LTC1043MJ/883_技术文档

LTC1043

Dual Precision

Instrumentation Switched Capacitor

Building Block

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FEATURES

DESCRIPTIO

The LTC^®1043 is a monolithic, charge-balanced, dual

switched capacitor instrumentation building block. A pair

of switches alternately connects an external capacitor to

an input voltage and then connects the charged capacitor

across an output port. The internal switches have a

break-before-make action. An internal clock is provided

and its frequency can be adjusted with an external

capacitor.TheLTC1043canalsobedrivenwithanexternal

CMOS clock.

■

Instrumentation Front End with 120dB CMRR

Precise, Charge-Balanced Switching

Operates from 3V to 18V

■

Internal or External Clock

Operates up to 5MHz Clock Rate

Low Power

Two Independent Sections with One Clock

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APPLICATIO S

The LTC1043, when used with low clock frequencies,

provides ultra precision DC functions without requiring

precise external components. Such functions are

differential voltage to single-ended conversion, voltage

inversion, voltage multiplication and division by 2, 3, 4, 5,

etc. The LTC1043 can also be used for precise V–F and

F–V circuits without trimming, and it is also a building

block for switched capacitor filters, oscillators and

modulators.

■

Precision Instrumentation Amplifiers

■

Ultra Precision Voltage Inverters, Multipliers

and Dividers

■

V–F and F–V Converters

■

Sample-and-Hold

■

Switched Capacitor Filters

The LTC1043 is manufactured using Linear Technology’s

enhanced LTCMOS^TMsilicon gate process.

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

LTCMOS is a trademark of Linear Technology Corporation.

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TYPICAL APPLICATIO

Instrumentation Amplifier

CMRR vs Frequency

5V

140

C

S

= C = 1µF

H

4

5V

120

100

80

8

3

7

8

+

1

1µF

1/2 LTC1013

V

OUT

C

H

2

–

11

12

4

1µF

(EXTERNAL)

DIFFERENTIAL

INPUT

–5V

C

S

60

1µF

40

13

16

17

14

20

R1

R2

100

1k

10k

100k

FREQUENCY OF COMMON MODE SIGNAL

CMRR > 120dB AT DC

CMRR > 120dB AT 60Hz

DUAL SUPPLY OR SINGLE 5V

GAIN = 1 + R2/R1

1/2 LTC1043

LTC1043 • TA02

0.01µF

LTC1043 • TA01

V

≈ 150µV

OS

∆V

–5V

OS

≈ 2µV/°C

∆T

COMMON MODE INPUT VOLTAGE INCLUDES THE SUPPLIES

1043fa

1

LTC1043

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ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

TOP VIEW

ORDER PART

NUMBER

Supply Voltage ........................................................ 18V

Input Voltage at Any Pin .......... –0.3V ≤ V_IN≤ V⁺+ 0.3V

Operating Temperature Range

LTC1043C ................................... –40°C ≤ T_A≤ 85°C

LTC1043M (OBSOLETE).............–55°C ≤ T_A≤ 125°C

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

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

1

2

3

4

5

6

7

8

9

S3B

18

17

16

15

14

13

12

11

10

SH

B

+

–

V

C

B

LTC1043CN

LTC1043CSW

–

+

C

OSC

B

S4B

S4A

V

S2B

S1B

S1A

S2A

NC

S3A

–

C

A

+

C

A

SH

A

N PACKAGE

18-LEAD PDIP

SW PACKAGE

18-LEAD PLASTIC SO

T

JMAX

T

JMAX

= 100°C, θ = 100°C/W PACKAGE (N)

JA

= 150°C, θ = 85°C/W PACKAGE (SW)

JA

D PACKAGE

18-LEAD SIDE BRAZED (HERMETIC)

LTC1043MD

OBSOLETE PACKAGE

Consider the N18 Package as an Alternate Source

LTC1043 • POI01

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

ELECTRICAL CHARACTERISTICS

The

■

denotes specifications which apply over the full operating temperature

+

–

range, otherwise specifications are at T = 25°C. V = 10V, V = 0V, LTC1043M operates from –55°C ≤ T ≤ 125°C; LTC1043C operates from

A

–40°C ≤ T ≤ 85°C, unless otherwise noted.

A

LTC1043M

LTC1043C

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX MIN TYP MAX UNITS

I

Power Supply Current

Pin 16 Connected High or Low

0.25

0.4

0.7

0.25

0.4

0.7

mA

S

■

–

C

(Pin 16 to V ) = 100pF

0.4

0.65

1

0.4

0.65

1

mA

OSC

I

OFF Leakage Current

ON Resistance

Any Switch, Test Circuit 1 (Note 2)

6

100

500

6

100

pA

nA

I

R

Test Circuit 2, V = 7V, 1 = ±0.5mA

240

400

700

240

400

700

Ω

ON

IN

+

–

V = 10V, V = 0V

ON Resistance

Test Circuit 2, V = 3.1V, 1 = ±0.5mA

400

700

1

400

700

1

Ω

kΩ

ON

IN

+

–

V

= 5V, V = 0V

–

f

I

Internal Oscillator Frequency

C

(Pin 16 to V ) = 0pF

185

34

185

34

kHz

OSC

–

(Pin 16 to V ) = 100pF

20

15

50

75

20

15

50

75

Test Circuit 3

■

+

–

Pin Source or Sink Current

Pin 16 at V or V

40

70

100

40

70

100

µA

OSC

Break-Before-Make Time

Clock to Switching Delay

Max External CLK Frequency

25

75

5

25

75

5

ns

C

Pin Externally Driven

OSC

f

Pin Externally Driven with CMOS Levels

MHz

dB

M

OSC

+

–

CMRR

Common Mode Rejection Ratio V = 5V, V = –5V, –5V < V < 5V

120

CM

DC to 400Hz

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

of a device may be impaired.

Note 2: OFF leakage current is guaranteed but not tested at 25°C.

1043fa

2

LTC1043

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TYPICAL PERFOR A CE CHARACTERISTICS ^{(Test Circuits 2 through 4)}

Power Supply Current vs

Power Supply Voltage

R_ONvs V_IN

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

550

500

450

400

350

300

250

200

150

100

280

260

240

220

200

180

160

140

120

100

+

–

V

T

= 10V

= 0V

V

T

= 5V

R

(PEAK)

R

(PEAK)

T

= –55°C

ON

A

–

= 0V

C

= 0pF

OSC

= 0.0047pF

= 25°C

C

A

OSC

I = 100µA

V

IN

T

= 25°C

= 0pF

A

C

OSC

= 0.0047pF

I = 100µA

T

C

= 125°C

A

= 0pF

I = mA

OSC

= 0.0047pF

0

2

4

6

8

10 12 14 16 18 20

0

1

2

3

4

5

0

1

2

3

4

5

6

7

8

9

10

V

(V)

V

IN

(V)

V

(V)

IN

SUPPLY

LTC1043 • TPC01

LTC1043 • TPC02

LTC1043 • TPC03

R_ON(Peak) vs Power Supply

Voltage

R_ON(Peak) vs Power Supply

Voltage and Temperature

R_ONvs V_IN

260

240

220

200

180

160

140

120

100

80

1000

900

800

700

600

500

400

300

200

100

0

1100

1000

900

800

700

600

500

400

300

200

100

+

V

T

= 15V

= 0V

= 25°C

R

(PEAK)

R

(PEAK)

R

(PEAK)

ON

V

= 1.6V

IN

–

A

I = 100µA

V

IN

I = 100µA

T = 125°C

A

V

≈ 3.2V

IN

I = mA

V

≈ 7V

IN

V

T

= 70°C

A

V

≈ 11V

IN

+

3V ≤ V + ≤18V

–

A

V

T

= 0V

= 25°C

≈ 15.1V

IN

T

= –55°C

A

0

2

4

6

8

10 12 14 16 18 20

(V)

0

2

4

6

8

10 12 14 16 18 20

(V)

0

2

4

6

8

10 12 14 16 18 20

(V)

V

SUPPLY

IN

SUPPLY

LTC1043 • TPC04

LTC1043 • TPC05

LTC1043 • TPC06

Oscillator Frequency, f_OSC

vs C_OSC

Oscillator Frequency, f_OSC

vs Supply Voltage

Normalized Oscillator Frequency,

f_OSCvs Supply Voltage

250

225

200

175

150

125

100

75

1M

2.0

1.8

1.6

1.4

1.2

1

T

A

= 25°C

T

= 25°C

0pF < C

A

< 0.01µF

OSC

A

T

= 25°C

C

= 0pF

100k

OSC

+

–

= 10V, V = 0V

V

+

–

= 5V, V = 0V

V

10k

1k

+

–

= 15V, V = 0V

V

0.8

0.6

0.4

0.2

0

50

C

= 100pF

OSC

25

100

0

2

4

6

8

V

10 12 14 16 18 20

(V)

0

2

4

6

8

10 12 14 16 18 20

(V)

0

2k

4k

6k

(pF)

8k

10k

V

C

SUPPLY

OSC

LTC1043 • TPC07

LTC1043 • TPC08

LTC1043 • TPC09

1043fa

3

LTC1043

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TYPICAL PERFOR A CE CHARACTERISTICS ^{(Test Circuits 2 through 4)}

Oscillator Frequency, f_OSC

vs Ambient Temperature, T_A

C_OSCPin I_SINK, I_SOURCE

vs Supply Voltage

Break-Before-Make Time, t_NOV

,

vs Supply Voltage

350

325

300

275

250

225

200

175

150

125

100

75

80

70

C

OSC

= 0pF

T

= 25°C

A

I

T

= –55°C

= 25°C

SINK,

A

60

I

T

A

SINK,

50

40

30

20

I

T

A

= –55°C

SOURCE,

50

I

T

= 25°C

A

SOURCE,

+

–

V

= 10V, V = 0V

25

I

T = 125°C

A

SINK,

+

–

V

= 5V, V = 0V

+

–

I

T = 125°C

SOURCE, A

V

= 15V, V = 0V

0

10

50

75 100 125

0

2

4

6

8

10 12 14 16 18

–50

0

25

–25

0

6

2

4

8

10 12 14 16 18 20

AMBIENT TEMPERATURE (°C)

V

(V)

SUPPLY

LTC1043 • TPC11

LTC1043 • TPC10

LTC1043 • TPC12

W

BLOCK DIAGRA

S1A

7

S2A

8

+

10

11

12

SH

C

A

–

A

S3A

13

S4A

14

CHARGE

BALANCING

CIRCUITRY

S1B

6

S2B

5

+

SH

1

2

3

C

B

–

B

S3B

18

S4B

15

CHARGE

BALANCING

CIRCUITRY

THE CHARGE BALANCING CIRCUITRY SAMPLES THE VOLTAGE

AT S3 WITH RESPECT TO S4 (PIN 16 HIGH) AND INJECTS A

SMALL CHARGE AT THE C PIN (PIN 16 LOW).

THIS BOOSTS THE CMRR WHEN THE LTC1043 IS USED AS AN

INSTRUMENTATION AMPLIFIER FRONT END.

FOR MINIMUM CHARGE INJECTION IN OTHER TYPES OF

APPLICATIONS, S3A AND S3B SHOULD BE GROUNDED

+

V

+

NON-OVERLAPPING

CLOCK

4

+

–

V

C

V

OSC

16

17

OSCILLATOR

–

V

THE SWITCHES ARE TIMED AS SHOWN WITH PIN 16 HIGH

LTC1043 • BD01

1043fa

4

LTC1043

TEST CIRCUITS

Test Circuit 1. Leakage Current Test

Test Circuit 2. R_ONTest

(7, 13, 6, 18)

(8, 14, 5, 15)

(7, 13, 6, 18)

(8, 14, 5, 15)

NOTE: TO OPEN SWITCHES,

S1 AND S3

A

SHOULD BE CONNECTED

+

V

–

IN

TO V . TO OPEN S2, S4,

+

0V TO 10V

C

TO V

PIN SHOULD BE

OSC

(11, 12, 2, 3)

+

C

OSC

(11, 12, 2, 3)

100µA to 1mA

CURRENT SOURCE

A

LTC1043 • TC01

LTC1043 • TC02

Test Circuit 3. Oscillator Frequency, f_OSC

Test Circuit 4. CMRR Test

7

8

V

OUT

–

V

(TEST PIN)

2

4

5

6

17

16

10

11

12

C

OSC

+

V

+

CAPACITORS ARE

NOT ELECTROLYTIC

LTC1043

1µF

+

IV

13

14

LTC1043 • TC03

+

–

+

V

≤ V ≤ V

CM

V

CM

CMRR = 20 LOG

(

)

V

OUT

NOTE: FOR OPTIMUM CMRR, THE C

SHOULD

OSC

BE LARGER THAN 0.0047µF, AND

THE SAMPLING CAPACITOR ACROSS

PINS 11 AND 12 SHOULD BE PLACED

OVER A SHIELD TIED TO PIN 10

LTC1043 • TC04

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APPLICATIO S I FOR ATIO

Common Mode Rejection Ratio (CMRR)

1/2 LTC1043

7

8

The LTC1043, when used as a differential to single-ended

converter rejects common mode signals and preserves

differential voltages (Figure 1). Unlike other techniques,

the LTC1043’s CMRR does not degrade with increasing

common mode voltage frequency. During the sampling

mode, the impedance of Pins 2, 3 (and 11, 12) should be

reasonably balanced, otherwise, common mode signals

will appear differentially. The value of the CMRR depends

on the value of the sampling and holding capacitors

(C_S, C_H) and on the sampling frequency. Since the

common mode voltages are not sampled, the

common mode signal frequency can well exceed the

sampling frequency without experiencing aliasing

phenomena. The CMRR of Figure 1 is measured by

+

C

11

12

+

V

C

V

D

C

H

D

S

–

C

13

14

V

CM

C

S,

C ARE MYLAR OR POLYSTRENE

H

LTC1043 • AI01

Figure 1. Differential to Single-Ended Converter

1043fa

5

LTC1043

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APPLICATIO S I FOR ATIO

shorting Pins 7 and 13 and by observing, with a precision

DVM, the change of the voltage across C_Hwith respect to

an input CM voltage variation. During the sampling and

holding mode, charges are being transferred and minute

voltage transients will appear across the holding capaci-

tor. Although the R_ONon the switches is low enough to

allow fast settling, as the sampling frequency increases,

the rate of charge transfer increases and the average

voltage measured with a DVM across it will increase

proportionally; this causes the CMRR of the sampled data

system, as seen by a “continuous” instrument (DVM), to

decrease (Figure 2).

Shielding the Sampling Capacitor for Very High CMRR

Internal or external parasitic capacitors from the C⁺pin(s)

to ground affect the CMRR of the LTC1043 (Figure 1).

The common mode error due to the internal junction

capacitancesoftheC⁺Pin(s)2and11iscancelledthrough

internal circuitry. The C⁺pin, therefore, should be used as

the top plate of the sampling capacitor. The interpin

capacitance between pin 2 and dummy Pin 1 (11 and 10)

appears in parallel with the sampling capacitor so it does

not degrade the CMRR. A shield placed underneath

the sampling capacitor and connected to either Pin 1 or 3

helps to boost the CMRR in excess of 120dB (Figure 5).

Switch Charge Injection

Excessive external parasitic capacitance between the C^–

pins and ground indirectly degrades CMRR; this becomes

visible especially when the LTC1043 is used with clock

frequencies above 2kHz. Because of this, if a shield is

used, the parasitic capacitance between the shield and

circuit ground should be minimized.

Figure 3 shows one out of the eight switches of the

LTC1043, configured as a basic sample-and-hold circuit.

When the switch opens, a ‘‘hold step’’ is observed and its

magnitude depends on the value of the input voltage.

Figure4showschargeinjectedintotheholdcapacitor. For

instance, a2pCbofchargeinjectedintoa0.01µFcapacitor

causes a 200µV hold step. As shown in Figure 4, there is

a predictable and repeatable charge injection cancellation

when the input voltage is close to half the supply voltage

of the LTC1043. This is a unique feature of this product,

containing charge-balanced switches fabricated with a

self-aligning gate CMOS process. Any switch of the

LTC1043, when powered with symmetrical dual supplies,

will sample-and-hold small signals around ground with-

out any significant error.

It is recommended that the outer plate of the sampling

capacitor be connected to the C^–pin(s).

Input Pins, SCR Sensitivity

An internal 60Ω resistor is connected in series with the

input of the switches (Pins 5, 6, 7, 8, 13, 14, 15, 18) and

it is included in the R_ONspecification. When the input

voltage exceeds the power supply by a diode drop, current

will flow into the input pin(s). The LTC1043 will not latch

until the input current reaches 2mA–3mA. The device will

140

C

= C = 1µF

H

S

5V

120

100

80

C

= 1µF, C = 0.1µF

ZH

S

2

6

+

V

1/2 LTC1013

OUT

1/8 LTC1043

1000pF

–

V

IN

–5V

60

SAMPLE

+

V

40

HOLD TO PIN 16

0V

LTC1043 • AI03

20

100

1k

10k

100k

f

(Hz)

OSC

LTC1043 • AI02

Figure 2. CMRR vs Sampling Frequency

Figure 3

1043fa

6

LTC1043

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APPLICATIO S I FOR ATIO

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recoverfromthelatchmodewhentheinputdrops3Vto4V

below the voltage value which caused the latch. For

instance, if an external resistor of 200Ω is connected in

series with an input pin, the input can be taken 1.3V above

thesupplywithoutlatchingtheIC.Thesameappliesforthe

C⁺and C^–pins.

with an external clock to override the internal oscillator.

Although standard 7400 series CMOS gates do not

guarantee CMOS levels with the current source and sink

requirements of Pin 16, they will in reality drive the Cosc

pin. CMOS gates conforming to standard B series output

drive have the appropriate voltage levels and more than

enough output current to simultaneously drive several

LTC1043 C_OSCpins. The typical trip levels of the Schmitt

trigger (Figure 6) are given below.

C

_OSCPin (16), Figure 6

The Cosc pin can be used with an external capacitor, Cosc,

connected from Pin 16 to Pin 17, to modify the internal

oscillator frequency. If Pin 16 is floating, the internal 24pF

capacitor, plus any external interpin capacitance, set the

oscillator frequency around 190kHz with ±5V supply. The

typical performance characteristics curves provide the

necessary information to set the oscillator frequency for

various power supply ranges. Pin 16 can also be driven

SUPPLY

TRIP LEVELS

V = 3.4VV = 1.35V

H

+

–

V = 5V, V = 0V

L

+

–

V = 10V, V = 0V

V = 6.5VV = 2.8V

H L

+

–

V = 15V, V = 0V

V = 9.5VV = 4.1V

H

L

12

+

–

V

= 15V

= 0V

10

8

+

–

V

= 10V

= 0V

6

1

OUTSIDE FOIL

4

+

V

–

V

C

S

2

3

= 5V

= 0V

2

0

PRINTED CIRCUIT

BOARD AREA

10 12

0

2

4

6

8

14 16

LTC1043

V

(V)

IN

LTC1043 • AI05

LTC1043 • AI04

Figure 5. Printed Circuit Board Layout

Showing Shielding the Sampling Capacitor

Figure 4. Individual Switch Charge Injection

vs Input Voltage

+

V

4

38µF

C

OSC

16

TO CLK GENERATOR

C

OSC

(EXTERNAL)

24pF

17

–

V

(24pF)

(24pF + C

f

= 190kHz •

OSC

)

OSC

LTC1043 * AI06

Figure 6. Internal Oscillator

1043fa

7

LTC1043

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TYPICAL APPLICATIO S

Divide by 2

Multiply by 2

Ultra Precision Voltage Inverter

1/2 LTC1043

V

OUT

= –V

IN

1/2 LTC1043

7

8

V

IN

7

8

V

7

8

V

= V /2

IN

V

IN

OUT

1µF

11

12

11

12

11

1µF

12

V

13

16

14

17

IN

13

16

14

17

13

16

14

17

0.01µF

V

= –V ±2ppm

OUT

–

+

IN

+

V

= V /2 ± 1ppm

V

= 2V ± 5ppm

< V < V

OUT

IN

OUT

IN

+

–

0 ≤ V ≤ V

3 ≤ V ≤ 18V

0 ≤ V ≤ V /2

3 ≤ V ≤ 18V

= +5V, V = –5V

IN

+

LTC1043 * A03

LTC1043 • A01

LTC1043 • A02

Precision Multiply by 3

Precision Multiply by 4

Divide by 3

V

IN

LTC1043

V

IN

7

8

7

8

7

8

V

IN

11

12

11

12

11

1µF

12

13

6

14

5

13

6

13

6

14

5

14

5

V

OUT

V

OUT

2V

IN

1µF

V

OUT

= 4V

IN

2

3

2

3

2

1µF

3

V

18

16

15

17

18

17

OUT

18

16

15

17

15

16

1µF

0.01µF

V

= 3V ±10ppm

V

= 4V ±40ppm

V

= V /3 ±3ppm

IN

OUT

IN

OUT

IN

OUT

IN

+

0 < V < V /3

3V

0 ≤ V ≤ V /4

3V

0 ≤ V ≤ V

IN

+

<

18V

LTC1043 • A06

V

18V

LTC1043 • A04

V

LTC1043 • A05

1043fa

8

LTC1043

U

TYPICAL APPLICATIO S

Divide by 4

0.005% V/F Converter

LT1009

2.5k

–5V

1k

LTC1043

V

IN

7

8

17

5V

1/2 LTC1043

11

1µF

8

7

1µF

12

1µF

11

12

f : 0kHz TO 30kHz

OUT

14

13

16

13

6

14

5

4

5V

0.01µF

GAIN

2.5k

6.19k

V

IN

0V TO 3V

V

OUT

–

1µF

LF356

–5V

+

2

1µF

3

1µF

30pF

22k

330k

18

16

15

17

Q1

2N2907A

1µF

0.01µF

–5V

LTC1043 • A08

+

0 ≤ V ≤ V

IN

V

OUT

= V /4 ±5ppm

IN

LTC1043 • A07

0.01% Analog Multiplier

1/4 LTC1043

1k

1µF

–5V

14

5V

13

LT1004-1.2V

20k

12

OUTPUT

TRIM

0.001µF^†

80.6k*

7.5k*

7

2

3

Y

INPUT

–

+

0.01µF

6

LT1056

1µF

16

6

4

5V

1/4 LTC1043

–5V

2

7

X

INPUT

–

5

6

OUTPUT

XY ±0.01%

LT1056

30pF

3

330k

22k

+

4

2

OPERATE LTC1043 FROM ±5V

^†POLYSTYRENE, MOUNT CLOSE

0.001µF^†

–5V

2N2907A

*

1% FILM RESISTOR

(FOR START-UP)

ADJUST OUTPUT TRIM

SO X • Y = OUTPUT ±0.01%

1µF

–5V

LTC1043 • A09

1043fa

9

LTC1043

U

TYPICAL APPLICATIO S

Single 5V Supply, Ultra Precision

Voltage Controlled Current Source with

Ground Referred Input and Output

Instrumentation Amplifier

5V

8

3

2

INPUT

0V TO 2V

LTC1043

+

7

3

2

1

7

8

+

–

1/2 LT1013

6

OUTPUT

= 1000

LTC1052

1

A

–

V

8

4

11

12

4

0.1µF 0.1µF

1µF

INPUT

0.68µF

99.9k

100Ω

5V

4

–

13

6

14

5

1k

43k

+

V

= 5V

8

7

0.22µF

10k

2

3

11

12

1µF

1N914

1µF

100Ω

NONPOLARIZED

1µF

18

16

15

14

17

13

16

≈ –0.5V

V

IN

1/2 LTC1043

1

OUT

=

100Ω

17

4

INPUT AND OUTPUT VOLTAGE RANGE INCLUDES GROUND.

INPUT REFERRED OFFSET ERRORS ARE TYPICALLY 3µV WITH

1µV OF NOISE

5V

~

CMRR ~ 120dB

0.0047

0.001µF

LTC1043 • A10

OPERATES FROM A SINGLE 5V SUPPLY

LTC1043 • A11

Precision Instrumentation Amplifier

5V

CHOPPER

1/4 LTC1043

AC AMPLIFIER

5V

PHASE

SENSITIVE

DEMODULATOR

DC

OUTPUT AMPLIFIER

1µF

4

1/2 LTC1043

1µF

+ INPUT

6

5

7

3

2

7

1/4 LTC1043

1µF

11

+

5V

6

13

LT1056

100k

2

3

7

1M

8

12

2

–

+

–

4

6

100k 100k

OUTPUT

LT1056

1µF

14

–5V

4

3

–5V

100Ω

R2

100k

– INPUT

18

16

15

17

0.01

OFFSET = 10µV

R1

100Ω

–5V

DRIFT = 0.1µV/°C

0.01µF

FULL DIFFERENTIAL INPUT

CMRR = 140dB

OPEN LOOP GAIN > 10⁸

GAIN = R2/R1 + 1

I

= 1nA

BIAS

LTC1043 • A12

1043fa

10

LTC1043

U

TYPICAL APPLICATIO S

Lock-In Amplifier (= Extremely Narrow-Band Amplifier)

THERMISTOR BRIDGE

IS THE SIGNAL SOURCE

SYNCHRONOUS

DEMODULATOR

10k*

5V

T1

500Hz

5V

SINE DRIVE

6.19k

4

1

3

2

3

2

–

+

–

5V

1/4 LTC1043

6

LM301A

1

13

LT1007

–5V

8

2

3

RT

–

+

12

16

1M

6

V

= 1000 • DC

OUT

BRIDGE SIGNAL

100k

LT1012

–5V

14

4

30pF

1µF

–5V

100Ω

+

T1 = TF5SX17ZZ, TOROTEL

0.01µF

47µF

R

= YSI THERMISTOR 44006

T

≈ 6.19k AT 37.5°C

*

MATCH 0.05%

6.19k = VISHAY S-102

OPERATE LTC1043 WITH

±5V SUPPLIES

PHASE TRIM

0.002

5V

50k

10k

5V

LOCK-IN AMPLIFIER TECHNIQUE

USED TO EXTRACT VERY SMALL

SIGNALS BURIED INTO NOISE

1k

2

8

+

–

7

LT1011

1

LTC1043 • A013

3

4

–5V

ZERO CROSSING DETECTOR

50MHz Termal RMS/DC Converter

5V

4

5V

30k*

10k

1/2 LTC1043

3

2

8

5V

CALIBRATION ADJUST

20k

6

5

+

–

1

5

LT1013

4

+

–

7

DC OUTPUT

0V TO 3.5V

2

LT1013

100k*

6

1µF

10k

16

15

3

0.01µF

301Ω*

10k

18

0.01µF

300mV

10V

RMS

INPUT

17

BRN

RED

T2A

GRN

N

T2

GRN

1A

T1B

T2B

2% ACCURACY DC 50MHZ

100:1 CREST FACTOR CAPABILITY

T1 TO T2 = YELLOW SPRINGS INST. CO.

THERMISTOR COMPOSITE

ENCLOSE T1 AND T2 IN STYROFOAM

LTC1043 • A14

*1% RESISTOR

1043fa

11

LTC1043

U

TYPICAL APPLICATIO S

Quad Single 5V Supply, Low Hold Step, Sample-and-Hold

5V

2

3

13

12

4

–

1

14

OUTPUT

1/4 LT1014

7

8

6

5

NC

+

11

C

L

0.01µF

L

11

2

0.01µF

V

IN

6

9

–

7

8

OUTPUT

1/4 LT1014

5

10

13

14

18

16

15

NC

+

C

L

12

V

3

0.01µF

V

HOLD

IN

LTC1043 • A15

17

4

SAMPLE

– 5V

FOR 1V ≤ V ≤ 4V, THE HOLD STEP IS ≤ 300µV

IN

ACQUISITION TIME ~ 8 • R

C FOR 10-BIT ACCURACY

H

ON

LTC1043 • A16

Single Supply Precision Linearized Platinum RTD Signal Conditioner

250k*

(LINEARITY CORRECTION LOOP)

5V

10k*

5V

3

2

8

2.4k

+

1

1/2 LT1013

2.74k*

LT1009

2.5V

–

4

50k

ZERO

ADJUST

8.25k*

0.1µF

4

2k

0V TO 4V = 0°C TO 400°C

±0.05°C

1/2 LTC1043

5

6

7

8

5

6

+

7

1/2 LT1013

1k

5k

–

GAIN

11

2

ADJUST

1µF

887Ω

1µF

8.06k*

12

3

1k*

13

15

16

14

1mA

18

17

R

100Ω

AT 0°C

p

R

p

= ROSEMOUNT 118MFRTD

*1% FILM RESISTOR

TRIM SEQUENCE:

0.01µF

SET SENSOR TO 0°C VALUE. ADJUST ZERO FOR 0V OUT

SET SENSOR TO 100°C VALUE. ADJUST GAIN FOR 1,000V OUT

SET SENSOR TO 400°C VALUE. ADJUST LINEARITY FOR 4,000V OUT

LTC1043 • A17

REPEAT AS REQUIRED

1043fa

12

LTC1043

U

TYPICAL APPLICATIO S

0.005% F/V Converter

10k

GAIN TRIM

75k*

1µF

1/4 LTC1043

14

5V

1k

13

–5V

–

1µF

LT1004-1.2C

0V TO 3V OUTPUT

LF356

+

12

–5V

1000pF

5V

4

*75k = TRW # MTR-5/120ppm

FREQUENCY IN

0kHz TO 30kHz

–5V

16

17

LTC1043 • A18

High Frequency Clock Tunable Bandpass Filter

R1

10k

R2

10k

5V

R

IN

V

–

IN

1/2 LTC1043

7

8

LT1056

+

–5V

11

12

CLOCK

INPUT

1000pF

5V

16

13

200pF

BANDPASS

OUTPUT

5V

4

14

–

+

1/2 LTC1043

5

6

LT1056

R

= 10k

Q

–5V

2

1000pF

5V

200pF

3

f

CLK

R2

R1

BANDPASS CENTER FREQUENCY f

=

•

O

31.4

BANDPASS GAIN AT f IS: R /R

O

Q

IN

15

R

R2

18

–

+

Q

R2

R1

Q =

LT1056

f

Q

≤ 100kHz

AT 100kHz f IS ≤10

O MAX

MAX

(f • Q) MAX ≤ 1MHz

CLK MAX

17

O

–5V

f

≤ 3MHz, Q < 2

LTC1043 • A19

1043fa

13

LTC1043

U

TYPICAL APPLICATIO S

Frequency-Controlled Gain Amplifier

1/2 LTC1043A

1/2 LTC1043B

13B

14B

13A

14A

12A

0.01µF

11A

12B

100pF

11B

16B

7B

16A

7A

GAIN CONTROL

0kHz TO 10kHz = GAIN 0 TO 1000

8B

8A

V

IN

5V

0.01µF

7

2

–

6

V

OUT

LT1056

3

+

4

FOR DIFFERENTIAL INPUT, GROUND PIN 8A AND USE PINS 13A AND 7A FOR INPUTS

• 0.01µF

–5V

f

IN

1kHz • 100pF

GAIN =

; GAIN IS NEGATIVE AS SHOWN

FOR SINGLE-ENDED INPUT AND POSITIVE GAIN, GROUND PIN 8A AND USE PIN 7A FOR INPUT

USE ±5V SUPPLIES FOR LTC1043

LTC1043 • A20

Relative Humidity Sensor Signal Conditioner

0.01µF

1/4 LTC1043

8

7

16

17

–5V

11

470k

1k*

100pF

5V

7

1/4 LTC1043

500

90%

RH TRIM

2

3

13

14

–

10k

6

3

2

LT1056

+

–

6

OUTPUT

0V TO 1V = 0% TO 100%

LM301A

1

+

12

4

8

–5V

1µF

LT1004

1.2V

9k*

SENSOR

22M

100pF

10k

5% RH TRIM

33k

* = 1% FILM RESISTOR

SENSOR = PANAMETRICS # RHS

≈ 500pF AT RH = 76%

1.7 pF/%RH

1k*

LTC1043 • A21

1043fa

14

LTC1043

U

TYPICAL APPLICATIO S

Linear Variable Differential Transformer (LVDT), Signal Conditioner

1/4 LTC1043

0.005µF

7

4

8

30k

5V

11

RD-BLUE

30k

8

3

2

+

–

1.5kHz

1

LT1013

YEL-BLK

4

100k

5

6

+

–5V

OUTPUT

0V ±2.5V

0M 2.50M

BLUE

GRN

7

AMPLITUDE STABLE

SINE WAVE SOURCE

1/2 LT1013

1µF

10k

–

1N914

200k

4.7k

YEL-RED

LT1004

1.2V

BLK

Q1

2N4338

10k GAIN TRIM

LVDT

12

+

7.5k

1.2k

10µF

–5V

17

14

13

1/4 LTC1043

LVDT = SCHAEVITZ E-100

5V

100k

0.01µF

1k

3

2

8

+

–

7

100k

PHASE

TRIM

LT1011

TO PIN 16, LTC1043

1

4

–5V

LTC1043 • A22

Precision Current Sensing in Supply Rails

I

IN

SHUNT CAN BE IN POSITIVE

OR NEGATIVE SUPPLY LEAD

R

SHUNT

1/2 LTC1043

V

7

8

OUT

11

+

1µF

12

13

16

14

17

0.01µF

LTC1043 • A23

1043fa

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-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

15

LTC1043

U

PACKAGE DESCRIPTIO

D Package

18-Lead Side Brazed (Hermetic)

(Reference LTC DWG # 05-08-1210)

.165

.910

(23.114)

MAX

.485

(4.191)

MAX

(12.319)

MAX

.005

(0.127)

MIN

.020 – .060

(0.508 – 1.524)

17

18

16

15

14

13

12

11

10

.290

(7.366)

TYP

.008 – .015

(0.203 – 0.381)

PIN NO. 1

IDENT

.100

(2.54)

BSC

.054

(1.372)

TYP

.125

(3.175)

MIN

.300

(7.620)

REF

9

1

2

3

4

5

6

7

8

.015 – .023

(0.381 – 0.584)

D18 0801

OBSOLETE PACKAGE

N Package

18-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

.900*

.130 ± .005

.300 – .325

.045 – .065

(22.860)

MAX

(7.620 – 8.255)

(3.302 ± 0.127)

(1.143 – 1.651)

18

17

16

15

14

13

12

11

10

.020

(0.508)

MIN

.065

(1.651)

TYP

.008 – .015

(0.203 – 0.381)

.255 ± .015*

(6.477 ± 0.381)

+.035

–.015

.325

.120

(3.048)

MIN

.018 ± .003

(0.457 ± 0.076)

.005

(0.127)

MIN

.100

(2.54)

BSC

+0.889

8.255

1

2

3

5

6

9

4

7

8

(

)

–0.381

NOTE:

INCHES

N18 1002

1. DIMENSIONS ARE

MILLIMETERS

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

SW Package

18-Lead Plastic Small Outline (Wide .300 Inch)

(Reference LTC DWG # 05-08-1620)

.050 BSC .045 ±.005

.030 ±.005

TYP

.447 – .463

(11.354 – 11.760)

NOTE 4

N

14 13

11

15

12

10

18 17 16

N

.325 ±.005

.420

MIN

.394 – .419

(10.007 – 10.643)

NOTE 3

1

2

3

N/2

NOTE:

1. DIMENSIONS IN

N/2

9

INCHES

(MILLIMETERS)

RECOMMENDED SOLDER PAD LAYOUT

2. DRAWING NOT TO SCALE

3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES

ON THE BOTTOM OF PACKAGES ARE THE

MANUFACTURING OPTIONS.

.291 – .299

(7.391 – 7.595)

NOTE 4

2

3

5

7

8

1

4

6

.037 – .045

THE PART MAY BE SUPPLIED WITH OR

WITHOUT ANY OF THE OPTIONS

4. THESE DIMENSIONS DO NOT INCLUDE

MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT

EXCEED .006" (0.15mm)

.093 – .104

.010 – .029

(0.254 – 0.737)

(0.940 – 1.143)

× 45°

(2.362 – 2.642)

.005

(0.127)

RAD MIN

0° – 8° TYP

.050

(1.270)

BSC

.004 – .012

(0.102 – 0.305)

.009 – .013

(0.229 – 0.330)

NOTE 3

.014 – .019

.016 – .050

(0.356 – 0.482)

TYP

(0.406 – 1.270)

S18 (WIDE) 0502

1043fa

LW/TP 1202 1K REV A • PRINTED IN USA

16 ^{LinearTechnology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

■

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

 LINEAR TECHNOLOGY CORPORATION 1985


型号：	LTC1043MJ/883
厂家：	Linear
描述：	LTC1043MJ/883
文件：	总16页 (文件大小：227K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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