ICL7136, ICL7137
December 1997
31/2 Digit LCD/LED, Low Power Display,
A/D Converters with Overrange Recovery
Features
• First Reading Overrange Recovery in One Conversion
Period
• 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 15µVP-P
• On Chip Clock and Reference
• No Additional Active Circuits Required
• Low Power - Less Than 1mW
• Surface Mount Package Available
• Drop-In Replacement for ICL7126, No Changes Needed
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICL7136CPL
0 to 70 40 Ld PDIP
ICL7136RCPL
0 to 70 40 Ld PDIP (Note)
ICL7136CM44
0 to 70 44 Ld MQFP
ICL7137CPL
0 to 70 40 Ld PDIP
ICL7137RCPL
0 to 70 40 Ld PDIP (Note)
ICL7137CM44
0 to 70 44 Ld MQFP
NOTE: “R” indicates device with reversed leads.
PKG. NO.
E40.6
E40.6
Q44.10x10
E40.6
E40.6
Q44.10x10
Description
The Intersil ICL7136 and ICL7137 are high performance, low
power 31/2 digit, A/D converters. Included are seven seg-
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.
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/oC, input
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.
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.
Pinouts
(PDIP)
TOP VIEW
V+
D1
C1
B1
(1’s) A1
F1
G1
E1
D2
C2
B2
(10’s)
A2
F2
E2
D3
B3
(100’s)
F3
E3
(1000) AB4
(MINUS) POL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 OSC 1
39 OSC 2
38 OSC 3
37 TEST
36 REF HI
35 REF LO
34 CREF+
33 CREF-
32 COMMON
31 IN HI
30 IN LO
29 A-Z
28 BUFF
27 INT
26 V-
25 G2 (10’s)
24 C3
23 A3 (100’s)
22 G3
21 BP/GND
(MQFP)
TOP VIEW
NC
NC
TEST
OSC 3
NC
OSC 2
OSC 1
V+
D1
C1
B1
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 30
5 29
6 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
NC
G2
C3
A3
G3
BP/GND
POL
AB4
E3
F3
B3
A1 F1 G1 E1 D2 C2 B2 A2 F2 E2 D3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1
File Number 3086.2
Free Datasheet http://www.datasheetlist.com/
