Datasheet

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

General Description

The MAX5141–MAX5144 are serial-input, voltage-output,

14-bit digital-to-analog converters (DACs) in tiny µMAX

packages, 50% smaller than comparable DACs in an

8-pin SO. They operate from low +3V (MAX5143/

MAX5144) or +5V (MAX5141/MAX5142) single supplies.

They provide 14-bit performance (±1LSB INL and DNL)

over temperature without any adjustments. The DAC out-

put is unbuffered, resulting in a low supply current of

120µA and a low offset error of 2LSBs.

The DAC output range is 0V to V

REF.

For bipolar opera-

tion, matched scaling resistors are provided in the

MAX5142/MAX5144 for use with an external precision op

amp (such as the MAX400), generating a ±V

REF

output

swing.

A 16-bit serial word is used to load data into the DAC

latch. The 25MHz, 3-wire serial interface is compatible

with SPI™/QSPI™/MICROWIRE™, and can interface

directly with optocouplers for applications requiring isola-

tion. A power-on reset circuit clears the DAC output to

code 0 (MAX5141/MAX5143) or code 8192 (MAX5142/

MAX5144) when power is initially applied.

A logic low on CLR asynchronously clears the DAC out-

put to code 0 (MAX5141/MAX5143) or code 8192

(MAX5142/MAX5144), independent of the serial interface.

The MAX5141/MAX5143 are available in 8-pin µMAX

packages and the MAX5142/MAX5144 are available in

10-pin µMAX packages.

Applications

High-Resolution and Gain Adjustment

Industrial Process Control

Automated Test Equipment

Data-Acquisition Systems

Features

♦ Miniature (3mm x 5mm) 8-Pin µMAX Package

♦ Low 120µA Supply Current

♦ Fast 1µs Settling Time

♦ 25MHz SPI/QSPI/MICROWIRE-Compatible Serial

Interface

♦ V

REF

Range Extends to V

♦ +5V (MAX5141/MAX5142) or +3V

(MAX5143/MAX5144) Single-Supply Operation

♦ Full 14-Bit Performance Without Adjustments

♦ Unbuffered Voltage Output Directly Drives 60kΩ

Loads

♦ Power-On Reset Circuit Clears DAC Output to

Code 0 (MAX5141/MAX5143) or Code 8192

(MAX5142/MAX5144)

♦ Schmitt-Trigger Inputs for Direct Optocoupler

Interface

♦ Asynchronous CLR

MAX5141–MAX5144

+3V/+5V, Serial-Input,

Voltage-Output, 14-Bit DACs

________________________________________________________________ Maxim Integrated Products 1

19-1849; Rev 1; 5/01

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART T EM P. RA N G E PIN - PAC K A GE IN L ( L SB )

SU PPL Y

R A NG E ( V)

O U TPU T SWING

M A X5 1 4 1E U A

-40°C to +85°C 8 µMAX ± 15 U nip ol ar

M A X5 1 4 2E U B

-40°C to +85°C 10 µMAX ± 15 Bi pol ar

M A X5 1 4 3E U A

-40°C to +85°C 8 µMAX ± 13 U nip ol ar

M A X5 1 4 4E U B

-40°C to +85°C 10 µMAX ± 13 Bi pol ar

GND

RFB

INV

DIN

SCLK

REF

TOP VIEW

MAX5142

MAX5144

OUT

CLR

µMAX

OUT

SCLK

DIN

REF

MAX5141

MAX5143

µMAX

GND

CLR

Pin Configurations

Summary of content (12 pages)

PAGE 1
9-1849; Rev 1; 5/01 +3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs Features ♦ Miniature (3mm x 5mm) 8-Pin µMAX Package ♦ Low 120µA Supply Current ♦ Fast 1µs Settling Time ♦ 25MHz SPI/QSPI/MICROWIRE-Compatible Serial Interface ♦ VREF Range Extends to VDD ♦ +5V (MAX5141/MAX5142) or +3V (MAX5143/MAX5144) Single-Supply Operation ♦ Full 14-Bit Performance Without Adjustments ♦ Unbuffered Voltage Output Directly Drives 60kΩ Loads ♦ Power-On Reset Circuit Clears DAC Output to Code 0 (MAX5141/MAX5143) or Code
PAGE 2
MAX5141–MAX5144 +3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V CS, SCLK, DIN, CLR to GND ...................................-0.3V to +6V REF to GND................................................-0.3V to (VDD + 0.3V) OUT, INV to GND .....................................................-0.3V to VDD RFB to INV ...................................................................
PAGE 3
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs (VDD = +3V (MAX5143/MAX5144) or +5V (MAX5141/MAX5142), VREF = +2.5V, TA = TMIN to TMAX, CL = 10pF, GND = 0, RL = ∞, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (VDD = +3V (MAX5143/MAX5144) or +5V (MAX5141/MAX5142), VREF = +2.5V, TA = TMIN to TMAX, GND = 0, RL = ∞, unless otherwise noted. Typical values are at TA = +25°C.) 0.075 0.050 0.025 0.09 0.08 0.07 0.06 -15 10 35 60 ZERO-CODE OFFSET ERROR vs. TEMPERATURE INTEGRAL NONLINEARITY vs. TEMPERATURE MAX5141 toc04 0.6 +INL 0 -0.1 -0.2 10 35 60 85 10 35 60 -0.20 -0.25 -0.
PAGE 5
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs REFERENCE CURRENT vs.
PAGE 6
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs MAX5141–MAX5144 Pin Descriptions PIN MAX5142 MAX5144 NAME 1 1 REF Voltage Reference Input 2 2 CS Chip-Select Input 3 3 SCLK 4 4 DIN Serial Data Input Clear Input. Logic low asynchronously clears the DAC to code 0 (MAX5141/MAX5143) or code 8192 (MAX5142/MAX5144). MAX5141 MAX5143 FUNCTION Serial Clock Input. Duty cycle must be between 40% and 60%. 5 5 CLR 6 6 OUT DAC Output Voltage INV Junction of Internal Scaling Resistors.
PAGE 7
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs MAX5141–MAX5144 +2.5V MAX6166 +3V/+5V 1µF 0.1µF 0.1µF PCS0 CS MOSI DIN SCLK SCLK IC1 (GND) REF VDD MC68XXXX CLR UNIPOLAR OUT MAX495 MAX5141 MAX5142 MAX5143 MAX5144 OUT EXTERNAL OP AMP GND Figure 2a. Typical Operating Circuit—Unipolar Output MAX6166 +3V/+5V +2.5V 1µF 0.1µF 0.
PAGE 8
MAX5141–MAX5144 +3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs to a standard R-2R ladder, allowing unbuffered operation in medium-load applications. The MAX5142/MAX5144 provide matched bipolar offset resistors, which connect to an external op amp for bipolar output swings (Figure 2b). applied. This ensures that unwanted DAC output voltages will not occur immediately following a system power-up, such as after a loss of power.
PAGE 9
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs Unbuffered Operation Unbuffered operation reduces power consumption as well as offset error contributed by the external output buffer. The R-2R DAC output is available directly at OUT, allowing 14-bit performance from +VREF to GND without degradation at zero scale. The DAC’s output impedance is also low enough to drive medium loads (RL > 60kΩ) without degradation of INL or DNL; only the gain error is increased by externally loading the DAC output.
PAGE 10
MAX5141–MAX5144 +3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs Unipolar Configuration Table 1. Unipolar Code Table Figure 2a shows the MAX5141–MAX5144 configured for unipolar operation with an external op amp. The op amp is set for unity gain, and Table 1 lists the codes for this circuit. Bipolar MAX5142/MAX5144 can also be used in unipolar configuration by connecting RFB and INV to REF. This allows the DAC to power up to midscale.
PAGE 11
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs 8LUMAXD.
PAGE 12
+3V/+5V, Serial-Input, Voltage-Output, 14-Bit DACs 10LUMAX.EPS MAX5141–MAX5144 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.