Intel 8253 - Page 705

Philips Semiconductors Linear Products Product specification
ADC0803/4-1CMOS 8-bit A/D converters
August 31, 1994
565
CLK IN
A GND
V
REF
/2
V
IN
(–)
A/D
+5V
10K
2.7k
10k
47µF TO
100µF
56pF
10k
CS
1
2
3
4
5
6
7
8
9
10
RD
INTR
WR
V
IN
(+)
D GND
20
CLK R
18
17
16
15
14
13
12
11
V
CC
D0
DB0
D1
D2
D3
D4
D5
D6
D7
DB1
DB2
DB3
DB4
DB5
DB6
DB7
+5V
19
Figure 5. Connection for Continuous Conversion
R
CLK IN 4
C
CLK
A/D
f
CLK
= 1/1.7 R C
R = 10K
CLK R
19
Figure 6. Self-Clocking the Converter
D GND
V
REF
/2
CLK IN
A GND
V
IN
(–)
A/D
10k
CS
1
2
3
4
5
6
7
8
9
10
RD
INTR
WR
V
IN
(+)
20
CLK R
18
17
16
15
14
13
12
11
V
CC
D0
DB0
D1
D2
D3
D4
D5
D6
D7
DB1
DB2
DB3
DB4
DB5
DB6
DB7
+5V
19
ADDRESS
DECODE
LOGIC
INT
I/O WR
I/O RD
ANALOG
INPUTS
56pF
Figure 7. Interfacing to 8080A Microprocessor
20
V
CC
D GND
V
REF
/2
A GND
A/D
CS
1
2
3
4
5
6
7
8
17 RD
INTO
WR
V
IN
(+)
V
CC
D0
D1
D2
D3
D4
D5
D6
D7
+5V
40
16
12
39
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P0.0
SCN8051
OR
SCN80C51
18
17
16
15
14
13
12
11
2
3
5
1
RD
INTR
WR
19 CLK R
10k
4 CLK IN
6
7
ANALOG
INPUTS
12
11
Figure 8. SCN8051 Interfacing
56pF
18
17
16
15
14
13
12
11
D0
D1
D2
D3
D4
D5
D6
D7
A/D
OE
DATA
BUS
8–BIT
BUFFER
N74LS241
N74LS244
N74LS541
Figure 9. Buffering the A/D Output to Drive High
Capacitance Loads and for Driving Off-Board Loads