Philips Semiconductors
Product data
CMOS 8-bit A/D converters
ADC0803/0804
V
CC
V
(+)
V
CC
IN
+
TRANSDUCER
10µF
2 kΩ
A/D
FULL SCALE
OPTIONAL
100 Ω
V
/2
REF
V
(–)
IN
2 kΩ
SL00024
Figure 9. Ratiometric Mode of Operation with Optional Full
Scale Adjustment
10k
+5 V
+5 V
V
CC
20
CS
RD
1
2
19 CLK R
18 D0
WR
3
DB0
10 kΩ
17 D1
16 D2
2.7 kΩ
CLK IN
INTR
4
5
DB1
DB2
A/D
6
7
8
15 D3
14 D4
V
(+)
IN
DB3
DB4
10 kΩ
47 µF TO
100 µF
V
(–)
IN
56 pF
13 D5
12 D6
11 D7
A GND
/2
DB5
DB6
DB7
V
9
REF
D GND 10
SL00025
Figure 10. Connection for Continuous Conversion
INT
CLK R
R
19
I/O WR
I/O RD
CLK IN 4
+5 V
10 kΩ
CLK
f
= 1/1.7 R C
C
CLK
R = 10 kΩ
V
20
CS
1
2
CC
A/D
RD
19 CLK R
18 D0
SL00026
WR
3
DB0
17 D1
16 D2
CLK IN
INTR
4
5
Figure 11. Self-Clocking the Converter
DB1
DB2
A/D
15 D3
6
7
8
V
(+)
IN
DB3
DB4
ANALOG
INPUTS
14 D4
13 D5
12 D6
V
(–)
IN
A GND
DB5
DB6
DB7
56 pF
V
/2
9
REF
D GND 10
11 D7
ADDRESS
DECODE
LOGIC
SL00027
Figure 12. Interfacing to 8080A Microprocessor
12
2002 Oct 17
NXP [ NXP ]
