3

TC811

TC811-7 11/5/96

© 2001 Microchip Technology Inc.

DS21472A

3-1/2 Digit Analog-To-Digital Converter with

Hold and Differential Reference Inputs

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Scale Factor Temperature

—

1

5

ppm/

°C

Coefficient

Analog Common Section

Analog Common

250K

Ω from V+ to Analog Common

—

—

—

—

Temperature Coefficient

0

—

—

—

"C" Commercial

—

35

75

ppm/

°C

"I" Industrial

—

35

100

ppm/

°C

Analog Common Voltage

250k

Ω from V+ to Analog Common

2.7

3.05

3.35

Volts

Hold Pin Input Section

Input Resistance

Pin 1 to Pin 37

—

70

—

k

Ω

Input Low Voltage

Pin 1

—

—

Test +1.5

V

Input High Voltage

Pin 1

—

—

V

LCD Segment Drive Voltage

4

5

6

LCD Backplane Drive Voltage

4

5

6

Power Supply

Power Supply Current

—

—

—

—

—

70

100

µA

—

90

125

µA

NOTES: 1. Input voltages may exceed supply voltages when input current is limited to 100

µA.

2. Dissipation rating assumes device is mounted with all leads soldered to a printed circuit board.

3. Backplane drive is in phase with the segment drive for "segment off" 180

° out of phase for "segment on." Frequency is 20 times the

conversion rate. Average DC component is less than 50mV.

V+

NORMAL PIN

CONFIGURATION

10's

100's

1000's

100's

TC811CPL

(40-PIN PDIP)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

1's

D2

C2

B2

A2

F2

E2

D3

B3

F3

E3

AB4

POL

(MINUS SIGN)

D1

C1

B1

A1

F1

G1

E1

10's

OSC

TEST

V

ANALOG

COMMON

CAZ

OSC2

HLDR

+

REF

V

–

REF

C

+

REF

C

–

REF

V

+

IN

V

–

IN

VBUFF

VINT

V –

G

C

A

G

BP

(BACKPLANE)

3

3

3

2

1

NC = NO INTERNAL CONNECTION

27

28

29

30

31

32

33

7

4

3

2

1

NC

TC811CKW

(PQFP)

12

13

14

15

17

18

G

44

43

42

41

39

38

40

16

37

36

35

34

19

20

21

22

26

8

25

9

24

10

23

11

5

6

C

V

TEST

NC

NC

HLDR

+

NC

OSC2

OSC1

2

3

A3

G3

BP

POL

AB4

E3

F3

B3

D1

C1

B1

PIN CONFIGURATIONS