ICL8052A/ICL71C03, ICL8068A/ICL71C03
Functional Block Diagram
0.22µF
10kΩ
90kΩ
100kΩ
+15V -15V
SEVEN-
SEGMENT
DECODER
-BUF IN BUF OUT -INT IN INT OUT
REF
OUT
8
7
1
10
BUFFER
9
11
INTEG.
14
COMP.
6
3
INT.
REF.
-
-
A1
+
A2
-
300pF
D
D
D
D
D
1
5
4
3
2
+
A3
10kΩ
3
19
24
25
26
27
ICL8052A/8068A
+
B
1
20
21
22
-1.2V
5
+INT IN 12
2
MSD
LSD
1kΩ
+BUF IN 13
B
2
COMP
OUT
B
B
MULTIPLEXER
10µF
3
4
10µF (TYP)
REF
1µF (TYP)
23
REF
CAP 1
AZ OUT
AZ IN
CAP 2
COMP IN
16
17
5
8
9
LATCH
LATCH
LATCH
LATCH
LATCH
REF
7
4
ZERO
ANALOG
INPUT
2
5
CROSSING
DETECTOR
SW3
COUNTERS
10kΩ
0.1µF
10
11
1
6
CONTROL LOGIC
ICL71C03
ANALOG
GND
1
15
6
4
12
2
14
13
18
28
RUN/
HOLD
CLOCK 4 1/2 DIGIT/ OVER UNDER STROBE BUSY
IN RANGE RANGE
3 1/2 DIGIT
+5V
-15V
FIGURE 1.
2
ETC [ ETC ]
