Texas Instruments ICL7135CN Datasheet

0°C to 70°C

ICL7135C, TLC7135C

4 1/2-DIGIT PRECISION

ANALOG-TO-DIGITAL CONVERTERS

SLAS074B – DECEMBER 1986 – REVISED MA Y 1999

D

Zero Reading for 0-V Input

D

Precision Null Detection With True Polarity
at Zero

D

1-pA Typical Input Current

D

True Differential Input

D

Multiplexed Binary-Coded-Decimal (BCD)
Output

D

Low Rollover Error: ±1 Count Max

D

Control Signals Allow Interfacing With
UARTs or Microprocessors

D

Autoranging Capability With Over-and
Under-Range Signals

D

TTL-Compatible Outputs

D

Direct Replacement for Teledyne TSC7135,
Intersil ICL7135, Maxim ICL7135, and

ANLG COMMON

AUTO ZERO

BUFF OUT

DW OR N PACKAGE

V

CC–

REF

INT OUT

C

ref–

C

ref+

IN–
IN+

V

CC+

D5
B1

B2

(TOP VIEW)

1

28

2

27

3

26

4

25

5

24

6

23

7

22

8

21

9

20

10

19

11

18

12

17

13

16

14

15

UNDER RANGE
OVER RANGE
STROBE
RUN/HOLD
DGTL GND
POLARITY
CLK
BUSY
D1
D2
D3
D4
B8
B4

Siliconix Si7135

D

CMOS Technology

description

The ICL7135C and TLC7135C converters are manufactured with Texas Instruments highly efficient CMOS
technology. These 4 1/2-digit, dual-slope-integrating, analog-to-digital converters (DACs) are designed to
provide interfaces to both a microprocessor and a visual display. The digit-drive outputs D1 through D4 and
multiplexed binary-coded-decimal outputs B1, B2, B4, and B8 provide an interface for LED or LCD
decoder/drivers as well as microprocessors.

The ICL7135C and TLC7135C offer 50-ppm (one part in 20,000) resolution with a maximum linearity error of
one count. The zero error is less than 10 µV and zero drift is less than 0.5 µV/°C. Source-impedance errors are
minimized by low input current (less than 10 pA). Rollover error is limited to ±1 count.

The BUSY, STROBE

, RUN/HOLD, OVER RANGE, and UNDER RANGE control signals support
microprocessor-based measurement systems. The control signals also can support remote data acquisition
systems with data transfer through universal asynchronous receiver transmitters (UARTs).

The ICL7135C and TLC7135C are characterized for operation from 0°C to 70°C.

AVAILABLE OPTIONS

PACKAGE

T

A

°

°

Caution. These devices have limited built-in protection. The leads should be shorted together or the device placed in conductive foam
during storage or handlilng to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PLASTIC DIP

(N)

ICL7135CN
TLC7135CN TLC7135CDW

SMALL OUTLINE

(DW)

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

1

ICL7135C, TLC7135C
4 1/2-DIGIT PRECISION
ANALOG-TO-DIGITAL CONVERTERS

SLAS074B – DECEMBER 1986 – REVISED MA Y 1999

functional block diagram

DIGITAL SECTION

POLARITY

From Analog

Section

CLK

RUN/HOLD

OVER RANGE

UNDER RANGE

STROBE

BUSY

DGTL GND

2

REF

10

IN+

23

22
25

27
28

26
21

24

A/Z

INT

Polarity

Flip-Flop

Zero

Cross

Detect

8

C

ref+

DE(–)

Control

Logic

C

ref

Counters

ANALOG SECTION

C

DE(+)

ref–

7

Input
High

BUFF
OUT

Buffer

–

+

Z/I

Latch

Latch

Latch

Latch

Latch

6

20

D1 (LSD)

19

D2

18

D3

17

D4

12

D5 (MSD)

Multiplexer

13

B1 (LSB)

14

B2

15

B4

16

B8 (MSB)

R

INT

5

C

AZ

AUTO
ZERO

Integrator

–

+

A/Z

INT OUT

4

C

INT

Comparator

+

–

Digit
Drive
Output

Binary
Coded
Decimal
Output

To
Digital
Section

ANLG
COMMON

2

IN–

A/Z

A/Z

DE(+) DE(–)

3

9

INT

A/Z, DE(

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±), Z/I

Input
Low

VOHHigh-level output voltage

V

IIInput leakage current, IN– and IN

V

0

pA

I

Positive supply current

f

0

mA

I

Negative supply current

f

0

mA

ICL7135C, TLC7135C

4 1/2-DIGIT PRECISION

ANALOG-TO-DIGITAL CONVERTERS

SLAS074B – DECEMBER 1986 – REVISED MA Y 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage (V
Analog input voltage (IN– or IN+) V
Reference voltage range V
Clock input voltage range 0 V to V
Operating free-air temperature range, T
Storage temperature range, T

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: N package 260°C. . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond 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 beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

with respect to V

CC+

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

) 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC–

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

A

CC–
CC–

to V
to V

CC+
CC+
CC+

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V
Supply voltage, V
Reference voltage, V
High-level input voltage, CLK, RUN/HOLD, V
Low-level input voltage, CLK, RUN/HOLD, V
Differential input voltage, V
Maximum operating frequency, f
Operating free-air temperature range, T

NOTE 1: Clock frequency range extends down to 0 Hz.

CC+
CC–

ref

IH

IL

ID

(see Note 1) 1.2 2 MHz

clock

A

4 5 6 V

–3 –5 –8 V

1 V

2.8 V

0.8 V

V

+1 V

CC–

0 70 °C

–0.5 V

CC+

†

electrical characteristics, V

CC+

= 5 V, V

CC–

= 5 V, V

ref

otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

p

V

OL

V

ON(PP)

α

VO

I

IH

I

IL

CC+

CC–

C

pd

NOTES: 2. This is the peak-to-peak value that is not exceeded 95% of the time.

Low-level output voltage IO = 1.6 mA 0.4 V
Peak-to-peak output noise voltage (see Note 2) VID = 0, Full scale = 2 V 15 µV
Zero-reading temperature coefficient of output voltage VID = 0, 0°C ≤ TA ≤ 70°C 0.5 2 µV/°C
High-level input current VI = 5 V, 0°C ≤TA ≤ 70°C 0.1 10 µA
Low-level input current VI = 0 V, 0°C ≤TA ≤ 70°C –0.02 –0.1 mA

p

pp

pp

Power dissipation capacitance See Note 3 40 pF

3. Factor-relating clock frequency to increase in supply current. At V

D1-D5,B1,B2,B4,B8 IO = –1 mA 2.4 5
Other outputs IO = –10 µA 4.9 5

+

ID

clock

clock

CC+

= 1 V, f

TA = 25°C 1 10

=

0°C ≤ TA ≤ 70°C 250
TA = 25°C 1 2

=

0°C ≤ TA ≤ 70°C 3
TA = 25°C –0.8 –2

=

0°C ≤ TA ≤ 70°C –3

= 5 V, I

= 120 kHz, TA = 25°C (unless

clock

CC+

= I

CC+(fclock

= 0) + Cpd × 5 V × f

p

clock

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3

ICL7135C, TLC7135C

Display reading in ratiometric operation

g

4 1/2-DIGIT PRECISION
ANALOG-TO-DIGITAL CONVERTERS

SLAS074B – DECEMBER 1986 – REVISED MA Y 1999

operating characteristics, V

= 5 V, VCC– = 5 V, V

CC+

= 1 V, f

ref

= 120 kHz, TA = 25°C (unless

clock

otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

α

Full-scale temperature coefficient (see Note 4) VID = 2 V, 0°C ≤ TA ≤ 70°C 5 ppm/°C

FS

E

Linearity error –2 V ≤VID ≤ 2 V 0.5 count

L

E

Differential linearity error (see Note 5) –2 V ≤VID ≤ 2 V 0.01 LSB

D

E

± Full-scale symmetry error (rollover error) (see Note 6) VID = ±2 V 0.5 1 count

FS

Display reading with 0-V input VID = 0, 0°C ≤TA ≤ 70°C –0.0000 ±0.0000 0.0000

p

NOTES: 4. This parameter is measured with an external reference having a temperature coefficient of less than 0.01 ppm/°C.

5. The magnitude of the difference between the worst case step of adjacent counts and the ideal step.

6. Rollover error is the difference between the absolute values of the conversion for 2 V and –2 V.

p

VID = V
0°C ≤ TA ≤ 70°C 0.9995 0.9999 1.0005

, TA = 25°C 0.9998 0.9999 1.0000

ref

timing diagrams

End of Conversion

†

BUSY

B1–B8

D5D1D2D3D4D5

Digital

Reading

Digital

Reading

STROBE

†

†

200 Counts

D5

201 Counts

D4

200 Counts

D3

200 Counts

D2

200 Counts

D1

200 Counts

Delay between BUSY going low and the first STROBE

Figure 1

200 Counts

pulse is dependent upon the analog input.

4

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