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Intersil Electronic Components Datasheet



ICL7129

41/2 Digit LCD/ Single-Chip A/D Converter



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ICL7129 pdf
ICL7129
August 1997
41/2 Digit LCD,
Single-Chip A/D Converter
Features
±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
• Decimal Point Drive Outputs
• Overrange and Underrange Outputs
• Low Battery Detection and Indication
• 10:1 Range Change Input
Ordering Information
TEMP.
PART NUMBER RANGE (oC) PACKAGE
ICL7129CPL
0 to 70 40 Ld PDIP
ICL7129RCPL
0 to 70 40 Ld PDIP
ICL7129CM44
0 to 70 44 Ld MQFP
NOTE: “R” indicates device with reversed leads.
PKG. NO.
E40.6
E40.6
Q44.10x10
Description
The Intersil ICL7129 is a very high performance 41/2-digit,
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.
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.
Pinouts
ICL7129 (PDIP)
TOP VIEW
OSC1 1
OSC3 2
ANNUNCIATOR
DRIVE
3
B1, C1, CONT 4
A1, G1, D1 5
F1, E1, DP1 6
B2, C2, LO BAT 7
A2, G2, D2 8
F2, E2, DP2 9
B3, C3, MINUS 10
A3, G3, D3 11
F3, E3, DP3 12
B4, C4, BC5 13
A4, D4, G4 14
F4, E4, DP4 15
BP3 16
BP2 17
BP1 18
VDISP 19
DP4/OR 20
40 OSC2
39 DP1
38 DP2
37 RANGE
36 DGND
35 REF LO
34 REF HI
33 IN HI
32 IN LO
31 BUFF
30 CREF-
29 CREF+
28 COMMON
27 CONTINUITY
26 INT OUT
25 INT IN
24 V+
23 V-
22 LATCH/HOLD
21 DP3/UR
ICL7129 (MQFP)
TOP VIEW
DGND
RANGE
DP2
DP1
OSC 2
OSC 1
OSC 3
NC
NC
ANNUNCE
DRIVE
B1, C1, CONT
144 43 42 41 40
39
38
37 36
35 34
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
V+
V-
NC
NC
LATCH/
HOLD
DP3/UR
DP4/OR
VDISP
BP1
BP2
BP3
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
3-31
File Number 3085.1



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ICL7129 pdf
Functional Block Diagram
OSC1
OSC2
OSC3
ICL7129
LOW BATTERY CONTINUITY
SEGMENT DRIVES
BACKPLANE
DRIVES
ANNUNCIATOR DRIVE
LATCH, DECODE DISPLAY MULTIPLEXER
VDISP
UP/DOWN RESULTS COUNTER
SEQUENCE COUNTER/DECODER
CONTROL LOGIC
ANALOG SECTION
RANGE L/H CONT
V+ V- DGND
Typical Application Schematic
LOW BATTERY CONTINUITY
OR UR DP2 DP1
DP3 DP3
V+
5pF (MICA)
ICL7129
120kHz
560pF
1.2k
0.1µF
+
1.0µF
150k
+ 10k
9V
-
20K
0.1µF
100k
-+
VIN
ICL8069
270K
10pF (MICA)
V+
6.8µF
3-32



Part Number ICL7129
Description 41/2 Digit LCD/ Single-Chip A/D Converter
Maker Intersil - Intersil
Total Page 11 Pages
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