+3V, 400ksps, 4/8-Channel,

8-Bit ADCs with 1µA Power-Down

6

_______________________________________________________________________________________

______________________________________________________________Pin Description

Mode Selection Input. Internally pulled low with a 15µA current source. MODE = 0

activates read mode; MODE = 1 activates write-read mode (see

Digital Interface

section).

MODE

5

Analog Input Channel 6

IN6

—

FUNCTION

Three-State Data Outputs

D1, D2, D3

7, 8, 9

Three-State Data Output (LSB)

D0

6

Lower limit of reference span. REF- sets the zero-code voltage. Range is GND

≤

REF-

13

Ground

GND

12

Interrupt Output.

INT goes low to indicate end of conversion (see Digital Interface

section).

INT

11

Read Input.

RD must be low to access data (see Digital Interface section).

RD

10

Write-Control Input/Ready-Status Output (see

Digital Interface section)

WR/RDY

15

Upper limit of reference span. REF+ sets the full-scale input voltage. Range is

REF+

14

Multiplexer Channel Address Input (MSB)

A2

—

Three-State Data Output (MSB)

D7

20

Positive Supply, +3.0V to +3.6V

24

Power-Down Input.

PWRDN reduces supply current when low.

PWRDN

23

Multiplexer Channel Address Input (LSB)

A0

22

Multiplexer Channel Address Input

A1

21

Analog Input Channel 7

IN7

—

Three-State Data Outputs

D4, D5, D6

17, 18, 19

Chip-Select Input.

CS must be low for the device to recognize WR or RD inputs.

CS

16

9, 10, 11

8

15

14

13

12

17

16

23

22

27

PIN

7

1

26

25

24

28

19, 20, 21

18

MAX113

NAME

MAX117

Analog Input Channel 5

IN5

—

2

Analog Input Channel 1

Analog Input Channel 2

IN2

3

IN1

5

4

6

Analog Input Channel 3

Analog Input Channel 4

IN4

1

IN3

3

2

4