HI7131CM44 INTERSIL [Intersil Corporation], HI7131CM44 Datasheet - Page 20

• Manufacturer Part Number: HI7131CM44
• Description: 3 1/2 Digit, Low Power, High CMRR, LCD/LED Display-Type A/D Converters
• Manufacturer: INTERSIL [Intersil Corporation]

Typical Applications
COMMON
BP/GND
REF LO
FIGURE 107. CIRCUIT FOR DEVELOPING UNDERRANGE AND OVERRANGE SIGNALS FROM HI7131 OUTPUTS
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
REF
REF
A-Z
INT
G2
G3
V -
C3
A3
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
Test is used as a common-mode reference level to ensure compatibility with most op amps.
U /RANGE
TO DISPLAY
O /RANGE
TO PIN 1
0.047 F
0.47 F
180k
50pF
0.1 F
180k
CD4023 OR
(Continued)
TO BACKPLANE 0V
FIGURE 106. AC TO DC CONVERTER WITH HI7131 AND HI7133
74C10
20k
10 F
220k
10 F
HI7131, HI7133
TO LOGIC
9V
V
V+
CC
CD4077
SCALE FACTOR ADJUST
(V
(FOR OPTIMUM BANDWIDTH)
3-1845
REF
1 F
= 100mV FOR AC TO RMS)
4.3k
470k
10
11
12
13
14
15
16
17
18
19
20
100pF
1
2
3
4
5
6
7
8
9
V3
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
10k
COMMON
REF LO
REF HI
OSC 1
OSC 2
OSC 3
1 F
IN LO
BUFF
TEST
C
C
IN HI
REF
REF
A-Z
INT
G2
G3
BP
C3
A3
1N914
V
-
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
10k
TO LOGIC
0.22 F
5 F
1 F
GND
V-
ICL7611
2.2M
+
-
100k
AC IN