ICL7129
1
4 / Digit LCD,
2
Single-Chip A/D Converter
August 1997
Features
Description
1
• ±19,999 Count A/D Converter Accurate to ±4 Count
• 10µV Resolution on 200mV Scale
• 110dB CMRR
• Direct LCD Display Drive
• True Differential Input and Reference
• Low Power Consumption
The Intersil ICL7129 is a very high performance 4 / -digit,
2
analog-to-digital converter that directly drives a multiplexed
liquid crystal display. This single chip CMOS integrated cir-
cuit requires only a few passive components and a reference
to operate. It is ideal for high resolution hand-held digital
multimeter applications.
• Decimal Point Drive Outputs
• Overrange and Underrange Outputs
• Low Battery Detection and Indication
• 10:1 Range Change Input
The performance of the ICL7129 has not been equaled
before in a single chip A/D converter. The successive integra-
tion technique used in the ICL7129 results in accuracy better
than 0.005% of full scale and resolution down to 10µV/count.
The ICL7129, drawing only 1mA from a 9V battery, is well
suited for battery powered instruments. Provision has been
made for the detection and indication of a “LOW/BATTERY”
condition. Autoranging instruments can be made with the
ICL7129 which provides overrange and underrange outputs
and 10:1 range changing input. The ICL7129 instantly checks
for continuity, giving both a visual indication and a logic level
output which can enable an external audible transducer. These
features and the high performance of the ICL7129 make it an
extremely versatile and accurate instrument-on-a-chip.
Ordering Information
TEMP.
o
PART NUMBER RANGE ( C)
PACKAGE
40 Ld PDIP
40 Ld PDIP
44 Ld MQFP
PKG. NO.
E40.6
ICL7129CPL
ICL7129RCPL
ICL7129CM44
0 to 70
0 to 70
0 to 70
E40.6
Q44.10x10
NOTE: “R” indicates device with reversed leads.
Pinouts
ICL7129 (PDIP)
ICL7129 (MQFP)
TOP VIEW
TOP VIEW
1
2
40 OSC2
OSC1
OSC3
39 DP
1
ANNUNCIATOR
3
38 DP
2
DRIVE
4
37 RANGE
36 DGND
35 REF LO
34 REF HI
33 IN HI
B , C , CONT
1
1
5
A , G , D
1
1
1
6
44 43 42 41 40 39 38 37 36 35 34
F , E , DP
1
1
1
1
2
3
4
5
6
7
8
9
V+
V-
DGND
33
32
31
30
29
7
B , C , LO BAT
2
2
RANGE
8
A , G , D
2
2
2
NC
NC
LATCH/
HOLD
DP
DP
2
9
32 IN LO
31 BUFF
F , E , DP
2
2
2
1
10
11
12
13
14
15
16
17
18
19
20
B , C , MINUS
3
3
OSC 2
OSC 1
OSC 3
NC
30
29
C
C
A , G , D
REF-
3
3
3
3
5
4
28
27
26
25
24
23
DP /UR
3
F , E , DP
REF+
3
3
DP /OR
4
28 COMMON
B , C , BC
4
4
V
DISP
27 CONTINUITY
26 INT OUT
25 INT IN
A , D , G
4
4
NC
ANNUNCE
DRIVE
BP1
BP2
BP3
F , E , DP
4
4
4
10
11
BP3
B , C , CONT
1
1
12 13 14 15 16 17 18 19 20 21 22
24 V+
BP2
BP1
23 V-
22 LATCH/HOLD
V
DISP
21 DP /UR
3
DP /OR
4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
File Number 3085.1
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