|
ICL7106 Datasheet, PDF (12/16 Pages) Intersil Corporation – 3 1/2 Digit, LCD/LED Display, A/D Converters | |||
|
◁ |
ICL7106, ICL7107, ICL7107S
Typical Applications (Continued)
OSC 1 40
OSC 2 39
TO PIN 1
100kâ¦
OSC 3 38
TEST 37
REF HI 36
REF LO 35
CREF 34
CREF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
100pF
SET VREF
= 100mV
0.1µF
V+
1k⦠10k⦠10kâ¦
1.2V (ICL8069)
1Mâ¦
+
0.47µF
0.01µF
IN
-
47kâ¦
0.22µF
V-
C3 24
A3 23
G3 22
GND 21
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 pre-regulator 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
CREF 34
CREF 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
100kâ¦
100pF
SET VREF
= 1V
0.1µF
25k⦠24kâ¦
0.047µF
470kâ¦
1Mâ¦
0.01µF
V+
+
IN
-
0.22µF
V-
TO DISPLAY
FIGURE 15. ICL7106 AND ICL7107: RECOMMENDED
COMPONENT VALUES FOR 2V FULL SCALE
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
CREF 34
CREF 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
100kâ¦
100pF
SET VREF
= 100mV
0.1µF
1k⦠100kâ¦
0.47µF
47kâ¦
1Mâ¦
0.01µF
+5V
6.8V
+
IN
-
0.22µF
-5V
TO DISPLAY
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
CREF 34
CREF 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
100kâ¦
100pF
SET VREF
= 100mV
+5V
1k⦠10k⦠15kâ¦
0.1µF
1.2V (ICL8069)
1Mâ¦
+
0.47µF
0.01µF
IN
-
47kâ¦
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
12
FN3082.7
|
▷ |