CMOS High-Speed 8-Bit ADCs with

Multiplexer and Reference

_______________________________________________________________________________________

5

Reference Output (2.5V) for MAX154

REF OUT

5

Three-State Data Output, bit 0 (LSB)

DBO

6

Three-State Data Output, bit 1

DB1

7

Analog Input Channel 1

AIN1

4

Analog Input Channel 2

AIN2

3

Analog Input Channel 3

AIN3

2

Analog Input Channel 4

AIN4

1

_____________________________________________________________Pin Descriptions

Three-State Data Output, bit 2

DB2

8

Three-State Data Output, bit 3

DB3

9

Read Input. RD controls conversions and

data access. See

Digital Interface section.

RD

10

Three-State Data Output, bit 7 (MSB)

DB7

20

Ground

GND

12

Lower Limit of Reference Span. Sets

the zero-code voltage.

13

Interrupt Output. INT going low indi-

cates the completion of a conversion.

See

Digital Interface section.

INT

11

Chip-Select Input. CS must be low for

the device to be selected.

CS

16

Three-State Data Output, bit 4

DB4

17

Three-State Data Output, bit 5

DB5

18

Three-State Data Output, bit 6

DB6

19

Interrupt Output. INT going low indi-

cates the completion of a conversion.

See

Digital Interface section.

INT

13

Ground

GND

14

Analog Input Channel 2

AIN2

5

Analog Input Channel 1

AIN1

6

Reference Output (2.5V) for MAX158

REF OUT

7

Analog Input Channel 3

AIN3

4

Analog Input Channel 4

AIN4

3

Analog Input Channel 5

AIN5

2

Analog Input Channel 6

AIN6

1

Three-State Data Output, bit 0 (LSB)

DB0

8

Three-State Data Output, bit 1

DB1

9

Three-State Data Output, bit 2

DB2

10

Three-State Data Output, bit 3

DB3

11

Lower Limit of Reference Span. Sets

the zero-code voltage.

15

Read Input. RD controls conversions

and data access.

See

Digital Interface section.

RD

12

Ready Output. Open-drain output with

no active pull-up device. Goes low

when CS goes low and high imped-

ance at the end of a conversion.

RDY

17

Power-Supply Voltage, +5V

26

Channel Address 2 Input

A2

23

Channel Address 1 Input

A1

24

Channel Address 0 Input

A0

25

Upper Limit of Reference Span. Sets

the full-scale input voltage.

14

Ready Output. Open-drain output with

no active pull-up device. Goes low

when CS goes low and high imped-

ance at the end of a conversion.

RDY

15

Power-Supply Voltage, +5V

24

Channel Address 1 Input

A1

21

Channel Address 0 Input

A0

22

No Connect

NC

23

Three-State Data Output, bit 7 (MSB)

DB7

22

Chip-Select input.

–

CS must be low for

the device to be selected.

CS

18

Three-State Data Output, bit 4

DB4

19

Three-State Data Output, bit 5

DB5

20

Three-State Data Output, bit 6

DB6

21

Analog Input Channel 8

AIN8

27

Analog Input Channel 7

AIN7

28

Upper Limit of Reference Span. Sets

the full-scale input voltage.

16

PIN

MAX154

FUNCTION

NAME

PIN

MAX158

FUNCTION

NAME