ICL7136, ICL7137
1
3 / Digit LCD/LED, Low Power Display,
2
A/D Converters with Overrange Recovery
December 1997
Features
Description
The Intersil ICL7136 and ICL7137 are high performance, low
1
• First Reading Overrange Recovery in One Conversion
Period
power 3 / digit, A/D converters. Included are seven seg-
2
ment decoders, display drivers, a reference, and a clock.
The ICL7136 is designed to interface with a liquid crystal dis-
play (LCD) and includes a multiplexed backplane drive; the
ICL7137 will directly drive an instrument size, light emitting
diode (LED) display.
• 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 Display Drive
- LCD ICL7136
- LED lCL7137
• Low Noise - Less Than 15µV
• On Chip Clock and Reference
• No Additional Active Circuits Required
• Low Power - Less Than 1mW
The ICL7136 and ICL7137 bring together a combination of
high accuracy, versatility, and true economy. It features auto-
zero to less than 10µV, zero drift of less than 1µV/ C, input
P-P
o
bias current of 10pA (Max), and rollover error of less than
one count. True differential inputs and reference are useful in
all systems, but give the designer an uncommon advantage
when measuring load cells, strain gauges and other bridge
type transducers. Finally, the true economy of single power
supply operation (ICL7136), enables a high performance
panel meter to be built with the addition of only 10 passive
components and a display.
• Surface Mount Package Available
• Drop-In Replacement for ICL7126, No Changes Needed
Ordering Information
TEMP.
o
PART NUMBER RANGE ( C)
PACKAGE
40 Ld PDIP
PKG. NO.
ICL7136CPL
ICL7136RCPL
ICL7136CM44
ICL7137CPL
ICL7137RCPL
ICL7137CM44
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
0 to 70
E40.6
40 Ld PDIP (Note) E40.6
The ICL7136 and ICL7137 are improved versions of the
ICL7126, eliminating the overrange hangover and hysteresis
effects, and should be used in its place in all applications. It
can also be used as a plug-in replacement for the ICL7106
in a wide variety of applications, changing only the passive
components.
44 Ld MQFP
40 Ld PDIP
Q44.10x10
E40.6
40 Ld PDIP (Note) E40.6
44 Ld MQFP Q44.10x10
NOTE: “R” indicates device with reversed leads.
Pinouts
(PDIP)
(MQFP)
TOP VIEW
TOP VIEW
1
2
40 OSC 1
39 OSC 2
38 OSC 3
37 TEST
V+
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
3
4
(1’s)
5
36 REF HI
35 REF LO
44 43 42 41 40 39 38 37 36 35 34
6
1
NC
G2
C3
A3
G3
NC
NC
33
32
31
30
29
7
34
33
C
+
-
REF
REF
2
8
C
3
4
5
6
7
8
9
TEST
OSC 3
NC
9
32 COMMON
31 IN HI
30 IN LO
29 A-Z
10
11
12
13
14
15
16
17
18
19
20
(10’s)
OSC 2
OSC 1
V+
28
27
26
25
24
23
BP/GND
POL
AB4
E3
28 BUFF
27 INT
D1
26 V-
10
11
C1
F3
25 G2 (10’s)
24 C3
(100’s)
B1
B3
12 13 14 15 16 17 18 19 20 21 22
(100’s)
23 A3
22 G3
(1000) AB4
POL
21 BP/GND
A1 F1 G1 E1 D2 C2 B2 A2 F2 E2 D3
(MINUS)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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File Number 3086.2
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