ICL-7107 Intersil, ICL-7107 Datasheet - Page 13

• Manufacturer Part Number: ICL-7107
• Description: 31/2 Digit/ LCD/LED Display/ A/D Converters
• Manufacturer: Intersil

Typical Applications
The resistor values within the bridge are determined by the desired
sensitivity.
O /RANGE
U /RANGE
FIGURE 17. ICL7107 MEASUREING RATIOMETRIC VALUES OF
FIGURE 19. CIRCUIT FOR DEVELOPING UNDERRANGE AND
CD4023 OR
74C10
COMMON
REF LO
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
GND
QUAD LOAD CELL
OVERRANGE SIGNAL FROM ICL7106 OUTPUTS
REF
REF
A-Z
INT
G2
G3
V -
C3
A3
TO LOGIC
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V
V+
CC
CD4077
TO DISPLAY
100pF
0.22 F
100k
0.1 F
47k
TO PIN 1
10
11
12
13
14
15
16
17
18
19
20
0.47 F
1
2
3
4
5
6
7
8
9
(Continued)
V+
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
ICL7106, ICL7107, ICL7106S, ICL7107S
COMMON
REF LO
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
V+
REF
REF
A-Z
INT
BP
G2
G3
C3
A3
V-
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
LOGIC
GND
TO
V-
13
A silicon diode-connected transistor has a temperature coefficient of
about -2mV/
transistor in ice water and adjusting the zeroing potentiometer for a
000.0 reading. The sensor should then be placed in boiling water
and the scale-factor potentiometer adjusted for a 100.0 reading.
FIGURE 18. ICL7106 USED AS A DIGITAL CENTIGRADE
FIGURE 20. CIRCUIT FOR DEVELOPING UNDERRANGE AND
The LM339 is required to
ensure logic compatibility
with heavy display loading.
O /RANGE
U /RANGE
CD4023 OR
COMMON
74C10
REF LO
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
o
REF
REF
A-Z
INT
BP
THERMOMETER
OVERRANGE SIGNALS FROM ICL7107 OUTPUT
V -
G2
C3
A3
G3
C. Calibration is achieved by placing the sensing
TO LOGIC
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V
0.1 F
CC
0.01 F
12k
TO DISPLAY
0.22 F
+
+
+
+
-
-
-
-
100k
100pF
+5V
TO PIN 1
47k
0.47 F
TO BACKPLANE
100k
100k 220k
33k
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
SCALE
FACTOR
ADJUST
ZERO
ADJUST
V+
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
1M
9V
COMMON
22k
SILICON NPN
MPS 3704 OR
SIMILAR
REF LO
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
REF
REF
A-Z
INT
BP
G2
C3
A3
G3
V-
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V-