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ADC0803CD

CMOS 8-bit A/D converters

Philips Electronics 

Philips Semiconductors

CMOS 8-bit A/D converters

Product data

ADC0803/0804

R

VREF/2 9

R

VCC

20 VREF

DIGITAL

CIRCUITS

ANALOG

CIRCUITS

(5V)

VREF

–

FS

OFFSET

+

ADJUST

ZS

OFFSET

ADJUST

330 Ω

TO VREF/2

0.1 µF

TO VIN(–)

8

10

NOTE:

The VREF/2 voltage is either 1/2 the VCC voltage or is that which is forced at Pin 9.

SL00021

Figure 6. Internal Reference Design

SL00022

Figure 7. Offsetting the Zero Scale and Adjusting the Input

Range (Span)

VIN(+)

VIN(–)

+5V

VCC

+

10 µF

A/D

VREF/2

VOLTAGE

REFERENCE

VREF/2

VIN(+)

VIN(–)

+5V

VCC

+

10 µF

A/D

VREF/2

2 kΩ

2 kΩ

a. Fixed Reference

b. Fixed Reference Derived from VCC

Figure 8. Absolute Mode of Operation

+5V

2 kΩ

100 Ω

2 kΩ

c. Optional Full

Scale Adjustment

SL00023

2002 Oct 17

11

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