Datasheet LT1493, LT1492 Datasheet (Linear Technology)

FEATURES

■

Gain-Bandwidth Product: 5MHz Typ

■

Slew Rate: 3V/µs Typ

■

Low Supply Current per Amplifier: 0.55mA Max

■

Input Offset Voltage: 180µV Max

■

Input Offset Voltage Drift: 3µV/°C Max

■

Input Offset Current: 20nA Max

■

Input Bias Current: 100nA Max

■

Open-Loop Gain: 1500V/mV Min (VS = ±15V)

■

Low Input Noise Voltage: 16.5nV/√Hz

■

Low Input Noise Current: 0.14pA/√Hz

■

Large Output Drive Current: 20mA Min

■

Single Supply Operation

Input Voltage Range Includes Ground
Output Swings to Ground While Sinking Current

■

Wide Supply Voltage Range: 2.5V to 36V

■

Specified on 3.3V, 5V and ±15V

■

Dual in 8-Pin PDIP and SO Package

■

Quad in a Narrow 16-Pin SO Package

LT1492/LT1493

5MHz, 3V/µs, Low Power

Single Supply, Dual and Quad

Precision Op Amps

U

DESCRIPTION

The LT®1492/LT1493 are dual/quad, low power, single sup­ply precision op amps with 5MHz gain-bandwidth product,
3V/µs slew rate and only 450µ A of quiescent supply current
per amplifier.

With a maximum input offset voltage of only 180µV, the
LT1492/LT1493 eliminate trims in most systems while pro­viding high frequency performance not usually found in low
power single supply amplifiers.

The LT1492/LT1493 will operate on any supply greater than

2.5V and less than 36V total, and are specified on single 3.3V,
single 5V and ±15V supplies. Even with their low quiescent
supply current the minimum output drive is 20mA, ideal for
driving low impedance loads.

The inputs can be driven beyond the supplies without
damage or phase reversal of the output. The low operating
voltage and wide input and output range make the LT1492/
LT1493 amplifiers ideal for battery-powered applications.

U

APPLICATIONS

■

Battery-Powered Systems

Portable Instrumentation

■

Active Filters

■

Photodiode Amplifiers

■

DAC Current to Voltage Amplifiers

TYPICAL APPLICATION

Precision AC to DC Converter (Full Wave Rectifier and Filter)

4.99k

5V

10k

V

IN

–

1/2 LT1492

+

15k

U

+

1/2 LT1492

–

10k

6.49k

VS = 5V, 0V
< 1% ERROR FROM 100mV TO 1V, f = 1kHz
10% ERROR AT 10mV, f = 1kHz
1% ERROR AT 5kHz, V
10% ERROR AT 30kHz, V

10k

+

= 100mV

IN

For applications requiring faster precision single supply
amplifiers, see the 14MHz, 7V/µs LT1211/LT1212, the
28MHz, 12V/µs LT1213/LT1214 or the 23MHz, 50V/µs
LT1215/LT1216.

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

Distribution of Offset Voltage

Drift with Temperature

50

VS = 5V, 0V
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE

40

30

DC

V

10µF

= 100mV

IN

OUT

RMS

RMS



1492/93 TA01

20

PERCENT OF UNITS (%)

10

0

–1.5

–1

–2 2

–2.5

OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)

–0.5

0.5

1

0

1.5

2.5

1492/93 G02

1

LT1492/LT1493

1
2
3
4
5
6
7
8



TOP VIEW

S PACKAGE

16-LEAD PLASTIC SO

16
15
14
13
12
11
10

9



OUT A

–IN A
+IN A

V

+


+IN B
–IN B

OUT B

NC

OUT D
–IN D
+IN D
V

–


+IN C
–IN C
OUT C
NC

C

A

D

B

WW

W

U

ABSOLUTE MAXIMUM RATINGS

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

Input Current ...................................................... ±15mA

Output Short-Circuit Duration (Note 1) .........Continuous

Operating Temperature Range ................ –40°C to 85°C

U

W

U

PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

OUT A 

1

–IN A

2

+IN A

A

3

–

V

4

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

T

= 150°C, θJA = 130°C/ W (N8)

JMAX

T

= 150°C, θJA = 190°C/ W (S8)

JMAX

V+

8

OUT B

7

–IN B

6

B

+IN B

5



NUMBER

LT1492CN8
LT1492CS8

S8 PART MARKING

1492

Specified Temperature Range (Note 2) .....

–40°C to 85°C

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

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

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

ORDER PART

NUMBER

LT1493CS

T

= 150°C, θJA = 150°C/ W

JMAX

Consult factory for Industrial and Military grade parts.

5V ELECTRICAL CHARACTERISTICS

VS = 5V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

∆V

OS

∆Time
I

OS

I

B

e

n

i

n

CMRR Common Mode Rejection Ratio VCM = 0V to 3.4V 86 102 dB
PSRR Power Supply Rejection Ratio VS = 2.5V to 12.5V 90 110 dB

2

Input Offset Voltage 100 180 µV
Long-Term Input Offset Voltage Stability 0.6 µV/Mo

Input Offset Current 520 nA
Input Bias Current 50 100 nA
Input Noise Voltage 0.1Hz to 10Hz 330 nV
Input Noise Voltage Density fO = 10Hz 17.3 nV/√Hz

Input Noise Current Density fO = 10Hz 0.78 pA/√Hz

Input Resistance (Note 3) Differential Mode 10 40 MΩ

Input Capacitance f = 1MHz 10 pF
Input Voltage Range 3.4 3.60 V

= 0.5V, TA = 25°C, unless otherwise noted.

OUT

= 1000Hz 16.5 nV/√Hz

f

O

= 1000Hz 0.14 pA/√Hz

f

O

Common Mode 800 MΩ

0 –0.25 V

P-P

5V ELECTRICAL CHARACTERISTICS

LT1492/LT1493

VS = 5V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

A

VOL

I

O

SR Slew Rate AV = –2 1.8 V/µs
GBW Gain-Bandwidth Product f = 100kHz 4.5 MHz
I

S

tr, t

f

OS Overshoot AV = 1, VO = 100mV 20 %
t

PD

t

S

THD Total Harmonic Distortion AV = 1, VO = 1V

Large-Signal Voltage Gain VO = 0.05V to 3.7V, RL = 2k 175 350 V/mV
Maximum Output Voltage Swing Output High, No Load 4.2 4.35 V

(Note 4) Output High, I

Maximum Output Current (Note 8) ±20 ±60 mA

Supply Current per Amplifier 425 550 µA
Minimum Supply Voltage 2.1 2.5 V
Full Power Bandwidth AV = 1, VO = 2.5V
Rise Time, Fall Time AV = 1, 10% to 90%, VO = 100mV 100 ns

Propagation Delay AV = 1, VO = 100mV 100 ns
Settling Time 0.01%, AV = 1, ∆VO = 2V 2.6 µs
Open-Loop Output Resistance IO = 0mA, f = 2MHz 130 Ω

= 0.5V, TA = 25°C, unless otherwise noted.

OUT

Output High, I
Output Low, No Load 0.003 0.006 V

Output Low, I
Output Low, I

= 1mA 4.1 4.25 V

SOURCE

= 15mA 3.0 3.15 V

SOURCE

= 1mA 0.062 0.075 V

SINK

= 15mA 0.362 0.500 V

SINK

P-P

, f = 20Hz to 20kHz 0.005 %

RMS

150 kHz

VS = 5V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

V

OS

∆T

I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = 0V to 3.4V ● 84 102 dB
PSRR Power Supply Rejection Ratio VS = 2.5V to 12.5V ● 90 110 dB
A

VOL

I

S

Input Offset Voltage ● 120 280 µV
Input Offset Voltage Drift (Note 3) ● 13µV/°C

Input Offset Current ● 525 nA
Input Bias Current ● 55 110 nA
Input Voltage Range ● 3.4 3.55 V

Large-Signal Voltage Gain VO = 0.05V to 3.7V, RL = 2k ● 140 250 V/mV
Maximum Output Voltage Swing Output High, No Load ● 4.1 4.25 V

(Note 4) Output High, I

Supply Current per Amplifier ● 470 650 µA

= 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.

OUT

Output High, I
Output Low, No Load ● 0.004 0.007 V

Output Low, I
Output Low, I

SOURCE
SOURCE

= 1mA ● 0.070 0.085 V

SINK

= 15mA ● 0.390 0.525 V

SINK

● 0 –0.15 V

= 1mA ● 4.0 4.15 V
= 15mA ● 2.9 3.05 V

3

LT1492/LT1493

5V ELECTRICAL CHARACTERISTICS

VS = 5V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

V

OS

∆T
I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = 0V to 3.4V ● 80 90 dB
PSRR Power Supply Rejection Ratio VS = 2.5V to 12.5V ● 90 110 dB
A

VOL

I

S

Input Offset Voltage ● 150 325 µV
Input Offset Voltage Drift (Note 3) ● 13µV/°C

Input Offset Current ● 540 nA
Input Bias Current ● 55 130 nA
Input Voltage Range ● 3.4 3.5 V

Large-Signal Voltage Gain VO = 0.05V to 3.7V, RL = 2k ● 140 220 V/mV
Maximum Output Voltage Swing Output High, No Load ● 3.95 4.15 V

(Note 4) Output High, I

Supply Current per Amplifier ● 480 700 µA

= 0.5V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2)

OUT

= 1mA ● 3.85 4.05 V

SOURCE

Output High, I
Output Low, No Load ● 0.005 0.008 V

Output Low, I
Output Low, I

= 15mA ● 2.75 2.95 V

SOURCE

= 1mA ● 0.073 0.095 V

SINK

= 15mA ● 0.400 0.575 V

SINK

● 0 – 0.1 V

±15V ELECTRICAL CHARACTERISTICS

VS = ±15V, VCM = 0V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = –15V to 13.4V 86 102 dB
PSRR Power Supply Rejection Ratio VS = ±2V to ±16V 90 113 dB
A

VOL

I

O

SR Slew Rate AV = –2, (Note 5) 2 3 V/µs
GBW Gain-Bandwidth Product f = 100kHz 3 5 MHz
I

S

t

S

Input Offset Voltage 120 450 µV
Input Offset Current 520 nA
Input Bias Current 45 100 nA
Input Voltage Range 13.4 13.6 V

Large-Signal Voltage Gain VO = ±10V, RL = 5k 1500 6500 V/mV
Maximum Output Voltage Swing Output High, I

Maximum Output Current (Note 8) ±20 ±55 mA

Supply Current per Amplifier 500 800 µA
Channel Separation VO = ±10V, RL = 5k 128 140 dB
Minimum Supply Voltage ±1.4 ±2V
Full Power Bandwidth AV = 1, VO = 20V
Settling Time 0.01%, AV = 1, ∆VO = 10V 5.8 µs

= 0V, TA = 25°C, unless otherwise noted.

OUT

Output Low, I

–15.0 –15.2 V

= 15mA 12.9 13.15 V

SOURCE

= 15mA –14.4 –14.6 V

SINK

P-P

30 kHz

4

±15V ELECTRICAL CHARACTERISTICS

LT1492/LT1493

VS = ±15V, VCM = 0V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

V

OS

∆T
I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = –15V to 13.4V ● 84 101 dB
PSRR Power Supply Rejection Ratio VS = ±2V to ±16V ● 90 108 dB
A

VOL

I

S

Input Offset Voltage ● 160 550 µV
Input Offset Voltage Drift (Note 3) ● 13µV/°C

Input Offset Current ● 10 30 nA
Input Bias Current ● 55 120 nA
Input Voltage Range ● 13.4 13.5 V

Large-Signal Voltage Gain VO = ±10V, RL = 5k ● 1200 4000 V/mV
Maximum Output Voltage Swing Output High, I

Supply Current per Amplifier ● 600 930 µA

VS = ±15V, VCM = 0V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

V

OS

∆T

I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = –15V to 13.4V ● 82 101 dB
PSRR Power Supply Rejection Ratio VS = ±2V to ±16V ● 90 108 dB
A

VOL

I

S

Input Offset Voltage ● 180 650 µV
Input Offset Voltage Drift (Note 3) ● 13µV/°C

Input Offset Current ● 10 50 nA
Input Bias Current ● 55 150 nA
Input Voltage Range ● 13.4 13.45 V

Large-Signal Voltage Gain VO = ±10V, RL = 5k ● 1000 3500 V/mV
Maximum Output Voltage Swing Output High, I

Supply Current per Amplifier ● 620 1000 µA

= 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.

OUT

= 15mA ● 12.7 13.0 V

SOURCE

Output Low, I

= 0V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2)

OUT

Output Low, I

= 15mA ● –14.2 –14.6 V

SINK

= 15mA ● 12.5 12.9 V

SOURCE

= 15mA ● –14.1 –14.6 V

SINK

● –15.0 –15.1 V

● –15.0 –15.05 V

5

LT1492/LT1493

3.3V ELECTRICAL CHARACTERISTICS

VS = 3.3V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

O

Input Offset Voltage 100 180 µV
Input Voltage Range (Note 7) 1.7 1.9 V

Maximum Output Voltage Swing Output High, No Load 2.50 2.65 V

Maximum Output Current ±20 ±50 mA

VS = 3.3V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

Input Offset Voltage ● 120 280 µV
Input Voltage Range (Note 7) ● 1.7 1.8 V

Maximum Output Voltage Swing Output High, No Load ● 2.4 2.55 V

= 0.5V, TA = 25°C, unless otherwise noted. (Note 6)

OUT

Output High, I
Output High, I

Output Low, No Load 0.003 0.006 V
Output Low, I
Output Low, I

= 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 6)

OUT

Output High, I
Output High, I

Output Low, No Load ● 0.004 0.007 V
Output Low, I
Output Low, I

= 1mA 2.40 2.55 V

SOURCE

= 15mA 1.30 1.45 V

SOURCE

= 1mA 0.062 0.075 V

SINK

= 15mA 0.362 0.500 V

SINK

= 1mA ● 2.3 2.45 V

SOURCE

= 15mA ● 1.2 1.35 V

SOURCE

= 1mA ● 0.070 0.085 V

SINK

= 15mA ● 0.390 0.525 V

SINK

0 –0.2 V

● 0 – 0.1 V

VS = 3.3V, 0V; VCM = 0.5V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

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

Note 1: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.

Note 2: The LT1492/LT1493 are designed, characterized and expected to
meet these extended temperature limits, but are not tested at –40°C and
85°C. Guaranteed I grade parts are available. Consult factory.

Note 3: This parameter is not 100% tested.
Note 4: Guaranteed by correlation to V

Input Offset Voltage ● 150 325 µV
Input Voltage Range (Note 7) ● 1.7 1.75 V

Maximum Output Voltage Swing Output High, No Load ● 2.25 2.45 V

= 0.5V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Notes 2, 6)

OUT

= 1mA ● 2.15 2.35 V

SOURCE

= 15mA ● 1.05 1.25 V

SOURCE

= 1mA ● 0.073 0.095 V

SINK

= 15mA ● 0.400 0.575 V

SINK

Note 5: Slew rate is measured between ±5V on an output swing of ±10V
on ±15V supplies.

Note 6: Most LT1492/LT1493 electrical characteristics change very little
with supply voltage. See the 5V tables for characteristics not listed in the

3.3V table.

Note 7: Guaranteed by correlation to V
Note 8: Guaranteed by correlation to VS = 3.3V tests.

= 3.3V and VS = ±15V tests.

S

Output High, I
Output High, I

Output Low, No Load ● 0.005 0.008 V
Output Low, I
Output Low, I

● 0 –0.05 V

= 5V and VS = ±15V tests.

S

6

LT1492/LT1493

TEMPERATURE (°C)

–50

SLEW RATE (V/µs)

3

4

25 75

1492/93 G06

2

–25 0

50 100 125

1

AV = –2
R

L

= 10k

V

S

= ±15V

V

S

= 5V

UW

TYPICAL PERFORMANCE CHARACTERISTICS

Distribution of Offset Voltage Drift
with TemperatureDistribution of Input Offset Voltage Distribution of Input Offset Voltage

40

VS = 5V, 0V
LT1492 N8, S8 PACKAGES

35

LT1493 S16 PACKAGE

30

25

20

15

PERCENT OF UNITS (%)

10

5

0
–200

–150

–100

INPUT OFFSET VOLTAGE (µV)

–50

0

50

100

150

1492/93 G01

200

Voltage Gain, Phase vs Frequency Slew Rate vs Temperature

80
70
60
50
40

30
20

VOLTAGE GAIN (dB)

10

–10
–20

1k

10k 100k 1M 10M

PHASE

GAIN

VS = ±2.5V

FREQUENCY (Hz)

VS = ±15V

VS = 5V

VS = ±15V

120
100
80
60
40

20
0
–20
–400
–60
–80

1492/93 G04

50

VS = 5V, 0V
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE

40

30

20

PERCENT OF UNITS (%)

10

0

–1.5

–2.5

OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)

–1

–2 2

–0.5

0.5

1

0

Gain-Bandwidth Product,
Phase Margin vs Supply Voltage

5.5

5.0

PHASE SHIFT (DEG)

4.5

4.0

PRODUCT (MHz)

GAIN-BANDWIDTH

3.5
70
60
50

40
30

PHASE MARGIN (DEG)

20

1

T

TOTAL SUPPLY VOLTAGE (V)

= –55°C

A



T

A

TA = 125°C

TA = 125°C

105403020

1.5

1492/93 G02

= 25°C

TA = –55°C

= 25°C

T

A

2.5

1492/93 G05

40

VS = ±15V
LT1492 N8,

35

S8 PACKAGES
LT1493 

30

S16 PACKAGE

25

20

15

PERCENT OF UNITS (%)

10

5

0

–300

–400

–200

INPUT OFFSET VOLTAGE (µV)

–100

0

100

200

300

1492/93 G03

400

Undistorted Output Swing

Slew Rate vs Supply Voltage

4

AV = –2

= 10k

R

L

TA = 125°C

3

2

SLEW RATE (V/µs)

1

0

412

8

TOTAL SUPPLY VOLTAGE (V)

16

TA = 25°C

TA = –55°C

28

20 36

32

24

1492/93 G07

Capacitive Load Handling

80

VS = ±2.5V

70

60

50

40

30

OVERSHOOT (%)

20

10

0

10

AV = 1 AV = 5

100 1000 10000

CAPACITIVE LOAD (pF)

AV = 10

1492/93 G08

vs Frequency, VS = ±2.5V

5

AV = –1

AV = 1

4

)

P-P

3

2

OUTPUT SWING (V

1

VS = ±2.5V

= 100k

R

L

DISTORTION ≤ 1%

0

1k

10k 100k 1M

FREQUENCY (Hz)

1492/93 G09

7

LT1492/LT1493

LOAD RESISTANCE (kΩ)

100

OPEN-LOOP VOLTAGE GAIN (V/mV)

1000

10000

100000

0468

10

2

10

1492/93 G15

TA = 25°C

V

S

= ±15V

V

S

= 5V, 0V

UW

TYPICAL PERFORMANCE CHARACTERISTICS

Undistorted Output Swing
vs Frequency, VS = ±15V

30

25

)

P-P

20

15

10

OUTPUT SWING (V

VS = ±15V

5

= 100k

R

L

DISTORTION ≤ 1%

0

1k

FREQUENCY (Hz)

Open-Loop Gain, VS = 5V

RL = 2k

R

= 5k

L

INPUT, 5µV/DIV

AV = –1AV = 1

10k 100k

1492/93 G10

Total Harmonic Distortion
and Noise vs Frequency

1

VS = 5V, 0V

= 3V

V

OUT

= 2k

R

L

0.1

0.01

0.001

0.0001

TOTAL HARMONIC DISTORTION AND NOISE (%)

10



P-P

AV = 10

AV = 1

1k 10k100 100k

FREQUENCY (Hz)

Positive Output Saturation
Voltage vs Load Current

2.5

(V)

VS = 5V, 0V

OUT

2.0

– V

+

1.5

1.0

TA = –55°C

1492/93 G11

Open-Loop Voltage Gain
vs Supply Voltage

5000

RL = 2k

20

TA = –55°C

TA = 125°C

24

4000

3000

2000

1000

OPEN-LOOP VOLTAGE GAIN (V/mV)

0

8

0

12

436

16

TOTAL SUPPLY VOLTAGE (V)

Voltage Gain vs Load Resistance

TA = 25°C

28

32

40

1492/93 G12

012 3 45

Open-Loop Gain, VS = ±15V

= 2k

R

L

INPUT, 5µV/DIV

RL = 5k

–10

OUTPUT (V)

OUTPUT (V)

1492/93 G13

1492/93 G16

0.5
TA = 125°C TA = 25°C

POSITIVE OUTPUT SATURATION, V

0

–0.01

–0.001

Negative Output Saturation
Voltage vs Load Current

1000

VS = 5V, 0V

100

10

TA = 125°C

100

TA = 25°C, –55°C

NEGATIVE OUTPUT SATURATION (mV)

1

0.001 0.01

–1

–0.1

LOAD CURRENT (mA)

0.1 1 10 100

LOAD CURRENT (mA)

–10

1492/93 G17

1492/93 G14

–100

Channel Separation vs Frequency

130

120

110

100

90

80

CHANNEL SEPARATION (dB)

70

60

1k 100k 1M 10M

10k

FREQUENCY (Hz)

VS = ±15V

1492/93 G18

8

UW

SETTLING TIME (µs)

0

–10

OUTPUT STEP (V)

–6

–2

2

1

2

34

1492/93 G27

5

6

10

V

S

= ±15V

–8

–4

0

4

8

6

NONINVERTING

NONINVERTING

INVERTING

INVERTING

TYPICAL PERFORMANCE CHARACTERISTICS

Output Short-Circuit Current
vs Temperature

80

VS = ±2.5V
SOURCING

70

60

50

40

OUTPUT SHORT-CIRCUIT CURRENT (mA)

30

–50

–25

VS = ±15V

SOURCING

OR SINKING

0

TEMPERATURE (°C)

VS = ±2.5V
SINKING

50

25

100

1492/93 G19

125

75

Output Impedance vs Frequency 5V Small-Signal Response

1000

VS = ±2.5V

100

AV = 100

10

AV = 10

1

OUTPUT IMPEDANCE (Ω)

AV = 1

0.1

10k 1M 10M

100k

FREQUENCY (Hz)

1492/93 G20

20mV/DIV

VS = 5V
A

= 1

V

LT1492/LT1493

500ns/DIV

1492/93 G21

5V Large-Signal Response

500mV/DIV

VS = 5V
A

= 1

V

2µs/DIV

±15V Large-Signal Response

5V/DIV

1492/93 G22

5V Large-Signal Response

500mV/DIV

VS = 5V
A

= –1

V

R

= RG = 2k

F

2µs/DIV

±15V Large-Signal Response

5V/DIV

1492/93 G23

±15V Small-Signal Response

20mV/DIV

VS = ±15V
A

= 1

V

500ns/DIV

Settling Time to 1mV
vs Output Step

1492/93 G24

VS = ±15V
A

= 1

V

5µs/DIV

1492/93 G25

VS = ±15V
A

= –1

V

R

= RG = 2k

F

5µs/DIV

1492/93 G26

9

LT1492/LT1493

FREQUENCY (Hz)

40

POWER SUPPLY REJECTION RATIO (dB)

60

80

100

120

1k 100k 1M 10M

1492/93 G26

20

10k

POSITIVE SUPPLY

NEGATIVE SUPPLY

VS = ±15V
A

V

= 100

UW

TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Temperature

0.65

0.55

0.45

0.35

SUPPLY CURRENT PER AMPLIFIER (mA)

0.25
–25 0 50

–50

VS = ±15V

V

= 5V, 0V

S

25

TEMPERATURE (°C)

Input Bias Current vs Temperature

65

VS = 5V, 0V

60

55

50



INPUT BIAS CURRENT (nA)

I

OS

45

40

35

30

–50

–25 0

+I

B

–I

B

50 100 125

25 75

TEMPERATURE (°C)

75 100 125

1492/93 G28

1492/93 G31

Supply Current vs Supply Voltage

1.0

0.8

0.6

0.4

0.2

SUPPLY CURRENT PER AMPLIFIER (mA)

0

0

1

SUPPLY VOLTAGE (V)

TA = 125°C

TA = 25°C

T

A

2

3

Input Bias Current
vs Common Mode Voltage

20

VS = 5V, 0V

0
–20
–40

TA = 125°C

1

TA = –55°C

2

–60
–80

–100
–120
–140
–160

INPUT BIAS CURRENT (nA)

–180
–200
–220

TA = 25°C

0

–1

COMMON MODE VOLTAGE (V)

= –55°C

4

3

1492/93 G29

1492/93 G32

10

8
6
4
2

0
–2
–4
–6

CHANGE IN OFFSET VOLTAGE (µV)

–8

5

4

–10

+

V

+

V

– 1

V+ – 2

–

V

+ 2

–

V

COMMON MODE RANGE (V)

–

– 1

V

–50

Warm-Up Drift vs Time

N8 PACKAGE

= ∞

R

L

VS = ±2.5V

VS = ±15V

20

30

10 90

0

40

50

TIME (SEC)

60

70

Common Mode Range
vs Temperature

–25 25 50 75 100 125

0

TEMPERATURE (°C)

80

1492/93 G30

1492/93 G33

100

Input Noise Current, Noise Voltage
Density vs Frequency

20
18
16
14
12

10

8
6
4
2

INPUT NOISE VOLTAGE DENSITY (nV/√Hz)

0

10

10

VOLTAGE NOISE

CURRENT NOISE

100 1k 10k

FREQUENCY (Hz)

VS = ±15V

= 25°C

T

A

1492/93 G34

0.4

0.2
0

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

Common Mode Rejection Ratio
vs Frequency

100

INPUT NOISE CURRENT DENSITY (pA/√Hz)

VS = ±2.5V

80

60

40

20

COMMON MODE REJECTION RATIO (dB)

0

10k

100k 1M 10M

FREQUENCY (Hz)

Input Referred Power Supply
Rejection Ratio vs Frequency

1492/93 G35

LT1492/LT1493

U

WUU

APPLICATIONS INFORMATION

Supply Voltage

The LT1492/LT1493 op amps are fully functional and all
internal bias circuits are in regulation with 2.1V of supply.
The amplifiers will continue to function with as little as

1.6V, although the input common mode range and the
phase margin are about gone. The minimum operating
supply voltage is guaranteed by the PSRR tests that are
done with the input common mode equal to 500mV and a
minimum supply voltage of 2.5V.

The positive supply pin of the LT1492/LT1493 should be
bypassed with a small capacitor (about 0.01µ F) within an
inch of the pin. When driving heavy loads and for good
settling time, an additional 4.7µF capacitor should be
used. When using split supplies, the same is true for the
negative supply pin.

Power Dissipation

The LT1492/LT1493 combine high speed and large output
drive in small packages. Because of the wide supply
voltage range, it is possible to exceed the maximum
junction temperature under certain conditions. Maximum
junction temperature (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:

LT1492CN8: TJ = TA + (PD • 130°C/W)
LT1492CS8: TJ = TA + (PD • 190°C/W)
LT1493CS: TJ = TA + (PD • 150°C/W)

Worst-case power dissipation occurs at the maximum
supply current and when the output voltage is at 1/2 of
either supply voltage (or the maximum swing if less than
1/2 supply voltage). For each amplifier P

P

= (V+ – V–)(I

DMAX

Example: LT1493 at 70°C, VS = ±15V, RL = 1k

P

= (30V)(930µA) + (7.5V)2/1kΩ = 84.2mW

DMAX

) + (V+/2)2/R

SMAX

DMAX

L

is:

still functional. However, the input bias current will shift as
shown in the characteristic curves. For full precision
performance, the common mode range should be limited
between ground (V–) and 1.5V below the positive supply.

When either of the inputs is taken below ground (V–) by
more than about 700mV, that input current will increase
dramatically. The current is limited by internal 100Ω
resistors between the input pins and diodes to each
supply. The output will remain low (no phase reversal) for
inputs 1.3V below ground (V–). If the output does not have
to sink current, such as in a single supply system with a 1k
load to ground, there is no phase reversal for inputs up to
8V below ground.

There are no clamps across the inputs of the LT1492/
LT1493 and therefore each input can be forced to any
voltage between the supplies. The input current will re­main constant at about 50nA over most of this range.
When an input gets closer than 1.5V to the positive supply,
that input current will gradually decrease to zero until the
input goes above the supply, then will increase due to the
previously mentioned diodes. If the inverting input is held
more positive than the noninverting input by 200mV or
more, while at the same time the noninverting input is
within 300mV to ground (V–), then the supply current will
increase by 1mA and the noninverting input current will
increase to about 10µA. This should be kept in mind in
comparator applications where the inverting input stays
above ground (V–) and the noninverting input is at or near
ground (V–).

Output

The output of the LT1492/LT1493 will swing to within

0.65V of the positive supply and to within 3mV of the
negative supply with no load. Under loaded conditions see
the Typical Performance curves for the output saturation
voltage characteristics.

T

= 70°C + (4 • 84.2mW)(150°C/W) = 121°C

JMAX

Inputs

Typically, at room temperature, the inputs of the LT1492/
LT1493 can common mode 400mV below ground (V–)
and to within 1.2V of the positive supply with the amplifier

The output of the LT1492/LT1493 has reverse-biased
diodes to each supply. If the output is forced beyond either
supply, unlimited currents will flow. If the current is
transient and limited to several hundred milliamps, no
damage will occur.

11

LT1492/LT1493

U

WUU

APPLICATIONS INFORMATION

Feedback Components

Because the input currents of the LT1492/LT1493 are less
than 100nA, it is possible to use high value feedback
resistors to set the gain. However, care must be taken to
insure that the pole that is formed by the feedback resis­tors and the input capacitance does not degrade the
stability of the amplifier. For example, if a single supply,
noninverting gain of 2 is set with two 62k resistors, the
LT1492/LT1493 will probably oscillate. This is because
the amplifier goes open-loop at 1MHz (6dB of gain) and
has 50° of phase margin. The feedback resistors and the
10pF input capacitance generate a pole at 500kHz that
introduces 63° of phase shift at 1MHz! The solution is
simple, lower the values of the resistors or add a feedback
capacitor of 10pF or more.

Capacitive Loading

The LT1492/LT1493 are optimized for low voltage, single
supply operation. The Maximum Capacitive Load vs Load
Current typical performance curve shows the circuit per­formance without any load resistance. When the output is
sinking current or driving heavy loads with high supplies,
capacitive load handling is degraded.

Maximum Capacitive Load vs Load Current

10000

1000

SOURCING
SINKING

VS = ±2.5V

Comparator Applications

Sometimes it is desirable to use an op amp as a compara­tor. When operating the LT1492/LT1493 on a single 3.3V
or 5V supply, the output interfaces directly with most TTL
and CMOS logic.

The response time of the LT1492/LT1493 is a strong
function of the amount of input overdrive as shown in the
following photos. These amplifiers are unity-gain stable
op amps and not fast comparators, therefore, the logic
being driven may oscillate due to the long transition time.
The output can be speeded up by adding 20mV or more of
hysteresis (positive feedback), but the offset is then a
function of the input direction.

Comparator Response (+)

20mV, 10mV, 5mV, 2mV Overdrives

4

2

0

100

0

INPUT (mV) OUTPUT (V)

V
R

= 5V

S

= ∞

L

20µs/DIV

Comparator Response (–)

20mV, 10mV, 5mV, 2mV Overdrives

1492/93 AI02

12

= ±15V

V

S

100

MAXIMUM CAPACITIVE LOAD (pF)

10

0.1

V

= ±2.5V

S

= ±15V

V

S

1 10 100

LOAD CURRENT (mA)

1492/93 AI01

4

2

OUTPUT (V)

0

100

0

INPUT (mV)

R

L

= ∞

20µs/DIVVS = 5V

1492/93 AI02

WW

SI PLIFIED SCHE ATIC

I

1

I

I

3

2

LT1492/LT1493

+

V

I

4

I

5

I

6

Q4

Q3

–IN

Q1

Q7

Q8

Q5

Q9

C

I

Q6

U

TYPICAL APPLICATIONS

1A Voltage-Controlled Current Source 1A Voltage-Controlled Current Sink

+

V

1k

1k

V

IN

–

LT1492

1/2

+

1k

I

OUT

tr < 1µs

1Ω

1k

200pF

100Ω

V



IN

=

1Ω

Q13

Q14

Q15

OUT

Q16

C

I

O

8

–

V

1492/93 SS

+

V

+

100Ω

100pF

1k

V



IN

=

1Ω

R

L

I

OUT

Si9410DY
N-CHANNEL

1Ω

1492/93 TA06

Q12

+

LT1492

–

BIAS

V

1/2

I

OUT

tr < 1µs

C

M

+IN

Q2

Q10

Si9430DY
P-CHANNEL

I

OUT

R

L

1492/93 TA05

Q11

R

F

C

F

I

7

V

IN

Ground Current Sense Amplifier

+

V

LOAD

5V

0.1µF

+

1/2

100Ω

LT1492

–

1910Ω

100pF

I

IN

0.05Ω

VO = 1V/A

OFFSET ≤ 3.6mA
BANDWIDTH = 250kHz

= 1µs

t

r

1492/93 TA07

13

LT1492/LT1493

PACKAGE DESCRIPTION

U

Dimensions in inches (millimeters) unless otherwise noted.

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.400*

(10.160)

MAX

876

5

0.255 ± 0.015*
(6.477 ± 0.381)





12

0.300 – 0.325

(7.620 – 8.255)

0.065

(1.651)

0.009 – 0.015

(0.229 – 0.381)

+0.025

0.325
–0.015

+0.635

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

(2.540 ± 0.254)

0.045 – 0.065

(1.143 – 1.651)

0.005

(0.127)

MIN

0.100 ± 0.010

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

3

0.189 – 0.197*
(4.801 – 5.004)

7

8

4

0.130 ± 0.005

(3.302 ± 0.127)

0.125

(3.175)

MIN



0.018 ± 0.003

(0.457 ± 0.076)

5

6

0.015

(0.380)

MIN

N8 0695

14

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

0.228 – 0.244

(5.791 – 6.197)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

0.150 – 0.157**
(3.810 – 3.988)

1

3

2

4

(0.101 – 0.254)

0.050

(1.270)

TYP

0.004 – 0.010

SO8 0996

PACKAGE DESCRIPTION

U

Dimensions in inches (millimeters) unless otherwise noted.

S Package

16-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.386 – 0.394*
(9.804 – 10.008)

13

16

14

15

12

11 10

LT1492/LT1493

9

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

0.228 – 0.244

(5.791 – 6.197)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

0.150 – 0.157**
(3.810 – 3.988)

4

5

0.050

(1.270)

TYP

3

2

1

7

6

8

0.004 – 0.010

(0.101 – 0.254)

S16 0695

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.

15

LT1492/LT1493

FREQUENCY (Hz)

GAIN (dB)

10

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

100 10k 100k 10M

1492/93 TA04

1k 1M

TYPICAL APPLICATION

U

Single Supply 100kHz 4th Order Butterworth Filter

6.81k

6.81k

V

IN

11.3k

330pF

100pF

–

1/2 LT1492

+

5.23k

5.23k 10.2k

1000pF

47pF

V

–

1/2 LT1492

+

V

OUT

Frequency Response

+

V+/2

1492/93 TA03

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LTC®1152 Rail-to-Rail Input and Output, Zero-Drift Op Amp High DC Accuracy, 10 µ V V

GBW, 1V/ µs Slew Rate, Max Supply Current 2.2mA

LT1211/LT1212 Dual/Quad 14MHz, 7V/ µs, Single Supply Precision Op Amps Input Common Mode Includes Ground, 275 µV V

6µV/°C Max Drift, Max Supply Current 1.8mA per Amplifier

LT1213/LT1214 Dual/Quad 28MHz, 12V/ µs, Single Supply Precision Op Amps Input Common Mode Includes Ground, 275 µV V

6µV/°C Max Drift, Max Supply Current 3.5mA per Amplifier

LT1215/LT1216 Dual/Quad 23MHz, 50V/ µs, Single Supply Precision Op Amps Input Common Mode Includes Ground, 450 µV V

Max Supply Current 6.6mA per Amplifier

LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps 475 µV V

, 400kHz GBW, 0.13V/ µ s Slew Rate,

OS(MAX)

Max Supply Current 520 µA per Amplifier

LT1490/LT1491 Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps Max Supply Current 50 µA per Amplifier, 200kHz GBW, 0.07V/ µs

Slew Rate, Operates with Inputs 44V Above V

LT1498/LT1499 Dual/Quad Rail-to-Rail Input and Output Precision C-Load

TM

475µV V

, 10MHz GBW, 6V/ µ s Slew Rate,

OS(MAX)

Op Amps Max Supply Current 2.2mA per Amplifier

C-Load is a trademark of Linear Technology Corporation.

, 100nV/ °C Drift, 1MHz

OS(MAX)

,

OS(MAX)

,

OS(MAX)

,

OS(MAX)

–

Independent of V

+

16

Linear Technology Corporation

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

●

TELEX: 499-3977 ● www.linear-tech.com

14923f LT/TP 1097 4K • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1997