ICL7135 Datasheet, PDF (11/15 Pages) Intersil Corporation – 4 1/2 Digit, BCD Output, A/D Converter

ICL7135
REF
VOLTAGE
+5V
-5V
1 V-
ICL7135 ^{UR 28}
2 REF
OR 27
ANALOG
GND
100kΩ
3
ANALOG
COMMON
27Ω
4 INT OUT
0.47µF
5 AZ_IN
1µF
6 BUF OUT
100kΩ
7 RC1
1µF
8 RC2
STROBE 26
R/H 25
DIG. GND 24
POL 23
CLOCK 22
BUSY 21
100kΩ
INPUT _0.1µF
9 INPUT LO
10 INPUT HI
+5V 11 _V+
D1 20
D2 19
D3 18
12 D5
D4 17
13 B1
B8 16
14 B2
B4 15
4¹/₂ DIGIT LCD DISPLAY
28 SEGMENTS D1-D4
1 16 15 1412 5 3 4
CD4054A
7 8 13 1110 9 2 6
120kC = 3 READINGS/SEC
CLOCK IN
300pF
BACKPLANE
5BP _ICM7211A
31 D1
32 D2
33 D3
34 D4
30 B3
29 B2
28 B1
27 B0
35 V-
2,3,4
6-26
37-40
OSC 36
OPTIONAL
CAPACITOR
22-100pF ^+5V
V+ 1
0V
+5V
FIGURE 10. DRIVING LCD DISPLAYS
+5V
0.22µF
16kΩ
56kΩ
8
+
2
7
LM311
3^{- 4 1}
16kΩ
1kΩ
30kΩ
390pF
FIGURE 11. LM311 CLOCK SOURCE
+
10µF _-
+5V
1
8
2
7
ICL7660
3
6
4
5
V_OUT = -5V
-
10µF ₊
FIGURE 12. GENERATING A NEGATIVE SUPPLY FROM +5V
11
FN3093.3