ADC0804 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

View to exact match

ADC0804

8-Bit, Microprocessor-Compatible, A/D Converters

Renesas Electronics 

ADC0803, ADC0804

Typical Performance Curves (Continued)

7

6

V+ = 4.5V

5

4

3

2

V+ = 5V

1

0

V+ = 6V

0

400

800

1200

1600

2000

fCLK (kHz)

FIGURE 6. FULL SCALE ERROR vs fCLK

16

VIN(+) = VIN(-) = 0V

14

ASSUMES VOS = 2mV

THIS SHOWS THE NEED

12

FOR A ZERO ADJUSTMENT

IF THE SPAN IS REDUCED

10

8

6

4

2

0

0.01

0.1

1.0

5

VREF/2 (V)

FIGURE 7. EFFECT OF UNADJUSTED OFFSET ERROR

8

V+ = 5V

7

DATA OUTPUT

BUFFERS

6

5

ISOURCE

VOUT = 2.4V

4

3

-ISINK

VOUT = 0.4V

2

-50 -25

0

25

50

75 100 125

TA AMBIENT TEMPERATURE (oC)

FIGURE 8. OUTPUT CURRENT vs TEMPERATURE

Timing Diagrams

1.6

fCLK = 640kHz

1.5

V+ = 5.5V

1.4

1.3

V+ = 5.0V

1.2

1.1

V+ = 4.5V

1.0

-50 -25

0

25

50

75

100

125

TA AMBIENT TEMPERATURE (oC)

FIGURE 9. POWER SUPPLY CURRENT vs TEMPERATURE

CS

WR

ACTUAL INTERNAL

STATUS OF THE

CONVERTER

tWI

tW(WR)I

(LAST DATA READ)

INTR

(LAST DATA NOT READ)

“BUSY”

“NOT BUSY”

1 TO 8 x 1/fCLK

INTERNAL TC

tVI

FIGURE 10A. START CONVERSION

DATA IS VALID IN

OUTPUT LATCHES

INTR

ASSERTED

1/2 fCLK

FN3094 Rev 4.00

August 2002

Page 6 of 17

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