Philips Semiconductors

Product data

ADC0803/0804

CMOS 8-bit A/D converters

2002 Oct 17

12

A/D

+

10

µF

2 k

Ω

2 k

Ω

100

Ω

FULL SCALE

OPTIONAL

TRANSDUCER

SL00024

Figure 9. Ratiometric Mode of Operation with Optional Full

Scale Adjustment

CLK IN

A GND

A/D

+5 V

10 k

Ω

2.7 k

Ω

47

µF TO

100

µF

56 pF

10k

CS

1

2

3

4

5

6

7

8

9

10

RD

INTR

WR

D GND

20

CLK R

18

17

16

15

14

13

12

11

D0

DB0

D1

D2

D3

D4

D5

D6

D7

DB1

DB2

DB3

DB4

DB5

DB6

DB7

+5 V

19

SL00025

10 k

Ω

Figure 10. Connection for Continuous Conversion

R

CLK IN 4

C

CLK

A/D

fCLK = 1/1.7 R C

R = 10 k

Ω

CLK R 19

SL00026

Figure 11. Self-Clocking the Converter

D GND

VREF/2

CLK IN

A GND

VIN(–)

A/D

10 k

Ω

CS

1

2

3

4

5

6

7

8

9

10

RD

INTR

WR

VIN(+)

20

CLK R

18

17

16

15

14

13

12

11

VCC

D0

DB0

D1

D2

D3

D4

D5

D6

D7

DB1

DB2

DB3

DB4

DB5

DB6

DB7

+5 V

19

ADDRESS

DECODE

LOGIC

INT

I/O WR

I/O RD

ANALOG

INPUTS

56 pF

SL00027

Figure 12. Interfacing to 8080A Microprocessor