ICL7109
Typical Integrator Amplifier Output Waveform (INT Pin)
AUTO ZERO PHASE
(COUNTS)
INTEGRATE
PHASE FIXED
2048 COUNTS
DE-INTEGRATE PHASE
0 - 4095 COUNTS
6143 - 2048
TOTAL CONVERSION TIME = 8192 x t
(IN FREE-RUN MODE)
CLOCK
+5V
1
2
3
4
V+
XTAL 40
+5V
GND
1
GND
BUF OSC
OUT
V+ 40
REF IN - 39
REF CAP- 38
REF CAP+ 37
REF IN+ 36
IN HI 35
1000pF
OSC CONTROL XTAL 17
-
25
2
GND
+5V
GND
RRD
EPE 39
CLS1 38
CLS2 37
SBS 36
PI 35
GND
+5V
STATUS
EXTERNAL
REFERENCE
1µF
+
1MΩ
0.01µF
5 - 12
RBR 1 - 8
+
19 HBEN
3 - 8
INPUT
GND
-
IN LO 34
13 PE
14 FE
15 OE
16 SFD
CLR 34
+5V
GND
COMMON 33
INT 32
C
INT
6
/
/
B9 - B12, POL,OR
C
0.15µF
AZ
26 - 33
31
8
/
8
9 - 16
AZ 31
TBR 1 - 8
B1 - B8
0.33µF
BUF 30
R
20kΩ 0.2V REF
200kΩ 2V REF
INT
TRE 24
DRR 18
+5V
17 TEST
REF OUT 29
V- 28
+5V
-5V
18 LBEN
20 RRI
DR 19
+5V OR OPEN
GND
21 MODE
RUN/HOLD 26
SERIAL
INPUT
TBRL 23
TBRE 22
20 CE/LOAD OSC SEL 24
27 SEND
OSC OUT 23
OSC IN 22
3.58MHz
CRYSTAL
25 TRO
MR 21
GND
SERIAL
OUTPUT
IM6403
CMOS UART
ICL7109
CMOS A/D CONVERTER
FOR LOWEST POWER CONSUMPTION
TBR1 - TBR8 INPUTS SHOULD HAVE 100kΩ
PULLUP RESISTORS TO +5V
FIGURE 1A. TYPICAL CONNECTION DIAGRAM UART INTERFACE-TO TRANSMIT LATEST RESULT, SEND ANY WORD TO UART
7
INTERSIL [ Intersil ]
