ICL7135C Converters Datasheet

ICL7135C Datasheet, PDF, Equivalent


Part Number

ICL7135C

Description

Analog-to-Digital Converters

Manufacture

etcTI

Total Page 17 Pages
Datasheet
Download ICL7135C Datasheet


ICL7135C
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 Second Source to Teledyne TSC7135,
Intersil ICL7135, Maxim ICL7135, and
Siliconix Si7135
D CMOS Technology
ICL7135C, TLC7135C
4 1/2ĆDIGIT PRECISION
ANALOGĆTOĆDIGITAL CONVERTERS
SLAS074D − DECEMBER 1986 − REVISED SEPTEMBER 2003
DW OR N PACKAGE
(TOP VIEW)
VCC −
REF
ANLG COMMON
INT OUT
AUTO ZERO
BUFF OUT
Cref −
Cref +
IN −
IN +
VCC +
D5
B1
B2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 UNDER RANGE
27 OVER RANGE
26 STROBE
25 RUN/HOLD
24 DGTL GND
23 POLARITY
22 CLK
21 BUSY
20 D1
19 D2
18 D3
17 D4
16 B8
15 B4
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 (ADCs) 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.
TA
0°C to 70°C
AVAILABLE OPTIONS
PACKAGE
PLASTIC DIP
(N)
SMALL OUTLINE
(DW)
ICL7135CN
TLC7135CN
TLC7135CDW
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.
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.
Copyright 1999−2003, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1

ICL7135C
ICL7135C, TLC7135C
4 1/2ĆDIGIT PRECISION
ANALOGĆTOĆDIGITAL CONVERTERS
SLAS074D − DECEMBER 1986 − REVISED SEPTEMBER 2003
FUNCTIONAL BLOCK DIAGRAM
POLARITY
From Analog
Section
23
Polarity
Flip-Flop
DIGITAL SECTION
Latch
CLK
RUN/HOLD
OVER RANGE
UNDER RANGE
STROBE
BUSY
DGTL GND
22
25
27
28
26
21
24
Zero
Cross
Detect
Control
Logic
Counters
Latch
Latch
Latch
Latch
20
D1 (LSD)
19 D2
18 D3
17
D4
12
D5 (MSD)
Digit
Drive
Output
Multiplexer
13
B1 (LSB)
14
B2
15
B4
16
B8 (MSB)
Binary
Coded
Decimal
Output
REF 2
IN + 10
A/Z
INT
ANALOG SECTION
Cref
8 Cref +
Cref − 7
BUFF
OUT 6
RINT
5
CAZ
AUTO
ZERO
CINT
4 INT OUT
Buffer
Input
High
DE(−) DE(+)
Z/I
Integrator
A/Z
Comparator
+
To
Digital
Section
A/Z
ANLG
3
COMMON
9
IN −
INT
DE(+) DE(−)
A/Z
A/Z, DE( ±), Z/I
Input
Low
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Features D Zero Reading for 0-V Input D Precision Null Detection With True Polarity at Z ero D 1-pA Typical Input Current D True Differential Input D Multiplexed Binar y-Coded-Decimal (BCD) Output D Low Roll over Error: ± 1 Count Max D Control Si gnals Allow Interfacing With UARTs or M icroprocessors D Autoranging Capability With Over- and Under-Range Signals D T TL-Compatible Outputs D Second Source t o Teledyne TSC7135, Intersil ICL7135, M axim ICL7135, and Siliconix Si7135 D CM OS Technology ICL7135C, TLC7135C 4 1/2 ĆDIGIT PRECISION ANALOGĆTOĆDIGITAL C ONVERTERS SLAS074D − DECEMBER 1986 REVISED SEPTEMBER 2003 DW OR N PACKAG E (TOP VIEW) VCC − REF ANLG COMMON I NT OUT AUTO ZERO BUFF OUT Cref − Cref + IN − IN + VCC + D5 B1 B2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 UNDER RANG E 27 OVER RANGE 26 STROBE 25 RUN/HOLD 2 4 DGTL GND 23 POLARITY 22 CLK 21 BUSY 2 0 D1 19 D2 18 D3 17 D4 16 B8 15 B4 DES CRIPTION The ICL7135C and TLC7135C con verters are manufactured with Texas Instruments highly efficient CMOS technol.
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