ICL7106, ICL7107, ICL7107S
Typical Applications
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
GND 21
TO DISPLAY
0.22µF
V
-
0.01µF
0.47µF
47kΩ
IN
1kΩ
0.1µF
1.2V (ICL8069)
1MΩ
+
10kΩ
10kΩ
V+
100pF
SET V
REF
= 100mV
(Continued)
TO PIN 1
TO PIN 1
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
GND 21
TO DISPLAY
0.22µF
-5V
0.01µF
0.47µF
47kΩ
IN
1kΩ
0.1µF
1MΩ
100kΩ
6.8V
+
+5V
100pF
SET V
REF
= 100mV
100kΩ
100kΩ
-
-
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)
TO PIN 1
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/GND 21
TO DISPLAY
0.22µF
V-
0.01µF
0.047µF
470kΩ
IN
25kΩ
0.1µF
1MΩ
+
24kΩ
V+
100pF
SET V
REF
= 1V
100kΩ
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.
FIGURE 14. ICL7107 WITH ZENER DIODE REFERENCE
TO PIN 1
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
GND 21
TO DISPLAY
0.22µF
0.01µF
0.47µF
47kΩ
1kΩ
0.1µF
1.2V (ICL8069)
1MΩ
+
IN
10kΩ
15kΩ
+5V
100pF
SET V
REF
= 100mV
100kΩ
-
-
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
COMPONENT VALUES FOR 2V FULL SCALE
FIGURE 16. ICL7107 OPERATED FROM SINGLE +5V
12
FN3082.8
INTERSIL [ INTERSIL CORPORATION ]
