Linear Technology LT1008S8, LT1008MH, LT1008IN8, LT1008CN8, LT1008CJ8 Datasheet

FEATURES

■Guaranteed Bias Current

TA = 25°C: 100pA Max

TA = – 55°C to 125°C: 600pA Max

■Guaranteed Offset Voltage: 120 V Max

■Guaranteed Drift: 1.5 V/°C Max

■Low Noise, 0.1Hz to 10Hz: 0.5 VP-P

■Guaranteed Low Supply Current: 600 A Max

■Guaranteed CMRR: 114dB Min

■Guaranteed PSRR: 114dB Min

■Guaranteed Voltage Gain with 5mA Load Current

APPLICATIOUS

■Precision Instrumentation

■Charge Integrators

■Wide Dynamic Range Logarithmic Amplifiers

■Light Meters

■Low Frequency Active Filters

■Standard Cell Buffers

■Thermocouple Amplifiers

LT1008

Picoamp Input Current,

Microvolt Offset,

Low Noise Op Amp

DESCRIPTIOU

The LT®1008 is a universal precision operational amplifier that can be used in practically all precision applications. The LT1008 combines for the first time, picoampere bias currents (which are maintained over the full – 55°C to 125°C temperature range), microvolt offset voltage (and low drift with time and temperature), low voltage and current noise, and low power dissipation. Extremely high common mode and power supply rejection ratios, and the ability to deliver 5mA load current with high voltage gain round out the LT1008’s superb precision specifications.

The all around excellence of the LT1008 eliminates the necessity of the time consuming error analysis procedure of precision system design in many applications; the LT1008 can be stocked as the universal precision op amp.

The LT1008 is externally compensated with a single capacitor for additional flexibility in shaping the frequency response of the amplifier. It plugs into and upgrades all standard LM108A/LM308A applications. For an internally compensated version with even lower offset voltage but otherwise similar performance see the LT1012.

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

TYPICAL APPLICATIOU

Input Amplifier for 4.5 Digit Voltmeter Input Bias Current vs Temperature

100

1000pF

1

15V

(pA)

50

2

0.1V

–

8

INPUT

CURRENT

7

1V

0.1V

100k

6

0

LT1008

1V

5%

3

+

9k*

10V

4

BIAS

9M

100V

–50

–15V

1000V

INPUT

10V

1k*

TO 1V FULL-SCALE

ANALOG-TO-DIGITAL

–100

900k

CONVERTER

100V

*RATIO MATCH ±0.01%

90k

–150

–25

1000V

–50

THIS APPLICATION REQUIRES LOW

FN507

10k

BIAS CURRENT AND OFFSET VOLTAGE,

ALLEN BRADLEY

LOW NOISE AND LOW DRIFT WITH

DECADE VOLTAGE DIVIDER

TIME AND TEMPERATURE

1008 TA01

UNDERCANCELLED UNIT

OVERCANCELLED UNIT

0

25

50

75

100

125

TEMPERATURE (°C)

1008 TA02

1

LT1008

ABSOLUTE

WAXIWUW

RATIUGS (Note 1)

Supply Voltage ......................................................	±20V	Operating Temperature Range
.....................Differential Input Current (Note 2)	±10mA		LT1008M (OBSOLETE) ...............	– 55°C to 125°C
Input Voltage ........................................................	±20V		LT1008C .................................................	0°C to 70°C
Output Short-Circuit Duration .........................	Indefinite		LT1008I .............................................	– 40°C to 85°C
Storage Temperature Range .................	– 65°C to 150°C	Lead Temperature (Soldering, 10 sec)..................		300°C

PACKAGE/ORDER IUFORWATIOU

TOP VIEW

TOP VIEW

COMP2

COMP1

1

8

COMP2

TOP VIEW

8

V+

7

+

COMP1

1

8

COMP2

COMP1

1

–IN

2

7

V

V+

–IN 2

–

6

OUT

+IN

3

6

OUT

–IN

2

7

+

V–

+IN

3

6

OUT

+IN

3

5

NC

4

5

NC

V–

4

5

NC

4

N8 PACKAGE

V– (CASE)

8-LEAD PDIP

S8 PACKAGE

H PACKAGE

TJMAX = 150°C, θJA = 130°C/W

8-LEAD PLASTIC SO

8-LEAD TO-5 METAL CAN

TJMAX = 150°C, θJA = 190°C/W

TJMAX = 150°C, θJA = 150°C/W, θJC

= 45°C/W

J8 PACKAGE 8-LEAD CERDIP

TJMAX = 150°C, θJA = 100°C/W

ORDER PART	ORDER PART	ORDER PART	ORDER PART	S8 PART
NUMBER	NUMBER	NUMBER	NUMBER	MARKING
LT1008MH	LT1008MJ8	LT1008CN8	LT1008S8	1008
LT1008CH	LT1008CJ8	LT1008IN8

OBSOLETE PACKAGES

Consider N8 or S8 Package for Alternate Source

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.

			LT1008M/I				LT1008C
SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
VOS	Input Offset Voltage			30	120		30	120	V
		(Note 3)		40	180		40	180	V
	Long-Term Input Offset Voltage Stability			0.3			0.3		V/Month
IOS	Input Offset Current			30	100		30	100	pA
		(Note 4)		40	150		40	150	pA
IB	Input Bias Current			±30	±100		±30	±100	pA
		(Note 5)		±40	±150		±40	±150	pA
en	Input Noise Voltage	0.1Hz to 10Hz		0.5			0.5		VP-P
	Input Noise Voltage Density	fO = 10Hz (Note 4)		17	30		17	30	nV√
										Hz
		fO = 1000Hz (Note 5)		14	22		14	22	nV/√Hz
in	Input Noise Current Density	fO = 10Hz		20			20		fA/√
										Hz
AVOL	Large-Signal Voltage Gain	VOUT = ±12V, RL ≥ 10k	200	2000		200	2000		V/mV
		VOUT = ±10V, RL ≥ 2k	120	600		120	600		V/mV

2

LT1008

ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.

			LT1008M/I			LT1008C
SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
CMRR	Common Mode Rejection Ratio	VCM = ±13.5V	114	132		114	132		dB
PSRR	Power Supply Rejection Ratio	VS = ±2V to ±20V	114	132		114	132		dB
	Input Voltage Range		±13.5	±14		±13.5	±14		V
VOUT	Output Voltage Swing	RL = 10k	±13	±14		±13	±14		V
	Slew Rate	CF = 30pF	0.1	0.2		0.1	0.2		V/ s
IS	Supply Current	(Note 3)		380	600		380	600	A

The ● indicates specifications which apply over the full operating temperature range of – 55°C ≤ TA ≤ 125°C for the LT1008M,

–40°C

≤ TA ≤ 85°C for the LT1008I and 0°C ≤ TA ≤ 70°C for the LT1008C. VS = ±15V, VCM = 0V, unless otherwise noted.

LT1008M/I

LT1008C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VOS

Input Offset Voltage

●

50

250

40

180

V

(Note 3)

●

60

320

50

250

V

Average Temperature Coefficient of

V/°C

Input Offset Voltage

●

0.2

1.5

0.2

1.5

IOS

Input Offset Current

●

60

250

40

180

pA

(Note 3)

●

80

350

50

250

pA

Average Temperature Coefficient of

0.4

2.5

0.4

2.5

pA/°C

Input Offset Current

●

IB

Input Bias Current

●

±80

±600

±40

±180

pA

(Note 3)

●

±150

±800

±50

±250

pA

Average Temperature Coefficient of

pA/°C

Input Bias Current

●

0.6

6

0.4

2.5

AVOL

Large-Signal Voltage Gain

VOUT = ±12V, RL ≥ 10k

●

100

1000

150

1500

V/mV

CMRR

Common Mode Rejection Ratio

VCM = ±13.5V

●

108

128

110

130

dB

PSRR

Power Supply Rejection Ratio

VS = ±2.5V to ±20V

●

108

126

110

128

dB

Input Voltage Range

●

±13.5

±13.5

V

VOUT

Output Voltage Swing

RL = 10k

●

±13

±14

±13

±14

V

IS

Supply Current

●

400

800

400

800

A

(LT1008S8 only) VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOS

Input Offset Voltage

30

200

V

(Note 3)

40

250

V

Long-Term Input Offset Voltage Stability

0.3

V/Month

IOS

Input Offset Current

100

280

pA

(Note 3)

120

380

pA

IB

Input Bias Current

±100

±300

pA

(Note 3)

±120

±400

pA

en

Input Noise Voltage

0.1Hz to 10Hz

0.5

VP-P

Input Noise Voltage Density

fO = 10Hz (Note 5)

17

30

nV/√

Hz

fO = 1000Hz (Note 5)

14

22

nV/√

Hz

3

LT1008

ELECTRICAL CHARACTERISTICS (LT1008S8 only) VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.

SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	UNITS
in	Input Noise Current Density	fO = 10Hz		20		fA/√
							Hz
AVOL	Large-Signal Voltage Gain	VOUT = ±12V, RL ≥ 10k	200	2000		V/mV
		VOUT = ±10V, RL ≥ 2k	120	600		V/mV
CMRR	Common Mode Rejection Ratio	VCM = ±13.5V	110	132			dB
PSRR	Power Supply Rejection Ratio	VS = ±2V to ±20V	110	132			dB
	Input Voltage Range		±13.5	±14			V
VOUT	Output Voltage Swing	RL = 10k	±13	±14			V
	Slew Rate	CF = 30pF	0.1	0.2		V/ s
IS	Supply Current	(Note 3)		380	600		A

(LT1008S8 only) The ● indicates specifications which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C. VS = ±15V, VCM = 0V, unless otherwise noted.

SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	UNITS
VOS	Input Offset Voltage		●		40	280	V
		(Note 3)	●		50	340	V
	Average Temperature Coefficient of		●		0.2	1.8	V/°C
	Input Offset Voltage
IOS	Input Offset Current		●		120	380	pA
		(Note 3)	●		140	500	pA
	Average Temperature Coefficient of		●		0.4	4	pA/°C
	Input Offset Current
IB	Input Bias Current		●		±120	±420	pA
		(Note 3)	●		±140	±550	pA
	Average Temperature Coefficient of		●		0.4	5	pA/°C
	Input Bias Current
AVOL	Large-Signal Voltage Gain	VOUT = ±12V, RL ≥ 10k	●	150	1500		V/mV
CMRR	Common Mode Rejection Ratio	VCM = ±13.5V	●	108	130		dB
PSRR	Power Supply Rejection Ratio	VS = ±2.5V to ±20V	●	108	128		dB
	Input Voltage Range		●	±13.5			V
VOUT	Output Voltage Swing	RL = 10k	●	±13	±14		V
IS	Supply Current		●		400	800	A

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

Note 2: Differential input voltages greater than 1V will cause excessive current to flow through the input protection diodes unless current limiting resistors are used.

Note 3: These specifications apply for ±2V ≤ VS ≤ ±20V (±2.5V ≤ VS ≤ ±20V over the temperature range) and

–13.5V ≤ VCM ≤ 13.5V (for VS = ±15V).

Note 4: 10Hz noise voltage density is sample tested on every lot. Devices 100% tested at 10Hz are available on request.

Note 5: This parameter is tested on a sample basis only.

4

									LT1008
FREQUEUCY COWPEUSATIOU CIRCUITS
	Standard Compensation Circuit					Alternate* Frequency Compensation
R1		R2				R1		R2
–VIN					–VIN				*IMPROVES REJECTION OF POWER
				**BANDWIDTH AND SLEW RATE					SUPPLY NOISE BY A FACTOR OF 5
									**BANDWIDTH AND SLEW RATE ARE
	2	–		ARE PROPORTIONAL TO 1/CF		2	–
			6					6	PROPORTIONAL TO 1/CS
		LT1008		VOUT					VOUT
R3	3		8			3		LT1008
		+					+
+VIN			CF ≥	R1CO	+VIN			8
		1		R1 + R2				CS**
			CO = 30pF					100pF
		CF**		1008 FCC01					1008 FCC02
				FOR	R2 > 200, NO EXTERNAL FREQUENCY COMPENSATION IS NECESSARY
					R1

TYPICAL PERFORWAUCE CHARACTERISTICS

OFFSET VOLTAGE DRIFT WITH TEMPERATURE ( V/°C)

Offset Voltage Drift vs Source

Offset Voltage vs Source

Resistance (Balanced or

Resistance (Balanced or

Input Bias Current vs

Unbalanced)

Unbalanced)

Common Mode Range

100

10

60

VS = ±15V

VS = ±15V

TA = 25°C

TA = 25°C

OFFSETINPUTVOLTAGE (mV)

40

DEVICE WITH POSITIVE INPUT CURRENT

BIASINPUTCURRENT (pA)

10

1

TYPICAL

VCM

+

20

RINCM = 2 × 1012Ω

MAXIMUM

0

DEVICE WITH NEGATIVE INPUT CURRENT

MAXIMUM

1

0.1

–20

–

IB

TYPICAL

–40

0.1

10k

100k

1M

10M

100M

0.01

10k

100k

1M

10M

100M

–60

–10

– 5

0

5

10

15

1k

1k

–15

SOURCE RESISTANCE (Ω)

SOURCE RESISTANCE (Ω)

COMMON MODE INPUT VOLTAGE (V)

1008 G01

1008 G02

1008 G03

CHANGE IN OFFSET VOLTAGE ( V)

Warm-Up Drift

5

VS = ±15V

TA = 25°C

4

3
2
				METAL CAN (H) PACKAGE
				DUAL-IN-LINE PACKAGE
1			PLASTIC (N) OR CERDIP (J)
0
		1	2			3		4			5
0

TIME AFTER POWER ON (MINUTES)

1008 G04

CHANGE IN OFFSET VOLTAGE ( V)

											Offset Voltage Drift with
Long-Term Stability of Four											Temperature of Four
Representative Units											Representative Units
10											60
8											40
6										V)(
4											20
										VOLTAGE
2
0										OFFSET	0
–2											–20
–4
–6											–40
–8
											–60
–10
		1	2	3		4		5					–25		0	25		50		75		100		125
0											–50
			TIME (MONTHS)													TEMPERATURE (°C)
								1008 G05															1008 G06

5