SP8480AS datasheet(4/12 Pages) SIPEX

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PIN FUNCTION…

0 — Device Address — Logic low enables 8

MSB read; logic high enables 4 LSB read

STATUS — Identifies valid data output; goes to

logic high during conversion; goes to logic low

when conversion is completed and data is valid

R/C — Read/Convert — Initiates conversion on

the high-to-low transition; logic low disconnects

data bus; logic high initiates read

CE — Chip Enable — Logic low disables read

or convert; logic high enables read or convert

0, MA1, MA2 — MUX Address 0, 1 & 2 —

Selects analog input channels CH

0 through CH7

0 through DB11 — Data Outputs — Logic

high is binary true; logic low binary false

234567

9 10 11 12 13 14

23 22 21 20 19 18

28 27 26 25

12-BIT ADC

8-CHANNEL

MULTIPLEXER

DECODE

REF

MULTIPLEXER TRUTH TABLE

OPERATION

O Selected

1 Selected

2 Selected

3 Selected

4 Selected

5 Selected

6 Selected

7 Selected

CONTROL TRUTH TABLE

R/C

OPERATION

H ->L

Start Conversion

Enable 8 MSBs

Enable 4 LSBs

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