236AC1 Просмотр технического описания (PDF) - Linear Technology

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236AC1

Precision Reference

Linear Technology 

LT1236

TYPICAL APPLICATIONS

Strain Gauge Conditioner for 350Ω Bridge

R1

357Ω

1/2W

Negative Shunt Reference Driven

by Current Source

28mA

LT1236-10

28.5mA

15V

IN

OUT

GND

3

6

LM301A†

2

1

100pF 8

5V

350Ω STRAIN

R3

GAUGE BRIDGE**

2M

R2

20k

R4

20k

2–

LT1012C

3+

6

VOUT

X100

R5

2M

R6*

2M

–5V

357Ω

1/2W

LT1236-10

OUT

GND

–10V (ILOAD ≤ 1mA)

2.5mA

LM334

27Ω

–11V TO – 40V

LT1236 TA13

–15V

*THIS RESISTOR PROVIDES POSITIVE FEEDBACK TO

THE BRIDGE TO ELIMINATE LOADING EFFECT OF

THE AMPLIFIER. EFFECTIVE ZIN OF AMPLIFIER

STAGE IS ≥ 1MΩ. IF R2 TO R5 ARE CHANGED,

SET R6 = R3

**BRIDGE IS ULTRA-LINEAR WHEN ALL LEGS ARE

ACTIVE, TWO IN COMPRESSION AND TWO IN TENSION,

OR WHEN ONE SIDE IS ACTIVE WITH ONE COMPRESSED

AND ONE TENSIONED LEG

†OFFSET AND DRIFT OF LM301A ARE VIRTUALLY

ELIMINATED BY DIFFERENTIAL CONNECTION OF LT1012C

LT1236 TA08

Precision DAC Reference with System TC Trim

2-Pole Lowpass Filtered Reference

LT1236-10

15V IN

OUT

GND

1µF

MYLAR

8.87k

1%

1.24k

1%

D1

1N457

10k

50k

1%

TC TRIM*

LT1236

VIN IN

OUT

50k

ROOM TEMP

GND

R1

R2

36k

36k

TRIM

10.36k

f = 10Hz

1%

10k

D2

200k

1%

1N457

1%

50k

1mA

8.45k

VIN

–

LT1001

+

0.5µF

MYLAR

VREF

TOTAL NOISE

≤ 2µVRMS

1Hz ≤ f ≤ 10kHz

–VREF

LT1236 TA12

*TRIMS 1mA REFERENCE CURRENT

TC BY ±40ppm/°C. THIS TRIM

SCHEME HAS VERY LITTLE EFFECT ON ROOM

TEMPERATURE CURRENT TO MINIMIZE ITERATIVE

TRIMMING

10

DAC

LT1236 TA16

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