Elenco Digital Mulitmeter Kit Manual do Utilizador descarregar pdf (Página 14)

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Figure 2

7106 IC Functions

Figure 3

a

b

a

b

c

d

e

f

g

TYPICAL SEGMENT OUTPUT

0.5mA

2mA

V+

Segment

Output

Internal Digital Ground

LCD PHASE DRIVER

LATCH

7 Segment

Decode

7 Segment

Decode

7 Segment

Decode

Thousand

Hundreds

Tens Units

*

CLOCK

To Switch Drivers

From Comparator Output

-4

LOGIC CONTROL

Internal Digital Ground

200

BACKPLANE

28

V+

TEST

V

500Ω

3

8

6.2V

1V

* Three inverters.

One inverter shown for clarity.

7

6

4

OSC 1

OSC 2

OSC 3

DIGITAL SECTION

ANALOG SECTION of 7106

C

REF

R

INT

C

AZ

C

INT

INT

C

REF

+

REF HI

REF LO

C

REF

BUFFER

V+

35

42 44 43

41

36

37

1

AUTO

ZERO

+

A-Z &

Z1

A-Z &

Z1

A-Z

DE (+)

DE (+)

DE (-)

DE (-)

IN HI

COMMON

IN LO

40

39

INT

10μA

V+

38

INT

+

+

+

2.8V

A-Z & DE(+

)

& Z1

34

V

Z1

6.2V

A-Z

COMPARATOR

ZERO

CROSSING

DETECTOR

POLARITY

FLIP/FLOP

TO

DIGITAL

SECTION

INTEGRATOR

+ REF

(Flying

Capacitor)

Unknown

Input

Voltage +

Read

Integ.

AZ

AZ

Integ.

To

Digital

Control

Logic

AZ Integ. Read

AZ

+

.20

.15

.10

.05

0

10000

160ms

Counter Output

0

500 1000 1500 2000

DUAL SLOPE A/D CONVERTER

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20

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