AD8401

–5–

REV. 0

PIN DESCRIPTIONS

Pin#

Name

Description

Positive Supply. Nominal value +5 volts. This pad requires 2 bonds for die assembly.

Analog Ground for the DAC. There is a separate analog ground for the ADC.

Voltage Output from the DAC.

4

NC

No Connect.

5

A1

Address Input that controls multiplexer. See Table I for address decode.

6

RESET (RS)

Active Low Digital Input that clears the DAC register to zero, setting the DAC to mini-

mum scale. It also asynchronously clears the INT line of the ADC.

7–12, 14, 15

DB7 to DB0

Digital I/O Lines. DB7 (7) is the Most Significant Bit (MSB), for both the ADC and

the DAC, and DB0 (15) is the Least Significant Bit (LSB).

13

DGND

Digital Ground.

16

WR

Rising Edge Triggered Write Input. Used to load data into the DAC register.

17

CS

Chip Select. Active Low Input

18

RD

Active Low Read Input. When this input is active, ADC data can be read from the

part. RD going low starts the ADC conversion.

19

ST

Falling Edge Triggered Start Input. Used for applications requiring precise sample tim-

ing. The falling edge of ST starts the conversion and sets the BUSY low. The ST is not

gated by CS.

20

BUSY

ADC Active Low, Status Output. When the ADC is performing a conversion, the

BUSY

output is low.

21

INT

Active Low Output. The Interrupt output notifies the system that the ADC has com-

pleted its conversion. INT goes high on the rising edge of CS or RD. It will also be

forced high when RESET is asserted.

22

CLK

External Clock Input Pin. Accepts a TTL or 5 V CMOS input logic levels.

23

Analog ADC Ground

27–24

Four Analog Inputs

28

A0

Address input that controls multiplexer. See Table I for address decode.

PIN CONFIGURATION

Top View

(Not to Scale)

1

2

3

7

8

9

10

11

12

4

5

6

13

14

28

27

26

22

21

20

19

18

17

25

24

23

16

15

AD8401AR

NC

A1

DB7

DB6

DB5

DB4

DB3

DB2

DGND

DB1

A0

CLK

DB0

BUSY

INT

ST

RD

CS

WR

RS

NC = NO CONNECT

DICE CHARACTERISTICS

1

2

3

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Die Size 91 X 121 mil = 11,011 sq mil

28