ICL7135
®
Data Sheet
August 28, 2007
FN3093.4
4 1/2 Digit, BCD Output, A/D Converter
Features
The Intersil ICL7135 precision A/D converter, with its
multiplexed BCD output and digit drivers, combines dualslope conversion reliability with ±1 in 20,000 count accuracy
and is ideally suited for the visual display DVM/DPM market.
The 2.0000V full scale capability, auto-zero, and autopolarity are combined with true ratiometric operation, almost
ideal differential linearity and true differential input. All
necessary active devices are contained on a single CMOS
lC, with the exception of display drivers, reference, and a
clock.
• Accuracy Guaranteed to ±1 Count Over Entire ±20000
Counts (2.0000V Full Scale)
The ICL7135 brings together an unprecedented combination
of high accuracy, versatility, and true economy. It features
auto-zero to less than 10μV, zero drift of less than 1μV/oC,
input bias current of 10pA (Max), and rollover error of less
than one count. The versatility of multiplexed BCD outputs is
increased by the addition of several pins which allow it to
operate in more sophisticated systems. These include
STROBE, OVERRANGE, UNDERRANGE, RUN/HOLD and
BUSY lines, making it possible to interface the circuit to a
microprocessor or UART.
PART
NUMBER
PART
MARKING
ICL7135CPI
ICL7135CPI
• 1pA Typical Input Leakage Current
• True Differential Input
• True Polarity at Zero Count for Precise Null Detection
• Single Reference Voltage Required
• Overrange and Underrange Signals Available for AutoRange Capability
• All Outputs TTL Compatible
• Blinking Outputs Gives Visual Indication of Overrange
• Six Auxiliary Inputs/Outputs are Available for Interfacing to
UARTs, Microprocessors, or Other Circuitry
• Multiplexed BCD Outputs
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
Ordering Information
TEMP.
RANGE
(°C)
• Guaranteed Zero Reading for 0V Input
PACKAGE
0 to +70 28 Ld PDIP
ICL7135
(PDIP)
TOP VIEW
PKG.
DWG. #
E28.6
ICL7135CPIZ ICL7135CPIZ 0 to +70 28 Ld PDIP
E28.6
(Note 1)
(Pb-free) (Note 2)
V- 1
REFERENCE 2
NALOG COMMON 3
INT OUT 4
NOTES:
1. Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and
100% matte tin plate termination finish, which are RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the
Pb-free requirements of IPC/JEDEC J STD-020.
2. Pb-free PDIPs can be used for through hole wave solder
processing only. They are not intended for use in Reflow solder
processing applications.
AZ IN 5
27 OVERRANGE
26 STROBE
25 R/H
24 DIGITAL GND
BUFF OUT 6
23 POL
REF CAP - 7
22 CLOCK IN
REF CAP + 8
21 BUSY
IN LO 9
20 (LSD) D1
IN HI 10
19 D2
V+ 11
18 D3
(MSD) D5 12
17 D4
(LSB) B1 13
16 (MSB) B8
B2 14
1
28 UNDERRANGE
15 B4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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