ICL7126_14 Datasheet, PDF (13/15 Pages) Intersil Corporation – 3 1/2 Digit, Low Power, Single Chip A/D Converter

Typical Applications (Continued)
O /RANGE
U /RANGE
ICL7126
V+
TO LOGIC
V_CC
1 V+
2 D1
3 C1
4 B1
5 A1
6 F1
7 G1
8 E1
9 D2
10 C2
11 B2
12 A2
13 F2
14 E2
15 D3
16 B3
17 F3
18 E3
19 AB4
20 POL
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35 _TO
C_REF
34
LOGIC
GND
C_REF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26 V-
G2 25
C3 24
A3 23
G3 22
BP 21
CD4023 OR
74C10
CD4077
FIGURE 17. CIRCUIT FOR DEVELOPING UNDERRANGE AND OVERRANGE SIGNAL FROM ICL7126 OUTPUTS
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
TO PIN 1
180kΩ
50pF
10µF
REF HI 36
REF LO 35
C_REF 34
C_REF 33
COMMON 32
0.1µF
10kΩ
220kΩ
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
0.22µF
750Ω
180kΩ
0.047µF
10µF
SCALE FACTOR ADJUST
(V_REF = 100mV FOR AC TO RMS)
470kΩ
1N914
ICL7611
5µF
+
-
100kΩ
2.2MΩ
1µF
10kΩ
4.3kΩ
1µF 10kΩ 1µF
0.22µF
9V
100pF
(FOR OPTIMUM
BANDWIDTH)
G2 25
C3 24
A3 23
TO DISPLAY
G3 22
BP 21
TO BACKPLANE
Test is used as a common-mode reference level to ensure compatibility with most op amps.
AC IN
FIGURE 18. AC TO DC CONVERTER WITH ICL7126
13
FN3084.5