AD7880

–4–

REV. 0

PIN FUNCTION DESCRIPTION

Pin

Pin

No.

Mnemonic Function

Analog Input.

Analog Input.

3

AGND

Analog Ground.

5

CS

Chip Select. Active Low Logic input. The device is selected when this input is active.

6

CONVST

Convert Start. A low to high transition on this input puts the track/hold into hold mode and starts con-

version. This input is asynchronous to the CLKIN and is independent of CS and RD.

7

RD

Read. Active Low Logic Input. This input is used in conjunction with CS low to enable data outputs.

8

BUSY

Active Low Logic Output. This status line indicates converter status. BUSY is low during conversion.

9

CLKIN

Clock Input. TTL-compatible logic input. Used as the clock source for the A/D converter. The mark/

space ratio of the clock can vary from 40/60 to 60/40.

10

DGND

Digital Ground.

11 . . . 22

DB0–DB11 Three-State Data Outputs. These become active when CS and RD are brought low.

23

MODE

MODE Input. This input is used to put the device into the power save mode (MODE = 0 V). During

24

Power Supply. This is nominally +5 V.

ORDERING GUIDE

Bipolar

Full-Scale

Zero

Temperature

Error

Error

Package

Model

Range

(LSBs)

(LSBs)

Option*

AD7880BN

–40

°C to +85°C ±15

±10

N-24

AD7880BQ

–40

°C to +85°C ±15

±10

Q-24

AD7880CN

–40

°C to +85°C ± 5

± 5

N-24

AD7880CQ

–40

°C to +85°C ± 5

± 5

Q-24

AD7880BR

–40

°C to +85°C ±15

±10

R-24

AD7880CR

–40

°C to +85°C ± 5

± 5

R-24

*N = Plastic DIP; Q = Cerdip; R = SOIC (Small Outline Integrated Circuit).

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

24

23

22

21

20

19

18

17

16

15

AD7880

AGND

CLKIN

DGND

DB0

DB1

DB2

DB3

DB4

DB5

DB6

DB8

DB7

DB9

DB10

DB11

MODE

CS

CONVST

RD

BUSY