Rainbow-electronics MAX5548 Bedienungsanleitung PDF herunterladen

General Description

The MAX5548 dual, 8-bit, digital-to-analog converter

(DAC) features high-output-current capability. The

MAX5548 sources up to 30mA per DAC, making it ideal

for PIN diode biasing applications. Outputs can also be

paralleled for high-current applications (up to 60mA

typ). Operating from a single +2.7V to +5.25V supply,

the MAX5548 typically consumes 1.5mA per DAC in

normal operation and less than 1µA (max) in shutdown

mode. The MAX5548 also features low output leakage

current in shutdown mode (±1µA max) that is essential

to ensure that the external PIN diodes are off.

Additional features include an integrated +1.25V

bandgap reference, and a control amplifier to ensure

high accuracy and low-noise performance. A separate

reference input (REFIN) allows for the use of an external

reference source, such as the MAX6126, for improved

gain accuracy. A pin-selectable I

C*-/SPI™-compatible

serial interface provides optimum flexibility for the

MAX5548. The maximum programmable output current

value is set using software and an adjustment resistor.

The MAX5548 is available in a 3mm x 3mm, 16-pin, thin

QFN package, and is specified over the extended

(-40°C to +85°C) temperature range.

Applications

PIN Diode Biasing

RF Attenuator Control

VCO Tuning

Features

♦ Pin-Selectable I

C- or SPI-Compatible Interface

♦ Guaranteed Low Output Leakage Current in

Shutdown (±1µA max)

♦ Guaranteed Monotonic over Extended

Temperature Range

♦ Dual Outputs for Balanced Systems

♦ Current Outputs Source Up to 30mA per DAC

♦ Parallelable Outputs for 60mA Applications

♦ Output Stable with RF Filters

♦ Internal or External Reference Capability

♦ Digital Output (DOUT) Available for Daisy

Chaining in SPI Mode

♦ +2.7V to +5.25V Single-Supply Operation

♦ 16-Pin (3mm x 3mm) Thin QFN Package

♦ Programmable Output Current Range Set by

Software and Adjustment Resistor

MAX5548

Dual, 8-Bit, Programmable, 30mA

High-Output-Current DAC

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3836; Rev 0; 10/05

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

TEMP

RANGE

PIN-

PKG

CODE

TOP

MARK

MAX5548ETE

-40°C to

+85°C

16 Thin

QFN

T1633F-3 ACY

*Purchase of I

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

C Patent Rights to use these com-

ponents in an I

C system, provided that the system conforms

to the I

C Standard Specification as defined by Philips.

SPI is a trademark of Motorola, Inc.

+1.25V

REF

REFIN

BUFFER

8-BIT CURRENT-STEERING

DAC A

OUTA

FSADJA

OUTB

FSADJB

GND

DOUT/A1

CS/A0

DIN/SDASCLK/SCL

SPI/I2C

16-BIT INPUT REGISTER

DAC REGISTER A

DAC REGISTER B

8-BIT CURRENT-STEERING

DAC B

MAX5548

Functional Diagram

Pin Configuration appears at end of data sheet.

1 2 3 4 5 6 ... 14 15

High-Output-Current DAC 1

Inhaltsverzeichnis

Seite 1 - High-Output-Current DAC

General DescriptionThe MAX5548 dual, 8-bit, digital-to-analog converter(DAC) features high-output-current capability. TheMAX5548 sources up to 30mA pe

Seite 2

MAX5548Early STOP ConditionsThe MAX5548 recognizes a STOP condition at any pointduring transmission except if a STOP condition occurs inthe same high

Seite 3

address bits and a read/write bit (R/W). When idle, thedevice continuously waits for a START condition fol-lowed by its slave address. When the device

Seite 4

MAX5548Applications InformationDaisy Chaining (SPI/I2C= VDD)In standard SPI-/QSPI™-/MICROWIRE™-compatiblesystems, a microcontroller (µC) communicates

Seite 5

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC______________________________________________________________________________________ 1

Seite 6

MAX5548Power SequencingEnsure that the voltage applied to REFIN does notexceed VDDat any time. If proper power sequencing isnot possible, connect an e

Seite 7

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DACMaxim cannot assume responsibility for use of any circuitry other than circuitry entirel

Seite 8

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC2 ______________________________________________________________________________________

Seite 9

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC_______________________________________________________________________________________

Seite 10

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC4 ______________________________________________________________________________________

Seite 11

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC_______________________________________________________________________________________

Seite 12

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC6 ______________________________________________________________________________________

Seite 13

MAX5548Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC_______________________________________________________________________________________

Seite 14

MAX5548Detailed DescriptionArchitectureThe MAX5548 8-bit, dual current-steering DAC (see theFunctional Diagram) operates with DAC update ratesup to 10

Seite 15

mode) facilitate communication between the MAX5548and the master. The serial interface remains active in shutdown.I2C Compatibility (SPI/I2C= GND)The

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Inhaltsverzeichnis

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