LINEAR TECHNOLOGY LT1494, LT1495, LT1496 Technical data

查询LT1494供应商

FEATURES

LT1494/LT1495/LT1496

1.5µA Max, Single, Dual

and Quad Over-The-Top Precision

Rail-to-Rail Input and Output Op Amps

U

DESCRIPTIO

■

Low Supply Current: 1.5µA Max

■

Rail-to-Rail Input and Output

■

Low Offset Voltage: 375µV Max

■

Operating Temperature Range: –40°C to 125°C

■

Over-The-Top

■

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

VOL

TM

Inputs Operate Above V

+

: 100V/mV Minimum Driving 100kΩ Load

U

APPLICATIO S

■

Battery- or Solar-Powered Systems

■

Portable Instrumentation

■

Remote Sensor Amplifier

■

Micropower Filter

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

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

The LT®1494/LT1495/LT1496 are the lowest power
(IS ≤ 1.5µA) 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 gain errors are small. The

VOL

device 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 LT1494/LT1495/LT1496 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.
The LT1494 is available in the 8-Pin MSOP, PDIP and SO

packages.The LT1495 is available in plastic 8-Pin PDIP
and SO packages with the standard dual op amp pinout.
The LT1496 is available in 14-Pin SO and PDIP packages.

TYPICAL APPLICATION

Micropower Integrating Current Sense

RESET

0.1µF

V

CC

R

I

1M

R

S

0.1Ω

1M

I

L

LOAD

V

CC

OUTPUT SWITCHES
WHEN I

= 3µA DURING INTEGRATION; IS = 5µA END OF INTEGRATION

I

S

–

1/2 LT1495

+

dt = 0.98 VCC

L

200k

R

I

C = (4.9A)(SEC) FOR V

()

R

S

10M10M

U

–

1/2 LT1495

+

TC VOS Distribution

30

100 AMPLIFIERS

= ±2.5V

V

S

25

–40°C TO 85°C

20

15

V

O

1495 TA01

= 5V

CC

UNITS

10

5

0

–1.2 –0.4 0.4 1.2

TC VOS (µV/°C)

2.0–1.6–2.0 –0.8 0 0.8 1.6

1495 TA02

1

LT1494/LT1495/LT1496

1
2
3
4
5
6
7

TOP VIEW

N PACKAGE

14-LEAD PDIP

S PACKAGE

14-LEAD PLASTIC SO

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

D

B

C

TOP VIEW

NC
V

+

OUT
NC

NC
–IN
+IN

V

–

1

2

3

4

8

7

6

5

N8 PACKAGE
8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

1
2
3
4

8
7
6
5

TOP VIEW

MS8 PACKAGE

8-LEAD PLASTIC MSOP

NC
V

+

OUT
NC

NC
–IN
+IN

V

–

WW

W

ABSOLUTE MAXIMUM RATINGS

U

(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)

LT1494C/LT1495C/LT1496C .............. –40°C to 85°C

LT1494I/LT1495I/LT1496I ................. –40°C to 85°C

LT1494H/LT1495H/LT1496H ........... –40°C to 125°C

U

W

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

LT1494CMS8
LT1494IMS8

T

= 150°C, θJA = 250°C/W

JMAX

MS8 PART MARKING

LTFF
LTFG

Specified Temperature Range (Note 3)

LT1494C/LT1495C/LT1496C .............. –40°C to 85°C

LT1494I/LT1495I/LT1496I ................. –40°C to 85°C

LT1494H/LT1495H/LT1496H ........... –40°C to 125°C

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

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

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

U

ORDER PART

NUMBER

LT1494CN8
LT1494CS8
LT1494IN8
LT1494IS8
LT1494HS8

T

= 150°C, θJA = 130°C/ W (N8)

JMAX

T

= 150°C, θJA = 190°C/ W (S8)

JMAX

S8 PART MARKING

1494
1494I
1494H

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

2

TOP VIEW

OUT A

1

–IN A

2

+IN A

N8 PACKAGE
8-LEAD PDIP

A

3

–

V

4

T

= 150°C, θJA = 130°C/ W (N8)

JMAX

= 150°C, θJA = 190°C/W (S8)

T

JMAX

+

V

8

OUT B

7

–IN B

6

B

+IN B

5

S8 PACKAGE

8-LEAD PLASTIC SO

ORDER PART

NUMBER

LT1495CN8
LT1495CS8
LT1495IN8
LT1495IS8
LT1495HS8

S8 PART MARKING

1495
1495I
1495H

T

= 150°C, θJA = 130°C/ W (N)

JMAX

T

= 150°C, θJA = 160°C/ W (S)

JMAX

ORDER PART

NUMBER

LT1496CN
LT1496CS
LT1496IN
LT1496IS
LT1496HS

LT1494/LT1495/LT1496

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

e

n

i

n

A

VOL

CMRR Common Mode Rejection Ratio V

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 = –1, VS = ±5V 0.4 1.0 V/ms
GBW Gain Bandwidth Product f = 100Hz 2.7 kHz

Input Offset Voltage VS = 5V 150 375 µV

V

= 3V 200 475 µV

S

= 5V, MS8 Package 150 475 µV

V

S

VS = 3V, MS8 Package 200 575 µV

Input Bias Current (Note 5) 250 1000 pA

VCM = 10V (Note 6) 180 360 nA

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

= 0V to 4V, VS = 5V 90 106 dB

CM

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) 1.0 1.5 µA
Reverse Supply Voltage IS = 10µA per Amplifier –18 V

+

– 0.32 V+ – 0.160 V

P-P

3

LT1494/LT1495/LT1496

ELECTRICAL CHARACTERISTICS

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 V

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

= 5V, MS8 Package ● 175 525 µV

V

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

= 0.2V to 4V, VS = 5V ● 89 106 dB

CM

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) ● 1.2 1.8 µA

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 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 ● 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) ● 1.5 2.3 µA

4

LT1494/LT1495/LT1496

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VO =
half supply, unless otherwise noted. (Note 3)

LT1494H/LT1495H/LT1496H

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

VOS TC Input Offset Voltage Drift (Note 4) ● 0.4 3 µV/°C
I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = 0.5V to 4V, VS = 5V ● 72 95 dB

PSRR Power Supply Rejection Ratio VS = 2.7V to 12V, VCM = VO = 0.5V ● 86 105 dB

V

OL

V

OH

I

S

Input Offset Voltage VS = 5V ● 225 875 µV

VS = 3V ● 275 975 µV

Input Bias Current (Note 5) ● 3.8 10 nA

VCM = 10V (Note 6) ● 0.300 2 µA

Input Offset Current (Note 5) ● 0.3 2 nA
Large-Signal Voltage Gain VS = 5V, VO = 0.25V to 4.5V, RL = 100k ● 425 V/mV

VS = 3V, VO = 0.25V to 2.5V, RL = 100k ● 217 V/mV

Input Voltage Range ● 0.5 36 V

VCM = 0.5V to 10V, VS = 5V ● 85 dB

Minimum Operating Supply Voltage ● 2.7 V
Output Voltage Swing LOW No Load ● 70 160 mV

I

= 100µA ● 275 550 mV

SINK

Output Voltage Swing HIGH No Load ● V+ – 140 V+ – 45 mV

I

= 100µA ● V+ – 450 V+ – 225 mV

SOURCE

Supply Current per Amplifier (Note 6) ● 25µA

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 1.4 2.0 µA

5

LT1494/LT1495/LT1496

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C, VS = ±15V, VCM = VO = 0V, unless
otherwise noted. (Note 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = –14.8V to 14V ● 98 120 dB
PSRR Power Supply Rejection Ratio VS = ±5V to ±15V ● 94 120 dB
V

OL

V

OH

I

SC

I

S

The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C, VS = ±15V, VCM = VO = 0V, unless
otherwise noted. (Note 3)

Input Offset Voltage ● 225 625 µV

MS8 Package ● 225 725 µV

Input Bias Current ● 250 1200 pA
Input Offset Current ● 20 120 pA
Large-Signal Voltage Gain VO = ±10V, RL = 100k ● 60 240 V/mV
Input Voltage Range ● –14.8 21 V

Output Voltage Swing LOW RL = 1M ● –14.84 –14.67 V

RL = 100k ● –14.73 –14.46 V

Output Voltage Swing HIGH RL = 1M ● 14.76 14.88 V

RL = 100k ● 14.58 14.79 V

Short-Circuit Current ● 0.6 1.3 mA
Supply Current per Amplifier ● 1.6 2.4 µA

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = –14.8V to 14V ● 96 114 dB
PSRR Power Supply Rejection Ratio VS = ±5V to ±15V ● 92 120 dB
V

OL

V

OH

I

SC

I

S

Input Offset Voltage ● 250 675 µV

MS8 Package ● 250 775 µV

Input Bias Current ● 250 1700 pA
Input Offset Current ● 20 170 pA
Large-Signal Voltage Gain VO = ±10V, RL = 100k ● 50 200 V/mV
Input Voltage Range ● –14.8 21 V

Output Voltage Swing LOW RL = 1M ● –14.83 –14.66 V

RL = 100k ● –14.72 –14.44 V

Output Voltage Swing HIGH RL = 1M ● 14.74 14.87 V

RL = 100k ● 14.54 14.77 V

Short-Circuit Current ● 0.4 1.1 mA
Supply Current per Amplifier ● 2.0 3.0 µA

6

LT1494/LT1495/LT1496

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 125°C. VS = ±15V, VCM = VO = half supply,
unless otherwise noted. (Note 3)

LT1494H/LT1495H/LT1496H

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

B

I

OS

A

VOL

CMRR Common Mode Rejection Ratio VCM = –14.5V to 14V ● 69 90 dB
PSRR Power Supply Rejection Ratio VS = ±5V to ±15V ● 89 115 dB
V

OL

V

OH

I

S

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

Note 2: The LT1494C/LT1495C/LT1496C and LT1494I/LT1495I/LT1496I
are guaranteed functional over the operating temperature range of –40°C
to 85°C. The LT1494H/LT1495H/LT1496H are guaranteed functional over
the operating temperature range of –40°C to 125°C.

Note 3: The LT1494C/LT1495C/LT1496C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1494C/LT1495C/LT1496C are
designed, characterized and expected to meet specified performance from

Input Offset Voltage ● 275 1100 µV
Input Bias Current ● 3.8 10 nA
Input Offset Current ● 0.3 2 nA
Large-Signal Voltage Gain VO = ±10V, RL = 100k ● 21 70 V/mV
Input Voltage Range ● –14.5 21 V

Output Voltage Swing LOW RL = 1M ● –14.80 –14.4 V

RL = 100k ● –14.69 –14.2 V

Output Voltage Swing HIGH RL = 1M ● 14.5 14.85 V

RL = 100k ● 14.3 14.73 V

Supply Current per Amplifier ● 36µA

–40°C to 85°C but are not tested or QA sampled at these temperatures.
The LT1494I/LT1495I/LT1496I are guaranteed to meet specified
performance from –40°C to 85°C. The LT1494H/LT1495H/LT1496H are
guaranteed to meet specified performance from –40°C to 125°C.

Note 4: This parameter is not 100% tested.
Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and

= ±15V tests.

V

S

Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and

= ±15V tests.

V

S

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Distribution of Input Offset Voltage

20
18
16
14
12
10

8
6

PERCENT OF UNITS (%)

4
2
0

–400

–300 –100

–200

INPUT OFFSET VOLTAGE (µV)

VS = 5V, 0V
LT1494/LT1495/

5700 OP AMPS

0

100

LT1496

200

300

400

1495 G01

Supply Current vs Temperature Minimum Supply Voltage

2.5

2.0

1.5

1.0

0.5

SUPPLY CURRENT PER AMPLIFIER (µA)

0

–40 –20

VS = ±15V

V

S

0

TEMPERATURE (°C)

= ±2.5V

20

40

60

80

1495 G02

100

200

150

100

TA = 85°C

50

0

CHANGE IN OFFSET VOLTAGE (µV)

–50

1

TA = 25°C

T

= –40°C

A

2

TOTAL SUPPLY VOLTAGE (V)

3

4

5

1495 G03

7

LT1494/LT1495/LT1496

COMMON MODE VOLTAGE (V)

0

INPUT BIAS CURRENT (nA)

100

200

300

8

1495 G06

1.5

0.5

–0.5

2

4

6

1–1 9

3

5

7

10

VS = 5V, 0V

TA = 85°C

TA = 85°C

TA = 25°C

TA = –40°C

TA = –40°C

TA = 25°C

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Output Saturation Voltage
vs Load Current (Output Low)

1000

VS = 5V, 0V

= 85°C

T

A

100

TA = –40°C

SATURATION VOLTAGE (mV)

10

0.1

101 1000100

LOAD CURRENT (µA)

Gain and Phase Shift
vs Frequency

50

VS = ±2.5V

40

30

20

10

0

VOLTAGE GAIN (dB)

–10

–20

GAIN

TA = 25°C

PHASE

1495 G04

Output Saturation Voltage
vs Load Current (Output High)

1000

100

SATURATION VOLTAGE (mV)

10

0.1

120

100

80

60

40

20

0

–20

300

250

PHASE SHIFT (DEG)

200

150

100

NOISE VOLTAGE (nV/√Hz)

50

VS = 5V, 0V

T

= 85°C

A

TA = –40°C

LOAD CURRENT (µA)

TA = 25°C

101 1000100

Noise Voltage Spectrum

VS = ±2.5V

1495 G05

Input Bias Current
vs Common Mode Voltage

Noise Current Spectrum

100

VS = ±2.5V

80

60

40

CURRENT NOISE (fA/√Hz)

20

–30

0.1

Gain Bandwidth and Phase
Margin vs Supply Voltage

3.5

3.0

2.5

2.0

1.5

FREQUENCY (kHz)

1.0

0.5

0

0

8

FREQUENCY (kHz)

510

SUPPLY VOLTAGE (V)

110

–40

1495 G10

0

0.1Hz to 10Hz
Output Voltage Noise

PHASE MARGIN

GBW

20 30

15 25

1495 G11

70

60

PHASE MARGIN (DEG)

50

40

30

20

10

0

VS = ±15V
V

OUTPUT VOLTAGE (2µV/DIV)

CM

1

10 100

FREQUENCY (Hz)

1495 G08

0

1

10 100

FREQUENCY (Hz)

1495 G09

Capacitive Load Handling

80

= 0V

TIME (1s/DIV)

1495 G07

VS = ±2.5V

70

60

50

40

30

OVERSHOOT (%)

20

10

0

10 1000 10000 100000

100

= 1

A

V

= 5

A

V

CAPACITIVE LOAD (pF)

A

V

= 10

1495 G12

W

FREQUENCY (kHz)

1

OUTPUT IMPEDANCE (kΩ)

10

100

1000

0.01 1 10

1495 G15

0.1

0.1

AV = 10

AV = 1

U

TYPICAL PERFORMANCE CHARACTERISTICS

LT1494/LT1495/LT1496

Common Mode Rejection Ratio
vs Frequency

100

90
80
70
60

50
40
30
20
10

COMMON MODE REJECTION RATIO (dB)

0

0.01

0.1 1 10
FREQUENCY (kHz)

Warm-Up Drift vs Time

40

30

OFFSET VOLTAGE CHANGE (µV)

20

10

–10

–20

–30

– 40

VS = ±15V

0

0

= ±2.5V

V

S

40 80 120 20014020 60 100 180
TIME AFTER POWER-UP (SEC)

VS = ±2.5V

1495 G13

160

1495 G16

Power Supply Rejection Ratio
vs Frequency

100

90
80
70
60

50
40
30
20
10

POWER SUPPLY REJECTION RATIO (dB)

0

0.01

POSITIVE
SUPPLY

NEGATIVE

SUPPLY

0.1 1 10
FREQUENCY (kHz)

Open-Loop Gain
VS = 5V, 0V

20

15

10

5

0

= 100k

R

L

–5

–10

OFFSET VOLTAGE CHANGE (µV)

–15

–20

0

= 1M

R

L

12 4

3

OUTPUT VOLTAGE (V)

VS = ±2.5V

1495 G14

VS = 5V, 0V

5

1495 G17

Output Impedance vs Frequency

Open-Loop Gain
VS = ±15V

80

60

40

20

0

–20

–40

OFFSET VOLTAGE CHANGE (µV)

–60

–80

6

–20 –15

RL = 100k

RL = 1M

–10 –5 0 5 1510

OUTPUT VOLTAGE (V)

VS = ±15V

20

1495 G18

Small-Signal Response
VS = ±15V

VS = ±15V
R

= 1M

L

= 100pF

C

L

1495 G19

Small-Signal Response
VS = 5V, 0V

VS = 5V, 0V
R

= 1M

L

= 100pF

C

L

1495 G20

Large-Signal Response
VS = 5V, 0V

VS = 5V, 0V

= 1M

R

L

= 100pF

C

L

1495 G21

9

LT1494/LT1495/LT1496

U

WUU

APPLICATIONS INFORMATION

Start-Up Characteristics

Micropower op amps are sometimes not micropower
during start-up, wreaking havoc on low current supplies.
In the worst case, there may not be enough supply current
available to take the system up to nominal voltages. Figure
1 is a graph of LT1495 supply current vs supply voltage
for the three limit cases of input offset that could occur
during start-up. The circuits are shown in Figure 2. One
circuit creates a positive offset, forcing the output to come
up saturated high. Another circuit creates a negative
offset, forcing the output to come up saturated low, while
the last brings up the output at half supply. In all cases, the
supply current is well behaved. Supply current is highest
with the output forced high, so if one amplifier is unused,
it is best to force the output low or at half supply.

5

4

V

S

OUTPUT HIGH

OUTPUT LOW

OUTPUT VS/2

1495 F01

5

V

S

3

2

1

SUPPLY CURRENT PER AMPLIFIER (µA)

0

01234

Figure 1. Start-Up Characteristics

V

S

SUPPLY VOLTAGE (V)

Reverse Battery

The LT1494/LT1495/LT1496 are protected against reverse
battery voltages up to 18V. In the event a reverse battery
condition occurs, the supply current is typically less than
100nA (inputs grounded and outputs open). For typical
single supply applications with ground referred loads and
feedback networks, no other precautions are required. If
the reverse battery condition results in a negative voltage
at either the input pins or output pin, the current into the
pin should be limited by an external resistor to less than
10mA.

Inputs

While the LT1494/LT1495/LT1496 will function normally
with its inputs taken above the positive supply, the com­mon mode range does not extend beyond approximately
300mV below the negative supply at room temperature.
The device will not be damaged if the inputs are taken lower
than 300mV below the negative supply as long as the cur­rent out of the pin is limited to less than 10mA. However,
the output phase is not guaranteed and the supply current
will increase.

Output

The graph, Capacitive Load Handling, shows amplifier sta­bility with the output biased at half supply. If the output is
to be operated within about 100mV of the positive rail, the
allowable load capacitance is less. With this output volt­age, the worst case occurs at AV = 1 and light loads, where
the load capacitance should be less than 500pF with a 5V
supply and less than 100pF with a 30V supply.

+

–

OUTPUT HIGH

10

VS/2

+

–

OUTPUT LOW

Figure 2. Circuits for Start-Up Characteristics

+

–

OUTPUT AT VS/2

1495 F02

Rail-to-Rail Operation

The simplified schematic, Figure 3, details the circuit
design approach of the LT1494/LT1495/LT1496. The
amplifier topology is a three-stage design consisting of a
rail-to-rail input stage, that continues to operate with the
inputs above the positive rail, a folded cascode second
stage that develops most of the voltage gain, and a rail-to­rail common emitter stage that provides the current gain.

LT1494/LT1495/LT1496

U

WUU

APPLICATIONS INFORMATION

+

V

0.5

0.5

Q3

Q5

D1 D2

Q4 Q16 Q17(V

Q6

0.5

0.5

Q9

+

Q7

Q8

Q10 Q13

+

IN

–

IN

Q2

Q1

D3

) – 0.8V Q19

Q14 Q15

Q11

Q12

C1

+

D7

+

I

1

D4

D5

D6

Q20

Q18

+

R1 R2 I

2

Q21

OUT

Q22

1495 F03

Figure 3. Simplified Schematic

The input stage is formed by two diff amps Q1-Q2 and Q3­Q6. For signals with a common mode voltage between V

EE

and (VCC – 0.8V), Q1 and Q2 are active. When the input
common mode exceeds (VCC – 0.8V), Q7 turns on,
diverting the current from diff amp Q1-Q2 to current
mirror Q8-Q9. The current from Q8 biases on the other diff
amp consisting of PNP’s Q5-Q6 and NPN’s Q3-Q4. Though
Q5-Q6 are driven from the emitters rather than the base,
the basic diff amp action is the same. When the common
mode voltage is between (VCC – 0.8V) and VCC, devices Q3
and Q4 act as followers, forming a buffer between the
amplifier inputs and the emitters of the Q5-Q6. If the
common mode voltage is taken above VCC, Schottky
diodes D1 and D2 reverse bias and devices Q3 and Q4 then

act as diodes. The diff amp formed by Q5-Q6 operates
normally, however, the input bias current increases to the
emitter current of Q5-Q6, which is typically 180nA. The
graph, Input Bias Current vs Common Mode Voltage
found in the Typical Performance Characteristics section,
shows these transitions at three temperatures.

The collector currents of the two-input pairs are combined
in the second stage consisting of Q11 to Q16, which
furnishes most of the voltage gain. Capacitor C1 sets the
amplifier bandwidth. The output stage is configured for
maximum swing by the use of common emitter output
devices Q21 and Q22. Diodes D4 to D6 and current source
Q15 set the output quiescent current.

11

LT1494/LT1495/LT1496

U

TYPICAL APPLICATIONS N

13µA, 0kHz to 10kHz Voltage to Frequency Converter

100k

562k*

V

IN

0V TO 2.5V

1N5712

1N4148

Q1: ZTX-849
*1% METAL FILM

†

POLYSTYRENE

15k

0.0082µF

Q1

390Ω

+

–

LTC®1440

1µF

+

12pF

3.6M TYP

OUTPUT

SELECT FOR 100Hz

= 0.025V

AT V

IN

1/2

LT1495

–

+

360k

39k 10M

†

100pF

0kHz TO 10kHz

270k

5V

1/2

LT1495

0.05µF

10M*

3.9M*

–

3.9M

+

20M

5V

1.2
REFERENCE
LTC1440

0V – 2.5V = 0kHz – 10kHz
SUPPLY CURRENT = 6.2µA QUIESCENT

LINEARITY: ±0.03%
PSRR (4.4V TO 36V): 10ppm/V
TEMPERATURE DRIFT: 250ppm/°C

= 13.3µA AT f = 10kHz

INPUT

0.047µF

φ1

φ2

10M

–

1/2

LTC1441

+

1µF

6µA, AV = 1000, Chopper Stabilized Amplifier

5V

10M

10k

1µF

φ2

φ1

φ2

1M

10M

10M

+

1/2

LT1495

–

–5V

φ1

5V

–

1/2

LTC1441

+

–5V

0.2µF

1M

–

1/2

LT1495

+

GAIN: 1000
OFFSET: 1µV
DRIFT: 50nV/°C
SUPPLY CURRENT: 5.5µA
BANDWIDTH: 0.2Hz
CLOCK RATE: 4Hz

CD4016 QUAD

1495 TA07

OUTPUT

10M

10k

1495 TA08

12

U

TYPICAL APPLICATIONS N

LT1494/LT1495/LT1496

6th Order 10Hz Elliptic Lowpass Filter

100k

15nF15nF

e

in

215k

VS = 5V, 0V
I

= 2µA + ein/150k

S

ZEROS AT 50Hz AND 60Hz

215k

30nF

15nF15nF

215k

80.6k

100nF

100k

+

1/2 LT1495

–

+

169k

169k

169k

30nF

100nF

100k

1/2 LT1495

–

PACKAGE DESCRIPTION

200k

10nF

200k

10nF

U

1495 TA03

10k

10k

OUTPUT

100nF

100nF

Filter Frequency Response

0

–10

–20

–30

GAIN (dB)

–40

–50

–60

1

10 100

FREQUENCY (Hz)

1000

LT1495/96 • TA04

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660)

0.118 ± 0.004*
(3.00 ± 0.102)

0.193 ± 0.006
(4.90 ± 0.15)

0.007
(0.18)

0.021

± 0.006

(0.53 ± 0.015)

* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,

PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

° – 6° TYP

0

SEATING

PLANE

0.009 – 0.015
(0.22 – 0.38)

0.043

(1.10)

MAX

8

12

0.0256
(0.65)

BSC

7

6

5

4

3

0.118 ± 0.004**
(3.00 ± 0.102)

0.034

(0.86)

REF

0.005

± 0.002

(0.13 ± 0.05)

MSOP (MS8) 1100

13

LT1494/LT1495/LT1496

PACKAGE DESCRIPTION

U

N8 Package

8-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

0.255 ± 0.015*
(6.477 ± 0.381)

0.400*

(10.160)

MAX

876

5

12

0.300 – 0.325

(7.620 – 8.255)

0.065

(1.651)

0.009 – 0.015

(0.229 – 0.381)

+0.035

0.325
–0.015

+0.889

8.255

()

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.100

(2.54)

BSC

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

8

3

0.189 – 0.197*
(4.801 – 5.004)

7

6

4

0.130 ± 0.005

(3.302 ± 0.127)

0.125

(3.175)

MIN

0.018 ± 0.003

(0.457 ± 0.076)

5

0.020

(0.508)

MIN

N8 1098

14

0.228 – 0.244

(5.791 – 6.197)

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

× 45°

0°– 8° TYP

0.016 – 0.050

(0.406 – 1.270)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

TYP

0.150 – 0.157**
(3.810 – 3.988)

SO8 1298

1

3

2

4

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

PACKAGE DESCRIPTION

U

N Package

14-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

14

0.255 ± 0.015*
(6.477 ± 0.381)

1213

LT1494/LT1495/LT1496

0.770*

(19.558)

MAX

11

8910

0.300 – 0.325

(7.620 – 8.255)

0.009 – 0.015

(0.229 – 0.381)

+0.035

0.325
–0.015

+0.889

8.255

()

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

0.020

(0.508)

MIN

0.130 ± 0.005

(3.302 ± 0.127)

0.125

(3.175)

MIN

0.005

(0.125)

MIN

S Package

14-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

13

14

0.228 – 0.244

(5.791 – 6.197)

2

31

0.045 – 0.065

(1.143 – 1.651)

0.100
(2.54)

BSC

0.337 – 0.344*
(8.560 – 8.738)

12

6

9

7

0.065

(1.651)

TYP

0.018 ± 0.003

(0.457 ± 0.076)

N14 1098

8

0.150 – 0.157**
(3.810 – 3.988)

5

4

11

10

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

× 45°

0° – 8° TYP

0.016 – 0.050

(0.406 – 1.270)

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

TYP

1

3

2

4

0.050

(1.270)

BSC

5

7

6

0.004 – 0.010

(0.101 – 0.254)

S14 1298

15

LT1494/LT1495/LT1496

–

+

–

+

µA

1495 TA06

1/2

LT1495

1/2

LT1495

100pF

R1

10M

R2
9k

1.5V

1.5V

R3
2k
FULL-SCALE
ADJUST

I

S

= 3µA WHEN IIN = 0

NO ON/OFF SWITCH
REQUIRED

0µA TO
200µA

R4

10k

INPUT

CURRENT

U

TYPICAL APPLICATIONS N

A2

1/2 LT1495

Battery Current Monitor

I

L

CHARGE

DISCHARGE

–

+

2N3904

R

R

A

R

A

DISCHARGE
OUT

B

R

0.1Ω

SENSE

CHARGE

OUT

R

A

R

A

2N3904

5V

–

A1

1/2 LT1495

+

V

= I

O

L RSENSE

FOR RA = 1k, RB = 10k

R

B

V

O

= 1V/A

I

L

VS = 2.7V TO 36V

R

A

1k

R

SENSE

1Ω

LOAD

12V

R

B

()

R

A

1495 TA05

High Side Current Sense

VO = I

–

LT1494

+

R

10k

B

I

L

FOR RA = 1k, RB = 10k, RS = 1Ω

V

O

= 10 V/A

I

L

OUTPUT OFFSET ≈ I

+

OUTPUT CLIPS AT V

V

O

_

R

B

L RS

( )

R

A

0nA to 200nA Current Meter

• RB ≈ 10mV

S

– 2.4V

S

1495 TA09

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LTC®1440/41/42 Micropower Single/Dual Comparators with 1% Reference LTC1440: Single, LTC1441/42: Dual
LTC1443/44/45 Micropower Quad Comparators with 1% Reference LTC1443: 1.182 Reference

LTC1444/45: 1.221V Reference and Adjustable Hysteresis

LT1466/LT1467 75µA Dual/Quad Rail-to-Rail Input and Output Op Amps 390µV V
LT1490A/LT1491A 50µA Dual/Quad Rail-to-Rail Input and Output Op Amps 950µV V
LTC1540 Nanopower Single Comparator with 1% Reference 350nA Supply Current
LT1636 Single Over-The-Top Micropower, 225µV V

Rail-to-Rail Input and Output Op Amp Shutdown Pin, MSOP

LT1672/LT1673/LT1674 2µA MAX, AV ≥ 5 Single/Dual/Quad Over-The-Top Precision Decompensated Version of the LT1494/LT1495/LT1496

Rail-to-Rail Input and Output Op Amps A

≥ 5, Gain-Bandwidth = 12kHz

V

LT2078/LT2079 55µA Dual/Quad Single Supply Op Amps 120µV V
LT2178/LT2179 17µA Dual/Quad Single Supply Op Amps 120µV V
LT1782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail SOT-23, 800µV V

LT1783 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail SOT-23, 800µV V

16

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● [phone]
FAX: [phone]

Input and Output Op Amp Gain-Bandwidth = 200kHz, Shutdown Pin

Input and Output Op Amp in SOT-23 Gain-Bandwidth = 1.2MHz, Shutdown Pin

●

TELEX: 499-3977 ● www.linear.com

, Gain Bandwidth = 120kHz

OS(MAX)

, Gain Bandwidth = 200kHz

OS(MAX)

, IS = 55µA (MAX), Gain-Bandwidth = 200kHz

OS(MAX)

, Gain Bandwidth = 200kHz

OS(MAX)

, Gain Bandwidth = 60kHz

OS(MAX)

, IS = 55µA (Max),

OS(MAX)

, IS = 300µA (Max),

OS(MAX)

149456fb LT/TP 0801 1.5K REV B • PRINTED IN USA

 LINEAR TECHNOLOG Y CORPORATION 1997