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General Description

The MAX5120/MAX5121 are low-power, 12-bit, voltage-

output digital-to-analog converters (DACs) with an inter-

nal precision bandgap reference and an output amplifier.

The MAX5120 operates on a +5V supply with an internal

amplifier reference of +2.5V and is capable of a +4.095V

full-scale output range. The MAX5121, operating on +3V,

delivers its +2.0475V full-scale output with an internal

precision reference of +1.25V. If necessary, the user can

override the internal, <10ppm/°C voltage reference with

an external reference. Both devices draw only 500µA of

supply current, which reduces to 3µA in power-down

mode. In addition, their power-up reset feature allows for

a user-selectable initial output state of either 0V or mid-

scale and minimizes output voltage glitches during

power-up.

The serial interface is compatible with SPI™, QSPI™

and MICROWIRE™, which makes the MAX5120/

MAX5121 suitable for cascading multiple devices. Each

DAC has a double-buffered input organized as an input

register followed by a DAC register. A 16-bit shift regis-

ter loads data into the input register. The DAC register

may be updated independently or simultaneously with

the input register.

Both devices are available in a 16-pin QSOP package

and are specified for the extended industrial (-40°C to

+85°C) temperature range. For pin-compatible 14-bit

upgrades, see the MAX5170/MAX5172 data sheet;

for pin-compatible 13-bit versions, see the MAX5130/

MAX5131 data sheet.

________________________Applications

Industrial Process Controls

Automatic Test Equipment (ATE)

Digital Offset and Gain Adjustment

Motion Control

µP-Controlled Systems

Features

o Single-Supply Operation

+5V (MAX5120)

+3V (MAX5121)

o Full-Scale Output Range

+4.095V (MAX5120)

+2.0475V (MAX5121)

o Built-In 10ppm/°C (max) Precision Bandgap

Reference

+2.5V (MAX5120)

+1.25V (MAX5121)

o Adjustable Output Offset

o SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial

Interface

o Pin-Programmable Shutdown Mode and Power-

Up Reset (0V or Midscale Output Voltage)

o Buffered Output Capable of Driving 5k

Ω 100pF

or 4–20mA Loads

o Space-Saving 16-Pin QSOP Package

o Pin-Compatible 13-Bit Upgrades Available

(MAX5130/MAX5131)

o Pin-Compatible 14-Bit Upgrades Available

(MAX5170/MAX5172)

+3V/+5V, 12-Bit, Serial Voltage-Output DACs

with Internal Reference

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

OS

REFADJ

REF

AGND

PD

UPO

DOUT

DGND

TOP VIEW

MAX5120

MAX5121

QSOP

OUT

RSTVAL

CS

PDL

CLR

DIN

SCLK

19-1428; Rev 0; 2/99

PART

MAX5120AEEE

MAX5120BEEE

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

16 QSOP

16 QSOP

Pin Configuration

Ordering Information

INL

(LSB)

±0.5

±1

MAX5121AEEE

MAX5121BEEE

±1

-40°C to +85°C

-40°C to +85°C

16 QSOP

16 QSOP

±2

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.