ICL7106_14 Datasheet, PDF (14/17 Pages) Intersil Corporation – 31/2 Digit, LCD/LED Display, A/D Converters

ICL7106, ICL7107, ICL7107S
Typical Applications (Continued)
O/RANGE
U/RANGE
V+
TO LOGIC
V_CC
1 V+
2 D1
3 C1
4 B1
5 A1
6 F1
7 G1
8 E1
9 D2
10 C2
11 B2
12 A2
13 F2
14 E2
15 D3
16 B3
17 F3
18 E3
19 AB4
20 POL
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35 _TO
C_REF
34
LOGIC
GND
C_REF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26 V-
G2 25
C3 24
A3 23
G3 22
BP 21
CD4023 OR
74C10
CD4077
FIGURE 19. CIRCUIT FOR DEVELOPING UNDERRANGE AND
OVERRANGE SIGNAL FROM ICL7106 OUTPUTS
+5V
1 V+
2 D1
3 C1
4 B1
5 A1
TO LOGIC
V_CC
6 F1
7 G1
8 E1
12kΩ
9 D2
The LM339 is required to
ensure logic compatibility
with heavy display loading.
10 C2
11 B2
12 A2
LM339
13 F2
+_-
14 E2
15 D3
O/RANGE
16 B3
+_-
17 F3
+_-
18 E3
19 AB4
U/RANGE
CD4023 OR
74C10
+^-
20 POL
33kΩ
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
C_REF 34
C_REF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26 V-
G2 25
C3 24
A3 23
G3 22
BP 21
FIGURE 20. CIRCUIT FOR DEVELOPING UNDERRANGE AND
OVERRANGE SIGNALS FROM ICL7107 OUTPUT
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
C_REF 34
C_REF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
BP 21
TO PIN 1
100kΩ
100pF
10µF
1kΩ
0.1µF
22kΩ
SCALE FACTOR ADJUST
(V_REF = 100mV FOR AC TO RMS)
470kΩ
1N914
CA3140
5µF
+
-
100kΩ
2.2MΩ
0.47µF
47kΩ
0.22µF
10µF
1µF
10kΩ
4.3kΩ
1µF 10kΩ 1µF
0.22µF
+
9V
100pF
-
(FOR OPTIMUM BANDWIDTH)
TO DISPLAY
TO BACKPLANE
Test is used as a common-mode reference level to ensure compatibility with most op amps.
FIGURE 21. AC TO DC CONVERTER WITH ICL7106
AC IN
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FN3082.9
October 24, 2014