304

PIN ASSIGNMENTS…

(Refer to Page 11 for package configurations and dimensions)

116

234567

8

9 10 11 12 13 14 15

17

23 22 21 20 19 18

24

30 29 28 27 26 25

32 31

CONTROL

LOGIC

12-BIT ADC

8-CHANNEL

MULTIPLEXER

DECODE

REF

Table 1. Multiplexer Truth Table

MULTIPLEXER TRUTH TABLE

LATCH

MAEN MA

2

MA

1

MA

0

OPERATION

H -> L

0

0

0

0

CH

H -> L

0

0

0

1

CH

H -> L

0

0

1

0

CH

H -> L

0

0

1

1

CH

H -> L

0

1

0

0

CH

H -> L

0

1

0

1

CH

H -> L

0

1

1

0

CH

H -> L

0

1

1

1

CH

H -> L

1

n

n

n

All Deselected

0

X

X

X

X

Prev. Ch. n Held

1

X

X

X

X

Prev. Ch. n Held

PIN FUNCTION…

R/C — Read/Convert — Initiates conversion on

the Hi-to-low transition; logic low disconnects

data bus; logic high initiates read

CS — Chip Select — Logic high disconnects

data bus; logic low allows conversion or reading

of data

CE — Chip Enable — Logic low disables read or

convert; logic high enables read or convert

A

MSB read; logic high enables 4 LSB read

MA

Selects analog input channels CH

LATCH — MUX Address Latch — Logic high

to low transition captures MUX address on MUX

address lines

MAEN — MUX Enable — Logic low allows

normal MUX address; logic high deselects CH

O

through CH

7

DB

high is binary true; logic low binary false

Table 2. Control Truth Table

CONTROL TRUTH TABLE

CE

CS

A

O

R/C

OPERATION

0

X

X

X

None

X

1

X

X

None

L->H

0

0

X

Start Conversion

1

H ->L

0

X

Start Conversion

1

0

H ->L

X

Start Conversion

1010

Enable 8 MSBs

1011

Enable 4 LSBs