Материал: TC7106

FEATURES

GENERAL DESCRIPTION

■ Internal Reference with Low Temperature Drift

TC7106/7 .......................................

80ppm/°C Typical

TC7106A/7A ..................................

20ppm/°C Typical

■ Low Power Operation

..................................... 10mW

ORDERING INFORMATION

PART CODE

TC710X X X XXX

Package

Temperature

Code

Package

Pin Layout

Range

CKW

44-Pin PQFP

Formed Leads

0°C to +70°C

CLW

44-Pin PLCC

—

0°C to +70°C

CPL

40-Pin PDIP

Normal

0°C to +70°C

IPL

40-Pin PDIP

Normal

– 25°C to +85°C

IJL

40-Pin CerDIP

Normal

– 25°C to +85°C

40-Pin Plastic DIP

40-Pin CERDIP

44-Pin Plastic Quad Flat

44-Pin Plastic Chip

Package Formed Leads

Carrier PLCC

The TC7106A and TC7107A 3-1/2 digit direct-display

drive analog-to-digital converters allow existing 7106/7107

based systems to be upgraded. Each device has a preci-

sion reference with a 20ppm/°C max temperature coeffi-

cient. This represents a 4 to 7 times improvement over

similar 3-1/2 digit converters. Existing 7106 and 7107 based

3

systems may be upgraded without changing external pas-

sive component values. The TC7107A drives common

anode light emitting diode (LED) displays directly with 8mA

per segment. A low-cost, high-resolution indicating meter

requires only a display, four resistors, and four capacitors.

The TC7106A low power drain and 9V battery operation

make it suitable for portable applications.

4

The TC7106A/TC7107A reduces linearity error to less

than 1 count. Rollover error – the difference in readings for

equal magnitude but opposite polarity input signals – is

ing with a zero-volts input.

5

0.1 F

34

33

LCD DISPLAY (TC7106/A) OR

COMMON ANODE LED

1MΩ

31

CREF+

CREF–

SEGMENT

DISPLAY (TC7107/A)

+

V+

2–19

ANALOG

0.01 F

IN

22–25

DRIVE

6

INPUT

VIN–

20

30

POL

–

MINUS SIGN

BACKPLANE

21

32

ANALOG

BP

DRIVE

1

COMMON

V+

28

TC7106/A

24kΩ

V

+

47kΩ

BUFF

TC7107/A

36

VREF

1kΩ

9V

0.47 F

+

CAZ

VREF

29

V–REF

35

100mV

0.22 F

27

VINT

V–

26

OSC2

OSC3

OSC1

TO ANALOG

7

39

38

COSC 40

COMMON (PIN 32)

R

OSC

100pF

3 CONVERSIONS/SEC

200mV FULL SCALE

100kΩ

Supply Voltage (V+ to V–) ...........................................

15 V

Analog Input Voltage (either input) (Note 1)

......... V+ to V–

Reference Input Voltage (either input) .................

V+ to V–

Clock Input ........................................................

Test to V+

Package Power Dissipation (Note 2) (TA ≤ 70°C)

CerDIP ..............................................................

2.29W

Plastic DIP ........................................................

1.23W

PLCC ................................................................

1.23W

PQFP ................................................................

1.00W

Operating Temperature

0 ° C to +70°C

“C” Devices ............................................

“I” Devices ........................................

– 25°C to +85°C

Storage Temperature ............................

– 65°C to +150°C

Lead Temperature (Soldering, 60 sec) ...................

300°C

V+ ................................................................................................

+6 V

V– ...............................................................................................

– 9 V

Analog Input Voltage (either input) (Note 1)

......... V+ to V–

Reference Input Voltage (either input) .................

V+ to V–

Clock Input .......................................................

GND to V+

Power Dissipation (Note 2) (TA ≤ 70°C)

40-Pin CerDIP Package ...................................

2.29W

40-Pin Plastic DIP .............................................

1.23W

44-Pin PLCC .....................................................

1.23W

44-Pin PQFP ....................................................

1.00W

Operating Temperature

0 ° C to +70°C

“C” Devices ............................................

“I” Devices ........................................

– 25°C to +85°C

Storage Temperature ............................

– 65°C to +150°C

Lead Temperature (Soldering, 10 sec) .................

+300°C

Parameters

Test Conditions

TC7106/A & TC7107/A

Unit

Min

Typ

Max

Analog Common Voltage

25kΩ Between Common

2.7

3.05

3.35

V

(With Respect to Pos. Supply)

and Pos. Supply

Temp. Coeff. of

25kΩ Between Common

Analog Common

and Pos. Supply

(With Respect

0°C ≤ TA ≤ +70°C

7106A/7A

20

50

ppm/°C

to Pos. Supply)

("C", Commercial Temp. Range Devices)

7106/7

80

—

ppm/°C

Temp. Coeff. of

25kΩ Between Common

Analog Common

and Pos. Supply

(With Respect

– 25°C ≤ TA ≤ 85°C

—

—

75

ppm/°C

to Pos. Supply)

(“I,” Industrial Temp. Range Devices)

TC7106A ONLY Pk – Pk

V+ to V– = 9V

4

5

6

V

Segment Drive Voltage (Note 5)

TC7106A ONLY Pk – Pk

V+ to V– = 9V

4

5

6

V

Backplane Drive Voltage (Note 5)

TC7107A ONLY

V+ = 5.0V

5

8.0

—

mA

Segment Sinking Current (Except Pin 19)

Segment Voltage = 3V

TC7107A ONLY

V+ = 5.0V

10

16

—

mA

Segment Sinking Current (Pin 19)

Segment Voltage = 3V

Pin No.

Pin No.

40-Pin PDIP

40-Pin PDIP

(Normal)

(Reverse)

Symbol

Description

1

(40)

V+

Positive supply voltage.

2

(39)

D1

Activates the D section of the units display.

3

(38)

C1

Activates the C section of the units display.

4

(37)

B1

Activates the B section of the units display.

5

(36)

A1

Activates the A section of the units display.

6

(35)

F1

Activates the F section of the units display.

7

(34)

G1

Activates the G section of the units display.

8

(33)

E1

Activates the E section of the units display.

9

(32)

D2

Activates the D section of the tens display.

10

(31)

C2

Activates the C section of the tens display.

11

(30)

B2

Activates the B section of the tens display.

12

(29)

A2

Activates the A section of the tens display.

13

(28)

F2

Activates the F section of the tens display.

14

(27)

E2

Activates the E section of the tens display.

15

(26)

D3

Activates the D section of the hundreds display.

16

(25)

B3

Activates the B section of the hundreds display.

17

(24)

F3

Activates the F section of the hundreds display.

18

(23)

E3

Activates the E section of the hundreds display.

19

(22)

AB4

Activates both halves of the 1 in the thousands display.

20

(21)

POL

Activates the negative polarity display.

21

(20)

BP

LCD Backplane drive output (TC7106A).

GND

Digital ground (TC7107A).

22

(19)

G3

Activates the G section of the hundreds display.

23

(18)

A3

Activates the A section of the hundreds display.

24

(17)

C3

Activates the C section of the hundreds display.

25

(16)

G2

Activates the G section of the tens display.

26

(15)

V–

Negative power supply voltage.

27

(14)

VINT

Integrator output. Connection point for integration capacitor. See

INTEGRATING CAPACITOR section for more details

28

(13)

VBUFF

Integration resistor connection. Use a 47kΩ resistor for a 200mV full-

scale range and a 470kΩ resistor for 2V full-scale range.

29

(12)

CAZ

The size of the auto-zero capacitor influences system noise. Use a

0.47μF capacitor for 200mV full scale, and a 0.047μF capacitor for

2V full scale. See Paragraph on AUTO-ZERO CAPACITOR for more

details.

30

(11)

V IN–

The analog LOW input is connected to this pin.

31

(10)

V +IN

The analog HIGH input signal is connected to this pin.

32

(9)

ANALOG

This pin is primarily used to set the analog common-mode voltage

COMMON

for battery operation or in systems where the input signal is

referenced to the power supply. It also acts as a reference voltage

source. See paragraph on ANALOG COMMON for more details.

33

(8)

C–REF

See pin 34.