AD779

–6–

REV. B

PIN DESCRIPTION

28-Pin DIP

Symbol

Pin No.

Type

Name and Function

AGND

7

P

Analog Ground. This is the ground return for AIN only.

AIN

6

AI

Analog Signal Input.

BIPOFF

10

AI

Bipolar Offset. Connect to AGND for +10 V input unipolar mode and straight

±5 V input

bipolar mode and twos-complement binary output coding.

CS

12

DI

Chip Select. Active LOW.

DGND

14

P

Digital Ground.

DB13–DB0

28–15

DO

Data Bits. These pins provide all 14 bits in one 14 bit parallel output.

Active HIGH.

EOC

2

DO

End-of-Convert. EOC goes LOW when a conversion starts and goes HIGH

when the conversion is finished. EOC is a three-state output. See

EOCEN

pin for information on EOC gating.

EOCEN

13

DI

End-of-Convert Enable. Enables EOC pin. Active LOW.

OE

3

DI

Output Enable. A down-going transition on OE enables data bits.

Active LOW.

9

AI

Reference Input. +5 V input gives 10 V full scale range.

8

AO

SC

4

DI

Start Convert. Active LOW.

11

P

+12 V Analog Power.

5

P

–12 V Analog Power.

1

P

+5 V Digital Power.

Type: AI = Analog Input.

AO = Analog Output.

DI = Digital Input.

DO = Digital Output. All DO pins are three-state drivers.

P = Power.

PIN CONFIGURATION

DIP Package