TelCom Semiconductor Inc TC7116CPL, TC7116ARIJL, TC7116ARCPL, TC7116ARCKW, TC7116ARCLW Datasheet

3-203

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

3-1/2 DIGIT ANALOG-T O-DIGITAL CONVERTERS WITH HOLD

V

REF

+

TC7116/A

9V

V

REF

33

34

24 kΩ

1 kΩ

31

29

36

39 38 40

0.47 µF

0.1 µF

V

–

1

OSC

3

OSC

2

OSC

TO ANALOG
COMMON (PIN 32)

3 CONVERSIONS/SEC

C

OSC

100 kΩ

47 kΩ

0.22 µF

0.01 µF

ANALOG

INPUT

+

–

C

REF

–

C

REF

+

V

IN

+

V

IN

–

ANALOG
COMMON

V

INT

V

BUFF

C

AZ

20
21
35

SEGMENT
DRIVE

2–19

22–25

POL

BP/GND

V

+

MINUS SIGN

BACKPLANE
DRIVE

28

R

OSC

100 pF

LCD DISPLAY (TC7116/7116A)

OR COMMON ANODE LED

DISPLAY (TC7117/7117A)

1 MΩ

27

30

32

HLDR

DISPLAY
HOLD

100 mV

1

26

TC7117/A

+

FEATURES

■ Low Temperature Drift Internal Reference

TC7116/TC7117............................. 80 ppm/°C Typ

TC7116A/TC7117A........................20 ppm/°C Typ

■ Display Hold Function

■ Directly Drives LCD or LED Display

■ Guaranteed Zero Reading With Zero Input

■ Low Noise for Stable

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

■ Auto-Zero Cycle Eliminates Need for Zero

Adjustment Potentiometer

■ True Polarity Indication for Precision Null

Applications

■ Convenient 9V Battery Operation

(TC7116/TC7116A)

■ High Impedance CMOS Differential Inputs.... 1012Ω

■ Low Power Operation.................................... 10 mW

GENERAL DESCRIPTION

The TC7116A/TC7117A are 3-1/2 digit CMOS analog­to-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 backplane driver. The
TC7117A drives common anode light emitting diode (LED)
displays directly with an 8-mA drive current per segment.

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 reference
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.

The TC7116A/7117A reduces linearity error to less
than 1 count. Roll-over error (the difference in readings for
equal magnitude but opposite polarity input signals) is
below ±1 count. High-impedance differential inputs offer 1
pA leakage current and a 1012Ω input impedance. The 15
µV

P-P

noise performance guarantees a “rock solid” reading.
The auto-zero cycle guarantees a zero display reading with
a 0V input.

The TC7116A and TC7117A feature a precision, low­drift internal reference, and are functionally identical to the
TC7116/TC7117. A low-drift external reference is not
normally required with the TC7116A/TC7117A.

AVAILABLE PACKAGES

40-Pin Plastic

DIP

40-Pin CerDIP

44-Pin Plastic Quad Flat

Package Formed Leads

44-Pin Plastic Chip

Carrier PLCC

Package Temperature
Code Package Range

CKW 44-Pin PQFP 0°C to +70°C
CLW 44-Pin PLCC 0°C to +70°C
CPL 40-Pin Plastic DIP 0°C to +70°C
IJL 40-Pin CerDIP – 25°C to +85°C

Figure 1. Typical TC7116/A/7/A Operating Circuit

TC7116

TC7116A

TC7117

TC7117A

TC7116/A/7117/A-7 10/18/96

ORDERING INFORMATION
PART CODE TC711X X X XXX

6 = LCD
7 = LED

A or blank*
R (reversed pins) or blank (CPL pkg. only)

* "A" parts have an improved reference TC
Package Code (see below):

}

3-204

TELCOM SEMICONDUCTOR, INC.

3-1/2 DIGIT ANALOG-TO-DIGITAL

CONVERTERS WITH HOLD

TC7116
TC7116A
TC7117
TC7117A

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, TA ≤ 70°C (Note 2)

CerDIP..............................................................2.29W

Plastic DIP ........................................................1.23W

Plastic Chip Carrier (PLCC)..............................1.23W

Plastic Quad Flat Package (PQFP) ..................1.00W

Operating Temperature

“C” Device..............................................0°C to +70°C

“I” Device ..........................................– 25°C to +85°C

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

Lead Temperature (Soldering, 10 sec) ................. +300°C

*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. 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 operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.

ELECTRICAL CHARACTERISTICS (Note 3)

Parameter Test Conditions Min Typ Max Unit

Zero Input Reading VIN = 0V — ±0 — Digital

Full Scale = 200 mV Reading

Ratiometric Reading VIN = V

REF

999 999/1000 1000 Digital

V

REF

= 100 mV Reading

Roll-Over Error (Difference in –VIN = +VIN ≅ 200 mV or ≈ 2V – 1 ±0.2 +1 Counts
Reading for Equal Positive and
Negative Readings Near Full Scale)

Linearity (Maximum Deviation From Full Scale = 200 mV or 2V – 1 ±0.2 +1 Counts
Best Straight Line Fit)

Common-Mode Rejection Ratio (Note 4) VCM = ±1V, VIN = 0V — 50 — µV/V

Full Scale = 200 mV

Noise (Peak-to-Peak Value Not VIN = 0V — 15 — µV
Exceeded 95% of Time) Full Scale = 200 mV

Leakage Current at Input VIN = 0V — 1 10 pA
Zero Reading Drift V

IN

= 0V
“C” Device: 0°C to +70°C — 0.2 1 µV/°C
“I” Device: –25°C to +85°C—12µv/°C

Scale Factor Temperature Coefficient VIN = 199 mV

“C” Device: 0°C to +70°C — 1 5 ppm/°C
(Ext Ref = 0 ppm/°C)
“I” Device: –25°C to +85°C — — 20 ppm/°C

Input Resistance, Pin 1 Note 6 30 70 — kΩ
VIL, Pin 1 TC7116/A Only — — Test +1.5 V
VIL, Pin 1 TC7117/A Only — — GND +1.5 V
VIH, Pin 1 Both V+ – 1.5 — — V
Supply Current (Does Not Include VIN = 0V — 0.8 1.8 mA

LED Current for 7117/A)
Analog Common Voltage 25 kΩ Between Common 2.4 3.05 3.35 V

(With Respect to Positive Supply) and Positive Supply
Temperature Coefficient of Analog Common "C" Device: 0°C to +70°C

(With Respect to Positive Supply) TC7116A/TC7117A — 20 50 ppm/°C

TC7116/TC7117 — 80 — ppm/°C

3-205

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

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3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD

TC7116

TC7116A

TC7117

TC7117A

ELECTRICAL CHARACTERISTICS (Cont.)

Parameter Test Conditions Min Typ Max Unit

Temperature Coefficient of Analog Common "I" Device: –25°C to +85°C — — 75 ppm/°C
(With Respect to Positive Supply) 25 kΩ Between Common and

Positive Supply (TC7116A/TC7117A)

TC7116/TC7116A ONLY Peak-to-Peak V+ to V– = 9V 4 5 6 V
Segment Drive Voltage (Note 5)

TC7116/TC7116A ONLY Peak-to-Peak V+ to V– = 9V 4 5 6 V
Backplane Drive Voltage (Note 5)

TC7117/TC7117A ONLY Segment V

+

= 5V 5 8 — mA

Sinking Current (Except Pin 19) Segment Voltage = 3V
TC7117/TC7117A ONLY Segment V

+

= 5V 10 16 — mA

Sinking Current (Pin 19 Only) Segment Voltage = 3V

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

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

3. Unless otherwise noted, specifications apply at TA = +25°C, f

CLOCK

= 48 kHz. TC7116/TC7116A and TC7117/TC7117A are tested in the

circuit of Figure 1.

4. Refer to "Differential Input" discussion.

5. 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 50 mV.

6. 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.

3-206

TELCOM SEMICONDUCTOR, INC.

TC7116
TC7116A
TC7117
TC7117A

BP/

GND

33

34

35

36

37

38

39

13

10

9

8

7

COMMON

V

+

18 19 20 21 23 24

3

AB

4

POL

NC

IN HI
NC
IN LO

B

6543 1442

A

OSC

22

43

OSC42OSC41TEST40REF HI

25 26 27 28

F

E

G

A

C

G

3214

A/Z

2

3115

BUFF

2

3016

INT

E

2917

D

NC

11
12

NC

C

D

3

2

F

A

2

2

2

B

3

3

3

3

3

2

TC7116CLW

TC7116ACLW

TC7117CLW

TC7117ACLW

(PLCC)

1

2

3

V

–

C

REF

C

REF

1B1C1D1

F

1

G

1

E

1

BP/
GND

27

28

29

30

31

32

33

7

4

3

2

1

NC

TC7116CKW

TC7116ACKW

TC7117CKW

TC7117ACKW

12 13 14 15 17 18

G

44 43 42 41 39 3840

REF HI

COMMON

16

37

A/Z36BUFF35INT34V

19 20 21 22

D

26

8

25

9

24

10

23

11

IN HI

5
6

C

OSC

TEST

NC

NC

HLDR

3

3

D2C2B2A

2F2E2

NC

OSC

2

OSC

1

V

+

REFCREF

C

IN LO

–

2
3

A

3

G

3

POL
AB

4

E

3

F

3

B

3

(FLAT PACKAGE)

D

1

C

1

B

1

A

1F1G1E1

TC7116IPL

TC7116AIPL

TC7117CPL

TC7117ACPL

(PDIP)

1
2
3
4

OSC

1

5
6
7
8

9
10
11
12

TEST
V

COMMON

C

AZ

HLDR

D

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

2

C

2

B

2

A

2

F

2

E

2

D

3

B

3

F

3

E

3

AB

4

(MINUS SIGN)

10's

100's

1000's

(TC7116/7117)
(TC7116A/TC7117A)

100's

OSC

2

OSC

3

+
REF

V+
C

+
REF

C

–
REF

V

+
IN

V

–
IN

V

BUFF

V

INT

V

–

G
C
A
G
BP/GND

POL

3

3

3

2

D

1

C

1

B

1

A

1

F

1

G

1

E

1

1's

NOTES:

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.

+

+
–

+

–

HLDR

TC7116IJL

TC7116AIJL

TC7117IJL

TC7117AIJL

(CerDIP)

1
2
3
4

OSC

1

5
6
7
8

9
10
11
12

TEST
V

COMMON

C

AZ

HLDR

D

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

2

C

2

B

2

A

2

F

2

E

2

D

3

B

3

F

3

E

3

AB

4

(MINUS SIGN)

10's

100's

1000's

(TC7116/7117)
(TC7116A/TC7117A)

100's

OSC

2

OSC

3

+
REF

V+
C

+
REF

C

–
REF

V

+
IN

V

–
IN

V

BUFF

V

INT

V

–

G
C
A
G
BP/GND

POL

3

3

3

2

D

1

C

1

B

1

A

1

F

1

G

1

E

1

1's

PIN CONFIGURATIONS

3-1/2 DIGIT ANALOG-TO-DIGITAL

CONVERTERS WITH HOLD

3-207

TELCOM SEMICONDUCTOR, INC.

7

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3

1

2

8

PIN DESCRIPTION

40-Pin PDIP/ 44-Pin
40-PinCerDIP Plastic Quad

Pin Number Flat Package

Normal Pin Number Symbol Description

1 8 HLDR Hold pin, Logic 1 holds present display reading.
29D

1

Activates the D section of the units display.

310C

1

Activates the C section of the units display.

411B

1

Activates the B section of the units display.

512A

1

Activates the A section of the units display.

613F

1

Activates the F section of the units display.

714G

1

Activates the G section of the units display.

815E

1

Activates the E section of the units display.

916D

2

Activates the D section of the tens display.

10 17 C

2

Activates the C section of the tens display.

11 18 B

2

Activates the B section of the tens display.

12 19 A

2

Activates the A section of the tens display.

13 20 F

2

Activates the F section of the tens display.

14 21 E

2

Activates the E section of the tens display.

15 22 D

3

Activates the D section of the hundreds display.

16 23 B

3

Activates the B section of the hundreds display.

17 24 F

3

Activates the F section of the hundreds display.

18 25 E

3

Activates the E section of the hundreds display.

19 26 AB

4

Activates both halves of the 1 in the thousands display.
20 27 POL Activates the negative polarity display.
21 28 BP LCD backplane drive output (TC7116/TC7116A).

GND Digital ground (TC7117/TC7117A).

22 29 G

3

Activates the G section of the hundreds display.
23 30 A

3

Activates the A section of the hundreds display.
24 31 C

3

Activates the C section of the hundreds display.
25 32 G

2

Activates the G section of the tens display.
26 34 V

–

Negative power supply voltage.
27 35 V

INT

Integrator output. Connection point for integration

capacitor. See Integration Capacitor section for

additional details.
28 36 V

BUFF

Integration resistor connection. Use a 47 kΩ resistor for

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

full-scale range.
29 37 C

AZ

The size of the auto-zero capacitor influences system

noise. Use a 0.47 µF capacitor for 200 mV full scale and

a 0.047 µF capacitor for 2V full scale. See Auto-Zero

Capacitor paragraph for more details.
30 38 V

–

IN

The analog LOW input is connected to this pin.
31 39 V

+

IN

The analog HIGH input is connected to this pin.
39 40 COMMON This pin is primarily used to set the analog common-

mode COMMON voltage for battery operation or in

systems where the input signal is referenced to the

power supply. See Analog Common paragraph for more

details. It also acts as a reference voltage source.

TC7116

TC7116A

TC7117

TC7117A

3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD