ICL7106, ICL7107, ICL7107S
Typical Applications (Continued)
TO PIN 1
TO PIN 1
OSC 1 40
OSC 1 40
100kΩ
100kΩ
OSC 2 39
OSC 3 38
OSC 2 39
OSC 3 38
TEST 37
SET V
SET V
REF
= 100mV
REF
= 100mV
100pF
0.1µF
100pF
TEST 37
REF HI 36
REF LO 35
REF HI 36
REF LO 35
+5V
V +
1kΩ 10kΩ
10kΩ
1kΩ 100kΩ
C
C
34
33
C
C
34
33
REF
REF
REF
REF
6.8V
0.1µF
1.2V (ICL8069)
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
1MΩ
1MΩ
+
+
IN
0.01µF
IN
0.01µF
0.47µF
0.47µF
-
-
47kΩ
47kΩ
0.22µF
0.22µF
-
V - 26
V
-5V
V - 26
G2 25
G2 25
C3 24
C3 24
TO DISPLAY
TO DISPLAY
A3 23
A3 23
G3 22
G3 22
GND 21
GND 21
Since low TC zeners have breakdown voltages ~ 6.8V, diode must
be placed across the total supply (10V). As in the case of Figure 12,
IN LO may be tied to either COMMON or GND.
IN LO is tied to supply COMMON establishing the correct common mode
voltage. If COMMON is not shorted to GND, the input voltage may float
with respect to the power supply and COMMON acts as a pre-regulator
for the reference. If COMMON is shorted to GND, the input is single
ended (referred to supply GND) and the pre-regulator is overridden.
FIGURE 13. ICL7107 WITH AN EXTERNAL BAND-GAP
REFERENCE (1.2V TYPE)
FIGURE 14. ICL7107 WITH ZENER DIODE REFERENCE
TO PIN 1
TO PIN 1
OSC 1 40
OSC 1 40
100kΩ
100kΩ
OSC 2 39
OSC 2 39
OSC 3 38
SET V
OSC 3 38
SET V
REF
REF
100pF
100pF
TEST 37
REF HI 36
REF LO 35
= 100mV
TEST 37
REF HI 36
REF LO 35
= 1V
+5V
V+
1kΩ 10kΩ
15kΩ
25kΩ 24kΩ
C
C
34
33
REF
REF
C
C
34
33
REF
REF
0.1µF
0.1µF
1.2V (ICL8069)
COMMON 32
IN HI 31
IN LO 30
A-Z 29
1MΩ
COMMON 32
IN HI 31
IN LO 30
A-Z 29
+
1MΩ
+
IN
0.01µF
IN
V-
0.01µF
0.47µF
47kΩ
-
0.047µF
-
470kΩ
BUFF 28
INT 27
BUFF 28
INT 27
0.22µF
V - 26
0.22µF
V - 26
G2 25
G2 25
C3 24
TO DISPLAY
C3 24
A3 23
TO DISPLAY
A3 23
G3 22
G3 22
GND 21
BP/GND 21
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.
FIGURE 15. ICL7106 AND ICL7107: RECOMMENDED
FIGURE 16. ICL7107 OPERATED FROM SINGLE +5V
COMPONENT VALUES FOR 2V FULL SCALE
FN3082.7
12
INTERSIL [ Intersil ]
