ICL7106_14 Datasheet, PDF (12/17 Pages) Intersil Corporation – 31/2 Digit, LCD/LED Display, A/D Converters

ICL7106, ICL7107, ICL7107S
Typical Applications (Continued)
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 PIN 1
100kΩ
100pF
SET V_REF
= 100mV
0.1µF
V+
1kΩ 10kΩ 10kΩ
1.2V (ICL8069)
1MΩ
+
0.47µF
0.01µF
IN
-
47kΩ
0.22µF
V^-
TO DISPLAY
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 PIN 1
100kΩ
100pF
SET V_REF
= 100mV
0.1µF
1kΩ 100kΩ
0.47µF
47kΩ
1MΩ
0.01µF
+5V
6.8V
+
IN
-
0.22µF
-5V
TO DISPLAY
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 preregulator is overridden.
FIGURE 13. ICL7107 WITH AN EXTERNAL BAND-GAP
REFERENCE (1.2V TYPE)
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 PIN 1
100kΩ
100pF
SET V_REF
= 1V
0.1µF
25kΩ 24kΩ
0.047µF
470kΩ
1MΩ
0.01µF
V+
+
IN
-
0.22µF
V-
TO DISPLAY
FIGURE 15. ICL7106 AND ICL7107: RECOMMENDED COMPONENT
VALUES FOR 2V FULL SCALE
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
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 PIN 1
100kΩ
100pF
SET V_REF
= 100mV
0.1µF
+5V
1kΩ 10kΩ 15kΩ
1.2V (ICL8069)
1MΩ
+
0.47µF
0.01µF
IN
-
47kΩ
0.22µF
TO DISPLAY
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 16. ICL7107 OPERATED FROM SINGLE +5V
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FN3082.9
October 24, 2014