ICL7126 View Datasheet(PDF) - Renesas Electronics
Part Name
Description
Manufacturer
ICL7126 Datasheet PDF : 15 Pages
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ICL7216
Typical Applications (Continued)
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
V+ 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
†
50pF
SET VREF
= 100mV
+5V
20k 100k 27k
0.1F
1.2V (ICL8069)
1M
+
0.01F
IN
0.33F
-
180k
†
TO DISPLAY
TO BACK PLANE
V+
OSC 1 40 †
OSC 2 39
OSC 3 38
TEST 37 50pF
REF HI 36
V+ 35
CREF 34
CREF 33
COMMON 32
0.1F
IN HI 31
IN LO 30
A-Z 29
BUFF 28
0.33F
RINT
INT 27
V - 26
†
G2 25
C3 24
A3 23
TO DISPLAY
G3 22
GND 21
TO BACK PLANE
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. † indicates values depend on clock frequency.
FIGURE 14. ICL7126 OPERATED FROM SINGLE +5V SUPPLY
The resistor values within the bridge are determined by the desired
sensitivity. † indicates values depend on clock frequency.
FIGURE 15. ICL7126 MEASURING RATIOMETRIC VALUES OF
QUAD LOAD CELL
OSC 1 40
OSC 2 39
†
OSC 3 38
TEST 37
REF HI 36
50pF
SCALE
FACTOR
ADJUST
V+ 35
CREF
CREF
34
33 0.1F
COMMON 32
100k 1M
200k 470k
IN HI 31
IN LO 30
A-Z 29
BUFF 28
0.01F
0.33F
ZERO
ADJUST
390k
INT 27
V - 26
†
G2 25
C3 24
A3 23
TO DISPLAY
G3 22
BP 21
TO BACKPLANE
100k
SILICON NPN
MPS 3704 OR
SIMILAR
9V
A silicon diode-connected transistor has a temperature coefficient of about -2mV/oC. Calibration is achieved by placing the sensing transistor in
ice water and adjusting the zeroing potentiometer for a 000.0 reading. The sensor should then be placed in boiling water and the scale-factor
potentiometer adjusted for a 100.0 reading.
FIGURE 16. ICL7126 USED AS A DIGITAL CENTIGRADE THERMOMETER
FN3084 Rev.5.00
Oct 25, 2004
Page 12 of 15
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