LINEAR TECHNOLOGY LT1672, LT1673, LT1674 Technical data

FEATURES

LT1672/LT1673/LT1674

2µA Max, AV ≥ 5 Single, Dual

and Quad Over-The-Top Precision

Rail-to-Rail Input and Output Op Amps

U

DESCRIPTIO

■

Gain of 5 Stable

■

Low Supply Current: 2µA Max per Amplifier

■

Rail-to-Rail Input and Output

■

Low Offset Voltage: 375µV Max

■

Over-The-TopTM Inputs Operate Above V

■

Gain Bandwidth Product: 12kHz

■

Wide Supply Range: 2.2V to 36V

■

Single Supply Input Range: –0.3V to 36V

■

Low Input Bias Current: 250pA

■

Low Input Offset Current: 20pA

■

High A

■

Output Sources and Sinks 500µA Load Current

■

Reverse Battery Protected to 18V

: 100V/mV Minimum Driving 100kΩ Load

VOL

+

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APPLICATIO S

■

Battery- or Solar-Powered Systems

■

Portable Instrumentation

■

Remote Sensor Amplifier

■

Micropower Filter

■

Photodiode Amplifier

■

High Impedance Circuits

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

Over-The-Top is a trademark of Linear Technology Corporation.

The LT®1672/LT1673/LT1674 are ultralow power
(IS ≤ 2µA) decompensated (AV ≥ 5) op amps with preci­sion specifications. The extremely low supply current is
combined with excellent amplifier specifications: input
offset voltage is 375µV maximum with a typical drift of
only 0.4µV/°C, input offset current is 100pA maximum. A
minimum open-loop gain (A

) of 100V/mV ensures that

VOL

gain errors are small. The devices’ characteristics change
little over the supply range of 2.2V to ±15V. Supply
rejection is 90dB and the common mode rejection ratio is
90dB. Operation is specified for 3V, 5V and ±15V supplies.
Reverse battery protection (–18V min) and inputs that
operate above the positive supply make the LT1672/
LT1673/LT1674 easy to use in harsh environments.

The low bias currents and offset current of the amplifier
permit the use of megohm level source resistors without
introducing significant errors. Voltage noise at 4µV

P-P

is
remarkably low considering the low supply current. For
unity gain stable versions of these amplifiers, see the
LT1494/LT1495/LT1496.

The LT1672 is available in the 8-pin MSOP, PDIP and SO
packages. The LT1673 is available in plastic 8-pin PDIP
and SO-8 packages with the standard dual op amp pinout.
The LT1674 is available in 14-pin PDIP and SO packages.

TYPICAL APPLICATION

Single Supply, 60µW Precision Instrumentation Amplifier

5V

+

1/2 LT1673

–

1M

–

1/2 LT1673

+

100k1M

100k

1M

0.0047µF

V

V

100k*

IN1

110k

1000pF

110k

100k*

IN2

U

–

LT1672

+

1M

5V

LT1389-2.5

1672/3/4 TA01

1M

V

OUT

= 100

A

V

5V

BANDWIDTH = 1kHz
CMRR = 65dB AT 120Hz
*500V TRANSIENT PROTECTION
TOTAL SUPPLY CURRENT = 12µA

80

70

60

50

40

UNITS

30

20

10

0

–1.5

TC VOS Distribution

120 AMPLIFIERS

= ±2.5V

V

S

–40°C to 85°C

–0.9 –0.3 0.3 1.5

TC VOS (µV/°C)

0.9

1672/3/4 TA02

1

LT1672/LT1673/LT1674

TOP VIEW

S PACKAGE

14-LEAD PLASTIC SO

N PACKAGE

14-LEAD PDIP

1
2
3
4
5
6
7

14
13
12
11
10

9
8

OUT A

–IN A
+IN A

V

+

+IN B
–IN B

OUT B

OUT D
–IN D
+IN D
V

–

+IN C
–IN C
OUT C

A

B

D

C

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V+ to V–) .............................. 36V

Differential Input Voltage ......................................... 36V

Input Current ...................................................... ±10mA

Output Short-Circuit Duration.......................Continuous

Operating Temperature Range (Note 2) .. – 40°C to 85°C

UU

W

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

NC

1

–IN

2

+IN

3

–

V

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 150°C, θJA = 250°C/W

JMAX

OUT A

1

–IN A

2

+IN A

3

–

V

4

TOP VIEW

TOP VIEW

A

8

NC

+

7

V

6

OUT

5

NC

+

V

8

OUT B

7

–IN B

6

B

+IN B

5

LT1672CMS8
LT1672IMS8

MS8 PART MARKING

LTFH
LTFJ

ORDER PART

NUMBER

LT1673CN8
LT1673CS8
LT1673IN8
LT1673IS8

Specified Temperature Range (Note 3)... –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Junction Temperature...........................................150°C

Lead Temperature (Soldering, 10 sec)..................300°C

ORDER PART

TOP VIEW

NC

1

–IN

2

+IN

3

–

V

4

N8 PACKAGE
8-LEAD PDIP

T

= 150°C, θJA = 130°C/ W (N8)

JMAX

= 150°C, θJA = 190°C/ W (S8)

T

JMAX

8

NC

+

V

7

OUT

6

NC

5

S8 PACKAGE

8-LEAD PLASTIC SO

NUMBER

LT1672CN8
LT1672CS8
LT1672IN8
LT1672IS8

S8 PART MARKING

1672
1672I

ORDER PART

NUMBER

LT1674CN
LT1674CS
LT1674IN
LT1674IS

N8 PACKAGE
8-LEAD PDIP

T

= 150°C, θJA = 150°C/ W (N8)

JMAX

T

= 150°C, θJA = 190°C/ W (S8)

JMAX

S8 PACKAGE

8-LEAD PLASTIC SO

S8 PART MARKING

1673
1673I

T

= 150°C, θJA = 110°C/ W (N)

JMAX

T

= 150°C, θJA = 150°C/ W (S)

JMAX

Consult factory for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

2

Input Offset Voltage VS = 5V 150 375 µV

= 3V 200 475 µV

V

S

= 5V, MS8 Package 150 475 µV

V

S

VS = 3V, MS8 Package 200 575 µV

Input Bias Current (Note 5) 250 1000 pA

Input Offset Current (Note 5) 20 100 pA
Input Noise Voltage 0.1Hz to 10Hz 4 µV

VCM = 10V (Note 6) 180 360 nA

P-P

LT1672/LT1673/LT1674

ELECTRICAL CHARACTERISTICS

TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

e

n

i

n

A

VOL

CMRR Common Mode Rejection Ratio VCM = 0V to 4V, VS = 5V 90 106 dB

PSRR Power Supply Rejection Ratio VS = 2.2V to 12V, VCM = VO = 0.5V 90 99 dB

V

OL

V

OH

I

SC

I

S

SR Slew Rate AV = –5, VS = ±10V 1.6 5 V/ms
GBW Gain Bandwidth Product f = 100Hz 12 kHz

Input Noise Voltage Density f = 100Hz 185 nV/√Hz
Input Noise Current Density f = 100Hz 10 fA/√Hz
Large-Signal Voltage Gain VS = 5V, VO = 0.25V to 4.5V, RL = 100k 100 500 V/mV

VS = 3V, VO = 0.25V to 2.5V, RL = 100k 50 250 V/mV

Input Voltage Range 0 36 V

VCM = 0V to 10V, VS = 5V 74 95 dB

Minimum Operating Supply Voltage 2.1 2.2 V
Output Voltage Swing LOW No Load 50 100 mV

I

= 100µA 210 410 mV

SINK

Output Voltage Swing HIGH No Load V+ – 0.07 V+ – 0.035 V

I

= 100µAV

SOURCE

Short-Circuit Current (Note 5) 0.7 1.3 mA
Supply Current per Amplifier (Note 6) 1.5 2 µA
Reverse Supply Voltage IS = 10µA per Amplifier –18 V

+

– 0.32 V+ – 0.160 V

The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = 5V, 0V; VS = 3V, 0V;
VCM = VO = half supply, unless otherwise noted. (Note 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

VOS TC Input Offset Voltage Drift (Note 4) ● 0.4 2 µV/°C
I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = 0.2V to 4V, VS = 5V ● 89 106 dB

PSRR Power Supply Rejection Ratio VS = 2.4V to 12V, VCM = VO = 0.5V ● 89 99 dB

V

OL

V

OH

I

SC

I

S

Input Offset Voltage VS = 5V ● 175 425 µV

= 3V ● 225 525 µV

V

S

V

= 5V, MS8 Package ● 175 525 µV

S

VS = 3V, MS8 Package ● 225 625 µV

Input Bias Current (Note 5) ● 250 1200 pA

VCM = 10V (Note 6) ● 240 500 nA

Input Offset Current (Note 5) ● 20 120 pA
Large-Signal Voltage Gain VS = 5V, VO = 0.25V to 4.5V, RL = 100k ● 75 280 V/mV

VS = 3V, VO = 0.25V to 2.5V, RL = 100k ● 40 150 V/mV

Input Voltage Range ● 0.2 36 V

VCM = 0.2V to 10V, VS = 5V ● 64 85 dB

Minimum Operating Supply Voltage ● 2.3 2.4 V
Output Voltage Swing LOW No Load ● 55 110 mV

I

= 100µA ● 225 450 mV

SINK

Output Voltage Swing HIGH No Load ● V+ – 0.08 V+ – 0.04 V

I

= 100µA ● V+ – 0.36 V+ – 0.18 V

SOURCE

Short-Circuit Current (Note 5) ● 0.6 1.1 mA
Supply Current per Amplifier (Note 6) ● 1.9 2.8 µA

3

LT1672/LT1673/LT1674

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = 5V, 0V; VS = 3V, 0V;
VCM = VO = half supply, unless otherwise noted. (Note 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

VOS TC Input Offset Voltage Drift (Note 4) ● 0.4 2 µV/°C
I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = 0.2V to 4V, VS = 5V ● 88 106 dB

PSRR Power Supply Rejection Ratio VS = 2.7V to 12V, VCM = VO = 0.5V ● 88 99 dB

V

OL

V

OH

I

SC

I

S

Input Offset Voltage VS = 5V ● 200 475 µV

= 3V ● 250 575 µV

V

S

V

= 5V, MS8 Package ● 200 575 µV

S

VS = 3V, MS8 Package ● 250 675 µV

Input Bias Current (Note 5) ● 250 1700 pA

VCM = 10V (Note 6) ● 275 750 nA

Input Offset Current (Note 5) ● 20 170 pA
Large-Signal Voltage Gain VS = 5V, VO = 0.25V to 4.5V, RL = 100k ● 55 215 V/mV

VS = 3V, VO = 0.25V to 2.5V, RL = 100k ● 30 115 V/mV

Input Voltage Range ● 0.2 36 V

VCM = 0.2V to 10V, VS = 5V ● 62 75 dB

Minimum Operating Supply Voltage ● 2.6 2.7 V
Output Voltage Swing LOW No Load ● 60 120 mV

I

= 100µA ● 245 490 mV

SINK

Output Voltage Swing HIGH No Load ● V+ – 0.10 V+ – 0.05 mV

I

= 100µA ● V+ – 0.38 V+ – 0.19 mV

SOURCE

Short-Circuit Current (Note 5) ● 0.4 0.9 mA
Supply Current per Amplifier (Note 6) ● 2.1 3.1 µA

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

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = –15V to 14V 100 120 dB
PSRR Power Supply Rejection Ratio VS = ±5V to ±15V 96 120 dB
V

OL

V

OH

I

SC

I

S

Input Offset Voltage 200 575 µV

MS8 Package 200 675 µV

Input Bias Current 25 1000 pA
Input Offset Current 20 100 pA
Large-Signal Voltage Gain VO = ±10V, RL = 100k 100 360 V/mV
Input Voltage Range –15 21 V

Output Voltage Swing LOW RL = 1M –14.85 –14.70 V

RL = 100k –14.75 –14.50 V

Output Voltage Swing HIGH RL = 1M 14.78 14.89 V

RL = 100k 14.62 14.81 V

Short-Circuit Current 0.7 1.5 mA
Supply Current per Amplifier 1.9 2.8 µA

4