DS4402N datasheet(4/8 Pages) DALLAS

4 / 8 page

Two/Four-Channel, I2C Adjustable Current DAC

______________________________________________________________________

VCC

RFS0

RFS1

RFS2

RFS3

SDA SCL

GND

FS0

FS1

OUT1

OUT0

CURRENT

DAC0

F8h

F9h

SOURCE OR

SINK MODE

FS2

OUT2

FS3

OUT3

CURRENT

DAC3

31-POSITIONS

EACH FOR SINK

AND SOURCE

MODE

FAh

FBh

DS4402/DS4404

DS4404

CURRENT

DAC1

CURRENT

DAC2

I2C-COMPATIBLE

SERIAL INTERFACE

Figure 1. Functional Diagram

Pin Description

DS4404

DS4402

NAME

FUNCTION

SDA

I2C Serial Data. Input/output for I2C data.

SCL

I2C Serial Clock. Input for I2C clock.

GND

Ground

—

FS3

—

FS2

FS1

FS0

Full-Scale Calibration Input. A resistor to ground on these pins determines the full-scale

current for each output. FS0 controls OUT0, FS1 controls OUT1, etc. (DS4402 has only

two inputs: FS0 and FS1.)

OUT0

OUT1

—

OUT2

—

OUT3

Current Output. Sinks or sources the current determined by the I2C interface and the

resistance connected to FSx. (DS4402 has only two outputs: OUT0 and OUT1.)

9, 11

A0, A1

Address Select Inputs. Tri-level inputs (VCC, GND, N.C.) determine the I2C slave address.

See the Detailed Description section for the nine available device addresses.

VCC

Power Supply

—

4, 5, 12, 14

N.C.

No Connection

——

Exposed Pad. Leave floating or connect to GND.

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