LTC1040CSW#PBF Datasheet LTC1040CSW#PBF, LTC1040CN#PBF, LTC1040CSW#TRPBF | P1-P3

1

LTC1040

1040fa

■

Micropower

1.5µW (1 Sample/Second)

■

Power Supply Flexibility

Single Supply 2.8V to 16V

Split Supply ±2.8V to ±8V

■

Guaranteed

Max Offset 0.75mV

■

Guaranteed

Max Tracking Error Between Input

Pairs ± 0.1%

■

Input Common Mode Range to Both Supply Rails

■

TTL/CMOS Compatible with ±5V or Single 5V

Supply

■

Input Errors are Stable with Time and Temperature

The LTC

®

1040 is a monolithic CMOS dual comparator

manufactured using Linear Technology’s enhanced

LTCMOS

TM

silicon gate process. Extremely low operating

power levels are achieved by internally switching the

comparator ON for short periods of time. The CMOS

output logic holds the output information continuously

while not consuming any power.

In addition to switching power ON, a switched output is

provided to drive external loads during the comparator’s

active time. This allows not only low comparator power,

but low total system power.

Sampling is controlled by an external strobe input or an

internal oscillator. The oscillator frequency is set by an

external RC network.

Each comparator has a unique input structure, giving two

differential inputs. The output of the comparator will be

high if the algebraic sum of the inputs is positive and low

if the algebraic sum of the inputs is negative.

Window Comparator with Symmetric Window Limits

Dual Micropower

Comparator

Typical LTC1040 Supply Current

vs Sampling Frequency

FEATURES

APPLICATIO S

U

DESCRIPTIO

U

■

Battery-Powered Systems

■

Remote Sensing

■

Window Comparator

■

BANG-BANG Controllers

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

V

C

A

OUT

= “1” WHEN

V

IN

> V

C

+ ∆

B

OUT

= “1” WHEN

V

IN

< V

C

– ∆

A + B = “1” WHEN

V

C

– ∆ ≤ V

IN

≤ V

C

+ ∆

V

IN

∆

LTC1040 • TA01

–

+

–

+

COMP A

COMP B

LTC1040

SAMPLING FREQUENCY, f

S

(Hz)

0.1

SUPPLY CURRENT, I

S

(µA)

10

100

1000

1,000

LTC1040 • TA02

1

0.10

0.01

1

10

100

10,000

V

S

= ±5V

R

EXT

= 10M

EXTERNALLY STROBED

TYPICAL APPLICATIO

U

LTCMOS™ is a trademark of Linear Technology Corporation.

2

LTC1040

1040fa

ORDER PART

NUMBER

LTC1040CN

LTC1040CSW

LTC1040MJ

LTC1040CJ

N PACKAGE

18-LEAD PDIP

TOP VIEW

1

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

10

STROBE

ON/OFF

A + B

A

OUT

A1

+

A1

–

A2

+

A2

–

GND

V

+

V

P-P

OSC

B

OUT

B1

+

B1

–

B2

+

B2

–

V

–

J PACKAGE

18-LEAD CERDIP

T

JMAX

= 150°C, θ

JA

= 80°C/W

SW PACKAGE

18-LEAD PLASTIC SO WIDE

T

JMAX

= 110°C, θ

JA

= 120°C/W (N)

T

JMAX

= 125°C, θ

JA

= 85°C/W (SW)

Total Supply Voltage (V

+

to V

–

) ............................... 18V

lnput Voltage ........................ (V

+

+ 0.3V) to (V

–

– 0.3V)

Operating Temperature Range

LTC1040C..................................... –40°C ≤ T

A

≤ 85°C

LTC1040M (OBSOLETE) .................... –55°C to 125°C

Storage Temperature Range ................. –55°C to 150°C

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

Output Short-Circuit Duration.......................Continuous

ABSOLUTE AXI U RATI GS

WWWU

PACKAGE/ORDER I FOR ATIO

UU

W

(Note 1)

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. Test conditions: V

+

= 5V, V

–

= –5V, unless otherwise noted.

LTC1040M/LTC1040C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

Offset Voltage (Note 2) Split Supplies ±2.8V to ±6V ● ±0.3 ± 0.75 mV

Single Supply (V

–

= GND) 2.8V to 6V

Split Supplies ±6V to ±8V ● ±1 ±4.5 mV

Single Supply (V

–

= GND) 6V to 15V

Tracking Error Between Split Supplies ±2.8V to ±8V ● 0.05 0.1 %

Input Pairs (Notes 2 and 3) Single Supplies (V

–

= GND) 2.8 to 16V

I

BIAS

Input Bias Current OSC = GND ±0.3 nA

R

IN

Average Input Resistance f

S

= 1kHz (Note 4) ● 20 30 MΩ

CMR Common Mode Range ● V

–

V

+

V

PSR Power Supply Range Split Supplies ● ±2.8 ±8 V

Single Supplies (V

–

= GND) ● 2.8 16 V

I

S(ON)

Power Supply ON Current (Note 5) V

+

= 5V, V

P-P

On ● 1.2 3 mA

I

S(OFF)

Power Supply OFF Current (Note 5) V

+

= 5V, V

P-P

Off LTC1040C ● 0.001 0.5 µA

LTC1040M ● 0.001 5 µA

t

D

Response Time (Note 6) 60 80 100 µs

A, B, A + B and

ON/OFF Outputs (Note 7)

V

OH

Logic “1” Output Voltage V

+

= 4.75V, l

OUT

= –360µA ● 2.4 4.4 V

V

OL

Logic “0” Output Voltage V

+

= 4.75V, l

OUT

= 1.6mA ● 0.25 0.4 V

OBSOLETE PACKAGE

Consider the N18 Package as an Alternate Source

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

3

LTC1040

1040fa

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

of a device may be impaired.

Note 2: Applies over input voltage range limit and includes gain

uncertainty.

Note 3: Tracking error = (V

IN1

– V

IN2

)/ V

IN1

.

Note 4: R

IN

is guaranteed by design and is not tested.

R

IN

= 1/(f

S

• 33pF).

Note 5: Average supply current = t

D

• l

S(ON)

• f

S

+ (1 – t

D

x f

S

) • l

S(OFF)

.

Note 6: Response time is set by an internal oscillator and is independent

of overdrive voltage.

Note 7: Inputs and outputs also capable of meeting EIA/JEDEC B series

CMOS specifications.

TYPICAL PERFOR A CE CHARACTERISTICS

UW

Peak Supply Current

vs Supply Voltage

SUPPLY VOLTAGE, V

+

(V)

2

0

I

S(ON)

(mA)

2

6

8

10

20

14

6

10

12

LTC1040 • TPC01

4

16

18

12

4

8

14

16

25°C

125°C

–55°C

LTC1040M/LTC1040C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

STROBE Input (Note 7)

V

IH

Logic “1” Input Voltage V

+

= 5.25V ● 2.0 1.6 V

V

IL

Logic “0” Input Voltage V

+

= 4.75V 1.0 0.8 V

R

EXT

External Timing Resistor Resistor Tied Between V

+

and OSC Pin ● 100 10,000 kΩ

f

S

Sampling Frequency R

EXT

= 1M, C

EXT

= 0.1µF 5 Hz

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range otherwise specifications are at T

A

= 25°C. Test conditions: V

+

= 5V, V

–

= –5V, unless otherwise specified

Normalized Sampling Frequency

vs Supply Voltage and Temperature

SUPPLY VOLTAGE, V

+

(V)

0

(f

S

/f

S

AT 5V, 25°C)

NORMALIZED SAMPLING FREQUENCY

1.4

1.8

16

LTC1040 • TPC02

1.0

0.6

4

8

12

2

6

10

14

2.2

1.2

1.6

0.8

2.0

T

A

= 125°C

T

A

= 25°C

T

A

= –55°C

R = 1M

C = 0.1µF

Input Resistance

vs Sampling Frequency

SAMPLING FREQUENCY, f

S

(Hz)

1

10

7

AVERAGE INPUT RESISTANCE, R

IN

(1/f

S

• 33pF) (Ω)

10

9

10

11

10

2

10

4

10

3

10

LTC1040 • TPC05

10

8

10

Sampling Rate vs R

EXT

, C

EXT

R

EXT

(Ω)

100k

0.1

1

10

2

SAMPLE RATE, f

S

(Hz)

10

3

1M 10M

LT1040 • TPC03

C

EXT

= 1000pF

C

EXT

= 0.01µF

C

EXT

= 0.1µF

C

EXT

= 1µF

C

EXT

= 0.05µF

Response Time

vs Supply Voltage

SUPPLY VOLTAGE, V

+

(V)

2

RESPONSE TIME, t

D

(µs)

200

250

300

812

LTL1040 • TPC04

150

100

46

10 14 16

50

0

T

A

= 25°C

V

P-P

Output Voltage

vs Load Current

LOAD CURRENT, I

L

(mA)

0

TYPICAL OUTPUT VOLTAGE DROP, V

+

–V

P-P

(V)

0.8

0.4

0

8

LTC1040 • TPC06

1.2

1.6

2.0

0.6

0.2

1.0

1.4

1.8

21

43

67 9

5

10

V

+

= 2.8V

V

+

= 16V

V

+

= 5V

V

+

= 10V

LTC1040CSW#PBF

LTC1040CSW#PBF

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