Analog-to-Digital Converters. ICL7135CN Datasheet

ICL7135CN Converters. Datasheet pdf. Equivalent


etcTI ICL7135CN
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 − 1
REF 2
ANLG COMMON 3
INT OUT 4
AUTO ZERO 5
BUFF OUT 6
Cref − 7
Cref + 8
IN − 9
IN + 10
VCC + 11
D5 12
B1 13
B2 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


ICL7135CN Datasheet
Recommendation ICL7135CN Datasheet
Part ICL7135CN
Description Analog-to-Digital Converters
Feature ICL7135CN; D Zero Reading for 0-V Input D Precision Null Detection With True Polarity at Zero D 1-pA Typical In.
Manufacture etcTI
Datasheet
Download ICL7135CN Datasheet




etcTI ICL7135CN
ICL7135C, TLC7135C
4 1/2ĆDIGIT PRECISION
ANALOGĆTOĆDIGITAL CONVERTERS
SLAS074D − DECEMBER 1986 − REVISED SEPTEMBER 2003
FUNCTIONAL BLOCK DIAGRAM
23
POLARITY
From Analog
Section
Polarity
Flip-Flop
DIGITAL SECTION
Latch
22
CLK
25
RUN/HOLD 27
OVER RANGE
28
UNDER RANGE
26
STROBE
21
BUSY 24
DGTL GND
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
A/Z
REF 2
INT
IN + 10
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
INT
9
IN −
A/Z
DE(+) DE(−)
A/Z, DE( ±), Z/I
Input
Low
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265



etcTI ICL7135CN
ICL7135C, TLC7135C
4 1/2ĆDIGIT PRECISION
ANALOGĆTOĆDIGITAL CONVERTERS
SLAS074D − DECEMBER 1986 − REVISED SEPTEMBER 2003
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
Supply voltage (VCC+ with respect to VCC −)
Analog input voltage (IN − or IN +)
Reference voltage range
Clock input voltage range
Operating free-air temperature range, TA
Storage temperature range, Tstg
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: N package
UNIT
15 V
VCC to VCC+
VCC to VCC+
0 V to VCC+
0°C to 70°C
−65°C to 150°C
260°C
(1) 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.
RECOMMENDED OPERATING CONDITIONS
Supply voltage, VCC+
Supply voltage, VCC−
Reference voltage, Vref
High-level input voltage, CLK, RUN/HOLD, VIH
Low-level input voltage, CLK, RUN/HOLD, VIL
Differential input voltage, VID
Maximum operating frequency, fclock (see Note 1)
Operating free-air temperature range, TA
NOTE 1: Clock frequency range extends down to 0 Hz.
MIN
4
−3
2.8
VCC +1
1.2
0
NOM
5
−5
1
MAX
6
−8
0.8
VCC+ − 0.5
2
70
UNIT
V
V
V
V
V
V
MHz
°C
ELECTRICAL CHARACTERISTICS
VCC + = 5 V, VCC = 5 V, Vref = 1 V, fclock = 120 kHz, TA = 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
VOH
High-level output voltage
D1-D5, B1,B2,B4,B8
Other outputs
IO = − 1 mA
IO = − 10 µA
2.4
5
V
4.9
5
VOL
VON(PP)
αVO
Low-level output voltage
Peak-to-peak output noise voltage (see Note 1)
Zero-reading temperature coefficient of output voltage
IO = 1.6 mA
VID = 0, Full scale = 2 V
VID = 0, 0°C TA 70°C
0.4 V
15
µV
0.5
2 µV/°C
IIH
High-level input current
VI = 5 V, 0°C TA 70°C
0.1
10 µA
IIL
II
ICC +
ICC
Low-level input current
Input leakage current, IN − and IN +
Positive supply current
Negative supply current
VI = 0 V,
VID = 0
fclock = 0
fclock = 0
0°C TA 70°C
TA = 25°C
0°C TA 70°C
TA = 25°C
0°C TA 70°C
TA = 25°C
0°C TA 70°C
−0.02 −0.1 mA
1
10
pA
250
1
2
mA
3
− 0.8
−2
mA
−3
Cpd
Power dissipation capacitance
See Note 2
40
pF
NOTES: 1. This is the peak-to-peak value that is not exceeded 95% of the time.
2. Factor-relating clock frequency to increase in supply current. At VCC+ = 5 V, ICC+ = ICC+(fclock = 0) + Cpd × 5 V × fclock
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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