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General Description

The MAX5175/MAX5177 low-power, serial, voltage-out-

put, 12-bit digital-to-analog converters (DACs) feature a

precision output amplifier in a space-saving 16-pin

QSOP package. The MAX5175 operates from a single

+5V supply, and the MAX5177 operates from a single

+3V supply. The output amplifier’s inverting input is

available to allow specific gain configurations, remote

sensing, and high output current capability. This makes

the MAX5175/MAX5177 ideal for a wide range of appli-

cations, including industrial process control. Both

devices draw only 260µA of supply current, which

reduces to 1µA in shutdown mode. In addition, the pro-

grammable power-up reset feature allows for a user-

selectable output voltage state of either 0 or midscale.

The 3-wire serial interface is compatible with SPI™,

QSPI™, and MICROWIRE™ standards. An input register

followed by a DAC register provides a double-buffered

input, allowing the registers to be updated independent-

ly or simultaneously with a 16-bit serial word. Additional

features include software and hardware shutdown, shut-

down lockout, a hardware reset pin, and a reference

input capable of accepting DC and offset AC signals.

These devices provide a programmable digital output

pin for added functionality and a serial-data output pin

for daisy-chaining. All logic inputs are TTL/CMOS com-

patible and are internally buffered with Schmitt triggers

to allow direct interfacing to optocouplers.

The MAX5175/MAX5177 incorporate a proprietary on-chip

circuit that keeps the output voltage virtually “glitch free,”

limiting the glitches to a few millivolts during power-up.

Both devices come in 16-pin QSOP packages and are

specified for the extended (-40°C to +85°C) temperature

range. The MAX5171/MAX5173 are 14-bit pin-compatible

upgrades to the MAX5175/MAX5177. For pin-compatible

DACs with an internal reference, see the 13-bit

MAX5132/MAX5133 and 12-bit MAX5122/MAX5123.

Applications

Digitally Programmable 4–20mA Current Loops

Industrial Process Controls

Digital Offset and Gain Adjustment

Motion Control

Automatic Test Equipment (ATE)

Remote Industrial Controls

µP-Controlled Systems

Features

o ±1 LSB INL

o 1µA Shutdown Current

o “Glitch Free” Output Voltage at Power-Up

o Single-Supply Operation

+5V (MAX5175)

+3V (MAX5177)

o Full-Scale Output Range

o Adjustable Output Offset

o Low THD (-80dB) in Multiplying Operation

o SPI/QSPI/MICROWIRE-Compatible 3-Wire

Serial Interface

o Programmable Shutdown Mode and Power-Up

Reset (0 or midscale)

o Buffered Output Capable of Driving 4–20mA or

5k

Ω || 100pF Loads

o User-Programmable Digital Output Pin Allows

Serial Control of External Components

o 14-Bit Upgrades Available (MAX5171/MAX5173)

Low-Power, Serial, 12-Bit DACs with

Force/Sense Voltage Output

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

FB

N.C.

REF

AGND

SHDN

UPO

DOUT

DGND

TOP VIEW

MAX5175

MAX5177

QSOP

OUT

RS

CS

PDL

CLR

DIN

SCLK

19-1477; Rev 0; 4/99

PART

MAX5175AEEE

MAX5175BEEE

MAX5177AEEE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

16 QSOP

16 QSOP

16 QSOP

Functional Diagram appears at end of data sheet.

Pin Configuration

Ordering Information

MAX5177BEEE

-40°C to +85°C

16 QSOP

INL

(LSB)

±1

±2

±2

±4

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.