FEATURES

n Operates with Inputs Above V+

n Rail-to-Rail Input and Output

n Micropower: 55µA Supply Current Max

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

n Low Profile (1mm) ThinSOT™ Package n Low Input Offset Voltage: 800µV Max n Single Supply Input Range: 0V to 18V n High Output Current: 18mA Min

n Specified on 3V, 5V and ±5V Supplies n Output Shutdown on 6-Lead Version n Reverse Battery Protection to 18V

n High Voltage Gain: 1500V/mV

n Gain Bandwidth Product: 200kHz

n Slew Rate: 0.07V/µs


APPLICATIONS

n Portable Instrumentation

n Battery- or Solar-Powered Systems

n Sensor Conditioning

n Supply Current Sensing

n Battery Monitoring

n MUX Amplifiers

n 4mA to 20mA Transmitters


TYPICAL APPLICATION

Positive Supply Rail Current Sense

V+

5V TO 18V

200Q

5V

LT1782

Micropower, Over-The-Top

SOT-23, Rail-to-Rail Input and Output Op Amp DESCRIPTION

The LT®1782 is a 200kHz op amp available in the small SOT-23 package that operates on all single and split sup- plies 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-Top™ opera- tion 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.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and Over-The-Top are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.


Distribution of Input Offset Voltage

25 VS = 5V, 0V

VCM = 2.5V

PERCENTAGE OF AMPLIFIERS

20


15

0.2Q


200Q


LOAD

ILOAD

+

LT1782


MMBT3904

VOUT = 2Q(ILOAD) 0V TO 4.3V

2k


1782 TA01a


10


5


0

–900 –600 –300 0 300 600 900

INPUT OFFSET VOLTAGE (µV)

1782 TA01b


ABSOLUTE MAXIMUM RATINGS


(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

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


+

+ –

PIN CONFIGURATION


TOP VIEW

TOP VIEW

OUT 1 5 V+

OUT 1 6 V+

V2

V2 5 SHDN

+IN 3 4 –IN

+IN 3 4 –IN

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

TJMAX = 150°C, JA = 250°C/W

TJMAX = 150°C, JA = 230°C/W


ORDER INFORMATION


LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

SPECIFIED TEMPERATURE RANGE

LT1782CS5#PBF

LT1782CS5#TRPBF

LTLD

5-Lead Plastic TSOT-23

0°C to 70°C

LT1782IS5#PBF

LT1782IS5#TRPBF

LTLE

5-Lead Plastic TSOT-23

–40°C to 85°C

LT1782HS5#PBF

LT1782HS5#TRPBF

LTXK

5-Lead Plastic TSOT-23

–40°C to 125°C

LT1782CS6#PBF

LT1782CS6#TRPBF

LTIS

6-Lead Plastic TSOT-23

0°C to 70°C

LT1782IS6#PBF

LT1782IS6#TRPBF

LTIT

6-Lead Plastic TSOT-23

–40°C to 85°C

LT1782HS6#PBF

LT1782HS6#TRPBF

LTXL

6-Lead Plastic TSOT-23

–40°C to 125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified.


SYMBOL


PARAMETER


CONDITIONS

LT1782C/LT1782I

MIN TYP MAX


UNITS

VOS

Input Offset Voltage

TA = 25°C

0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l


400

800

950

1100

µV

µV

µV

VOS/T

Input Offset Voltage Drift (Note 7)


l


2

5

µV/°C

IOS

Input Offset Current


VCM = 18V (Note 5)

l l

0.7 2

1

nA

µA

IB

Input Bias Current


VCM = 18 (Note 5)

SHDN or VS = 0V, VCM = 0V to 18V

l l


8

6

0.1

15

12

nA

µA nA


Input Bias Current Drift

–40°C ≤ TA ≤ 85°C

l

0.01

nA/°C


Input Noise Voltage

0.1Hz to 10Hz


1

µVP-P

en

Input Noise Voltage Density

f = 1kHz


50

nV/√Hz

in

Input Noise Current Density

f = 1kHz


0.05

pA/√Hz

RIN

Input Resistance

Differential

Common Mode, VCM = 0V to (VCC – 1V) Common Mode, VCM = 0V to 18V

l


l

3.4 6.5

5

1.5 3

MΩ GΩ MΩ

CIN

Input Capacitance



5

pF


Input Voltage Range


l

0


18

V

CMRR

Common Mode Rejection Ratio (Note 5)

VCM = 0V to VCC – 1V VCM = 0V to 18V (Note 8)

l l

90

68

100

80


dB dB

PSRR

Power Supply Rejection Ratio

VS = 3V to 12.5V, VCM = VO = 1V

l

90

100


dB

AVOL

Large-Signal Voltage Gain

VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C

VS = 3V, –40°C ≤ TA ≤ 85°C


l l

200

133

100

1500


V/mV V/mV V/mV



VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C

VS = 5V, –40°C ≤ TA ≤ 85°C


l l

400

250

200

500


V/mV V/mV V/mV

VOL

Output Voltage Swing LOW

No Load ISINK = 5mA

VS = 5V, ISINK = 10mA

l l l


3

200

400

8

500

800

mV mV mV

VOH

Output Voltage Swing HIGH

VS = 3V, No Load

VS = 3V, ISOURCE = 5mA

l l

2.91

2.6

2.94

2.8


V V



VS = 5V, No Load

VS = 5V, ISOURCE = 10mA

l l

4.91

4.5

4.94

4.74


V V

ISC

Short-Circuit Current (Note 2)

VS = 3V, Short to GND VS = 3V, Short to VCC


5

15

10

30


mA mA



VS = 5V, Short to GND VS = 5V, Short to VCC


15

20

30

40


mA mA


Minimum Supply Voltage


l

2.7

V


Reverse Supply Voltage

IS = –100µA

l

18

V

IS

Supply Current (Note 6)


0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l


40

55

60

65

µA

µA

µA


Supply Current, SHDN

VPIN5 = 2V, No Load (Note 10)

l


5

15

µA

temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified.


SYMBOL


PARAMETER


CONDITIONS

LT1782C/LT1782I

MIN TYP MAX


UNITS

ISHDN

Shutdown Pin Current

VPIN5 = 0.3V, No Load (Note 10)

VPIN5 = 2V, No Load (Note 10)

VPIN5 = 5V, No Load (Note 10)

l l l


0.5

2

5


8

nA

µA

µA


Shutdown Output Leakage Current

VPIN5 = 2V, No Load (Note 10)

l

0.05 1

µA


Maximum Shutdown Pin Current

VPIN5 = 18V, No Load (Note 10)

l


10

30

µA

VL

Shutdown Pin Input Low Voltage

(Note 10)

l

0.3

V

VH

Shutdown Pin Input High Voltage

(Note 10)

l

2

V

tON

Turn-On Time

VPIN5 = 5V to 0V, RL = 10k (Note 10)


100

µs

tOFF

Turn-Off Time

VPIN5 = 0V to 5V, RL = 10k (Note 10)


6

µs

GBW

Gain Bandwidth Product (Note 5)

f = 5kHz

0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l

110

100

90

200


kHz kHz kHz

SR

Slew Rate (Note 5)

AV = –1, RL = ∞ 0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l

0.035

0.031

0.028

0.07


V/µs V/µs V/µs

tS

Settling Time

VS = 5V, VOUT = 2V to 0.1%, AV = –1


45

µs

THD

Distortion

VS = 3V, VO = 2VP-P, AV = 1, RL = 10k, f = 1kHz


0.003

%

FPBW

Full-Power Bandwidth (Note 9)

VOUT = 2VP-P


11

kHz


The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V, pulse power tested unless otherwise specified.



SYMBOL


PARAMETER


CONDITIONS

LT1782C/LT1782I

MIN TYP MAX


UNITS

VOS

Input Offset Voltage

TA = 25°C

0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l

500 900

1050

1200

µV

µV

µV

VOS/T

Input Offset Voltage Drift (Note 7)


l

2 5

µV/°C

IOS

Input Offset Current


l

0.7 2

nA

IB

Input Bias Current


l

8 15

nA


Input Bias Current Drift


l

0.01

nA/°C


Input Noise Voltage

0.1Hz to 10Hz


1

µVP-P

en

Input Noise Voltage Density

f = 1kHz


50

nV/√Hz

in

Input Noise Current Density

f = 1kHz


0.05

pA/√Hz

RIN

Input Resistance

Differential

Common Mode, VCM = –5V to 13V

l l

3.4 6.5

1.5 3

MΩ MΩ

CIN

Input Capacitance



5

pF


Input Voltage Range


l

–5 13

V

CMRR

Common Mode Rejection Ratio

VCM = –5V to 13V

l

68 80

dB

AVOL

Large-Signal Voltage Gain

VO = ±4V, RL = 10k 0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l

55 150

40

30

V/mV V/mV V/mV

temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V, pulse power tested unless otherwise specified.



SYMBOL


PARAMETER


CONDITIONS

LT1782C/LT1782I

MIN TYP MAX


UNITS

VOL

Output Voltage Swing LOW

No Load ISINK = 5mA ISINK = 10mA

l l l


–4.997

–4.8

–4.6

–4.992

–4.5

–4.2

V V V

VOH

Output Voltage Swing HIGH

No Load ISINK = 5mA ISINK = 10mA

l l l

4.91

4.6

4.5

4.94

4.8

4.74


V V V

ISC

Short-Circuit Current (Note 2)

Short to GND 0°C ≤ TA ≤ 70°C


l

18

15

30


mA mA

PSRR

Power Supply Rejection Ratio

VS = ±1.5V to ±9V

l

90

100


dB

IS

Supply Current


0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l


45

60

65

70

µA

µA

µA


Supply Current, SHDN

VPIN5 = –3V, VS = ±5V, No Load (Note 10)

l


6

20

µA

ISHDN

Shutdown Pin Current

VPIN5 = –4.7V, VS = ±5V, No Load (Note 10) VPIN5 = –3V, VS = ±5V, No Load (Note 10)

l l


0.5

2


8

nA

µA


Maximum Shutdown Pin Current

VPIN5 = 9V, VS = ±9V (Note 10)

l


10

30

µA


Shutdown Output Leakage Current

VPIN5 = –7V, VS = ±9V, No Load (Note 10)

l

0.05 1

µA

VL

Shutdown Pin Input Low Voltage

VS = ±5V (Note 10)

l

–4.7

V

VH

Shutdown Pin Input High Voltage

VS = ±5V (Note 10)

l

–3

V

tON

Turn-On Time

VPIN5 = 0V to –5V, RL = 10k (Note 10)

l

100

µs

tOFF

Turn-Off Time

VPIN5 = –5V to 0V, RL = 10k (Note 10)

l

6

µs

GBW

Gain Bandwidth Product

f = 5kHz

0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l

120

110

100

225


kHz kHz kHz

SR

Slew Rate

AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C


l l

0.0375

0.033

0.030

0.075


V/µs V/µs V/µs

tS

Settling Time

VOUT = 4V to 0.1%, AV = 1


50

µs

FPBW

Full-Power Bandwidth (Note 9)

VOUT = 8VP-P


3

kHz


The l denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)


SYMBOL


PARAMETER


CONDITIONS

LT1782H

MIN TYP MAX


UNITS

VOS

Input Offset Voltage



l

400 800

3

µV mV

VOS/T

Input Offset Voltage Drift


l

15

µV/°C

IOS

Input Offset Current


VCM = 18V (Note 5)

l l

3

2

nA

µA

IB

Input Bias Current


VCM = 18V (Note 5)

l l

30

25

nA

µA


Input Voltage Range


l

0.3 18

V

CMRR

Common Mode Rejection Ratio

VCM = 0.3V to VCC – 1V VCM = 0.3V to 18V

l l

76

60

dB dB

temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)



SYMBOL


PARAMETER


CONDITIONS


MIN

LT1782H

TYP


MAX


UNITS

AVOL

Large-Signal Voltage Gain

VS = 3V, VO = 500mV to 2.5V, RL = 10k


l

200

50

1500


V/mV V/mV

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


l

400

80

1500


V/mV V/mV

VOL

Output Voltage Swing LOW

No Load ISINK = 5mA

VS = 5V, ISINK = 10mA

l l l

15

900

1500

mV mV mV

VOH

Output Voltage Swing HIGH

VS = 3V, No Load

VS = 3V, ISOURCE = 5mA

l l

2.85

2.20

V V

VS = 5V, No Load

VS = 5V, ISOURCE = 10mA

l l

4.85

3.80

V V

PSRR

Power Supply Rejection Ratio

VS = 3V to 12.5V, VCM = VO = 1V

l

80

dB


Minimum Supply Voltage


l

2.7

V


Reverse Supply Voltage

IS = –100µA

l

18

V

IS

Supply Current



l


40

55

100

µA

µA


Supply Current, SHDN

VPIN5 = 2V, No Load (Note 10)

l

25

µA

ISHDN

Shutdown Pin Current

VPIN5 = 0.3V, No Load (Note 10)

VPIN5 = 2V, No Load (Note 10)

l l


0.5


12

nA

µA


Output Leakage Current

VPIN5 = 2V, No Load (Note 10)

l

3

µA


Maximum Shutdown Pin Current

VPIN5 = 18V, No Load

l

45

µA

VL

Shutdown Pin Input Low Voltage

(Note 10)

l

0.3

V

VH

Shutdown Pin Input High Voltage

(Note 10)

l

2

V

GBW

Gain Bandwidth Product

f = 10kHz (Note 5)


l

110

65

200


kHz kHz

SR

Slew Rate

AV = –1, RL = ∞ (Note 7)


l

0.035

0.020

0.07


V/µs V/µs


The l denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C.

VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V, pulse power tested unless otherwise specified. (Note 4)


SYMBOL


PARAMETER


CONDITIONS


MIN

LT1782H

TYP


MAX


UNITS

VOS

Input Offset Voltage



l


500

900

3.2

µV mV

VOS/T

Input Offset Voltage Drift (Note 9)


l

15

µV/°C

IOS

Input Offset Current


l

3

nA

IB

Input Bias Current


l

30

nA

CMRR

Common Mode Rejection Ratio

VCM = –4.7V to 13V

l

60

dB

AVOL

Large-Signal Voltage Gain

VS = ±4V, RL = 10k


l

55

20

150


V/mV V/mV

VO

Output Voltage Swing

No Load ISINK = ±5mA

ISINK = ±10mA

l l l

±4.85

±4.10

±3.50

V V V

temperature range of –40°C ≤ TA ≤ 125°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V, pulse power tested unless otherwise specified. (Note 4)



SYMBOL


PARAMETER


CONDITIONS

LT1782H

MIN TYP MAX


UNITS

PSRR

Power Supply Rejection Ratio

VS = ±1.5V to ±9V

l

80

dB


Minimum Supply Voltage


l

±1.35

V

IS

Supply Current



l

45 60

110

µA

µA


Supply Current, SHDN

VPIN5 = –3V, VS = ±5V, No Load (Note 10)

l

25

µA

ISHDN

Shutdown Pin Current

VPIN5 = –4.7V, VS = ±5V, No Load (Note 10) VPIN5 = –3V, VS = ±5V, No Load (Note 10)

l l

0.5

12

nA

µA


Maximum Shutdown Pin Current

VPIN5 = 9V, VS = ±9V, No Load (Note 10)

l

45

µA


Output Leakage Current

VPIN5 = –7V, VS = ±9V, No Load

l

3

µA

VL

Shutdown Pin Input Low Voltage

VS = ±5V

l

–4.7

V

VH

Shutdown Pin Input High Voltage

VS = ±5V

l

–3

V

GBW

Gain Bandwidth Product

f = 5kHz


l

120 225

70

kHz kHz

SR

Slew Rate

AV = –1, RL = ∞, VO = ±4V

Measured at VO = ±2V


l

0.0375 0.075

0.0220

V/µs V/µs


Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.

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

Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±5V or VS = ±9V tests.

Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±5V or VS = ±9V tests.

Note 7: Guaranteed by correlation to slew rate at VS = ±5V, and GBW at VS = 3V and VS = ±5V tests.

Note 8: This specification implies a typical input offset voltage of 1.8mV at VCM = 18V and a maximum input offset voltage of 7.2mV at VCM = 18V. 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/2�VP.



Supply Current vs Supply Voltage Minimum Supply Voltage










































TA = 125°C


TA = –55°C










TA


= 25


°C
























50 400

Output Voltage

vs Large Input Voltage

5

VS = 5V, 0V

TA = 125°C

SUPPLY CURRENT (µA)

45


40

TA = 25°C

35 TA = –55°C


30


25


20

300


INPUT OFFSET VOLTAGE CHANGE (µV)

200


100


0


–100


–200


–300


–400


4


VOUT (V)

3


2 5V

VIN +

1


0

2 4 6 8 10 12

14 16 18

0 1 2 3 4 5

–10 –8 –6 –4 –2 0 2 4 6 8 10 12 14 16 18

SUPPLY VOLTAGE (V)


1782 G01

TOTAL SUPPLY VOLTAGE (V)


1782 G02

VIN (V)


1782 G03


Input Bias Current

VS = 5V, 0V

vs Common Mode Voltage

Output Saturation Voltage

vs Load Current (Output High)

Output Saturation Voltage

vs Load Current (Output Low)

6000

1 VS = ±2.5V

1

V = ±2.5V

5000

INPUT BIAS CURRENT (nA)

4000

3000

2000

1000


40

30

20

10

0

–10


C


TA = 125°

TA = 25°C


C

TA = –55°


0.1


OUTPUT SATURATION VOLTAGE (V)

0.01

VOD

= 30mV


TA = 25°C


TA = 125°C


TA = –55°C


0.1


OUTPUT SATURATION VOLTAGE (V)

0.01


0.001

S

VOD = 30mV


TA = 25°C


TA = 125°C


TA = –55°C

3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 15 16 18

1µ 10µ

100µ

1m 10m

1µ 10µ

1µ 1m 10m

COMMON MODE VOLTAGE (V)


1782 G04

SOURCING LOAD CURRENT (A) SINKING LOAD CURRENT (A)

1782 G05


1782 G06



OUTPUT SATURATION VOLTAGE (mV)

100


10

Output Saturation Voltage vs Input Overdrive

Output Short-Circuit Current

vs Temperature 0.1Hz to 10Hz Noise Voltage

VS = ±2.5V































40

VS = ±5V


NOISE VOLTAGE (400nV/DIV)

35

OUTPUT CURRENT (mA)

SINKING CURRENT


30

SOURCING CURRENT

25
















OUTPUT HIGH













































OUTPUT LOW













VS = ±2.5V NO LOAD





1

0 10 20 30 40 50 60

INPUT OVERDRIVE (mV)

1782 G07

20


15

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

1782 G08


0 1 2 3 4 5 6 7 8 9 10

TIME (sec)

1782 G09


Noise Voltage Density

vs Frequency Input Noise Current vs Frequency

VS = ±2.5V

INPUT NOISE VOLTAGE DENSITY (nV/√Hz)

INPUT NOISE CURRENT DENSITY (pA/√Hz)

































































































80 0.40

70 0.35

0.30

60 0.25

50 0.20

40 0.15

0.10

30 0.05

20 0


70

60

50

40

GAIN (dB)

30

20

10

0

–10

–20

–30

Gain and Phase Shift vs Frequency


P

HASE


GAIN


100

VS = ±2.5V

80

60

PHASE SHIFT (DEG)

40

20

0

–20

–40

–60

–80

–100

1 10

100 1k 10k FREQUENCY (Hz)

1782 G10

1 10

100 1k 10k 1k FREQUENCY (Hz)

1782 G11

10k 100k 1M FREQUENCY (Hz)

1782 G12



230


GAIN BANDWIDTH (kHz)

220


210


200


190


180


170

Gain Bandwidth Product

vs Temperature Slew Rate vs Temperature

f = 5kHz VS = ±2.5V









































VS = ±2.5V








RISING













FALLING

























0.11


0.10


SLEW RATE (V/µs)

0.09


0.08


0.07


0.06


0.05


0.04


240


GAIN BAINDWIDTH PRODUCT (kHz)

220


200


180


160

Gain Bandwidth Product and Phase Margin vs Supply Voltage

PHASE MARGIN (DEG)

60

PHASE MARGIN 55

50


GAIN BANDWIDTH PRODUCT


AV = –1

RF = RG = 10k

f = 5kHz

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

1782 G13

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

1782 G14

0 2 4 6 8 10 12 14 16 18

TOTAL SUPPLY VOLTAGE (V)

1782 G15


Gain Bandwidth Product and

VS = ±2.5V

Phase Margin vs Load Resistance PSRR vs Frequency CMRR vs Frequency


GAIN BANDWIDTH PRODUCT (kHz)

250


200


VS = ±2.5V AV = –1

RF = RG = 10k

f = 5kHz

70 90

PHASE MARGIN (DEG)

POWER SUPPLY REJECTION RATIO (dB)

80

PHASE MARGIN 60 70

50 60

50

40

30


POSITIVE SUPPLY

110


VS = ±2.5V

COMMON MODE REJECTION RATIO (dB)

100


90


80


70


60

150


100


50

1k

GAIN BANDWIDTH PRODUCT


10k 100k

LOAD RESISTANCE (Ω)

1782 G16

20

10

0

–10

1k


50


NEGATIVE SUPPLY

40


30

10k 100k 1M 1k

FREQUENCY (Hz)

1782 G17


10k 100k

FREQUENCY (Hz)

1782 G18



10k


OUTPUT IMPEDANCE (Ω)

1k


100


10


1


0.1


Output Impedance vs Frequency


VS = ±2.5V





























AV = 100








































AV = 10













































AV = 1











































































































1M


OUTPUT IMPEDANCE (Ω)

100k


10k


1k


100

Disabled Output Impedance vs Frequency (Note 8)

VS = ±2.5V

VPIN5 (SHUTDOWN) = 2.5V

Settling Time to 0.1% vs Output Step

4


AV = 1

3


OUTPUT STEP (V)

2


1


0 VS = ±5V

–1


AV = –1

AV = 1

–2


–3


–4


AV = –1

100

1k 10k

FREQUENCY (Hz)

100k 1M


1782 G19

100

1k 10k 100k 1M FREQUENCY (Hz)

1782 G20

25 30 35 40 50 60 70 80

SETTLING TIME (µs)

1782 G21


Capacitive Load Handling Overshoot vs Capacitive Load

40 VS = 5V, 0V

Undistorted Output Swing vs Frequency

12 DISTORTION ≤ 1%

Total Harmonic Distortion + Noise vs Frequency

1

VS = 3V, 0V

OVERSHOOT (%)

35 VCM = 2.5V 30

25


AV = 1

20


15


10


5


AV = 10

AV = 5

0

10 VS = ±5V 8

OUTPUT SWING (VP-P)

6


4 VS = ±1.5V

2


0

AV = 1


THD + NOISE (%)

0.1


0.010


0.001

VOUT = 2VP-P VCM = 1.2V RL = 10k


AV = –1

RF = RG = 100k


AV = 1

10 100 1000 10000

100 1k 10k 100k 10

100

1k 10k

CAPACITIVE LOAD (pF)

1782 G22

FREQUENCY (Hz)

1782 G23

FREQUENCY (Hz)

1782 G24

Total Harmonic Distortion + Noise vs Load Resistance

Total Harmonic Distortion + Noise

vs Output Voltage Amplitude Open-Loop Gain

10 VS

= 3V TOTAL

10

VS = ±5V

INPUT OFFSET VOLTAGE CHANGE (50µV/DIV)

f = 1kHz, RL = 10k

AV = 1

VIN = 2VP-P AT 1kHz

1


AV = 1

1 VS = ±1.5V


AV = –1, RF = RG = 100k VS = ±1.5V


THD + NOISE (%)

0.1


0.01


0.001

VS = ±1.5V VIN = ±1V

VS = 3V, 0V

VIN = 0.5V TO 2.5V


VS = 3V, 0V

VIN = 0.2V TO 2.2V


0.1


THD + NOISE (%)

0.01


0.001

VCM = 0V


AV = 1

VS = 3V. 0V VCM = 1.5V

VCM = 0V


AV = –1, RF = RG = 100k VS = 3V, 0V

VCM = 1.5V


RL = 10k

RL = 50k


RL = 2k

100

1k 10k

LOAD RESISTANCE TO GROUND (Ω)

100k

0 1 2 3

OUTPUT VOLTAGE AMPLITUDE (VP-P)

–6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6

OUTPUT VOLTAGE (V)

1782 G25

1782 G26

1782 G27


Supply Current

vs Shutdown Voltage Large-Signal Response Small-Signal Response

VS = 5V, 0V

50

TA = 125°C

SUPPLY CURRENT (µA)

40

TA = 25°C

30

TA = –55°C

20


10


0

0 0.5 1 1.5 2 2.5

SHUTDOWN PIN VOLTAGE (V)


VS = ±5V AV = 1

CL = 15pF


1782 G29 VS = ±5V

AV = 1

CL = 15pF


1782 G30


1782 G28


APPLICATIONS INFORMATION

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 tem- perature 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 tran- sistors, 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 voltage is typically 1.8mV when operating above V+. The LT1782 will operate with its inputs 18V above Vregardless of V+.

The inputs are protected against excursions as much as 10V below Vby 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,


APPLICATIONS INFORMATION

sourcing current is reduced to 10mA at 3V total supplies as noted in the Electrical Characteristics section.

The LT1782 is internally compensated to drive at least 600pF of capacitance under any output loading condi- tions. 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 non- linear 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, 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 performance 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≤ VOUT ≤ V+). In normal opera- tion, the SHDN pin can be tied to Vor left floating. See the Typical Performance Characteristics curves, “Supply

Current vs Shutdown Pin Voltage.”


SIMPLIFIED SCHEMATIC



SHDN


J1


R1

30k


+


Q1


R2

6k

Q4 –IN


R3


D1


Q7 Q8


Q2


Q11 Q12


Q3

D3


Q19


Q17 Q20


Q22

V+


OUT


Q26

2µA

6k

+IN


Q9 Q10


Q13 Q14


Q15

Q16 Q18


Q21



Q25 Q23 Q24 Q5 Q6


D4 D5

R4

40k

R5

40k


V

1782 SS


TYPICAL APPLICATIONS


Protected Fault Conditions


OK!

–18V

V+ LT1782

OK!


+

24V

5V


LT1782


REVERSE BATTERY INPUT OVERVOLTAGE


OK! 5V OK! 5V


+

18V


LT1782 LT1782


+

10V


INPUT DIFFERENTIAL VOLTAGE INPUT BELOW GROUND

1782 TA02


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


VS 2.8V to 3.3V


SUPPLY CURRENT 120µA, NO LOAD



680Q

5%


100k

5%

22Q

5%


+

LT1782


0.1µF


1k

5% VISHAY SILICONIX Si3445DV



LT1790-2.5


1µF


VOUT

1782 TA03 2.5V


ILOAD = 0mA TO 300mA

NOTE: NOT CURRENT LIMITED


PACKAGE DESCRIPTION


S5 Package

5-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1635)

0.62

MAX

0.95

REF

2.90 BSC (NOTE 4)


1.22 REF



3.85 MAX 2.62 REF


1.4 MIN


2.80 BSC

1.50 – 1.75

(NOTE 4)


PIN ONE


RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR


0.95 BSC

0.30 – 0.45 TYP

  1. PLCS (NOTE 3)



    0.20 BSC DATUM ‘A’


    0.09 – 0.20

    (NOTE 3)

    0.80 – 0.90


    1.00 MAX


    0.01 – 0.10


    NOTE:

    0.30 – 0.50 REF


    1.90 BSC

    1. DIMENSIONS ARE IN MILLIMETERS

    2. DRAWING NOT TO SCALE

    3. DIMENSIONS ARE INCLUSIVE OF PLATING

    4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

    5. MOLD FLASH SHALL NOT EXCEED 0.254mm

    6. JEDEC PACKAGE REFERENCE IS MO-193


    S6 Package

    6-Lead Plastic TSOT-23

    (Reference LTC DWG # 05-08-1636)

    S5 TSOT-23 0302 REV B

    0.62

    MAX

    0.95

    REF

    2.90 BSC (NOTE 4)


    1.22 REF



    3.85 MAX 2.62 REF


    1.4 MIN


    2.80 BSC

    1.50 – 1.75


    PIN ONE ID

    (NOTE 4)



    RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR


    0.95 BSC


    0.30 – 0.45

  2. PLCS (NOTE 3)



0.20 BSC DATUM ‘A’


0.09 – 0.20

(NOTE 3)

0.80 – 0.90


1.00 MAX


0.01 – 0.10


NOTE:

0.30 – 0.50 REF

1.90 BSC


S6 TSOT-23 0302 REV B

  1. DIMENSIONS ARE IN MILLIMETERS

  2. DRAWING NOT TO SCALE

  3. DIMENSIONS ARE INCLUSIVE OF PLATING

  4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

  5. MOLD FLASH SHALL NOT EXCEED 0.254mm

  6. JEDEC PACKAGE REFERENCE IS MO-193


1782fc


REVISION HISTORY


(Revision history begins at Rev C)


REV

DATE

DESCRIPTION

PAGE NUMBER

C

10/10

Revised supply current in shutdown mode from 5mA to 5µA in Shutdown section of Applications Information

12



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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

1782fc

15


TYPICAL APPLICATIONS


Current Source


VCC


LT1634-1.25 R1



+

LT1782

R1


2N3906 IOUT = 1.25V

1782 TA04



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


AV = 20



SHDN


+

IN

VCC


AV = 2


SHDN


+

30



















AV = 20

























































AV = 2





































































25

20

VCC 15

GAIN (dB)

10

5

VCC

LT1782

LT1784

VEE

OUT

0

–5

–10

–15


R2 9.09k


R1

10k


VEE

AV = 1+ R1 + R2

( )

( )

R3

OR 1+ R1

R2 + R3

–20

1k


10k


100k 1M 10M FREQUENCY (Hz)

1782 TA06


1782 TA05

R3

1k


RELATED PARTS


PART NUMBER

DESCRIPTION

COMMENTS

LT1783

Micropower Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp

SOT-23 Package, Micropower 210µA per Amplifier, Rail-to-Rail Input and Output, 1.25MHz GBW

LT1490/LT1491

Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

Single Supply Input Range: –0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output , 200kHz GBW

LT1636

Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp

55µA Supply Current, VCM Extends 44V Above VEE, Independent of VCC, MSOP Package, Shutdown Function

LT1638/LT1639

Dual/Quad, 1.2MHz, 0.4V/µs, Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

170mA Supply Current, Single Supply Input Range: –0.4V to 44V, Rail-to-Rail Input and Output



16

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

1782fc


LT 1010 REV C • PRINTED IN USA

(408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 1999

Mouser Electronics


Authorized Distributor


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