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Low-Power, Dual, 12-Bit Voltage-Output DACs

with Configurable Outputs

________________________________________________________________

Maxim Integrated Products

1

19-1317; Rev 1; 12/97

_______________General Description

The MAX5156/MAX5157 low-power, serial, voltage-out-

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

consume only 500µA from a single +5V (MAX5156) or

+3V (MAX5157) supply. These devices feature Rail-to-

16-pin QSOP and DIP packages. Access to the invert-

ing input allows for specific gain configurations, remote

sensing, and high output current capability, making

these devices ideally suited for industrial process con-

trols. These devices are also well suited for digitally

programmable (4–20mA) current loops.

The 3-wire serial interface is SPI™/QSPI™ and

Microwire™ compatible. Each DAC has a double-

buffered input organized as an input register followed

by a DAC register, which allows the input and DAC reg-

isters to be updated independently or simultaneously.

Additional features include a programmable shutdown

(2µA), hardware-shutdown lockout, a separate voltage

reference for each DAC, power-on reset, and an active-

low clear input (CL) that resets all registers and DACs to

zero. The MAX5156/MAX5157 provide a programmable

logic output pin for added functionality, and a serial-

data output pin for daisy chaining.

________________________Applications

Industrial Process Control

Motion Control

Digital Offset and Gain

Digitally Programmable

Adjustment

4–20mA Current Loops

Remote Industrial Controls

Automatic Test Equipment

____________________________Features

o 12-Bit Dual DAC with Configurable Output

Amplifier

o Single-Supply Operation: +5V (MAX5156)

+3V (MAX5157)

o Rail-to-Rail Output Swing

o Low Quiescent Current: 500µA (normal operation)

2µA (shutdown mode)

o Power-On Reset Clears DAC Outputs to Zero

o SPI/QSPI and Microwire Compatible

o Space-Saving 16-Pin QSOP Package

_______________Ordering Information

Rail-to-Rail is a registered trademark of Nippon Motorola Ltd. SPI and QSPI are trademarks of Motorola, Inc.

Microwire is a trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

Pin Configuration appears at end of data sheet.

REFA

CL

DOUT

16-BIT

SHIFT

REGISTER

SR

CONTROL

INPUT

REG A

SCLK UPO

REFB

DIN

CS

DAC A

DAC B

FBA

FBB

OUTA

OUTB

DAC

REG A

INPUT

REG B

LOGIC

OUTPUT

DECODE

CONTROL

DAC

REG B

MAX5156

MAX5157

AGND

DGND

PDL

_________________________________________________________Functional Diagram

INL

(LSB)

PIN-PACKAGE

TEMP. RANGE

PART

±1

16 QSOP

0°C to +70°C

MAX5156BCEE

±1/2

±1

±1/2

16 QSOP

16 Plastic DIP

16 Plastic DIP

0°C to +70°C

0°C to +70°C

0°C to +70°C

MAX5156ACEE

MAX5156BCPE

MAX5156ACPE