General Description

The MAX544/MAX545 are serial-input, voltage-output,

14-bit digital-to-analog converters (DACs) that operate

from a single +5V supply. They provide 14-bit perfor-

mance (±0.5LSB INL and ±0.9LSB DNL) over tempera-

ture without any adjustments. The DAC output is

unbuffered, resulting in a low supply current of 0.3mA

and a low offset error of 0.6mV.

tion, matched scaling resistors are provided in the

MAX545 for use with an external precision op amp

swing. The MAX545 also includes Kelvin-sense con-

nections for the reference and analog ground pins to

reduce layout sensitivity.

A 16-bit serial word is used to load data into the DAC

latch. The 10MHz, 3-wire serial interface is compatible

with SPI™/QSPI™/MICROWIRE™, and it also interfaces

directly with optocouplers for applications requiring isola-

tion. A power-on reset circuit clears the DAC output to 0V

(unipolar mode) when power is initially applied.

The MAX544 is available in 8-pin plastic DIP and SO

packages. The MAX545 is available in 14-pin plastic

DIP and SO packages.

Applications

Digital Offset and Gain Adjustment

Instrumentation

Industrial Process Control

Automated Test Equipment

Data-Acquisition Systems

Features

o Full 14-Bit Performance Without Adjustments

o +5V Single-Supply Operation

o Low Power: 1.5mW

o 1µs Settling Time

o Unbuffered Voltage Output Directly Drives 60kΩ

Loads

o SPI/QSPI/MICROWIRE-Compatible Serial Interface

o Power-On Reset Circuit Clears DAC Output to 0V

(unipolar mode)

o Schmitt-Trigger Inputs for Direct Optocoupler

Interface

o Pin-Compatible 16-Bit Upgrades

(MAX541/MAX542)

+5V, Serial-Input, Voltage-Output, 14-Bit DACs

________________________________________________________________ Maxim Integrated Products

1

14

13

12

11

10

9

8

1

2

3

4

5

6

7

INV

DGND

LDAC

AGNDS

AGNDF

OUT

RFB

TOP VIEW

MAX545

DIN

N.C.

SCLK

CS

REFF

REFS

DIP/SO

DIN

REF

SCLK

CS

1

2

8

7

DGND

AGND

OUT

MAX544

3

4

6

5

DIP/SO

Pin Configurations

14-BIT DAC

DATA LATCH

SERIAL INPUT REGISTER

CONTROL

LOGIC

MAX545

REFF

REFS

CS

DIN

SCLK

AGNDS

AGNDF

OUT

INV

RFB

DGND

LDAC

Functional Diagrams

19-1088; Rev 3; 12/99

PART

MAX544ACPA

MAX544BCPA

MAX544ACSA

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

8 Plastic DIP

8 Plastic DIP

8 SO

Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

MAX544BCSA

0°C to +70°C

8 SO

INL

(LSB)

±1/2

±1

±1/2

±1

Ordering Information continued at end of data sheet.

Functional Diagrams continued at end of data sheet.