Rainbow-electronics MAX5231 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX5230/MAX5231 low-power, dual 12-bit voltage-

output digital-to-analog converters (DACs) feature an

internal 3ppm/°C precision bandgap voltage reference

and precision output amplifiers. The MAX5231 operates

on a single 5V supply with an internal 2.5V reference and

features a 4.095V full-scale output range. The MAX5230

operates on a single 3V supply with an internal 1.25V ref-

erence and features a 2.0475V full-scale output range.

The MAX5231 consumes only 470µA while the MAX5230

consumes only 420µA of supply current. Both devices

feature low-power (2µA) software- and hardware-

enabled shutdown modes.

The MAX5230/MAX5231 feature a 13.5MHz SPI™-,

QSPI™-, and MICROWIRE™-compatible 3-wire serial

interface. An additional data output (DOUT) allows for

daisy-chaining and read back. Each DAC has a double-

buffered digital input. The MAX5230/MAX5231 feature

two software-selectable shutdown output impedances:

1kΩ or 200kΩ. A power-up reset feature sets DAC out-

puts at ground or at the midscale DAC code.

The MAX5230/MAX5231 are specified over the extended

temperature range (-40°C to +85°C) and are available in

16-pin QSOP packages.

Applications

Industrial Process Controls

Automatic Test Equipment

Digital Offset and Gain Adjustment

Motion Control

µP-Controlled Systems

Features

♦ Internal 3ppm/°C Precision Bandgap Reference

2.465V (MAX5231)

1.234V (MAX5230)

♦ 10ppm/°C (max) Full-Scale Output Range

4.095V (MAX5231)

2.0475V (MAX5230)

♦ Single-Supply Operation

5V (MAX5231)

3V (MAX5230)

♦ Low Supply Current

470µA (MAX5231)

420µA (MAX5230)

♦ 13.5MHz SPI/QSPI/MICROWIRE-Compatible,

3-Wire Serial Interface

♦ Pin-Programmable Power-Up Reset State to Zero

or Midscale Output Voltage

♦ Programmable Shutdown Modes with 1kΩ or

200kΩ Internal Output Loads

♦ Recalls Output State Prior to Shutdown or Reset

♦ Buffered Output Drives 5kΩ || 100pF Loads

♦ Space-Saving 16-Pin QSOP Package

MAX5230/MAX5231

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

with Internal Reference

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2332; Rev 0; 1/02

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.

Functional Diagram appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor, Corp.

PART TEMP RANGE

PIN-

PACKAGE

INL

(LSB)

MAX5230AEEE -40°C to +85°C 16 QSOP ±0.5

MAX5230BEEE -40°C to +85°C 16 QSOP ±1

MAX5231AEEE -40°C to +85°C 16 QSOP ±0.5

MAX5231BEEE -40°C to +85°C 16 QSOP ±1

OSA OSB

OUTB

AGND

REF

PDL

DOUT

DGND

TOP VIEW

MAX5230

MAX5231

QSOP

OUTA

RSTV

DIN

CLR

LDAC

SCLK

Pin Configuration

1 2 3 4 5 6 ... 17 18

MAX5230/MAX5231 1

Resumo do Conteúdo

Página 1 - MAX5230/MAX5231

General DescriptionThe MAX5230/MAX5231 low-power, dual 12-bit voltage-output digital-to-analog converters (DACs) feature aninternal 3ppm/°C precision

Página 2

MAX5230/MAX52313V/5V, 12-Bit, Serial Voltage-Output Dual DACswith Internal Reference10 _______________________________________________________________

Página 3

Detailed DescriptionThe MAX5230/MAX5231 12-bit, voltage-output DACsare easily configured with a 3-wire SPI-, QSPI-,MICROWIRE-compatible serial interfa

Página 4

MAX5230/MAX5231Serial InterfaceThe 3-wire serial interface (SPI, QSPI, MICROWIREcompatible) used in the MAX5230/MAX5231 allows forcomplete control of

Página 5

Power-Down and Shutdown ModesAs described in Tables 2 and 3, several serial interfacecommands put one or both of the DACs into shutdownmode. Shutdown

Página 6

MAX5230/MAX5231Applications InformationDefinitionsIntegral Nonlinearity (INL)Integral nonlinearity (Figure 6a) is the deviation of the val-ues on an a

Página 7

Digital FeedthroughDigital feedthrough is noise generated on the DAC’soutput when any digital input transitions. Proper boardlayout and grounding sign

Página 8

MAX5230/MAX5231Power-Supply and BypassingConsiderationsOn power-up, the input and DAC registers are clearedto either zero (RSTV = DGND) or midscale (R

Página 9