_______________General Description

The MAX534 serial-input, voltage-output, 8-bit quad dig-

ital-to-analog converter (DAC) operates from a single

+4.5V to +5.5V supply. Internal precision buffers swing

rail to rail, and the reference input range includes both

ground and the positive rail. The MAX534 features a

2.5µA 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 independently or

simultaneously with a single software command. 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

MAX534 is available in a 16-pin QSOP that occupies the

same area as an 8-pin SO.

For operation guaranteed to 2.7V, see the MAX533

data sheet.

________________________Applications

Digital Gain and Offset Adjustments

Programmable Attenuators

Programmable Current Sources

Portable Instruments

____________________________Features

o +4.5V to +5.5V Single-Supply Operation

o Ultra-Low Supply Current:

0.8mA while Operating

2.5µA 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 (µC I/O

Extender)

o Asynchronous Hardware Clear Resets All Internal

Registers to Zero

+5V, 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

MAX534

DIP/QSOP

__________________Pin Configuration

19-1105; Rev 0; 8/96

PART

MAX534ACPE

MAX534BCPE

MAX534ACEE

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

MAX534BCEE

0°C to +70°C

16 QSOP

MAX534BC/D

0°C to +70°C

Dice*

MAX534AEPE

-40°C to +85°C

16 Plastic DIP

MAX534BEPE

-40°C to +85°C

16 Plastic DIP

MAX534AEEE

-40°C to +85°C

16 QSOP

MAX534BEEE

-40°C to +85°C

16 QSOP

MAX534AMJE

-55°C to +125°C

16 CERDIP**

MAX534BMJE

-55°C to +125°C

16 CERDIP**

INL

(LSB)

±1

±2

±1

±2

±2

±1

±2

±1

±2

±1

±2