_______________General Description

The MAX512/MAX513 contain three 8-bit, voltage-output

digital-to-analog converters (DAC A, DAC B, and DAC C).

Output buffer amplifiers for DACs A and B provide voltage

outputs while reducing external component count. The

output buffer for DAC A can source or sink 5mA to within

unbuffered, providing a third voltage output with increased

accuracy. The MAX512 operates with a single

+5V ±10% supply, and the MAX513 operates with a

+2.7V to +3.6V supply. Both devices can also operate

with split supplies.

The 3-wire serial interface has a maximum operating fre-

quency of 5MHz and is compatible with SPI™, QSPI™,

and Microwire™. The serial input shift register is 16 bits

long and consists of 8 bits of DAC input data and 8 bits

for DAC selection and shutdown. DAC registers can be

loaded independently or in parallel at the positive edge

of

–

C

—

S

–

. A latched logic output is also available for auxil-

iary control.

Ultra-low power consumption and small packages

(14-pin DIP/SO) make the MAX512/MAX513 ideal for

portable and battery-powered applications. Supply cur-

rent is only 1mA, dropping to less than 1µA in shutdown.

Any of the three DACs can be independently shut down.

In shutdown mode, the DAC's R-2R ladder network is

disconnected from the reference input, minimizing sys-

tem power consumption.

________________________Applications

Digital Gain and Offset Adjustment

Programmable Attenuators

Programmable Current Sources

Programmable Voltage Sources

RF Digitally Adjustable Bias Circuits

VCO Tuning

____________________________Features

o Operate from a Single +5V (MAX512) or

+3V (MAX513) Supply, or from Bipolar Supplies

o Low Power Consumption

1mA Operating Current

<1µA Shutdown Current

o Unipolar or Bipolar Outputs

o 5MHz, 3-Wire Serial Interface

o SPI, QSPI, and Microwire Compatible

o Two Buffered, Bipolar-Output DACs (DACs A/B)

o Independently Programmable Shutdown Mode

o Space-Saving 14-Pin SO/DIP Packages

o Pin and Software Reset

______________Ordering Information

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

Low-Cost, Triple, 8-Bit Voltage-Output DACs

with Serial Interface

________________________________________________________________

Maxim Integrated Products

1

DAC

LATCH

A

DAC A

DAC

LATCH

B

DAC B

DAC

LATCH

C

LATCH

DAC C

SCLK

OUTA

OUTB

OUTC

LOUT

DIN

CS

REFAB

REFC

RESET

GND

MAX512

MAX513

12

4

56

7

8

9

10

11

12

14

3

________________Functional Diagram

1

2

3

4

14

13

12

11

LOUT

I.C.

REFAB

REFC

RESET

SCLK

CS

DIN

DIP/SO

TOP VIEW

MAX512

MAX513

5

6

7

10

9

8

OUTC

OUTB

OUTA

GND

__________________Pin Configuration

19-0252; Rev 2; 5/96

PART

TEMP. RANGE

PIN-PACKAGE

MAX512CPD

0°C to +70°C

14 Plastic DIP

MAX512CSD

0°C to +70°C

14 SO

MAX512C/D

0°C to +70°C

Dice*

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

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