ICL7129
August 1997
4
1
/
2
Digit LCD,
Single-Chip A/D Converter
Description
The Intersil ICL7129 is a very high performance 4
1
/
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 10碌V/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 鈥淟OW/BATTERY鈥?/div>
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.
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵19,999
Count A/D Converter Accurate to
鹵4
Count
10碌V 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
PART NUMBER
ICL7129CPL
ICL7129RCPL
ICL7129CM44
TEMP.
RANGE (
o
C)
0 to 70
0 to 70
0 to 70
PACKAGE
40 Ld PDIP
40 Ld PDIP
44 Ld MQFP
PKG. NO.
E40.6
E40.6
Q44.10x10
NOTE: 鈥淩鈥?indicates device with reversed leads.
Pinouts
ICL7129 (PDIP)
TOP VIEW
OSC1 1
OSC3 2
ANNUNCIATOR 3
DRIVE
B
1
, C
1
, CONT 4
A
1
, G
1
, D
1
5
F
1
, E
1
, DP
1
6
DISPLAY OUTPUT LINES
B
2
, C
2
, LO BAT 7
A
2
, G
2
, D
2
8
F
2
, E
2
, DP
2
9
B
3
, C
3
, MINUS 10
A
3
, G
3
, D
3
11
F
3
, E
3
, DP
3
12
B
4
, C
4
, BC
5
13
A
4
, D
4
, G
4
14
F
4
, E
4
, DP
4
15
BP3 16
BP2 17
BP1 18
V
DISP
19
DP
4
/OR 20
40 OSC2
39 DP
1
38 DP
2
37 RANGE
36 DGND
35 REF LO
34 REF HI
33 IN HI
32 IN LO
31 BUFF
30 C
REF-
29 C
REF+
28 COMMON
27 CONTINUITY
26 INT OUT
25 INT IN
24 V+
23 V-
22 LATCH/HOLD
B
2
, C
2
, LO BAT
B
3
, C
3
, MINUS
A
1
, G
1
, D
1
F
1
, E
1
, DP
1
A
2
, G
2
, D
2
F
2
, E
2
, DP
2
A
3
, G
3
, D
3
F
3
, E
3
, DP
3
B
4
, C
4
, BC
5
A
4
, D
4
, G
4
21 DP
3
/UR
F
4
, E
4
, DP
4
DGND
RANGE
DP
2
DP
1
OSC 2
OSC 1
OSC 3
NC
NC
ANNUNCE
DRIVE
B
1
, C
1
, CONT
1
44 43 42 41 40 39 38 37 36 35 34
33
2
32
3
4
5
6
7
8
9
31
30
29
28
27
26
25
V+
V-
NC
NC
LATCH/
HOLD
DP
3
/UR
DP
4
/OR
V
DISP
BP1
BP2
BP3
ICL7129 (MQFP)
TOP VIEW
CONTINUITY
COMMON
INT OUT
REF LO
REF HI
C
REF
+
C
REF
-
24
10
11
23
12 13 14 15 16 17 18 19 20 21 22
INT IN
BUFF
IN LO
IN HI
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
|
Copyright
漏
Intersil Corporation 1999
File Number
3085.1
3-31
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