LT1636CN8_技术文档

LT1636

Ove r-The -To p

Mic ro p o we r Ra il-to -Ra il

Inp ut a nd Outp ut Op Am p

U

FEATURES

DESCRIPTIO

®

■

Rail-to-Rail Input and Output

Micropower: 50

TheLT 1636opampoperates onallsingleandsplitsupplies

■

µA I_Q, 44V Supply

with a total voltage of 2.7V to 44V drawing less than 50µA of

quiescentcurrent.TheLT1636canbeshutdown,makingthe

outputhighimpedanceandreducingthequiescentcurrentto

4µA. The LT1636 has a unique input stage that operates and

remainshighimpedancewhenabovethepositivesupply.The

inputs take 44V both differential and common mode, even

when operating on a 3V supply. The output swings to both

supplies. Unlike most micropower op amps, the LT1636 can

drive heavy loads; its rail-to-rail output drives 18mA. The

LT1636 is unity-gain stable into all capacitive loads up to

10,000pF when a 0.22µF and 150Ω compensation network

is used.

■

MSOP Package

Over-The-Top^TM: Input Common Mode Range

Extends 44V Above V , Independent of V

EE

CC

■

Low Input Offset Voltage: 225µV Max

Specified on 3V, 5V and ±15V Supplies

High Output Current: 18mA

Output Shutdown

Output Drives 10,000pF with Output Compensation

Reverse Battery Protection to 27V

High Voltage Gain: 2000V/mV

High CMRR: 110dB

220kHz Gain-Bandwidth Product

The LT1636 is reverse supply protected: it draws no current

for reverse supply up to 27V. Built-in resistors protect the

inputs for faults below the negative supply up to 22V. There

is no phase reversal of the output for inputs 5V below V or

44V above V , independent of V .

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APPLICATIO S

EE

■

Battery- or Solar-Powered Systems

EE

CC

Portable Instrumentation

Sensor Conditioning

Supply Current Sensing

Battery Monitoring

MUX Amplifiers

TheLT1636opampis availableinthe8-pinMSOP, PDIPand

SO packages.

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

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

■

4mA to 20mA Transmitters

U

TYPICAL APPLICATIO

Input Bias Current vs Common Mode Voltage

5000

Over-The-Top Current Source with Shutdown

V = 5V, 0V

S

3000

1000

4V TO

44V

LT1004-1.2

R*

1M

R

40

30

+

LT1636

J176

T

A

= –55°C

20

–

1.2

R

10

I

=

OUT

e.g., 10mA = 120Ω

T

= 125°C

A

I

0

OUT

T

A

= 25°C

–10

SHDN

*OPTIONAL FOR LOW OUTPUT CURRENTS

1636 TA01

4.0

4.4

4.8

50

5.2 10 20 30 40

COMMON MODE VOLTAGE (V)

1636 G03

1

LT1636

W W

U W

ABSOLUTE MAXIMUM RATINGS _{(Note 1)}

Total Supply Voltage (V⁺to V^–) .............................. 44V

Input Differential Voltage ......................................... 44V

Input Current ...................................................... ±25mA

Shutdown Pin Voltage Above V^–............................. 32V

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

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

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

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

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

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

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

W U

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PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

NUMBER

NULL

–IN

1

2

3

4

NULL

8

7

6

5

TOP VIEW

+

V

LT1636CN8

LT1636CS8

LT1636IN8

LT1636IS8

1

2

8 NULL

7 V

NULL

–IN

LT1636CMS8

+

+IN

OUT

6 OUT

5 SHDN

+IN 3

–

V

SHDN

V

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

_JMAX= 150°C, θ_JA= 250°C/ W

N8 PACKAGE

8-LEAD PLASTIC DIP

MS8 PART MARKING

LTCL

T

S8 PACKAGE

8-LEAD PLASTIC SO

S8 PART MARKING

T

_JMAX= 150°C, θ_JA= 130°C/ W (N8)

1636

1636I

T_JMAX= 150°C, θ_JA= 190°C/ W (S8)

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

3V, 5V

V = 3V, 0V; V = 5V, 0V; V_CM= V_OUT= half supply, Pin 5 = open or V , Pins 1 and 8 open, T_A= 25°C unless otherwise noted. (Note 3)

S

EE

SYMBOL

PARAMETER

Input Offset Voltage

CONDITIONS

MIN

TYP

MAX

UNITS

V

OS

N8 Package

50

225

400

550

µV

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

S8 Package

50

225

600

750

µV

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

MS8 Package

225

700

850

µV

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

Input Offset Voltage Drift (Note 8)

N8 Package, –40°C ≤ T ≤ 85°C

●

1

2

5

8

10

µV/°C

A

S8 Package, –40°C ≤ T ≤ 85°C

A

MS8 Package, –40°C ≤ T ≤ 85°C

A

I

Input Offset Current

Input Bias Current

●

0.1

0.8

0.6

nA

µA

OS

V

= 44V (Note 4)

CM

I

B

●

5

3

0.1

8

6

nA

µA

nA

V

= 44V (Note 4)

CM

V = 0V

S

Input Noise Voltage

0.1Hz to 10Hz

f = 1kHz

0.7

52

µV

P-P

e

Input Noise Voltage Density

Input Noise Current Density

nV/√Hz

pA/√Hz

n

i

n

f = 1kHz

0.035

2

LT1636

3V, 5V ELECTRICAL CHARACTERISTICS

V = 3V, 0V; V = 5V, 0V; V_CM= V_OUT= half supply, Pin 5 = open or V , Pins 1 and 8 open, T_A= 25°C unless otherwise noted. (Note 3)

S

EE

SYMBOL

PARAMETER

Input Resistance

CONDITIONS

MIN

TYP

MAX

UNITS

R

IN

Differential

Common Mode, V = 0V to 44V

6

7

10

15

MΩ

CM

C

IN

Input Capacitance

4

pF

V

Input Voltage Range

●

0

44

CMRR

Common Mode Rejection Ratio

(Note 4)

V

CM

= 0V to V – 1V

= 0V to 44V (Note 7)

●

84

86

110

98

dB

CM

CC

A

VOL

Large-Signal Voltage Gain

V = 3V, V = 500mV to 2.5V, R = 10k

200

133

100

1300

V/mV

S

O

L

V = 3V, 0°C ≤ T ≤ 70°C

●

S

A

V = 3V, –40°C ≤ T ≤ 85°C

S

A

V = 5V, V = 500mV to 4.5V, R = 10k

400

250

200

2000

V/mV

S

O

L

V = 5V, 0°C ≤ T ≤ 70°C

●

S

A

V = 5V, –40°C ≤ T ≤ 85°C

S

A

V

Output Voltage Swing LOW

Output Voltage Swing HIGH

No Load

●

2

480

860

10

875

1600

mV

OL

I

= 5mA

SINK

V = 5V, I

S

= 10mA

SINK

V

OH

V = 3V, No Load

●

2.95

2.55

2.985

2.8

V

S

V = 3V, I

S

= 5mA

SOURCE

V = 5V, No Load

●

4.95

4.30

4.985

4.75

V

S

V = 5V, I

= 10mA

S

SOURCE

I

SC

Short-Circuit Current (Note 2)

V = 3V, Short to GND

7

20

15

42

mA

S

V = 3V, Short to V

S

CC

V = 5V, Short to GND

12

25

50

mA

S

V = 5V, Short to V

S

CC

PSRR

Power Supply Rejection Ratio

Reverse Supply Voltage

Supply Current (Note 5)

V = 2.7V to 12.5V, V = V = 1V

●

90

27

103

40

dB

V

S

CM

O

I = –100µA

S

I

S

42

55

60

µA

●

Supply Current, SHDN

Shutdown Pin Current

V

PIN5

= 2V, No Load (Note 5)

4

12

µA

I

SD

V

PIN5

= 0.3V, No Load (Note 5)

= 2V, No Load (Note 4)

●

0.5

1.1

15

5

nA

µA

PIN5

Output Leakage Current

Maximum Shutdown Pin Current

Turn-On Time

V

= 2V, No Load (Note 5)

= 32V, No Load (Note 4)

●

0.05

27

1

µA

µs

PIN5

V

PIN5

150

t

V

PIN5

= 5V to 0V, R = 10k

120

2.5

ON

L

Turn-Off Time

V

PIN5

= 0V to 5V, R = 10k

µs

OFF

L

GBW

Gain Bandwidth Product

(Note 4)

f = 1kHz

0°C ≤ T ≤ 70°C

110

100

90

200

kHz

●

A

–40°C ≤ T ≤ 85°C

A

SR

Slew Rate

(Note 6)

A = –1, R =

∞

0.035

0.031

0.030

0.07

V/µs

V

L

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

3

LT1636

ELECTRICAL CHARACTERISTICS

±15V

V = ±15V, V_CM= 0V, V_OUT= 0V, Pin 5 = open or V , Pins 1 and 8 open, T_A= 25°C unless otherwise noted. (Note 3)

S

EE

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

OS

Input Offset Voltage

N8 Package

100

450

550

700

µV

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

S8 Package

100

450

750

900

µV

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

MS8 Package

450

850

1000

µV

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

Input Offset Voltage Drift (Note 8)

N8 Package, –40°C ≤ T ≤ 85°C

●

1

2

4

8

10

µV/°C

A

S8 Package, –40°C ≤ T ≤ 85°C

A

MS8 Package, –40°C ≤ T ≤ 85°C

A

I

Input Offset Current

Input Bias Current

●

0.2

4

1.0

10

nA

OS

I

B

Input Noise Voltage

0.1Hz to 10Hz

f = 1kHz

1

µV

P-P

e

Input Noise Voltage Density

Input Noise Current Density

Input Resistance

52

nV/√Hz

pA/√Hz

n

i

n

f = 1kHz

0.035

R

IN

Differential

Common Mode, V = –15V to 14V

5.2

13

12000

MΩ

CM

C

Input Capacitance

4

pF

V

IN

Input Voltage Range

●

–15

86

29

CMRR

Common Mode Rejection Ratio

Large-Signal Voltage Gain

V

= –15V to 29V

103

500

dB

CM

A

VOL

V = ±14V, R = 10k

100

75

50

V/mV

O

L

0°C ≤ T ≤ 70°C

–40°C ≤ T ≤ 85°C

●

A

V

Output Voltage Swing LOW

Output Voltage Swing HIGH

Short-Circuit Current (Note 2)

No Load

●

–14.997 –14.95

–14.500 –14.07

–14.125 –13.35

V

OL

I

= 5mA

SINK

I

= 10mA

SINK

V

OH

No Load

●

14.9

14.5

14.3

14.975

14.750

14.650

V

I

= 5mA

SOURCE

I

= 10mA

SOURCE

I

SC

Short to GND

0°C ≤ T ≤ 70°C

±18

±15

±10

±30

mA

●

A

–40°C ≤ T ≤ 85°C

A

PSRR

Power Supply Rejection Ratio

Supply Current

V = ±1.35V to ±22V

●

90

114

dB

S

I

S

50

70

85

µA

●

Positive Supply Current, SHDN

Shutdown Pin Current

V

PIN5

= –20V, V = ±22V, No Load

12

30

µA

S

I

V

PIN5

= –21.7V, V = ±22V, No Load

●

0.7

1.2

15

8

nA

µA

SHDN

S

V

PIN5

= –20V, V = ±22V, No Load

S

Maximum Shutdown Pin Current

Output Leakage Current

V

= 32V, V = ±22V

●

27

0.1

220

150

2

µA

PIN5

S

V

PIN5

= –20V, V = ±22V, No Load

S

GBW

Gain Bandwidth Product

f = 1kHz

0°C ≤ T ≤ 70°C

–40°C ≤ T ≤ 85°C

125

110

100

kHz

●

A

4

LT1636

±15V ELECTRICAL CHARACTERISTICS

V = ±15V, V_CM= 0V, V_OUT= 0V, Pin 5 = open or V , Pins 1 and 8 open, T_A= 25°C unless otherwise noted. (Note 3)

S

EE

SYMBOL

SR

PARAMETER

CONDITIONS

A = –1, R =

MIN

TYP

MAX

UNITS

Slew Rate

∞

, V = ±10V Measured at ±5V

0.0375

0.033

0.030

0.075

V/µs

V

L

O

0°C ≤ T ≤ 70°C

●

A

–40°C ≤ T ≤ 85°C

A

The

● denotes specifications that apply over the full specified temperature

Note 4: V = 5V limits are guaranteed by correlation to V = 3V, and

S

range.

V = ±15V or V = ±22V tests.

S

Note 1: Absolute Maximum Ratings are those values beyond which the life

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

S

of a device may be impaired.

V = ±15V or V = ±22V tests.

S

Note 2: A heat sink may be required to keep the junction temperature

Note 6: Guaranteed by correlation to slew rate at V = ±15V, and GBW at

S

below absolute maximum.

V = 3V and V = ±15V tests.

S

Note 3: The LT1636C is guaranteed to meet specified performance from

0°C to 70°C and is designed, characterized and expected to meet these

extended temperature limits, but is not tested at –40°C and 85°C. The

LT1636I is guaranteed to meet the extended temperature limits.

Note 7: This specification implies a typical input offset voltage of 600µV at

= 44V and a maximum input offset voltage of 3mV at V = 44V.

V

CM

Note 8: This parameter is not 100% tested.

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Input Bias Current

Supply Current vs Supply Voltage

vs Common Mode Voltage

Minimum Supply Voltage

300

200

5000

3000

1000

80

70

60

50

40

30

20

10

0

V = 5V, 0V

S

T = 25°C

A

100

40

30

0

T = 125°C

A

T = –55°C

A

–100

–200

–300

T = –55°C

A

20

T = 125°C

T = –55°C

A

10

T = 125°C

A

T = 25°C

A

0

T = 25°C

A

–10

0

5

10 15 20 25 30 35 40 45

TOTAL SUPPLY VOLTAGE (V)

1636 G01

0

1

2

3

4

5

4.0

4.4

4.8

50

5.2 10 20 30 40

TOTAL SUPPLY VOLTAGE (V)

COMMON MODE VOLTAGE (V)

1636 G02

1636 G03

Output Saturation Voltage

vs Load Current (Output High)

Output Saturation Voltage

vs Load Current (Output Low)

Output Saturation Voltage

vs Input Overdrive

10

1

100

90

80

70

60

50

40

30

20

10

0

V = 5V

S

V = 5V

S

V = ±2.5V

NO LOAD

S

V

OD

= 30mV

V

OD

= 30mV

0.1

T = 125°C

A

T = 125°C

A

T = 25°C

A

T = 25°C

A

0.01

OUTPUT HIGH

OUTPUT LOW

T = –55°C

A

T = –55°C

A

0.001

0.01

0.0001 0.001 0.01

0.1

1

10

100

0

10 20 30 40 50 60 70 80 90 100

INPUT OVERDRIVE (mV)

1636 G06

0.0001 0.001 0.01

0.1

1

10

100

SINKING LOAD CURRENT (mA)

SOURCING LOAD CURRENT (mA)

1636 G05

1636 G04

5

LT1636

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Noise Voltage Density

vs Frequency

0.1Hz to 10Hz Noise Voltage

Input Noise Current vs Frequency

80

70

60

50

40

30

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

V = ±2.5V

S

1

10

100

1000

0

1

2

3

4

5

6

7

8

9

10

1

10

100

1000

TIME (SEC)

FREQUENCY (Hz)

1635 G09

1636 G08

1636 G07

Open-Loop Gain and Phase Shift

vs Frequency

Gain-Bandwidth Product

vs Temperature

Slew Rate vs Temperature

70

60

50

40

100

80

260

240

220

200

0.12

0.11

0.10

0.09

0.08

0.07

0.06

0.05

0.04

V = ±2.5V

S

f = 1kHZ

RISING, V = ±1.5V

S

60

RISING, V = ±15V

S

40

V = ±15V

S

PHASE

30

20

0

FALLING, V = ±15V

S

GAIN

V = ±1.5V

S

10

0

–20

–40

–60

–80

–100

180

160

140

FALLING, V = ±1.5V

S

–10

–20

–30

1k

10k

100k

1M

–50

25

50

75

100 125

–50 –25

0

25

50

75 100 125

–25

0

FREQUENCY (Hz)

TEMPERATURE (°C)

1636 G10

1636 G11

1636 G12

Gain-Bandwidth Product and

Phase Margin vs Supply Voltage

CMRR vs Frequency

PSRR vs Frequency

120

110

100

90

80

70

300

280

50

40

V = ±2.5V

S

R

= 10k

L

f = 1kHz

60

POSITIVE SUPPLY

PHASE MARGIN

50

260

V = ±15V

S

80

40

70

30

240

220

V = ±1.5V

S

60

20

GAIN BANDWIDTH

NEGATIVE SUPPLY

30

20

50

10

40

0

200

180

30

–10

–20

20

1K

10K

100K

1k

10k

FREQUENCY (Hz)

100k

0

5

10 15 20 25 30 35 40 45

TOTAL SUPPLY VOLTAGE (V)

FREQUENCY (Hz)

1636 G14

1636 G15

1636 G13

6

LT1636

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Gain-Bandwidth Product and

Phase Margin vs Load Resistance

Undistorted Output Swing

vs Frequency

Output Impedance vs Frequency

10k

1k

450

400

350

300

250

200

150

100

50

80

70

60

50

40

30

20

10

0

35

30

25

20

15

10

5

V = ±2.5V

DISTORTION ≤ 1%

A = 1

V

S

V = ±15V

s

A = 100

V

PHASE MARGIN

100

10

A = 10

V

A = 1

V

1

V = ±2.5V

s

GAIN BANDWIDTH

0.1

100

0

100

1k

10k

100k

1k

10k

100k

1k

10k

100k

LOAD RESISTANCE (Ω)

FREQUENCY (Hz)

1635 G17

1635 G18

1636 G16

Capacitive Load Handling,

Overshoot vs Capacitive Load

Settling Time to 0.1%

vs Output Step

Total Harmonic Distortion + Noise

vs Frequency

100

90

10

8

10

1

V = ±2.5V

V = ±15V

S

V = 3V, 0V

S

I

= 40µA

V

OUT

= 2V

SOURCE

NO OUTPUT COMPENSATION

P-P

A = 1

V

CM

= 1.2V

80

6

R = 50k

L

A = –1

V

70

4

A = 1

V

A = 2

V

60

50

2

0

0.1

40

30

20

10

0

–2

–4

–6

–8

–10

A = –1

V

0.01

A = 5

V

A = 10

V

A = 1

V

A = –1

V

A = 1

V

0.001

10

100

1000

10000

100 160

120 140

0

80

20 40 60

10

100

1k

10k

FREQUENCY (Hz)

SETTLING TIME (µs)

CAPACITIVE LOAD (pF)

1636 G20

1636 G19

1636 G21

Total Harmonic Distortion + Noise

vs Load Resistance

Total Harmonic Distortion + Noise

vs Output Voltage

10

1

10

1

R = 10k

V = 3V TOTAL

L

S

V

CM

= HALF SUPPLY

A = 1

V

IN

f = 1kHz

= 2V AT 1kHz

P-P

V = ±1.5V

S

V

IN

= ±1V

A = –1

V

A = 1

V

V = ±1.5V

S

V = ±1.5V

S

V = 3V, 0V

S

= 0.5V TO 2.5V

0.1

V

IN

A = –1

V

V = 3V, 0V

S

0.01

V = 3V, 0V

S

0.01

V

IN

= 0.2V TO 2.2V

A = 1

V

V = 3V, 0V

S

0.001

0

1

2

3

100

1k

10k

100k

OUTPUT VOLTAGE (V

)

P-P

LOAD RESISTANCE TO GROUND (Ω)

1636 G23

1636 G22

7

LT1636

TYPICAL PERFOR A CE CHARACTERISTICS

U W

Open-Loop Gain

Large-Signal Response

Small-Signal Response

A

B

C

A: R_L= 2k

B: R_L= 10k

C: R_L= 50k

C

A

1636 G24

1636 G25

1636 G26

0V

10V

V = ±15V –10V

S

V = ±15V

A_V= –1

V = ±15V

A_V= 1

S

OUTPUT VOLTAGE (5V/DIV)

U

W U U

APPLICATIONS INFORMATION

Supply Voltage

cause the voltage at which operation switches from the

PNPstagetotheNPNstagetomovetowards V⁺. Theinput

offset voltage of the NPN stage is untrimmed and is

typically 600µV.

The positive supply pin of the LT1636 should be bypassed

with a small capacitor (about 0.01µF) within an inch of the

pin. When driving heavy loads an additional 4.7µF electro-

lytic capacitor should be used. When using split supplies,

the same is true for the negative supply pin.

A Schottky diode in the collector of each NPN transistor of

the NPN input stage allows the LT1636 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 3µA at room temperature. The

input offset voltage is typically 600µV when operating

aboveV⁺.TheLT1636willoperatewithits input44Vabove

V^–regardless of V⁺.

The LT1636 is protected against reverse battery voltages

up to 27V. In the event a reverse battery condition occurs,

the supply current is less than 1nA.

When operating the LT1636 on total supplies of 20V or

more, the supply must not be brought up faster than 1µs.

This is especially true if low ESR bypass capacitors are

used. A series RLC circuit is formed from the supply lead

inductance and the bypass capacitor. 5Ω of resistance in

the supply or the bypass capacitor will dampen the tuned

circuit enough to limit the rise time.

The inputs are protected against excursions as much as

22V below V^–by an internal 1k resistor in series with each

input and a diode from the input to the negative supply.

Thereis nooutputphasereversalforinputs upto5Vbelow

V^–. There are no clamping diodes between the inputs and

the maximum differential input voltage is 44V.

Inputs

The LT1636 has two input stages, NPN and PNP (see

Simplified Schematic), resulting in three distinct operat-

ingregions as shownintheInputBias Currentvs 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

–4nA. When the input voltage is about 0.5V or less from

V⁺, the NPN input stage is operating and the input bias

current is typically 10nA. Increases in temperature will

Output

The output voltage swing of the LT1636 is affected by in-

put overdrive as shown in the typical performance curves.

When monitoring voltages within 100mV of V⁺, gain

should be taken to keep the output from clipping.

The output of the LT1636 can be pulled up to 27V beyond

V⁺with less than 1nA of leakage current, provided that V⁺

is less than 0.5V.

8

LT1636

U

W U U

APPLICATIONS INFORMATION

The normally reverse biased substrate diode from the

outputtoV^–willcauseunlimitedcurrents toflowwhenthe

output is forced below V^–. If the current is transient and

limited to 100mA, no damage will occur.

returned to ground. The typical performance photo of

Open-Loop Gain for various loads shows the details.

Shutdown

The LT1636 can be shut down two ways: using the

shutdownpinorbringingV⁺towithin0.5VofV^–.WhenV⁺

is brought to within 0.5V of V^–both the supply current and

output leakage current drop to less than 1nA. When the

shutdown pin is brought 1.2V above V^–, the supply

current drops to about 4µA and the output leakage current

is less than1µA,independentofV⁺.Ineithercasetheinput

bias current is less than 0.1nA (even if the inputs are 44V

above the negative supply).

The shutdown pin can be taken up to 32V above V^–. The

shutdown pin can be driven below V^–, however the pin

currentthroughthesubstratediodeshouldbelimitedwith

an external resistor to less than 10mA.

The LT1636 is internally compensated to drive at least

200pF 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 of distortion in op amps:

output crossover distortion as the output transitions from

sourcing to sinking current and distortion caused by

nonlinear common mode rejection. Of course, if the op

amp is operating inverting there is no common mode

induced distortion. When the LT1636 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 LT1636 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 Character-

istics curves.

Input Offset Nulling

The input offset voltage can be nulled by placing a 10k

potentiometer between Pins 1 and 8 with its wiper to V^–

(see Figure 1). The null range will be at least ±1mV.

LT1636

8

1

10k

Gain

The open-loop gain is less sensitive to load resistance

when the output is sourcing current. This optimizes per-

formance in single supply applications where the load is

–

V

1636 AI01

Figure 1. Input Offset Nulling

9

LT1636

U

TYPICAL APPLICATIONS

MUX Amplifier

MUX Amplifier Waveforms

5V

+

V

IN1

LT1636

SHDN

V

OUT

–

5V

+

V

IN2

LT1636

SHDN

–

V = 5V

S

V

_IN1= 1.2kHz AT 4V_P-P, V_IN2= 2.4kHz AT 2V

P-P

INPUT SELECT = 120Hz AT 5V

P-P

INPUT

1636 TA05

SELECT

74HC04

Optional Output Compensation for

Capacitive Loads Greater Than 200pF

V

IN

+

LT1636

C ≤ 10,000pF

L

–

0.22µF

150Ω

1636 TA09

W

SI PLIFIED SCHEMATIC

+

7

V

Q1

Q13

Q19

Q20

Q25

D1

D2

Q23

R3

1k

R2

30k

D3

–IN

+IN

2

3

Q21

Q22

Q24

SHDN

5

Q2

2µA

R4

1k

6

OUT

Q9

Q10

Q14 Q15

Q18

R1

1M

Q11

Q12

Q16

Q17

Q26

Q3

Q4

R5

R6

40k

Q6

Q8

D4

D5

Q5

Q7

NULL

1

8

NULL

R7

R8

300Ω

–

4

V

1636 SS

10

LT1636

U

PACKAGE DESCRIPTION ^{Dimensions in inches (millimeters) unless otherwise noted.}

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660)

0.118 ± 0.004*

(3.00 ± 0.102)

8

7

6

5

0.040 ± 0.006

(1.02 ± 0.15)

0.034 ± 0.004

(0.86 ± 0.102)

0.007

(0.18)

0° – 6° TYP

0.118 ± 0.004**

(3.00 ± 0.102)

SEATING

PLANE

0.192 ± 0.004

(4.88 ± 0.10)

0.012

(0.30)

REF

0.021 ± 0.006

(0.53 ± 0.015)

0.006 ± 0.004

(0.15 ± 0.102)

0.0256

(0.65)

TYP

MSOP (MS8) 1197

1

2

3

4

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

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

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

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

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.400*

(10.160)

MAX

0.130 ± 0.005

0.300 – 0.325

0.045 – 0.065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.255)

8

7

6

5

0.065

(1.651)

TYP

0.255 ± 0.015*

(6.477 ± 0.381)

0.009 – 0.015

0.125

(0.229 – 0.381)

0.020

(3.175)

MIN

+0.035

–0.015

(0.508)

MIN

1

2

4

3

0.325

N8 1197

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

+0.889

–0.381

8.255

(

)

(0.457 ± 0.076)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*

(4.801 – 5.004)

0.010 – 0.020

(0.254 – 0.508)

7

5

8

6

× 45°

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.008 – 0.010

(0.203 – 0.254)

0°– 8° TYP

0.150 – 0.157**

(3.810 – 3.988)

0.228 – 0.244

(5.791 – 6.197)

0.016 – 0.050

0.406 – 1.270

0.050

(1.270)

TYP

0.014 – 0.019

(0.355 – 0.483)

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

SO8 0996

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

1

3

4

2

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 represen-

tationthattheinterconnectionofits circuits as describedhereinwillnotinfringeonexistingpatentrights.

11

LT1636

U

TYPICAL APPLICATIONS

Over-The-Top Comparator with Hysteresis

Self-Buffered Micropower Reference

1M

4V TO 44V

3V TO 44V

10k

IN1

(0V TO 44V)

+

–

V

OUT

= 1.25V

V

OUT

LT1636

I

≤ 10mA

OUT

+

–

1M

1N5711

1M

2N5087

2N5210

1M

10k

1M

IN2

(0V TO 44V)

0.1µF

LT1634-1.25

V

100

CC

HYSTERESIS =

1636 TA04

1636 TA03

Lamp Outage Detector

Over-The-Top Current Sense

0.1V TO 44V

3V

5V TO 44V

1M

R1

200Ω

LAMP

ON/OFF

100k

5k

5V

R

0.2Ω

–

S

+

–

0.5Ω

OUT

LT1636

+

V

OUT

(0V TO 4.3V)

I

LOAD

R2

2k

V

OUT = 0V FOR GOOD BULB

3V FOR OPEN BULB

OUT

LOAD

I

=

LOAD

1636 TA08

(R )(R2/R1)

S

1636 TA07

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LT1460

Micropower Precision Series Reference

Accuracy: 0.075% Max, Drift: 10ppm/°C Max,

2.5V, 5V, 10V Versions Available

LT1466/LT1467

LT1490/LT1491

LT1495/LT1496

75µA Dual/Quad Rail-to-Rail Input and Output Op Amps

50µA Dual/Quad Rail-to-Rail Input and Output Op Amps

390µV V

, Gain Bandwidth = 120kHz

, Gain Bandwidth = 200kHz

, 1.5µA Supply Current Max

OS(MAX)

950µV V

OS(MAX)

1.5µA Max, Dual/Quad Precision Rail-to-Rail Input and Output

375µV V

OS(MAX)

Op Amps

LT2078/LT2079

LT2178/LT2179

55µA Dual/Quad Precision Single Supply Op Amps

17µA Dual/Quad Precision Single Supply Op Amps

120µV V

, Gain Bandwidth = 200kHz

, Gain Bandwidth = 60kHz

OS(MAX)

120µV V

OS(MAX)

1636f LT/TP 1098 4K • PRINTED IN USA

12 ^{Linear Technology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

(408)432-1900 FAX:(408)434-0507 www.linear-tech.com

LINEAR TECHNOLOGY CORPORATION 1998


型号：	LT1636CN8
厂家：	Linear
描述：	Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp 过度的顶级微功耗轨至轨输入和输出运算放大器运算放大器
文件：	总12页 (文件大小：139K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1636CN8 [Linear]

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