HI7131 Просмотр технического описания (PDF) - Intersil

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Компоненты Описание

производитель

HI7131

3 1/2 Digit, Low Power, High CMRR, LCD/LED Display-Type A/D Converters

Intersil 

HI7131, HI7133

Typical Applications (Continued)

OSC 1 40

OSC 2 39

OSC 3 38

TEST 37

REF HI 36

TO PIN 1

180kΩ

50pF

SCALE

FACTOR

ADJUST

REF LO 35

CREF 34 0.1µF

CREF 33

COMMON 32

100kΩ 1MΩ

200kΩ 470kΩ

IN HI 31

IN LO 30

A-Z 29

BUFF 28

0.01µF

ZERO

ADJUST

0.47µF

390kΩ

INT 27

V - 26

0.047µF

G2 25

C3 24

A3 23

TO DISPLAY

100kΩ

SILICON NPN

MPS 3764 OR

SIMILAR

9V

G3 22

BP/GND 21

TO BACKPLANE 0V

A silicon diode-connected transistor has a temperature coefficient of about -2mV/oC. Calibration

is achieved by placing the sensing transistor in ice water and adjusting the zeroing potentiome-

ter for a 000.0 reading. The sensor should then be placed in boiling water and the scale-factor

potentiometer adjusted for a 100.0 reading. See AD590 data sheets for alternative circuits.

FIGURE 105A. HI7131 AND HI7133 USED AS A DIGITAL CENTIGRADE THERMOMETER

SCALE FACTOR ADJUST

(VREF > 100mV for AC to RMS)

TO PIN 1

OSC 1 40

OSC 2 39

OSC 3 38

TEST 37

REF HI 36

REF LO 35

CREF 34

CREF 33

COMMON 32

IN HI 31

IN LO 30

A-Z 29

BUFF 28

INT 27

V - 26

G2 25

C3 24

A3 23

G3 22

GND 21

180kΩ

50pF

10µF

0.1µF

20kΩ

180kΩ

0.47µF

180kΩ

0.047µF

TO DISPLAY

10µF

+5V

470kΩ

10kΩ

1µF

4.3K

1µF

100kΩ

+

-

AC IN

10kΩ

2.2MΩ

1µF

1µF

0.22µF

100pF (FOR OPTIMUM BAND WIDTH)

-5V

FIGURE 105B. AC TO DC CONVERTER AND HI7133 FOR RMS DISPLAY

FIGURE 105.

3-1844

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