HI7131CM44 INTERSIL [Intersil Corporation], HI7131CM44 Datasheet - Page 17

• 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
Values shown are for 200mV full-scale, 3 readings/sec., floating
supply voltage (9V battery).
FIGURE 100. HI7131 AND HI7133 USING THE INTERNAL
For 1 reading/sec., change C
FIGURE 102. RECOMMENDED COMPONENT VALUES FOR
COMMON
COMMON
BP/GND
BP/GND
REF LO
REF LO
REF HI
REF HI
OSC 1
OSC 2
OSC 3
REFERENCE
2.000V FULL-SCALE, 3 READINGS/SEC
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
IN LO
BUFF
C
C
TEST
IN HI
C
C
IN HI
REF
REF
A-Z
INT
REF
REF
A-Z
INT
V -
G2
C3
A3
G3
V -
G2
C3
A3
G3
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
TO DISPLAY
TO DISPLAY
INT
0.047 F
0.047 F
0.47 F
0.47 F
180k
180k
50pF
50pF
, R
0.1 F
0.1 F
1.8M
OSC
180k
TO BACKPLANE 0V
TO BACKPLANE 0V
TO PIN 1
TO PIN 1
to values of Figure 12.
250k
20k
0.01 F
0.01 F
SET V
= 1V
SET V
= 100mV
240k
1M
220k
1M
REF
REF
HI7131, HI7133
+
-
+
-
V +
IN
V -
9V
IN
3-1842
IN LO is tied to supply GND establishing the correct common-mode
voltage. COMMON acts as a pre-regulator for the reference. Values
shown are for 1 reading/sec.
FIGURE 101. HI7131 AND HI7133 WITH AN EXTERNAL
An external reference must be used in this application, since the
voltage between V+ and V- is insufficient for correct operation of the
internal reference. COMMON holds the IN LO almost at the middle
of the supply,
FIGURE 103. HI7131 AND HI7133 OPERATED FROM SINGLE
COMMON
COMMON
BP/GND
REF LO
BP/GND
REF LO
REF HI
OSC 1
OSC 2
OSC 3
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN LO
BUFF
IN HI
TEST
C
C
IN HI
REF
REF
A-Z
BAND-GAP REFERENCE (1.2V TYPE)
+5V SUPPLY
INT
REF
REF
A-Z
G2
G3
INT
V -
C3
A3
G2
G3
V -
C3
A3
2.7V.
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
TO DISPLAY
TO DISPLAY
0.47 F
0.47 F
0.15 F
0.047 F
560k
180k
50pF
50pF
0.1 F
0.1 F
180k
180k
TO BACKPLANE 0V
TO BACKPLANE 0V
TO PIN 1
TO PIN 1
20k
20k
0.01 F
0.01 F
SET V
= 100mV
180k
SET V
= 100mV
180k
1M
1.2V (ICL8069)
1M
1.2V (ICL8069)
REF
REF
27k
27k
+
-
+
IN
IN
V
-
+5V
V +