Datasheet LT1782 Datasheet (LINEAR TECHNOLOGY)

–900 –600 –300 0 300 600 900

PERCENTAGE OF AMPLIFIERS

INPUT OFFSET VOLTAGE (µV)

1782 TA01a

25

20

15

10

5

0

VS = 5V, 0V
V

CM

= 2.5V

查询LT1781CS供应商

FEATURES

LT1782

Micropower, Over-The-Top

SOT-23, Rail-to-Rail

Input and Output Op Amp

U

DESCRIPTIO

■

Operates with Inputs Above V

■

Rail-to-Rail Input and Output

■

Micropower: 55µA Supply Current Max

■

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

■

Low Profile (1mm) ThinSOTTM Package

■

Low Input Offset Voltage: 800µV Max

■

Single Supply Input Range: 0V to 18V

■

High Output Current: 18mA Min

■

Specified on 3V, 5V and ±5V Supplies

■

Output Shutdown on 6-Lead Version

■

Reverse Battery Protection to 18V

■

High Voltage Gain: 1500V/mV

■

Gain Bandwidth Product: 200kHz

■

Slew Rate: 0.07V/µs

+

U

APPLICATIO S

■

Portable Instrumentation

■

Battery- or Solar-Powered Systems

■

Sensor Conditioning

■

Supply Current Sensing

■

Battery Monitoring

■

MUX Amplifiers

■

4mA to 20mA Transmitters

The LT®1782 is a 200kHz op amp available in the small
SOT-23 package that operates on all single and split
supplies with a total voltage of 2.5V to 18V. The amplifier
draws less than 55µA of quiescent current and has reverse
battery protection, drawing negligible current for reverse
supply voltages up to 18V.

The input range of the LT1782 includes ground, and a
unique feature of this device is its Over-The-TopTM opera­tion capability with either or both of its inputs above the
positive rail. The inputs handle 18V both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring even when the inputs are 9V
below the negative supply.

The LT1782 can drive loads up to 18mA and still maintain
rail-to-rail capability. A shutdown feature on the 6-lead
version can disable the part, making the output high
impedance and reducing quiescent current to 5µA. The
LT1782 op amp is available in the 5- and 6-lead
SOT-23 packages. For applications requiring higher speed,
refer to the LT1783.

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

ThinSOT and Over-The-Top are trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Positive Supply Rail Current Sense

+

V

5V TO 18V

200Ω

LOAD

0.2Ω

200Ω

I

LOAD

+

LT1782

–

U

Distribution of Input Offset Voltage

5V

MMBT3904

V
0V TO 4.3V

2k

OUT

1782 TA01

= 2Ω(I

LOAD

)

1

LT1782

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V+ to V–) .............................. 18V

Input Differential Voltage ........................................ 18V

Input Pin Voltage to V–............................... +24V/–10V

Shutdown Pin Voltage Above V–............................ 18V

Shutdown Pin Current ....................................... ±10mA

Output Short-Circuit Duration (Note 2)........... Indefinite

Operating Temperature Range (Note 3)

LT1782C............................................ –40°C to 85°C

LT1782I ............................................. –40°C to 85°C

LT1782H ......................................... – 40°C to 125°C

UU

W

PACKAGE/ORDER I FOR ATIO

ORDER PART

TOP VIEW

1

OUT

–

2

+IN

V

T

JMAX

+

3

S5 PACKAGE

5-LEAD PLASTIC SOT-23

= 150°C, θJA = 250°C/W

+

5

V

–

–IN

4

NUMBER

LT1782CS5
LT1782IS5
LT1782HS5

S5 PART MARKING

LTLD
LTLE
LTXK

Specified Temperature Range (Note 4)

LT1782C............................................ –40°C to 85°C

LT1782I ............................................. –40°C to 85°C

LT1782H ......................................... – 40°C to 125°C

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

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

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

ORDER PART

NUMBER

TOP VIEW

1

OUT

–

2

V

+IN

6-LEAD PLASTIC SOT-23

T

JMAX

+

3

S6 PACKAGE

= 150°C, θJA = 230°C/W

+

V

6

SHDN

5

–

–IN

4

LT1782CS6
LT1782IS6
LT1782HS6

S6 PART MARKING

LTIS
LTIT
LTXL

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

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V, VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

∆VOS/∆T Input Offset Voltage Drift (Note 7) ● 25µV/°C
I

OS

I

B

e

n

i

n

Input Offset Voltage TA = 25°C 400 800 µV

Input Offset Current ● 0.7 2 nA

Input Bias Current ● 815 nA

Input Bias Current Drift –40°C ≤ TA ≤ 85°C ● 0.01 nA/°C
Input Noise Voltage 0.1Hz to 10Hz 1 µV
Input Noise Voltage Density f = 1kHz 50 nV/√Hz
Input Noise Current Density f = 1kHz 0.05 pA/√Hz

= half supply, for the 6-lead part V

OUT

≤ 70°C ● 950 µV

0°C ≤ T

A

–40°C ≤ T

V

CM

V

CM

SHDN or V

≤ 85°C ● 1100 µV

A

= 18V (Note 5) ● 1 µA

= 18 (Note 5) ● 612 µA

= 0V, VCM = 0V to 18V 0.1 nA

S

= 0V, pulse power tested unless otherwise specified.

PIN5

LT1782C/LT1782I

P-P

2

LT1782

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V, VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

R

IN

C

IN

CMRR Common Mode Rejection Ratio VCM = 0V to VCC – 1V ● 90 100 dB

PSRR Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V ● 90 100 dB
A

VOL

V

OL

V

OH

I

SC

I

S

I

SHDN

V

L

V

H

t

ON

t

OFF

GBW Gain Bandwidth Product f = 5kHz 110 200 kHz

Input Resistance Differential ● 3.4 6.5 MΩ

Input Capacitance 5pF
Input Voltage Range ● 018V

(Note 5) V

Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k 200 1500 V/mV

Output Voltage Swing LOW No Load ● 38 mV

Output Voltage Swing HIGH VS = 3V, No Load ● 2.91 2.94 V

Short-Circuit Current (Note 2) VS = 3V, Short to GND 5 10 mA

Minimum Supply Voltage ● 2.7 V
Reverse Supply Voltage IS = –100µA ● 18 V
Supply Current 40 55 µA

(Note 6) 0°C ≤ T

Supply Current, SHDN V
Shutdown Pin Current V

Shutdown Output Leakage Current V
Maximum Shutdown Pin Current V
Shutdown Pin Input Low Voltage (Note 10) ● 0.3 V
Shutdown Pin Input High Voltage (Note 10) ● 2V
Turn-On Time V
Turn-Off Time V

(Note 5) 0°C ≤ T

= half supply, for the 6-lead part V

OUT

Common Mode, V
Common Mode, V

= 0V to 18V (Note 8) ● 68 80 dB

CM

= 3V, 0°C ≤ TA ≤ 70°C ● 133 V/mV

V

S

V

= 3V, –40°C ≤ TA ≤ 85°C ● 100 V/mV

S

= 0V to (VCC – 1V) 5 GΩ

CM

= 0V to 18V ● 1.5 3 MΩ

CM

VS = 5V, VO = 500mV to 4.5V, RL = 10k 400 1500 V/mV

= 5V, 0°C ≤ TA ≤ 70°C ● 250 V/mV

V

S

= 5V, –40°C ≤ TA ≤ 85°C ● 200 V/mV

V

S

I

= 5mA ● 200 500 mV

SINK

= 5V, I

V

S

= 3V, I

V

S

= 10mA ● 400 800 mV

SINK

= 5mA ● 2.6 2.8 V

SOURCE

VS = 5V, No Load ● 4.91 4.94 V

= 5V, I

V

S

V

= 3V, Short to V

S

= 10mA ● 4.5 4.74 V

SOURCE

CC

VS = 5V, Short to GND 15 30 mA

= 5V, Short to V

V

S

≤ 70°C ● 60 µA

A

–40°C ≤ T

= 2V, No Load (Note 10) ● 515 µA

PIN5

= 0.3V, No load (Note 10) ● 0.5 nA

PIN5

V

= 2V, No Load (Note 10) ● 28 µA

PIN5

= 5V, No Load (Note 10) ● 5 µA

V

PIN5

= 2V, No Load (Note 10) ● 0.05 1 µA

PIN5

= 18V, No Load (Note 10) ● 10 30 µA

PIN5

= 5V to 0V, RL = 10k (Note 10) 100 µs

PIN5

= 0V to 5V, RL = 10k (Note 10) 6 µs

PIN5

≤ 70°C ● 100 kHz

A

–40°C ≤ T

CC

≤ 85°C ● 65 µA

A

≤ 85°C ● 90 kHz

A

= 0V, pulse power tested unless otherwise specified.

PIN5

LT1782C/LT1782I

15 30 mA

20 40 mA

3

LT1782

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = 3V, 0V; VS = 5V, 0V, VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

SR Slew Rate AV = –1, RL = ∞ 0.035 0.07 V/µs

(Note 5) 0°C ≤ T

t

S

Settling Time VS = 5V, ∆V
THD Distortion VS = 3V, VO = 2V
FPBW Full-Power Bandwidth (Note 9) V

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = ±5V, VCM = 0V,V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

∆VOS/∆T Input Offset Voltage Drift (Note 7) ● 25µV/°C
I

OS

I

B

e

n

i

n

R

IN

C

IN

CMRR Common Mode Rejection Ratio VCM = –5V to 13V ● 68 80 dB
A

VOL

V

OL

V

OH

I

SC

PSRR Power Supply Rejection Ratio VS = ±1.5V to ±9V ● 90 100 dB
I

S

I

SHDN

Input Offset Voltage TA = 25°C 500 900 µV

Input Offset Current ● 0.7 2 nA

Input Bias Current ● 815 nA

Input Bias Current Drift ● 0.01 nA/°C

Input Noise Voltage 0.1Hz to 10Hz 1 µV

Input Noise Voltage Density f = 1kHz 50 nV/√Hz

Input Noise Current Density f = 1kHz 0.05 pA/√Hz

Input Resistance Differential ● 3.4 6.5 MΩ

Input Capacitance 5pF

Input Voltage Range ● –5 13 V

Large-Signal Voltage Gain VO = ±4V, RL= 10k 55 150 V/mV

Output Voltage Swing LOW No Load ● –4.997 –4.992 V

Output Voltage Swing HIGH No Load ● 4.91 4.94 V

Short-Circuit Current (Note 2) Short to GND 18 30 mA

Supply Current 45 60 µA

Supply Current, SHDN V

Shutdown Pin Current V

= 0V, for the 6-lead part V

OUT

= half supply, for the 6-lead part V

OUT

≤ 70°C ● 0.031 V/µs

A

–40°C ≤ T

OUT

0°C ≤ T
–40°C ≤ T

Common Mode, V

0°C ≤ T
–40°C ≤ T

I

SINK

I

SINK

I

SOURCE

I

SOURCE

0°C ≤ T

0°C ≤ T
–40°C ≤ T

PIN5

PIN5

V

PIN5

≤ 85°C ● 0.028 V/µs

A

= 2V to 0.1%, AV = –1 45 µs

OUT

, AV = 1, RL = 10k, f =1kHz 0.003 %

P–P

= 2V

P–P

= V–, pulse power tested unless otherwise specified.

PIN5

≤ 70°C ● 1050 µV

A

≤ 85°C ● 1200 µV

A

= –5V to 13V ● 1.5 3 MΩ

CM

≤ 70°C ● 40 V/mV

A

≤ 85°C ● 30 V/mV

A

= 5mA ● –4.8 –4.5 V
= 10mA ● –4.6 –4.2 V

= 5mA ● 4.6 4.8 V
= 10mA ● 4.5 4.74 V

≤ 70°C ● 15 mA

A

≤ 70°C ● 65 µA

A

≤ 85°C ● 70 µA

A

= –3V, VS = ±5V, No Load (Note 10) ● 620 µA
= –4.7V, VS = ±5V, No load (Note 10) ● 0.5 nA

= –3V, VS = ±5V, No Load (Note 10) ● 28 µA

= 0V, pulse power tested unless otherwise specified.

PIN5

LT1782C/LT1782I

11 kHz

LT1782C/LT1782I

P-P

4

LT1782

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C.
VS = ±5V, VCM = 0V,V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Maximum Shutdown Pin Current V

Shutdown Output Leakage Current V
V

L

V

H

t

ON

t

OFF

GBW Gain Bandwidth Product f = 5kHz 120 225 kHz

SR Slew Rate AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0.0375 0.075 V/µs

t

S

FPBW Full-Power Bandwidth (Note 9) V

Shutdown Pin Input Low Voltage VS = ±5V (Note 10) ● –4.7 V

Shutdown Pin Input High Voltage VS = ±5V (Note 10) ● –3 V

Turn-On Time V

Turn-Off Time V

Settling Time ∆V

= 0V, for the 6-lead part V

OUT

PIN5

PIN5

PIN5

PIN5

0°C ≤ T
–40°C ≤ T

0°C ≤ T
–40°C ≤ T

OUT

= V–, pulse power tested unless otherwise specified.

PIN5

LT1782C/LT1782I

= 9V, VS = ±9V (Note 10) ● 10 30 µA
= –7V, VS = ±9V, No Load (Note 10) ● 0.05 1 µA

= 0V to –5V, RL = 10k (Note 10) ● 100 µs
= –5V to 0V, RL = 10k (Note 10) ● 6 µs

≤ 70°C ● 110 kHz

A

≤ 85°C ● 100 kHz

A

≤ 70°C ● 0.033 V/µs

A

≤ 85°C ● 0.030 V/µs

A

= 4V to 0.1%, AV = 1 50 µs

OUT

= 8V

P–P

3 kHz

The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V;
VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

∆VOS/∆T Input Offset Voltage Drift ● 15 µV/°C
I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = 0.3V to VCC – 1V ● 76 dB

A

VOL

V

OL

V

OH

PSRR Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V ● 80 dB

= half supply, for the 6-lead part V

OUT

= 0V, pulse power tested unless otherwise specified. (Note 4)

PIN5

LT1782H

Input Offset Voltage 400 800 µV

● 3mV

Input Offset Current ● 3nA

= 18V (Note 5) ● 2 µA

V

CM

Input Bias Current ● 30 nA

= 18V (Note 5) ● 25 µA

V

CM

Input Voltage Range ● 0.3 18 V

= 0.3V to 18V ● 60 dB

V

CM

Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k 200 1500 V/mV

● 50 V/mV

VS = 5V, VO = 500mV to 4.5V, RL = 10k 400 1500 V/mV

● 80 V/mV

Output Voltage Swing LOW No Load ● 15 mV

= 5mA ● 900 mV

I

SINK

= 5V, I

V

S

= 10mA ● 1500 mV

SINK

Output Voltage Swing HIGH VS = 3V, No Load ● 2.85 V

V

= 3V, I

S

= 5mA ● 2.20 V

SOURCE

VS = 5V, No Load ● 4.85 V

= 5V, I

V

S

= 10mA ● 3.80 V

SOURCE

Minimum Supply Voltage ● 2.7 V

Reverse Supply Voltage IS = –100µA ● 18 V

5

LT1782

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V;
VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

I

S

I

SHDN

V

L

V

H

GBW Gain Bandwidth Product f = 10kHz (Note 5) 110 200 kHz

SR Slew Rate AV = –1, RL = ∞ (Note 7) 0.035 0.07 V/µs

The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C.
VS = ±5V, VCM = 0V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

∆VOS/∆T Input Offset Voltage Drift (Note 9) ● 15 µV/°C
I

OS

I

B

CMRR Common Mode Rejection Ratio VCM = –4.7V to 13V ● 60 dB
A

VOL

V

O

PSRR Power Supply Rejection Ratio VS = ±1.5V to ±9V ● 80 dB

I

S

I

SHDN

V

L

V

H

GBW Gain Bandwidth Product f = 5kHz 120 225 kHz

SR Slew Rate AV = –1, RL = ∞, VO = ±4V 0.0375 0.075 V/µs

= half supply, for the 6-lead part V

OUT

= 0V, pulse power tested unless otherwise specified. (Note 4)

PIN5

LT1782H

Supply Current 40 55 µA

● 100 µA

Supply Current, SHDN V

Shutdown Pin Current V

Output Leakage Current V

Maximum Shutdown Pin Current V

= 2V, No Load (Note 10) ● 25 µA

PIN5

= 0.3V, No load (Note 10) ● 0.5 nA

PIN5

V

= 2V, No Load (Note 10) ● 12 µA

PIN5

= 2V, No Load (Note 10) ● 3 µA

PIN5

= 18V, No Load ● 45 µA

PIN5

Shutdown Pin Input Low Voltage (Note 10) ● 0.3 V

Shutdown Pin Input High Voltage (Note 10) ● 2V

● 65 kHz

● 0.020 V/µs

= 0V, for the 6-lead part V

OUT

= V–, pulse power tested unless otherwise specified. (Note 4)

PIN5

LT1782H

Input Offset Voltage 500 900 µV

● 3.2 mV

Input Offset Current ● 3nA

Input Bias Current ● 30 nA

Large-Signal Voltage Gain VS = ±4V, RL = 10k 55 150 V/mV

● 20 V/mV

Output Voltage Swing No Load ● ±4.85 V

I

= ±5mA ● ±4.10 V

SINK

I

= ±10mA ● ±3.50 V

SINK

Minimum Supply Voltage ● ±1.35 V

Supply Current 45 60 µA

● 110 µA

Supply Current, SHDN V

Shutdown Pin Current V

Maximum Shutdown Pin Current V

Output Leakage Current V

= –3V, VS = ±5V, No Load (Note 10) ● 25 µA

PIN5

= –4.7V, VS = ±5V, No load (Note 10) ● 0.5 nA

PIN5

V

= –3V, VS = ±5V, No Load (Note 10) ● 12 µA

PIN5

= 9V, VS = ±9V, No Load (Note 10) ● 45 µA

PIN5

= –7V, VS = ±9V, No Load ● 3 µA

PIN5

Shutdown Pin Input Low Voltage VS = ±5V ● –4.7 V

Shutdown Pin Input High Voltage VS = ±5V ● –3 V

● 70 kHz

Measured at V

= ±2V ● 0.0220 V/µs

O

6

ELECTRICAL CHARACTERISTICS

LT1782

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

Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum.

Note 3: The LT1782C and LT1782I are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LT1782H is
guaranteed functional over the operating temperature range of
–40°C to 125°C.

Note 4: The LT1782C is guaranteed to meet specified performance from
0°C to 70°C. The LT1782C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1782I is guaranteed to meet
specified performance from –40°C to 85°C. The LT1782H is guaranteed to

Note 5: V
V

S

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

S

Note 7: Guaranteed by correlation to slew rate at VS = ±5V, and GBW at
V

S

Note 8: This specification implies a typical input offset voltage of 1.8mV at
V

CM

Note 9: This parameter is not 100% tested.
Note 10: Specifications apply to 6-lead SOT-23 with shutdown.
Note 11: Full-power bandwidth is calculated for the slew rate.

FPBW = SR/2πVP.

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

S

= ±5V or VS = ±9V tests.

= ±5V or VS = ±9V tests.

= 3V and VS = ±5V tests.

= 18V and a maximum input offset voltage of 7.2mV at VCM = 18V.

meet specified performance from –40°C to 125°C.

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current vs Supply Voltage

50

45

40

35

30

SUPPLY CURRENT (µA)

25

20

2

TA = 125°C

TA = 25°C

TA = –55°C

6 10 144 8 12 16 18

SUPPLY VOLTAGE (V)

1782 G01

Minimum Supply Voltage

400

300

200

100

0

TA = 125°C

0

1 2 3 4 5

TOTAL SUPPLY VOLTAGE (V)

INPUT OFFSET VOLTAGE CHANGE (µV)

–100

–200

–300

–400

TA = –55°C

TA = 25°C

1782 G02

Output Voltage vs Large Input
Voltage

5

VS = 5V, 0V

4

3

(V)

OUT

V

2

V

IN

1

0

–6 –4 0 2–2 4

–8 6 8 10 12 14 16 18

–10

VIN (V)

5V
+
–

1782 G02a

7

LT1782

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Input Bias Current vs Common
Mode Voltage

6000

VS = 5V, 0V

5000
4000
3000
2000
1000

40
30
20

INPUT BIAS CURRENT (nA)

10

0

–10

4.2 4.4 4.6 4.8 5 5.2 5.4 15 16 18

3.8 4

TA = 125°C

COMMON MODE VOLTAGE (V)

Output Saturation Voltage vs
Input Overdrive

100

OUTPUT HIGH

10

OUTPUT LOW

VS = ±2.5V

OUTPUT SATURATION VOLTAGE (mV)

NO LOAD

1

0

10 20 30 40 50 60

INPUT OVERDRIVE (mV)

TA = 25°C

TA = –55°C

1782 G03

1782 G06

Output Saturation Voltage vs Load
Current (Output High)

1

VS = ±2.5V
V

= 30mV

OD

TA = 125°C

0.1
TA = 25°C

OUTPUT SATURATION VOLTAGE (V)

0.01

1µ

SOURCING LOAD CURRENT (A)

100µ10µ 1m 10m

TA = –55°C

Output Short-Circuit Current vs
Temperature

40

VS = ±5V

35

30

SOURCING CURRENT

25

OUTPUT CURRENT (mA)

20

15

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

SINKING CURRENT

1782 G04

1782 G06a

Output Saturation Voltage vs Load
Current (Output Low)

1

VS = ±2.5V

= 30mV

V

OD

0.1

TA = 25°C

0.01

OUTPUT SATURATION VOLTAGE (V)

0.001

1µ 1µ 1m 10m

10µ

SINKING LOAD CURRENT (A)

TA = 125°C

0.1Hz to 10Hz Noise Voltage

VS = ±2.5V

NOISE VOLTAGE (400nV/DIV)

012345678910

TIME (sec)

TA = –55°C

1782 G05

1782 G07

Noise Voltage Density vs
Frequency

80

70

60

50

40

30

INPUT NOISE VOLTAGE DENSITY (nV/√Hz)

20

1 100 1k 10k

10

FREQUENCY (Hz)

8

1782 G08

Input Noise Current vs Frequency

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

INPUT NOISE CURRENT DENSITY (pA/√Hz)

0

1 100 1k 10k

10

FREQUENCY (Hz)

VS = ±2.5V

1782 G09

Gain and Phase Shift vs
Frequency

70
60
50
40
30
20

GAIN (dB)

10

0
–10
–20
–30

1k

10k 100k 1M

FREQUENCY (Hz)

PHASE

GAIN

VS = ±2.5V

1782 G10

100
80
60

PHASE SHIFT (DEG)

40
20
0
–20
–40
–60
–80
–100

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LT1782

Gain Bandwidth Product vs
Temperature

230

f = 5kHz

= ±2.5V

V

S

220

210

200

190

GAIN BANDWIDTH (kHz)

180

170

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

1782 G11

Slew Rate vs Temperature

0.11
VS = ±2.5V

0.10

0.09

0.08

0.07

SLEW RATE (V/µs)

0.06

0.05

0.04

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

Gain Bandwidth Product and
Phase Margin vs Load Resistance PSRR vs Frequency

PHASE MARGIN (DEG)

90

VS = ±2.5V

80
70
60
50
40
30
20
10

NEGATIVE SUPPLY

0

POWER SUPPLY REJECTION RATIO (dB)

–10

1k

PHASE MARGIN

VS = ±2.5V

= –1

A

V

250

200

150

100

GAIN BANDWIDTH PRODUCT (kHz)

= RG = 10k

R

F

f = 5kHz

GAIN BANDWIDTH PRODUCT

50

1k

10k 100k

LOAD RESISTANCE (Ω)

70

60

50

1782 G14

RISING

FALLING

1782 G12

POSITIVE SUPPLY

10k 100k 1M

FREQUENCY (Hz)

1782 G15

Gain Bandwidth Product and
Phase Margin vs Supply Voltage

PHASE MARGIN

240

220

200

AV = –1

180

R
f = 5kHz

160

GAIN BAINDWIDTH PRODUCT (kHz)

0

GAIN BANDWIDTH PRODUCT

= RG = 10k

F

2 4 6 8 10 12 14 16 18

TOTAL SUPPLY VOLTAGE (V)

CMRR vs Frequency

110

100

90

80

70

60

50

40

COMMON MODE REJECTION RATIO (dB)

30

1k

10k 100k

FREQUENCY (Hz)

1782 G13

VS = ±2.5V

1782 G16

PHASE MARGIN (DEG)

60

55

50

Output Impedance vs Frequency

10k

VS = ±2.5V

AV = 100

1k

100

OUTPUT IMPEDANCE (Ω)

0.1

AV = 10

10

AV = 1

1

100

10k1k 100k 1M

FREQUENCY (Hz)

1782 G17

Disabled Output Impedance vs
Frequency (Note 8)

1M

VS = ±2.5V

(SHUTDOWN) = 2.5V

V

PIN5

100k

10k

1k

OUTPUT IMPEDANCE (Ω)

100

100

1k 10k 100k 1M

FREQUENCY (Hz)

1782 G17a

Settling Time to 0.1% vs Output
Step

4

3

AV = 1 AV = –1

2

1

VS = ±5V

0

–1

OUTPUT STEP (V)

–2

–3

–4

25 30 35 40 50 60 70 80

AV = 1 AV = –1

SETTLING TIME (µs)

1782 G18

9

LT1782

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Capacitive Load Handling
Overshoot vs Capacitive Load

40

VS = 5V, 0V

35

30

25

20

15

OVERSHOOT (%)

10

= 2.5V

V

CM

AV = 1

AV = 5

5

0

10

100 1000 10000

CAPACITIVE LOAD (pF)

AV = 10

Total Harmonic Distortion + Noise
vs Load Resistance

10

VS = 3V TOTAL

= 1

A

V

= 2V

V

1

0.1

THD + NOISE (%)

0.01

0.001
100 100k

AT 1kHz

IN

P-P

VS = ±1.5V

= ±1V

V

IN

VS = 3V, 0V
V

= 0.5V TO 2.5V

IN

VS = 3V, 0V

= 0.2V TO 2.2V

V

IN

1k 10k

LOAD RESISTANCE TO GROUND (Ω)

1782 G19

1782 G22

Undistorted Output Swing vs
Frequency

12

10

)

P-P

8

6

4

OUTPUT SWING (V

2

0

100 1k 10k 100k

VS = ±5V

VS = ±1.5V

FREQUENCY (Hz)

DISTORTION ≤ 1%

A

= 1

V

1782 G20

Total Harmonic Distortion + Noise
vs Output Voltage Amplitude

10

f = 1kHz, RL = 10k

= 0V

AV = –1, RF = RG = 100k

= ±1.5V

V

S

V

= 0V

CM

AV = –1, RF = RG = 100k

= 3V, 0V

V

S

= 1.5V

V

CM

P-P

1782 G23

)

AV = 1

1

0.1

THD + NOISE (%)

0.01

0.001

= ±1.5V

V

S

V

CM

AV = 1

= 3V. 0V

V

S

= 1.5V

V

CM

0123

OUTPUT VOLTAGE AMPLITUDE (V

Total Harmonic Distortion + Noise
vs Frequency

1

VS = 3V, 0V
V

= 2V

OUT

P-P

VCM = 1.2V
R

= 10k

L

0.1

0.010

THD + NOISE (%)

0.001

AV = –1
R

= RG = 100k

F

AV = 1

10 1k 10k

100

FREQUENCY (Hz)

Open-Loop Gain

RL = 10k

RL = 50k

RL = 2k

INPUT OFFSET VOLTAGE CHANGE (50µV/DIV)

–5 –4 –3 –2 –1 0 1 2 3 456

–6

OUTPUT VOLTAGE (V)

1782 G21

VS = ±5V

1782 G24

Supply Current vs Shutdown
Voltage

50

TA = 125°C

40

TA = 25°C

30

TA = –55°C

20

SUPPLY CURRENT (µA)

10

0

0 0.5 1 1.5 2 2.5

SHUTDOWN PIN VOLTAGE (V)

10

VS = 5V, 0V

1782 G25

Large-Signal Response

VS = ±5V 1782 G26
AV = 1

= 15pF

C

L

Small-Signal Response

= ±5V 1782 G27

V

S

AV = 1

= 15pF

C

L

WUUU

APPLICATIO S I FOR ATIO

LT1782

Supply Voltage

The positive supply pin of the LT1782 should be bypassed
with a small capacitor (typically 0.1µF) within an inch of
the pin. When driving heavy loads, an additional 4.7µF
electrolytic capacitor should be used. When using split
supplies, the same is true for the negative supply pin.

The LT1782 is protected against reverse battery voltages
up to 18V. In the event a reverse battery condition occurs,
the supply current is typically less than 1nA.

Inputs

The LT1782 has two input stages, NPN and PNP (see the
Simplified Schematic), resulting in three distinct operat­ing regions as shown in the Input Bias Current vs Common
Mode typical performance curve.

For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–8nA. When the input common mode voltage is within

0.5V of the positive rail, the NPN stage is operating and the
input bias current is typically 15nA. Increases in tempera­ture will cause the voltage at which operation switches
from the PNP input stage to the NPN input stage to move
towards V+. The input offset voltage of the NPN stage is
untrimmed and is typically 1.8mV.

A Schottky diode in the collector of the input NPN transis­tors, along with special geometries for these NPN transis­tors, allows the LT1782 to operate with either or both of its
inputs above V+. At about 0.3V above V+, the NPN input
transistor is fully saturated and the input bias current is
typically 4µA at room temperature. The input offset volt-
age is typically 1.8mV when operating above V+. The
LT1782 will operate with its inputs 18V above V– regard­less of V+.

The inputs are protected against excursions as much as
10V below V– by an internal 6k resistor in series with each
input and a diode from the input to the negative supply.
The input stage of the LT1782 incorporates phase reversal
protection to prevent the output from phase reversing for
inputs up to 9V below V–. There are no clamping diodes
between the inputs and the maximum differential input
voltage is 18V.

Output

The output of the LT1782 can swing to within 60mV of the
positive rail with no load and within 3mV of the negative
rail with no load. When monitoring voltages within 60mV
of the positive rail or within 3mV of the negative rail, gain
should be taken to keep the output from clipping. The
LT1782 can sink and source over 30mA at ±5V supplies,
sourcing current is reduced to 10mA at 3V total supplies
as noted in the Electrical Characteristics.

The LT1782 is internally compensated to drive at least
600pF of capacitance under any output loading condi­tions. A 0.22µF capacitor in series with a 150Ω resistor
between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 10,000pF, at all
output currents.

Distortion

There are two main contributors to distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current, and distortion caused by
nonlinear common mode rejection. If the op amp is
operating inverting, there is no common mode induced
distortion. If the op amp is operating in the PNP input stage
(input is not within 0.8V of V+), the CMRR is very good,

11

LT1782

WUUU

APPLICATIO S I FOR ATIO

typically 100dB. When the LT1782 switches between
input stages, there is significant nonlinearity in the CMRR.
Lower load resistance increases the output crossover
distortion but has no effect on the input stage transition
distortion. For lowest distortion, the LT1782 should be
operated single supply, with the output always sourcing
current and with the input voltage swing between ground
and (V+ – 0.8V). See the Typical Performance Character­istics curves, “Total Harmonic Distortion + Noise vs Ouput
Voltage Amplitude.”

Gain

The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes perfor-

WW

SI PLIFIED SCHE ATIC

mance in single supply applications where the load is
returned to ground. The typical performance curve of
open-loop gain for various loads shows the details.

Shutdown

The 6-lead part includes a shutdown feature that disables
the part, reducing quiescent current and making the output
high impedance. The part can be shut down by bringing the
SHDN pin 1.2V or more above V–. When shut down, the
supply current is about 5µA and the output leakage current
is less than 1µA (V– ≤ V

≤ V+). In normal operation, the

OUT

SHDN pin can be tied to V– or left floating. See the Typical
Performance Characteristics curves, “Supply Current vs
Shutdown Pin Voltage.”

SHDN

J1

Q26

+

Q22

Q21

1782 SS

V

OUT

V

–

Q1

D1

R1
30k

Q4

–IN

+

2µA

Q23 Q24Q25

+IN

Q5

R2
6k

Q7

R3
6k

D5

Q6

D4

Q8

Q9

Q10

Q2

Q11 Q12

Q13 Q14

R4
40k

R5
40k

Q15

Q3

D3

Q19

Q17 Q20

Q16 Q18

12

TYPICAL APPLICATIO S

LT1782

U

Protected Fault Conditions

–18V

+

V

LT1782

24V

REVERSE BATTERY INPUT OVERVOLTAGE

5V

+

18V

INPUT DIFFERENTIAL VOLTAGE INPUT BELOW GROUND

LT1782 LT1782

10V

+

5VOK! OK!

LT1782

+

5VOK! OK!

1782 TA03

Compact, High Output Current, Low Dropout, Precision 2.5V Supply

V

S

2.8V to 3.3V

680Ω
5%

100k
5%

LT1790-2.5

SUPPLY CURRENT ≅ 120µA, NO LOAD

22Ω
5%

+

LT1782

5%

1k

–

0.1µF

1µF

I

= 0mA TO 300mA

LOAD

NOTE: NOT CURRENT LIMITED

VISHAY
SILICONIX
Si3445DV

1782 TA04

V

OUT

2.5V

13

LT1782

PACKAGE DESCRIPTIO

U

S5 Package

5-Lead Plastic SOT-23

(LTC DWG # 05-08-1633)
(LTC DWG # 05-08-1635)

2.80 – 3.10

(.110 – .118)

(NOTE 3)

SOT-23

(Original)

.90 – 1.45

A

(.035 – .057)

.00 – .15

A1

(.00 – .006)

.90 – 1.30

A2

(.035 – .051)

.35 – .55

L

(.014 – .021)

.20

(.008)

DATUM ‘A’

L

NOTE:

1. CONTROLLING DIMENSION: MILLIMETERS

2. DIMENSIONS ARE IN

3. DRAWING NOT TO SCALE

4. DIMENSIONS ARE INCLUSIVE OF PLATING

5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

6. MOLD FLASH SHALL NOT EXCEED .254mm

7. PACKAGE EIAJ REFERENCE IS:
SC-74A (EIAJ) FOR ORIGINAL
JEDEL MO-193 FOR THIN

SOT-23

(ThinSOT)

1.00 MAX

(.039 MAX)

.01 – .10

(.0004 – .004)

.80 – .90

(.031 – .035)
.30 – .50 REF

(.012 – .019 REF)

MILLIMETERS

(INCHES)

2.60 – 3.00

(.102 – .118)

.09 – .20

(.004 – .008)

(NOTE 2)

1.50 – 1.75

(.059 – .069)

(NOTE 3)

PIN ONE

A

.95

(.037)

REF

A2

1.90

(.074)

REF

.25 – .50

(.010 – .020)

(5PLCS, NOTE 2)

A1

S5 SOT-23 0401

14

PACKAGE DESCRIPTIO

U

S6 Package

6-Lead Plastic SOT-23

(LTC DWG # 05-08-1634)
(LTC DWG # 05-08-1636)

2.80 – 3.10

(.110 – .118)

(NOTE 3)

LT1782

SOT-23

(Original)

.90 – 1.45

A

(.035 – .057)

.00 – 0.15

A1

(.00 – .006)

.90 – 1.30

A2

(.035 – .051)

.35 – .55

L

(.014 – .021)

.20

(.008)

DATUM ‘A’

L

NOTE:

1. CONTROLLING DIMENSION: MILLIMETERS

2. DIMENSIONS ARE IN

3. DRAWING NOT TO SCALE

4. DIMENSIONS ARE INCLUSIVE OF PLATING

5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

6. MOLD FLASH SHALL NOT EXCEED .254mm

7. PACKAGE EIAJ REFERENCE IS:
SC-74A (EIAJ) FOR ORIGINAL
JEDEL MO-193 FOR THIN

SOT-23

(ThinSOT)

1.00 MAX

(.039 MAX)

.01 – .10

(.0004 – .004)

.80 – .90

(.031 – .035)
.30 – .50 REF

(.012 – .019 REF)

MILLIMETERS

(INCHES)

2.60 – 3.00

(.102 – .118)

.09 – .20

(.004 – .008)

(NOTE 2)

1.50 – 1.75

(.059 – .069)

(NOTE 3)

A

PIN ONE ID

.95

(.037)

REF

A2

1.90

(.074)

REF

.25 – .50

(.010 – .020)

(6PLCS, NOTE 2)

A1

S6 SOT-23 0401

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

LT1782

TYPICAL APPLICATIO S

U

Current Source

V

CC

LT1634-1.25

R1

+

I

OUT

2N3906

1.25V

=

R1

1782 TA02

LT1782

–

Programmable Gain, AV = 2, AV = 20, 100kHz Amplifier Programmable Gain Amplifier Frequency Response

30
25
20
15
10

5

GAIN (dB)

0

–5
–10
–15
–20

1k 100k 1M 10M

AV = 20

AV = 2

10k

FREQUENCY (Hz)

1782 TA05b

IN

9.09k

V

CC

AV = 2AV = 20

SHDN

V

CC

+

SHDN

V

CC

+

LT1782

–

V

EE

R2

R1

10k

LT1784

–

V

EE

R1 + R2

AV = 1+

()

R3

OR 1+

R1

()

R2 + R3

OUT

R3

1k

1782 TA05a

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Linear Technology Corporation

16

1630 McCarthy Blvd., Milpitas, CA 95035-7417

[phone] ● FAX: [phone]

●

www.linear.com

, MSOP Package, Shutdown Function

CC

1782fa LT/TP 0501 1.5K REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1999