Rainbow-electronics MAX5121 Bedienungsanleitung PDF herunterladen

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.

General Description

The MAX5120/MAX5121 are low-power, 12-bit, voltage-

output digital-to-analog converters (DACs) with an inter-

nal precision bandgap reference and an output amplifier.

The MAX5120 operates on a +5V supply with an internal

amplifier reference of +2.5V and is capable of a +4.095V

full-scale output range. The MAX5121, operating on +3V,

delivers its +2.0475V full-scale output with an internal

precision reference of +1.25V. If necessary, the user can

override the internal, <10ppm/°C voltage reference with

an external reference. Both devices draw only 500µA of

supply current, which reduces to 3µA in power-down

mode. In addition, their power-up reset feature allows for

a user-selectable initial output state of either 0V or mid-

scale and minimizes output voltage glitches during

power-up.

The serial interface is compatible with SPI™, QSPI™

and MICROWIRE™, which makes the MAX5120/

MAX5121 suitable for cascading multiple devices. Each

DAC has a double-buffered input organized as an input

ter loads data into the input register. The DAC register

may be updated independently or simultaneously with

the input register.

Both devices are available in a 16-pin QSOP package

and are specified for the extended industrial (-40°C to

+85°C) temperature range. For pin-compatible 14-bit

upgrades, see the MAX5170/MAX5172 data sheet;

for pin-compatible 13-bit versions, see the MAX5130/

MAX5131 data sheet.

________________________Applications

Industrial Process Controls

Automatic Test Equipment (ATE)

Digital Offset and Gain Adjustment

Motion Control

µP-Controlled Systems

Features

♦ Single-Supply Operation

+5V (MAX5120)

+3V (MAX5121)

♦ Full-Scale Output Range

+4.095V (MAX5120)

+2.0475V (MAX5121)

♦ Built-In 10ppm/°C (max) Precision Bandgap

Reference

+2.5V (MAX5120)

+1.25V (MAX5121)

♦ Adjustable Output Offset

♦ SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial

Interface

♦ Pin-Programmable Shutdown Mode and Power-

Up Reset (0V or Midscale Output Voltage)

♦ Buffered Output Capable of Driving 5kΩ 100pF

or 4–20mA Loads

♦ Space-Saving 16-Pin QSOP Package

♦ Pin-Compatible 13-Bit Upgrades Available

(MAX5130/MAX5131)

♦ Pin-Compatible 14-Bit Upgrades Available

(MAX5170/MAX5172)

MAX5120/MAX5121

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

with Internal Reference

________________________________________________________________

Maxim Integrated Products

OS V

REFADJ

REF

AGND

UPO

DOUT

DGND

TOP VIEW

MAX5120

MAX5121

QSOP

OUT

RSTVAL

PDL

CLR

DIN

SCLK

19-1428; Rev 0; 2/99

PART

MAX5120AEEE

MAX5120BEEE -40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

16 QSOP

Pin Configuration

Ordering Information

INL

(LSB)

±0.5

±1

MAX5121AEEE

MAX5121BEEE

±1

-40°C to +85°C

-40°C to +85°C 16 QSOP

16 QSOP ±2

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

1 2 3 4 5 6 ... 19 20

MAX5120/MAX5121 1

Inhaltsverzeichnis

Seite 1 - MAX5120/MAX5121

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.General Descript

Seite 2

MAX5120/MAX5121(MAX5120) and Figure 3b (MAX5121) to achieve theseadjustments. Connect a 33nF capacitor from REFADJto AGND to establish low-noise opera

Seite 3

Power-Down Lockout Input (PDL)The power-down lockout pin (PDL) disables shutdownwhen low. When in shutdown mode, a high-to-low tran-sition on PDL will

Seite 4

MAX5120/MAX5121The 16-bit input word may be sent in two 1-byte pack-ets (SPI-, MICROWIRE- and PIC16/PIC17-compatible),with CS low during this period.

Seite 5

Serial Data OutputThe contents of the internal shift register are outputserially on DOUT, which allows for daisy-chaining (seeApplications Information

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MAX5120/MAX5121__________Applications InformationDefinitionsIntegral Nonlinearity (INL)Integral nonlinearity (Figure 8a) is the deviation of thevalues

Seite 7

Settling TimeThe settling time is the amount of time required from thestart of a transition until the DAC output settles to its newoutput value within

Seite 8

TO OTHER SERIAL DEVICESMAX5120MAX5121DINSCLKCSMAX5120MAX5121MAX5120MAX5121DINDOUT DOUT DOUTSCLKCSI II IIIDINSCLKCSFigure 12. Daisy-Chaining Multiple

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