_______________General Description

The MAX533 serial-input, voltage-output, 8-bit quad

digital-to-analog converter (DAC) operates from a sin-

gle +2.7V to +3.6V supply. Internal precision buffers

swing rail to rail, and the reference input range includes

both ground and the positive rail. The MAX533 features

a 1µA shutdown mode.

The serial interface is double buffered: a 12-bit input

shift register is followed by four 8-bit buffer registers

and four 8-bit DAC registers. The 12-bit serial word

consists of eight data bits and four control bits (for DAC

selection and special programming commands). Both

the input and DAC registers can be updated indepen-

dently or simultaneously with a single software com-

mand. Two additional asynchronous control pins,

LDAC

and

CLR, provide simultaneous updating or clearing of

the input and DAC registers.

The interface is compatible with SPI™, QSPI™ (CPOL =

CPHA = 0 or CPOL = CPHA = 1), and Microwire™. A

buffered data output allows daisy chaining of serial

devices.

In addition to 16-pin DIP and CERDIP packages, the

MAX533 is available in a 16-pin QSOP that occupies

the same area as an 8-pin SO.

________________________Applications

Digital Gain and Offset Adjustments

Programmable Attenuators

Programmable Current Sources

Portable Instruments

____________________________Features

o +2.7V to +3.6V Single-Supply Operation

o Ultra-Low Supply Current:

0.7mA while Operating

1µA in Shutdown Mode

o Ultra-Small 16-Pin QSOP Package

o Output Buffer Amplifiers Swing Rail to Rail

o 10MHz Serial Interface, Compatible with SPI, QSPI

(CPOL = CPHA = 0 or CPOL = CPHA = 1), and

Microwire

o Double-Buffered Registers for Synchronous

Updating

o Serial Data Output for Daisy Chaining

o Power-On Reset Clears Serial Interface and Sets

All Registers to Zero

o Software Shutdown

o Software-Programmable Logic Output

o Asynchronous Hardware Clear Resets All Internal

Registers to Zero

2.7V, Low-Power, 8-Bit Quad DAC

with Rail-to-Rail Output Buffers

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

OUTC

OUTD

AGND

DGND

DIN

SCLK

CS

OUTB

OUTA

REF

UPO

PDE

LDAC

CLR

DOUT

TOP VIEW

MAX533

DIP/QSOP

__________________Pin Configuration

19-1080; Rev 0; 6/96

PART

MAX533ACPE

MAX533BCPE

MAX533ACEE

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 Plastic DIP

16 Plastic DIP

16 QSOP

______________Ordering Information

**Contact factory for availability and processing to MIL-STD-883.

SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.

Functional Diagram appears at end of data sheet.

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

MAX533BCEE

0°C to +70°C

16 QSOP

MAX533BC/D

0°C to +70°C

Dice*

MAX533AEPE

-40°C to +85°C

16 Plastic DIP

MAX533BEPE

-40°C to +85°C

16 Plastic DIP

MAX533AEEE

-40°C to +85°C

16 QSOP

MAX533BEEE

-40°C to +85°C

16 QSOP

MAX533AMJE

-55°C to +125°C

16 CERDIP**

MAX533BMJE

-55°C to +125°C

16 CERDIP**

INL

(LSB)

±1

±2

±1

±2

±2

±1

±2

±1

±2

±1

±2