Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) SOIC 8 N

General Description

The MAX5544 serial-input, voltage-output, 14-bit

monotonic digital-to-analog converter (DAC) operates

from a single +5V supply. The DAC output is

unbuffered, resulting in low 0.3mA supply current and

low 1LSB offset error. The DAC output range is 0V to

. The DAC latch accepts a 16-bit serial word. A

power-on reset circuit clears the DAC output to 0V

(unipolar mode) when power is initially applied.

The 10MHz 3-wire serial interface is SPI™/QSPI™/

MICROWIRE™ compatible and interfaces directly with

optocouplers for applications requiring isolation. The

MAX5544 is available in an 8-pin SO package.

Applications

High-Resolution Offset and Gain Adjustment

Industrial Process Control

Automated Test Equipment

Data Acquisition Systems

Features

♦ Full 14-Bit Performance Without Adjustments

♦ +5V Single-Supply Operation

♦ Low Power: 1.5mW

♦ 1µs Settling Time

♦ Unbuffered Voltage Output Directly Drives 60kΩ

Loads

♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface

♦ Power-On Reset Circuit Clears DAC Output to 0V

(unipolar mode)

♦ Schmitt Trigger Inputs for Direct Optocoupler

Interface

MAX5544

Low-Cost, +5V, Serial-Input,

Voltage-Output, 14-Bit DAC

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

DIN

REF

SCLK

DGND

AGND

OUT

MAX5544

Pin Configuration

14-BIT DAC

16-BIT DATA LATCH

SERIAL INPUT REGISTER

CONTROL

LOGIC

MAX5544

REF

DIN

SCLK

AGND

OUT

DGND

Functional Diagram

19-1571; Rev 0; 12/99

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

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

For small orders, phone 1-800-835-8769.

PART

MAX5544CSA

MAX5544ESA

TEMP. RANGE

0°C to +70°C

-40°C to +85°C

PIN-PACKAGE

8 SO

Summary of content (8 pages)

PAGE 1
9-1571; Rev 0; 12/99 Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC Features The MAX5544 serial-input, voltage-output, 14-bit monotonic digital-to-analog converter (DAC) operates from a single +5V supply. The DAC output is unbuffered, resulting in low 0.3mA supply current and low 1LSB offset error. The DAC output range is 0V to VREF. The DAC latch accepts a 16-bit serial word. A power-on reset circuit clears the DAC output to 0V (unipolar mode) when power is initially applied.
PAGE 2
MAX5544 Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC ABSOLUTE MAXIMUM RATINGS VDD to DGND............................................................-0.3V to +6V CS, SCLK, DIN to DGND..........................................-0.3V to +6V REF to AGND...............................................-0.3V to (VDD +0.3V) AGND to DGND.....................................................-0.3V to +0.3V OUT to AGND, DGND.................................. ............-0.
PAGE 3
Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC (VDD = +5V ±5%, VREF = +2.5V, VAGND = VDGND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (VDD = +5V, VREF = +2.5V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT (mA) 0.35 0.30 0.32 0.31 0.30 0.29 0.28 0.27 0.25 0.26 0.20 0 20 40 60 80 0.05 0 -0.05 -0.10 -0.15 100 0 1 2 TEMPERATURE (°C) 3 4 5 -60 6 -20 DIFFERENTIAL NONLINEARITY vs. TEMPERATURE 0.20 100 140 100 140 16k 20k GAIN ERROR vs. TEMPERATURE 0.20 MAX5544-05 0.30 MAX5544-04 0.
PAGE 5
Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC FULL-SCALE STEP RESPONSE (fSCLK = 10MHz) MAX5544-11 MAX5544-10 FULL-SCALE STEP RESPONSE (fSCLK = 20MHz) OUT 500mV/div OUT 500mV/div 1µs/div 400ns/div CL = 13pF RL = ∞ CL = 13pF RL = ∞ MAJOR-CARRY OUTPUT GLITCH MAX5544-13 MAX5544-12 DIGITAL FEEDTHROUGH CS 5V/div SCLK 5V/div OUT AC-COUPLED 100mV/div OUT AC-COUPLED 50mV/div 2µs/div CODE = 0000 hex 2µs/div ______________________________________________________________Pin Description P
PAGE 6
MAX5544 Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC Detailed Description The MAX5544 voltage-output, 14-bit digital-to-analog converter (DAC) offers 14-bit monotonicity with less than 1LSB differential linearity error. Serial-data transfer minimizes the number of package pins required. The MAX5544 is composed of two matched DAC sections, with a 12-bit inverted R-2R DAC forming the 12LSBs and the 4MSBs derived from 15 identically matched resistors.
PAGE 7
Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC Reference and Analog Ground Inputs The MAX5544 operates with external voltage references from 2V to 3V, and maintains 14-bit performance with proper reference selection and application. Ideally, the reference’s temperature coefficient should be less than 1.5ppm/°C to maintain 14-bit accuracy to within 1LSB over the commercial (0°C to +70°C) temperature range.
PAGE 8
MAX5544 Low-Cost, +5V, Serial-Input, Voltage-Output, 14-Bit DAC The external buffer amplifier’s gain-bandwidth product is important because it increases the settling time by adding another time constant to the output response. The effective time constant of two cascaded systems, each with a single time-constant response, is approximately the root square sum of the two time constants. The DAC output’s time constant is 1µs / 10.4 = 96ns, ignoring the effect of additional capacitance.