1
®
FN3084.5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ICL7126
3 1/2 Digit, Low Power, Single Chip A/D
Converter
The ICL7126 is a high performance, very low power
3
1
/
2
-digit, A/D converter. All the necessary active devices
are contained on a single CMOS IC, including seven
segment decoders, display drivers, reference, and clock. The
ICL7126 is designed to interface with a liquid crystal display
(LCD) and includes a backplane drive. The supply current of
100µA is ideally suited for 9V battery operation.
The ICL7126 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/
o
C,
input bias current of 10pA maximum, and rollover error of
less than one count. The versatility of true differential input
and reference is useful in all systems, but gives the designer
an uncommon advantage when measuring load cells, strain
gauges and other bridge-type transducers. And finally the
true economy of single power operation allows a high
performance panel meter or multi-meter to be built with the
addition of only 10 passive components and a display.
The ICL7126 can be used as a plug-in replacement for the
ICL7106 in a wide variety of applications, changing only the
passive components.
Features
• 8,000 Hours Typical 9V Battery Life
• Guaranteed Zero Reading for 0V Input on All Scales
• True Polarity at Zero for Precise Null Detection
• 1pA Typical Input Current
• True Differential Input and Reference
• Direct LCD Display Drive - No External Components
Required
• Pin Compatible With the ICL7106
• Low Noise - Less Than 15µV
P-P
• On-Chip Clock and Reference
• Low Power Dissipation Guaranteed Less Than 1mW
• No Additional Active Circuits Required
• Pb-Free Available (RoHS Compliant)
Pinout
ICL7126 (PDIP)
TOP VIEW
Ordering Information
PART NUMBER
TEMP. RANGE
(°C) PACKAGE
PKG.
DWG. #
ICL7126CPL 0 to 70 40 Ld PDIP E40.6
ICL7126CPLZ
(Note 1)
0 to 70 40 Ld PDIP
(Pb-free) (Note 2)
E40.6
NOTES:
1. Intersil Pb-free 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-020C.
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.
13
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
20
V+
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
(1000) AB4
POL
28
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
21
OSC 1
OSC 2
OSC 3
TEST
REF HI
REF LO
C
REF
+
C
REF
-
COMMON
IN HI
IN LO
A-Z
BUFF
INT
V-
G2 (10s)
C3
A3
G3
BP/GND
(1s)
(10s)
(100s)
(MINUS)
(100s)
Data Sheet October 25, 2004
