TC7116ARCPL_技术文档

TC7116/A/TC7117/A

3-1/2 Digit Analog-to-Digital Converters with Hold

Features:

General Description:

• Low Temperature Drift Internal Reference:

- TC7116/TC7117 80 ppm/°C, Typ.

- TC7116A/TC7117A 20 ppm/°C, Typ.

• Display Hold Function

The TC7116A/TC7117A are 3-1/2 digit CMOS Analog-

to-Digital Converters (ADCs) containing all the active

components necessary to construct a 0.05% resolution

measurement system. Seven-segment decoders,

polarity and digit drivers, voltage reference, and clock

circuit are integrated on-chip. The TC7116A drives

Liquid Crystal Displays (LCDs) and includes a back-

plane driver. The TC7117A drives common anode Light

Emitting Diode (LED) displays directly with an 8mA

drive current per segment.

• Directly Drives LCD or LED Display

• Zero Reading with Zero Input

• Low Noise for Stable Display:

- 2V or 200mV Full Scale Range (FSR)

• Auto-Zero Cycle Eliminates Need for Zero

• Adjustment Potentiometer

These devices incorporate a display hold (HLDR)

function. The displayed reading remains indefinitely, as

long as HLDR is held high. Conversions continue, but

output data display latches are not updated. The refer-

ence low input (V_REF-) is not available, as it is with the

TC7106/7107. V_REF- is tied internally to analog

common in the TC7116A/7117A devices.

• True Polarity Indication for Precision Null

Applications

• Convenient 9V Battery Operation:

(TC7116/TC7116A)

• High-Impedance CMOS Differential Inputs: 10¹²Ω

• Low-Power Operation: 10mW

The TC7116A/7117A reduces linearity error to less

than 1 count. Rollover error (the difference in readings

for equal magnitude but opposite polarity input signals)

is below ±1 count. High-impedance differential inputs

offer 1pA leakage current and a 10¹²Ω input imped-

ance. The 15μV_P-Pnoise performance enables a “rock

solid” reading. The auto-zero cycle ensures a zero

display reading with a 0V input.

Applications:

• Thermometry

• Bridge Readouts: Strain Gauges, Load Cells,

Null Detectors

• Digital Meters: Voltage/Current/Ohms/Power, pH

• Digital Scales, Process Monitors

• Portable Instrumentation

The TC7116A and TC7117A feature a precision, low

drift internal reference, and are functionally identical to

the TC7116/TC7117. A low drift external reference is

not normally required with the TC7116A/TC7117A.

Device Selection Table

Package Code

Package

Temperature Range

CPL

IJL

40-Pin PDIP

40-Pin CERDIP

44-Pin PQFP

44-Pin PLCC

0°C to +70°C

-25°C to +85°C

0°C to +70°C

CKW

CLW

DS21457C-page 1

TC7116/A/TC7117/A

Package Type

40-Pin PDIP

40-Pin CERDIP

40

39

38

37

36

35

34

33

32

31

30

HLDR

OSC1

OSC2

OSC3

TEST

1

2

40

39

38

37

36

35

34

33

32

31

30

HLDR

OSC1

OSC2

OSC3

TEST

1

2

D

1

D

1

C

1

3

C

1

3

B

1

4

B

1

4

A

1

5

1's

V

+

A

1

5

1's

V

+

REF

F

1

6

V+

C

F

1

6

V+

C

1

G

1

+

-

7

G

+

-

7

REF

E

1

C

8

E

1

C

8

REF

TC7116CPL

TC7116ACPL

TC7117CPL

TC7117ACPL

TC7116IJL

TC7116AIJL

TC7117IJL

TC7117AIJL

9

D

2

COMMON

9

D

2

COMMON

10

11

12

13

14

15

16

17

18

19

20

C

2

V

+

-

10

11

12

13

14

15

16

17

18

19

20

C

2

V

+

-

IN

B

2

B

2

IN

10's

A

2

29 C

AZ

A

2

29 C

AZ

F

2

28

27

26

25

24

23

22

21

V

F

2

28

V

BUFF

E

2

E

2

27

V

INT

D

3

V-

G

26

D

3

V-

B

3

B

3

25

24

23

22

21

G

2

100's

F

C

F

3

C

A

3

100's

A

E

3

AB

G

1000's

AB

G

1000's

4

3

4

3

POL

(Minus Sign)

BP/GND

(TC7116/7117)

POL

(Minus Sign)

BP/GND

(TC7116/7117)

(TC7116A/TC7117A)

44-Pin PLCC

44-Pin PQFP

6

5

4

3

2

1

44 43 42 41 40

44 43 42 41 40 39 38 37 36 35 34

33

1

2

3

4

5

6

7

NC

F

G

E

7

39

38

37

36

35

34

33

32

31

30

29

V+

C

1

32 G

3

+

-

8

REF

1

C

31

30 A

TEST

OSC3

NC

C

9

REF

1

D

10

11

12

13

14

15

16

17

COMMON

2

29

28

27

26

25

24

23

G

3

C

V

+

TC7116CKW

TC7116ACKW

TC7117CKW

TC7117ACKW

IN

TC7116CLW

TC7116ACLW

TC7117CLW

TC7117ACLW

BP/

GND

OSC2

OSC1

NC

B2

POL

V

-

IN

AB

4

HLDR 8

D

A

2

C

AZ

E

3

9

1

F

2

V

BUFF

INT

F

3

10

11

C

B

E

2

B

3

D

3

1

V-

25 26 27 28

19 20 21 22

12 13 14 15 16 17 18

18 19 20 21 22 23 24

Note 1: NC = No internal connection.

2: Pins 9, 25, 40 and 56 are connected to the die substrate. The potential at these pins is approximately V+. No

external connections should be made.

DS21457C-page 2

TC7116/A/TC7117/A

Typical Application

TC7116/A

TC7117/A

Display

Hold

0.1μF

LCD Display (TC7116/7116A)

or Common Anode LED Display

(TC7117/7117A)

33

1

34

C

HLDR

-

+ C

REF

1MΩ

31

Segment

Drive

2–19

22–25

+

V

+

IN

Analog

Input

–

0.01μF

20

POL

30

32

V

-

Backplane Drive

Minus Sign

21

35

BP/GND

V+

ANALOG

COMMON

24kΩ

28

V

BUFF

+

47kΩ

V

9V

36

26

REF

0.47μF

29

V

+

REF

1kΩ

C

AZ

100mV

0.22μF

27

V

INT

V-

OSC2 OSC3 OSC1

39 38

To Analog

Common (Pin 32)

C

40

OSC

R

OSC

100pF

3 Conversions Per Second

100kΩ

DS21457C-page 3

TC7116/A/TC7117/A

*Stresses above those listed under “Absolute

Maximum Ratings” may cause permanent damage to

the device. These are stress ratings only and functional

operation of the device at these or any other conditions

above those indicated in the operation sections of the

specifications is not implied. Exposure to Absolute

Maximum Rating conditions for extended periods may

affect device reliability.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage:

TC7116/TC7116A (V+ to V-) ...........................15V

TC7117/TC7117A (V+ to GND).......................+6V

V- to GND.........................................................-9V

Analog Input Voltage (Either Input) (Note 1)... V+ to V-

Reference Input Voltage (Either Input)............ V+ to V-

Clock Input:

TC7116/TC7116A............................... TEST to V+

TC7117/TC7117A.................................GND to V+

Package Power Dissipation; T_A≤ 70°C (Note 2)

40-Pin CDIP................................................2.29W

40-Pin PDIP ................................................1.23W

44-Pin PLCC...............................................1.23W

44-Pin PQFP...............................................1.00W

Operating Temperature:

C (Commercial) Device................... 0°C to +70°C

I (Commercial) Device.................... 0°C to +70°C

Storage Temperature..........................-65°C to +150°C

TABLE 1-1:

TC7116/A AND TC7117/A ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7116/A and TC7117/A at T = 25°C,

A

f

= 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.

CLOCK

Symbol

Parameter

Zero Input Reading

Min

Typ

Max

Unit

Test Conditions

= 0V

Z

—

±0

—

Digital

V

IN

IR

Reading Full Scale = 200mV

Ratiometric Reading

999

-1

999/1000

±0.2

1000

+1

Digital

Reading

V

= V

REF

IN

= 100mV

REF

R/O

Rollover Error (Difference in Reading

for Equal Positive and Negative

Readings Near Full Scale)

Counts

V

- = + V + ≅ 200mV

IN IN

or ≈ 2V

Linearity (Maximum Deviation from

Best Straight Line Fit)

-1

—

±0.2

50

+1

—

Counts Full Scale = 200mV or 2V

CMRR

Common Mode Rejection Ratio

(Note 3)

μV/V

μV

V

= ±1V, V = 0V

CM IN

Full Scale = 200mV

V = 0V

IN

e

Noise (Peak to Peak 95% of Time)

15

N

Full Scale = 200mV

I

Leakage Current at Input

Zero Reading Drift

—

1

10

1

pA

V

= 0V

L

IN

0.2

μV/°C

IN

“C” Device = 0°C to +70°C

—

1.0

2

μV/°C “I” Device = -25°C to +85°C

Note 1: Input voltages may exceed the supply voltages provided the input current is limited to ±100μA.

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

3: Refer to “Differential Input” discussion.

4: Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is

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

5: The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to TEST, Pin 37. The

TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to GND, Pin 21.

DS21457C-page 4

TC7116/A/TC7117/A

TABLE 1-1:

TC7116/A AND TC7117/A ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7116/A and TC7117/A at T = 25°C,

A

f

= 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.

CLOCK

Symbol

TC

Parameter

Min

Typ

Max

Unit

Test Conditions

Scale Factor Temperature Coefficient

—

1

5

ppm/°C

V

= 199mV,

IN

SF

“C” Device = 0°C to +70°C

(Ext. Ref = 0ppm°C)

—

30

—

70

—

20

—

ppm/°C “I” Device = -25°C to +85°C

Input Resistance, Pin 1

kΩ

V

(Note 5)

V

Pin 1

Test + 1.5

GND + 1.5

—

TC7116/A Only

TC7117/A Only

Both

IL,

IH,

—

V

+

V - 1.5

—

V

I

Supply Current (Does not Include LED

Current for TC7117/A)

0.8

1.8

mA

V

= 0V

IN

DD

V

Analog Common Voltage

(with Respect to Positive Supply)

2.4

—

3.05

3.35

V

25kΩ Between Common

and Positive Supply

C

V

Temperature Coefficient of Analog

Common (with Respect to Positive

Supply)

—

20

80

—

50

—

“C” Device: 0°C to +70°C

CTC

ppm/°C TC7116A/TC7117A

ppm/°C TC7116/TC7117

V

TC7116/TC7117A ONLY Peak to Peak

Segment Drive Voltage

4

5

6

V

V+ to V- = 9V

(Note 4)

SD

TC7116A/TC7116A ONLY Peak to

Peak

5

6

V

V+ to V- = 9V

(Note 4)

BD

Backplane Drive Voltage

TC7117/TC7117A ONLY

Segment Sinking Current

(Except Pin 19)

5

8

—

mA

V+ = 5.0V

Segment Voltage = 3V

TC7117/TC7117A ONLY

10

16

V+ = 5.0V

Segment Sinking Current (Pin 19 Only)

Segment Voltage = 3V

Note 1: Input voltages may exceed the supply voltages provided the input current is limited to ±100μA.

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

3: Refer to “Differential Input” discussion.

4: Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is

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

5: The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to TEST, Pin 37. The

TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to GND, Pin 21.

DS21457C-page 5

TC7116/A/TC7117/A

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin Number

(40-Pin PDIP)

(40-Pin CERDIP)

Pin Number

Symbol

Description

(44-Pin PQFP)

1

2

8

HLDR

Hold pin, Logic 1 holds present display reading.

Activates the D section of the units display.

Activates the C section of the units display.

Activates the B section of the units display.

Activates the A section of the units display.

Activates the F section of the units display.

Activates the G section of the units display.

Activates the E section of the units display.

Activates the D section of the tens display.

Activates the C section of the tens display.

Activates the B section of the tens display.

Activates the A section of the tens display.

Activates the F section of the tens display.

Activates the E section of the tens display.

Activates the D section of the hundreds display.

Activates the B section of the hundreds display.

Activates the F section of the hundreds display.

Activates the E section of the hundreds display.

Activates both halves of the 1 in the thousands display.

Activates the negative polarity display.

9

D

C

1

3

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

4

B

A

F

5

6

7

G

1

8

E

1

9

D

C

2

10

11

12

13

14

15

16

17

18

19

20

21

B

A

F

E

D

3

B

F

E

AB

4

POL

BP/

GND

LCD backplane drive output (TC7116/TC7116A). Digital ground

(TC7117/TC7117A).

22

23

24

25

26

27

29

30

31

32

34

35

G

Activates the G section of the hundreds display.

Activates the A section of the hundreds display.

Activates the C section of the hundreds display.

Activates the G section of the tens display.

Negative power supply voltage.

3

A

C

G

2

V-

V

Integrator output. Connection point for integration capacitor.

See Section 4.3 “Integrating Capacitor”, Integrating Capacitor for more

details.

INT

28

29

36

37

V

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

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

BUFF

C

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 Section 4.1 “Auto-Zero Capacitor”, Auto-Zero Capacitor for more details.

AZ

30

31

32

38

39

40

V

-

The analog LOW input is connected to this pin.

IN

V

+

The analog HIGH input signal is connected to this pin.

IN

COMMON This pin is primarily used to set the Analog Common mode voltage for battery

operation, or in systems where the input signal is referenced to the power sup-

ply. It also acts as a reference voltage source. See Section 3.1.6 “Analog Com-

mon”, Analog Common for more details.

33

41

C

-

See Pin 34.

REF

DS21457C-page 6

TC7116/A/TC7117/A

TABLE 2-1:

PIN FUNCTION TABLE (CONTINUED)

Pin Number

(40-Pin PDIP)

(40-Pin CERDIP)

Pin Number

Symbol

Description

(44-Pin PQFP)

34

42

C

+

A 0.1μF capacitor is used in most applications. If a large Common mode voltage

REF

exists (for example, the V - pin is not at analog common), and a 200mV scale is

IN

used, a 1μF capacitor is recommended and will hold the rollover error to

0.5 count.

35

36

43

44

V+

Positive Power Supply Voltage.

V

+

The analog input required to generate a full scale output (1999 counts). Place

100mV between Pins 32 and 36 for 199.9mV full scale. Place 1V between

Pins 35 and 36 for 2V full scale. See Section 4.6 “Reference Voltage”, Refer-

ence Voltage.

REF

37

3

TEST

Lamp test. When pulled HIGH (to V+), all segments will be turned on and the dis-

play should read -1888. It may also be used as a negative supply for externally

generated decimal points. See Section 3.1.7 “Test”, TEST for additional infor-

mation.

38

39

40

4

6

7

OSC3

OSC2

OSC1

See Pin 40.

Pins 40, 39, 38 make up the oscillator section. For a 48kHz clock (3 readings per

section), connect Pin 40 to the junction of a 100kΩ resistor and a 100pF capaci-

tor. The 100kΩ resistor is tied to Pin 39 and the 100pF capacitor is tied to Pin 38.

DS21457C-page 7

TC7116/A/TC7117/A

Since the comparator is included in the loop, AZ

accuracy is limited only by system noise. The offset

referred to the input is less than 10μV.

3.0

DETAILED DESCRIPTION

(All Pin Designations Refer to 40-Pin PDIP.)

3.1.2

SIGNAL INTEGRATE PHASE

3.1

Analog Section

The auto-zero loop is opened, the internal short is

removed, and the internal high and low inputs are

connected to the external pins. The converter then inte-

grates the differential voltages between V_IN+ and V_IN-

for a fixed time. This differential voltage can be within a

wide Common mode range: 1V of either supply. How-

ever, if the input signal has no return with respect to the

converter power supply, V_IN- can be tied to analog

common to establish the correct Common mode

voltage. At the end of this phase, the polarity of the

integrated signal is determined.

Figure 3-1 shows the block diagram of the analog sec-

tion for the TC7116/TC7116A and TC7117/TC7117A.

Each measurement cycle is divided into three phases:

(1) Auto-Zero (AZ), (2) Signal Integrate (INT), and

(3) Reference Integrate (REF), or De-integrate (DE).

3.1.1

AUTO-ZERO PHASE

High and low inputs are disconnected from the pins and

internally shorted to analog common. The reference

capacitor is charged to the reference voltage. A feed-

back loop is closed around the system to charge the

auto-zero capacitor (C_AZ) to compensate for offset volt-

ages in the buffer amplifier, integrator, and comparator.

C

V

AZ

INT

R

C

INT

V+

35

REF

C

+

V

+

C

-

V

BUFF

REF

INT

REF

Auto-Zero

29

34

36

33

28

27

V+

–

+

Integrator

AZ

10μA

Low

Temp.

Drift

–

+

To

Digital

Section

31

V

IN

+

DE

(–)

DE

(+)

INT

AZ

Zener

V

AZ

–

+

REF

Comparator

DE (+)

32

30

DE (–)

TC7116

TC7116A

TC7117

Analog

Common

V+ -3V

AZ & DE ( )

V

IN

-

TC7117A

26

INT

V-

FIGURE 3-1:

Analog Section of TC7116/TC7116A and TC7117/TC7117A

3.1.3

REFERENCE INTEGRATE PHASE

3.1.4

REFERENCE

The final phase is reference integrate, or de-integrate.

Input low is internally connected to analog common

and input high is connected across the previously

charged reference capacitor. Circuitry within the chip

ensures that the capacitor will be connected with the

correct polarity to cause the integrator output to return

to zero. The time required for the output to return to

zero is proportional to the input signal. The digital

reading displayed is:

The positive reference voltage (V_REF+) is referred to

analog common.

EQUATION 3-1:

V_IN

1000 =

V_REF

DS21457C-page 8

TC7116/A/TC7117/A

Analog common is also used as V_IN- return during

auto-zero and de-integrate. If V_IN- is different from ana-

log common, a Common mode voltage exists in the

system and is taken care of by the excellent CMRR of

the converter. However, in some applications, V_IN- will

be set at a fixed, known voltage (power supply common

for instance). In this application, analog common

should be tied to the same point, thus removing the

Common mode voltage from the converter. The same

holds true for the reference voltage; if it can be conve-

niently referenced to analog common, it should be. This

removes the Common mode voltage from the

reference system.

3.1.5

DIFFERENTIAL INPUT

This input can accept differential voltages anywhere

within the Common mode range of the input amplifier

or, specifically, from 1V below the positive supply to 1V

above the negative supply. In this range, the system

has a CMRR of 86dB, typical. However, since the inte-

grator also swings with the Common mode voltage,

care must be exercised to ensure that the integrator

output does not saturate. A worst-case condition would

be a large, positive Common mode voltage with a near

full scale negative differential input voltage. The nega-

tive input signal drives the integrator positive, when

most of its swing has been used up by the positive

Common mode voltage. For these critical applications,

the integrator swing can be reduced to less than the

recommended 2V full scale swing with little loss of

accuracy. The integrator output can swing within 0.3V

of either supply without loss of linearity.

Within the IC, analog common is tied to an N-channel

FET, that can sink 30mA or more of current to hold the

voltage 3V below the positive supply (when a load is

trying to pull the analog common line positive). How-

ever, there is only 10μA of source current, so analog

common may easily be tied to a more negative voltage,

thus overriding the internal reference.

3.1.6

ANALOG COMMON

This pin is included primarily to set the Common mode

voltage for battery operation (TC7116/TC7116A), or for

any system where the input signals are floating, with

respect to the power supply. The analog common pin

sets a voltage approximately 2.8V more negative than

the positive supply. This is selected to give a minimum

end of life battery voltage of about 6V. However, analog

common has some attributes of a reference voltage.

When the total supply voltage is large enough to cause

the Zener to regulate (>7V), the analog common volt-

age will have a low voltage coefficient (0.001%), low

output impedance (≅15Ω), and a temperature coeffi-

cient of less than 20ppm/°C, typically, and 50 ppm max-

imum. The TC7116/TC7117 temperature coefficients

are typically 80ppm/°C.

3.1.7

TEST

The TEST pin serves two functions. On the TC7117/

TC7117A, it is coupled to the internally generated digi-

tal supply through a 500Ω resistor. Thus, it can be used

as a negative supply for externally generated segment

drivers, such as decimal points, or any other presenta-

tion the user may want to include on the LCD.

(Figure 3-3 and Figure 3-4 show such an application.)

No more than a 1mA load should be applied.

The second function is a “lamp test.” When TEST is

pulled HIGH (to V+), all segments will be turned ON

and the display should read -1888. The TEST pin will

sink about 10mA under these conditions.

An external reference may be used, if necessary, as

shown in Figure 3-2.

V+

TC7116

TC7116A

4049

V+

BP

To LCD

Decimal

Point

V+

21

37

6.8kΩ

TC7116

TC7116A

TC7117

GND

TEST

To LCD

Backplane

TC7117A

20kΩ

FIGURE 3-3:

Simple Inverter for Fixed

V

+

REF

Decimal Point

1.2V REF

COMMON

FIGURE 3-2:

Reference

Using an External

DS21457C-page 9

TC7116/A/TC7117/A

large P-channel source follower. This supply is made

stiff to absorb the relative large capacitive currents

when the backplane (BP) voltage is switched. The BP

frequency is the clock frequency 4800. For 3 readings

per second, this is a 60Hz square wave with a nominal

amplitude of 5V. The segments are driven at the same

frequency and amplitude, and are in phase with BP

when OFF, but out of phase when ON. In all cases,

negligible DC voltage exists across the segments.

V+

BP

TC7116

TC7116A

To LCD

Decimal

Point

Decimal

Point

Select

Figure is the digital section of the TC7117/TC7117A. It

is identical to the TC7116/TC7116A, except that the

regulated supply and BP drive have been eliminated,

and the segment drive is typically 8mA. The 1000’s out-

put (Pin 19) sinks current from two LED segments, and

has a 16mA drive capability. The TC7117/TC7117A are

designed to drive common anode LED displays.

4030

GND

TEST

FIGURE 3-4:

Decimal Point Drive

Exclusive “OR” Gate for

In both devices, the polarity indication is ON for analog

inputs. If V_IN- and V_IN+ are reversed, this indication can

be reversed also, if desired.

3.2

Digital Section

Figure 3-5 and Figure show the digital section for

TC7116/TC7116A and TC7117/TC7117A, respectively.

For the TC7116/TC7116A (Figure 3-5), an internal dig-

ital ground is generated from a 6V Zener diode and a

TC7116

TC7116A

Backplane

21

LCD Phase Driver

Typical Segment Output

V+

7-Segment

Decode

7-Segment

Decode

7-Segment

Decode

÷

200

0.5mA

Segment

Output

Latch

Tens

2mA

Internal Digital Ground

Thousands

Units

Hundreds

To Switch Drivers

From Comparator Output

35

37

V+

~70kΩ

= 1V

Clock

6.2V

÷

4

Logic Control

TEST

V-

V

500Ω

TH

26

Internal Digital Ground

40

39

38

1

OSC1

OSC2

OSC3

HLDR

FIGURE 3-5:

TC7116/TC7116A Digital Section

DS21457C-page 10

TC7116/A/TC7117/A

To achieve maximum rejection of 60Hz pickup, the sig-

nal integrate cycle should be a multiple of 60Hz. Oscil-

lator frequencies of 240kHz, 120kHz, 80kHz, 60kHz,

48kHz, 40kHz, etc. should be selected. For 50Hz rejec-

tion, oscillator frequencies of 200kHz, 100kHz,

66-2/3kHz, 50kHz, 40kHz, etc. would be suitable. Note

that 40kHz (2.5 readings per second) will reject both

50Hz and 60Hz.

3.2.1

SYSTEM TIMING

The clocking method used for the TC7116/TC7116A

and TC7117/TC7117A is shown in Figure . Three

clocking methods may be used:

1. An external oscillator connected to Pin 40.

2. A crystal between Pins 39 and 40.

3. An RC network using all three pins.

The oscillator frequency is ÷4 before it clocks the

decade counters. It is then further divided to form the

three convert cycle phases: Signal Integrate (1000

counts), Reference De-integrate (0 to 2000 counts),

and Auto-Zero (1000 to 3000 counts). For signals less

than full scale, auto-zero gets the unused portion of ref-

erence de-integrate. This makes a complete measure

cycle of 4000 (16,000 clock pulses), independent of

input voltage. For 3 readings per second, an oscillator

frequency of 48kHz would be used.

3.2.2

HOLD READING INPUT

When HLDR is at a logic HIGH, the latch will not be

updated. Analog-to-Digital conversions will continue,

but will not be updated until HLDR is returned to LOW.

To continuously update the display, connect to TEST

(TC7116/TC7116A) or GROUND (TC7117/TC7117A),

or disconnect. This input is CMOS compatible with

70kΩ typical resistance to TEST (TC7116/TC7116A) or

GROUND (TC7117/TC7117A).

TC7117

TC7117A

Typical Segment Output

V+

7-Segment 7-Segment

Decode

7-Segment

Decode

0.5mA

Decode

To

Segment

8mA

Latch

Digital Ground

Internal Digital Ground

Thousands

Units

Hundreds

Tens

To Switch Drivers

From Comparator Output

V+

35

37

V+

TEST

Clock

÷

4

Control Logic

500Ω

21

Digital

GND

40

39

OSC2

38

1

~70kΩ

OSC1

OSC3

HLDR

FIGURE 3-6:

TC7117/TC7117A Digital Section

DS21457C-page 11

TC7116/A/TC7117/A

4.5

Oscillator Components

4.0

COMPONENT VALUE

SELECTION

For all frequency ranges, a 100kΩ resistor is recom-

mended; the capacitor is selected from the equation:

4.1

Auto-Zero Capacitor

EQUATION 4-1:

The size of the auto-zero capacitor has some influence

on system noise. For 200mV full scale, where noise is

very important, a 0.47μF capacitor is recommended.

On the 2V scale, a 0.047μF capacitor increases the

speed of recovery from overload and is adequate for

noise on this scale.

0.45

RC

f = -------

For a 48kHz clock (3 readings per second), C = 100pF.

4.6

Reference Voltage

4.2

Reference Capacitor

To generate full scale output (2000 counts), the analog

input requirement is V_IN= 2V_REF. Thus, for the 200mV

and 2V scale, V_REFshould equal 100mV and 1V,

respectively. In many applications, where the ADC is

connected to a transducer, a scale factor exists

between the input voltage and the digital reading. For

instance, in a measuring system, the designer might like

to have a full scale reading when the voltage from the

transducer is 700mV. Instead of dividing the input down

to 200mV, the designer should use the input voltage

directly and select V_REF= 350mV. Suitable values for

integrating resistor and capacitor would be 120kW and

0.22μF. This makes the system slightly quieter and also

avoids a divider network on the input. The TC7117/

TC7117A, with ±5V supplies, can accept input signals

up to ±4V. Another advantage of this system is when a

digital reading of zero is desired for V_IN≠ 0. Tempera-

ture and weighing systems with a variable tare are

examples. This offset reading can be conveniently gen-

erated by connecting the voltage transducer between

V_IN+ and analog common, and the variable (or fixed)

offset voltage between analog common and V_IN-.

A 0.1μF capacitor is acceptable in most applications.

However, where a large Common mode voltage exists

(i.e., the V_IN- pin is not at analog common), and a

200mV scale is used, a larger value is required to pre-

vent rollover error. Generally, 1μF will hold the rollover

error to 0.5 count in this instance.

4.3

Integrating Capacitor

The integrating capacitor should be selected to give the

maximum voltage swing that ensures tolerance buildup

will not saturate the integrator swing (approximately

0.3V from either supply). In the TC7116/TC7116A or

the TC7117/TC7117A, when the analog common is

used as a reference, a nominal ±2V full scale integrator

swing is acceptable. For the TC7117/TC7117A, with

±5V supplies and analog common tied to supply

ground, a ±3.5V to ±4V swing is nominal. For 3 read-

ings per second (48kHz clock), nominal values for C_INT

are 0.22μ1F and 0.10μF, respectively. If different oscil-

lator frequencies are used, these values should be

changed in inverse proportion to maintain the output

swing. The integrating capacitor must have low dielec-

tric absorption to prevent rollover errors. Polypropylene

capacitors are recommended for this application.

4.4

Integrating Resistor

Both the buffer amplifier and the integrator have a class

A output stage with 100μA of quiescent current. They

can supply 20μA of drive current with negligible non-

linearity. The integrating resistor should be large

enough to remain in this very linear region over the

input voltage range, but small enough that undue leak-

age requirements are not placed on the PC board. For

2V full scale, 470kΩ is near optimum and, similarly,

47kΩ for 200mV full scale.

DS21457C-page 12

TC7116/A/TC7117/A

5.0

TC7117/TC7117A POWER

SUPPLIES

The TC7117/TC7117A are designed to operate from

±5V supplies. However, if a negative supply is not avail-

able, it can be generated with a TC7660 DC-to-DC con-

verter and two capacitors. Figure 5-1 shows this

application.

In selected applications, a negative supply is not

required. The conditions for using a single +5V supply

are:

1. The input signal can be referenced to the center

of the Common mode range of the converter.

2. The signal is less than ±1.5V.

3. An external reference is used.

+5V

35

V+

36

V

+

REF

LED

Drive

32

31

COM

TC7117

TC7117A

+

V

+

-

IN

V

IN

30

21

V

IN

8

–

2

4

GND

+

V-

TC7660

10μF

26

5

(-5V)

3

+

10μF

FIGURE 5-1:

Negative Power Supply

Generation with TC7660

DS21457C-page 13

TC7116/A/TC7117/A

Reduced power dissipation is very easy to obtain.

Figure 6-2 shows two ways: either a 5.1Ω, 1/4W resis-

tor, or a 1A diode placed in series with the display (but

not in series with the TC7117/TC7117A). The resistor

reduces the TC7117/TC7117A’s output voltage (when

all 24 segments are ON) to Point C of Figure 6-1. When

segments turn off, the output voltage will increase. The

diode, however, will result in a relatively steady output

voltage, around Point B.

6.0

TYPICAL APPLICATIONS

The TC7117/TC7117A sink the LED display current,

causing heat to build up in the IC package. If the inter-

nal voltage reference is used, the changing chip tem-

perature can cause the display to change reading. By

reducing the LED common anode voltage, the TC7117/

TC7117A package power dissipation is reduced.

Figure 6-1 is a curve tracer display showing the rela-

tionship between output current and output voltage for

typical TC7117CPL/TC7117ACPL devices. Since a

typical LED has 1.8V across it at 8mA and its common

anode is connected to +5V, the TC7117/TC7117A out-

put is at 3.2V (Point A, Figure 6-1). Maximum power

dissipation is 8.1mA x 3.2V x 24 segments = 622mW.

In addition to limiting maximum power dissipation, the

resistor reduces change in power dissipation as the

display changes. The effect is caused by the fact that,

as fewer segments are ON, each ON output drops

more voltage and current. For the best-case of six

segments (a “111” display) to worst-case (a “1888”

display), the resistor circuit will change about 230mW,

while a circuit without the resistor will change about

470mW. Therefore, the resistor will reduce the effect of

display dissipation on reference voltage drift by about

50%.

However, notice that once the TC7117/TC7117A’s out-

put voltage is above 2V, the LED current is essentially

constant as output voltage increases. Reducing the

output voltage by 0.7V (Point B Figure 6-1) results in

7.7mA of LED current, only a 5% reduction. Maximum

power dissipation is now only 7.7mA x 2.5V x 24 =

462mW, a reduction of 26%. An output voltage reduc-

tion of 1V (Point C) reduces LED current by 10%

(7.3mA), but power dissipation by 38% (7.3mA x 2.2V

x 24 = 385mW).

The change in LED brightness caused by the resistor is

almost unnoticeable as more segments turn off. If

display brightness remaining steady is very important

to the designer, a diode may be used instead of the

resistor.

In

-5V

+5V

+

–

10.000

1MΩ

TP3

24kΩ

1kΩ

150kΩ

9.000

A

B

0.47

μF

8.000

C

0.22

μF

100

pF

0.01

μF

TP5

7.000

TP2

TP1

0.1

μF

Display

100

kΩ

47

kΩ

6.000

2.00

2.50

3.00

3.50

4.00

40

1

35

30

TP

4

21

TC7117

TC7117A

Output Vo ltage (V)

10

20

Display

FIGURE 6-1:

vs. Output Voltage

TC7117/TC7117A Output

1.5W, 1/4Ω

1N4001

FIGURE 6-2:

Diode or Resistor Limits

Package Power Dissipation

DS21457C-page 14

TC7116/A/TC7117/A

Set V

REF

= 100mV

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

100pF

22kΩ

1MΩ

0.1pF

1kΩ

+

In

–

0.01μF

TC7116

TC7116A

+

–

0.47μF

47kΩ

9V

0.22μF

To Display

To Backplane

FIGURE 6-3:

TC7116/TC7117A Using the Internal Reference (200 mV Full Scale, 3 Readings Per

Second – RPS)

Set V

REF

= 100mV

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

100pF

22kΩ

1MΩ

+5V

1kΩ

0.1pF

+

–

In

0.01μF

TC7117

TC7117A

0.47μF

47kΩ

0.22μF

-5V

To Display

FIGURE 6-4:

TC7117/TC7117A Internal Reference (200 mV Full Scale, 3 RPS, V_IN- Tied to GND for

Single Ended Inputs

DS21457C-page 15

TC7116/A/TC7117/A

V+

40

35

To Logic V

CC

To Logic

GND

TC7116

TC7116A

26

V-

O/R

U/R

20

21

CD4023

or 74C10

CD4077 O/R = Over Range

U/R = Under Range

FIGURE 6-5:

Circuit for Developing Under Range and Over Range Signals From TC7116/TC7117A

Outputs

40

100kΩ

Set V

REF

= 100mV

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100pF

10kΩ

V+

1kΩ

0.1pF

+

–

1.2V

In

0.01μF

47kΩ

1MΩ

TC7117

TC7117A

0.47μF

0.22μF

To Display

FIGURE 6-6:

TC7117/TC7117A With A 1.2 External Bandgap Reference (V_IN- Tied to Common)

DS21457C-page 16

TC7116/A/TC7117/A

Set V

= 1V

REF

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

100pF

24kΩ

1MΩ

V+

0.1μF

25kΩ

+

TC7116

TC7116A

TC7117

In

0.01μF

470kΩ

0.047μF

–

TC7117A

0.22μF

V-

To Display

FIGURE 6-7:

Recommended Component Values for 2V Full Scale (TC7116/TC7116A and TC7117/

TC7117A)

40

100kΩ

Set V

REF

= 100mV

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100pF

10kΩ

V+

1kΩ

0.1pF

+

–

1.2V

In

0.01μF

47kΩ

1MΩ

TC7117

TC7117A

0.47μF

0.22μF

To Display

FIGURE 6-8:

TC7117/TC7117A Operated From Single +5V Supply (An External Reference Must be

Used in This Application)

DS21457C-page 17

TC7116/A/TC7117/A

7.0

7.1

PACKAGING INFORMATION

Package Marking Information

Package marking data not available at this time.

7.2

Taping Form

Component Taping Orientation for 44-Pin PLCC Devices

User Direction of Feed

Pin 1

W

P

Standard Reel Component Orientation

for 713 Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

44-Pin PLCC

32 mm

24 mm

500

13 in

Note: Drawing does not represent total number of pins.

Component Taping Orientation for 44-Pin PQFP Devices

User Direction of Feed

Pin 1

W

P

Standard Reel Component Orientation

for 713 Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

44-Pin PQFP

24 mm

16 mm

500

13 in

Note: Drawing does not represent total number of pins.

DS21457C-page 18

TC7116/A/TC7117/A

7.3

Package Dimensions

40-Pin PDIP (Wide)

Pin 1

.555 (14.10)

.530 (13.46)

2.065 (52.45)

2.027 (51.49)

.610 (15.49)

.590 (14.99)

.200 (5.08)

.140 (3.56)

.040 (1.02)

.020 (0.51)

.015 (0.38)

.008 (0.20)

.150 (3.81)

.115 (2.92)

3° Min.

.700 (17.78)

.610 (15.50)

.110 (2.79)

.090 (2.29)

.070 (1.78)

.045 (1.14)

.022 (0.56)

.015 (0.38)

Dimensions: inches (mm)

40-Pin CERDIP (Wide)

Pin 1

.540 (13.72)

.510 (12.95)

.098 (2.49) Max.

.030 (0.76) Min.

2.070 (52.58)

2.030 (51.56)

.620 (15.75)

.590 (15.00)

.060 (1.52)

.020 (0.51)

.210 (5.33)

.170 (4.32)

.015 (0.38)

.008 (0.20)

3° Min.

.150 (3.81)

Min.

.200 (5.08)

.125 (3.18)

.700 (17.78)

.620 (15.75)

.020 (0.51)

.016 (0.41)

.110 (2.79)

.090 (2.29)

.065 (1.65)

.045 (1.14)

Dimensions: inches (mm)

DS21457C-page 19

TC7116/A/TC7117/A

7.3

Package Dimensions (Continued)

W

P

Standard Reel Component Orientation

for 713 Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

44-Pin PLCC

32 mm

24 mm

500

13 in

Note: Drawing does not represent total number of pins.

Dimensions: inches (mm)

44-Pin PQFP

7° Max.

.009 (0.23)

.005 (0.13)

Pin 1

.041 (1.03)

.026 (0.65)

.018 (0.45)

.012 (0.30)

.398 (10.10)

.390 (9.90)

.557 (14.15)

.537 (13.65)

.031 (0.80) Typ.

.010 (0.25) Typ.

.398 (10.10)

.390 (9.90)

.083 (2.10)

.075 (1.90)

.557 (14.15)

.537 (13.65)

.096 (2.45) Max.

Dimensions: inches (mm)

DS21457C-page 20

TC7116/A/TC7117/A

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART CODE

6 = LCD

7 = LED

TC711X X X XXX

}

A or blank*

R (reversed pins) or blank (CPL pkg only)

* "A" parts have an improved reference TC

Package Code (see Device Selection Table)

DS21457C-page 21

TC7116/A/TC7117/A

NOTES:

DS21457C-page 22

Note the following details of the code protection feature on Microchip devices:

•

Microchip products meet the specification contained in their particular Microchip Data Sheet.

•

Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

•

There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

•

Microchip is willing to work with the customer who is concerned about the integrity of their code.

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

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OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

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conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,

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PRO MATE, PowerSmart, rfPIC, and SmartShunt are

registered trademarks of Microchip Technology Incorporated

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Company are registered trademarks of Microchip Technology

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Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi,

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EEPROMs, microperipherals, nonvolatile memory and analog

products. In addition, Microchip’s quality system for the design and

manufacture of development systems is ISO 9001:2000 certified.

DS21457C-page 23

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Fax: 852-2401-3431

Korea - Gumi

Tel: 82-54-473-4301

Fax: 82-54-473-4302

Boston

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Malaysia - Penang

Tel: 60-4-646-8870

Fax: 60-4-646-5086

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Detroit

China - Shenzhen

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Xian

Tel: 86-29-8833-7250

Fax: 86-29-8833-7256

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

San Jose

Mountain View, CA

Tel: 650-215-1444

Fax: 650-961-0286

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

02/16/06

DS21457C-page 24


型号：	TC7116ARCPL
厂家：	MICROCHIP
描述：	1-CH 13-BIT DUAL-SLOPE ADC, PDIP40, PLASTIC, DIP-40 转换器
文件：	总24页 (文件大小：410K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TC7116ARCPL [MICROCHIP]

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