOL		Large Signal Voltage Gain	RL ³ 2kW, VO = ±10V	●	300	700		200	700		V/mV
CMRR		Common Mode Rejection Ratio	VCM = ±13V	●	106	122		104	120		dB
PSRR		Power Supply Rejection Ratio	VS = ±3V to ±18V	●	102	117		96	117		dB
		Input Voltage Range		●	±13	±14		±13	±14		V
VOUT		Output Voltage Swing	RL ³ 2kW	●	±12.5	±13.5		±12.0	±13.5		V
Pd		Power Dissipation	No load	●		55	90		60	100	mW
		per amplifier

VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted

					LT1002AC				LT1002C
SYMBOL		PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS		Input Offset Voltage	Note 1	●		20	100		30	160	mV
DVOS		Average Input Offset Voltage Drift		●		0.2	0.9		0.3	1.3	mV/°C
DTemp
IOS		Input Offset Current		●		0.5	4.2		0.6	5.7	nA
IB		Input Bias Current		●		±0.7	±4.5		±1.0	±6.0	nA
AVOL		Large Signal Voltage Gain	RL ³ 2kW, VO = ±10V	●	350	750		250	750		V/mV
CMRR		Common Mode Rejection Ratio	VCM = ±13V	●	108	124		106	123		dB
PSRR		Power Supply Rejection Ratio	VS = ±3V to ±18V	●	105	120		100	120		dB
		Input Voltage Range		●	±13	±14		±13	±14		V
VOUT		Output Voltage Swing	RL ³ 2kW	●	±12.5	±13.8		±12.5	±13.8		V
Pd		Power Dissipation	No Load	●		50	85		55	90	mW
		per amplifier

The ● denotes the specifications which apply over the full operating temperature range.

For MIL-STD components, please refer to LTC 883C data sheet for test listing and parameters.

Note 1: Offset voltage measured with high speed test equipment, approximately 1second after power is applied.

Note 2: This parameter is tested on a sample basis only.

Note 3: Long Term Input Offset Voltage Stability refers to the averaged trend line of VOS versus Time over extended periods after the first 30 days of operation. Excluding the initial hour of operation, changes in VOS during the first 30 operating days are typically 2.5mV.

Note 4: Parameter is guaranteed by design.

Note 5: 10Hz noise voltage density is sample tested on every lot. Devices 100% tested at 10Hz are available on request.

Note 6: The V+ supply terminals are completely independent and may be powered by separate supplies if desired (this approach, however, would sacrifice the advantages of the power supply rejection ratio matching). The V – supply terminals are both connected to the common substrate and must be tied to the same voltage. Both V – pins should be used.

3

LT1002

WATCHIUG CHARACTERISTICS at VS = ±15V, TA = 25°C, unless otherwise noted

			LT1002AM/AC				LT1002M/C
SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
	Input Offset Voltage Match		–	15	40	–	25	80	μV
IB+	Average Non-Inverting Bias			±0.6	±3.5		±0.7	±4.8
	Current		–			–			nA
IOS+	Non-Inverting Offset Current		–	0.6	3.5	–	0.7	6.0	nA
IOS–	Inverting Offset Current		–	0.6	3.5	–	0.7	6.0	nA
CMRR	Common Mode Rejection Ratio	VCM = ±13V
	Match		110	132	–	108	132	–	dB
PSRR	Power Supply Rejection Ratio	VS = ±3V to ±18V
	Match		108	130	–	102	128	–	dB
	Channel Seperation	f ≤ 10Hz (Note 4)	132	148	–	130	146	–	dB

WATCHIUG CHARACTERISTICS at VS = ±15V, – 55°C ≤ TA ≤ 125°C, unless otherwise noted

					LT1002AM			LT1002M
SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
	Input Offset Voltage Match		●	–	50	140	–	60	230	μV
	Input Offset Voltage Tracking		●	–	0.3	1.0	–	0.4	1.5	μV/°C
IB+	Average Non-Inverting Bias				±1.5	±6.0		±1.8	±10.0
	Current		●	–			–			nA
IOS+	Non-Inverting Offset Current		●	–	1.5	6.5	–	1.8	12.0	nA
IOS–	Inverting Offset Current		●	–	1.5	6.5	–	1.8	12.0	nA
CMRR	Common Mode Rejection Ratio	VCM = ±13V
	Match		●	106	126		102	124	–	dB
PSRR	Power Supply Rejection Ratio	VS = ±3V to ±18V
	Match		●	102	122		94	120	–	dB

WATCHIUG CHARACTERISTICS at VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted

					LT1002AC			LT1002C
SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
	Input Offset Voltage Match		●	–	30	85	–	45	150	μV
	Input Offset Voltage Tracking		●	–	0.3	1.0	–	0.4	1.5	μV/°C
IB+	Average Non-Inverting Bias				±1.0	±4.5		±1.2	±7.0
	Current		●	–			–			nA
IOS+	Non-Inverting Offset Current		●	–	1.0	5.0	–	1.2	8.5	nA
IOS–	Inverting Offset Current		●	–	1.0	5.0	–	1.2	8.5	nA
CMRR	Common Mode Rejection Ratio	VCM = ±13V
	Match		●	108	130	–	105	128	–	dB
PSRR	Power Supply Rejection Ratio	VS = ±3V to ±18V
	Match		●	105	126	–	98	124	–	dB

4

LT1002

TYPICAL PERFORWAUCE CHARACTERISTICS

																																				Distribution of Offset Voltage Drift
	Distribution of Offset Voltage of																																			with Temperature
	Individual Amplifiers																																			(Individual Amplifiers)
	100																																			70
																								VS = ±15V																												VS =		±15V
	80																							TA = 25°C												60
																																						260 UNITS					TESTED
UNITS	60		574 UNITS TESTED																																UNITS	50
																																				40
OF																																			OF
NUMBER	40																																		NUMBER	30
																																				20
	20
																																				10
	0																																			0
	–100 –80 –60 –40 –20																0		20			40			60			80				100				–1.2		–0.8				–0.4		0				+0.4			+0.8				+1.2
						INPUT OFFSET VOLTAGE (μV)																																	INPUT OFFSET VOLTAGE DRIFT
																													1002 G01											WITH TEMPERATURE (μV/°C)
																																																							1002 G02

Distribution of Offset Voltage

Match Drift with Temperature

	35
																	VS =		±15V
	30
	25												130		UNITS				TESTED
UNITS
	20
OF
NUMBER	15
	10
	5

–1.2 –0.8 –0.4 0 +0.4 +0.8 +1.2 OFFSET VOLTAGE MATCH DRIFT

WITH TEMPERATURE (μV/°C)

1002 G03

Offset Voltage Drift with Temperature of Six Representative Units

(μV)	100
	80
VOLTAGE
	60					LT1002M
	40
		LT1002AM
OFFSET							LT1002AM
	20
	0
AMPLIFIER				LT1002AM
	–20
						LT1002M
	–40	LT1002M
INDIVIDUAL	–60
	–80
	–100				50			125
				25
	–50	–25	0			75	100

TEMPERATURE (°C)

1002 G04

Offset Voltage Tracking with Temperature
of Six Representative Units	Warm-Up Drift

V)(MATCHVOLTAGEOFFSETμ	100					VS = ±15V			(MICROVOLTS)VOLTAGEOFFSETINCHANGE	5				VS =	±15V
	80
														TA = 25°C
					LT1002M
	60	LT1002AM								4
												N14 PLASTIC PACKGE
	40					LT1002AM
	20									3
	0				LT1002M							J14 HERMETIC DIP PACKGE
	–20									2
						LT1002AM
	–40
	–60				LT1002M					1
	–80
	–100									0	1		3
	–50	–25	0	25	50	75	100	125		0		2		4	5
			TEMPERATURE (°C)									TIME AFTER POWER ON –
							1002 G04				BOTH AMPLIFIERS (MINUTES)				1002 G06

Long Term Stability of Four

Representative Units

		10
	(μV)	5
	CHANGE
	VOLTAGE	0
	OFFSET	–5
		–10

0 1 2 3 4 5 TIME (MONTHS)

1001 G07

0.1Hz to 10Hz Noise													Noise Spectrum
											100																																	10
														TA = 25°C
														VS = ±3 TO ±18V
100nV/DIVVOLTAGENOISE										HznV/NOISEVOLTAGE√	3																																	0.3	HzpA/NOISECURRENT√
											30					1/f CORNER																												3
																4Hz
											10																		VOLTAGE															1
																												1/f					CORNER
																												70Hz
											1																							CURRENT										0.1
0		2	4		6		8	10				1		10													100
																																						1000
			TIME (SECONDS)																		FREQUENCY (Hz)
								1001 G08																														1002 G09

5