Rainbow-electronics MAX1068 Bedienungsanleitung PDF herunterladen

General Description

The MAX1067/MAX1068 low-power, multichannel, 14-

bit analog-to-digital converters (ADCs) feature a suc-

cessive-approximation ADC, integrated +4.096V

reference, a reference buffer, an internal oscillator,

automatic power-down, and a high-speed SPI™/

QSPI™/MICROWIRE™-compatible interface. The

MAX1067/MAX1068 operate with a single +5V analog

supply and feature a separate digital supply, allowing

direct interfacing with +2.7V to +5.5V digital logic.

The MAX1067/MAX1068 consume only 2.9mA (AV

= +5V) at 200ksps when using an external refer-

ence. AutoShutdown™ reduces the supply current to

145µA at 10ksps and to less than 10µA at reduced sam-

pling rates.

The MAX1067 includes a 4-channel input multiplexer, and

the MAX1068 accepts up to eight analog inputs.

In addition, digital signal processor (DSP)-initiated con-

versions are simplified with the DSP frame-sync input and

output featured in the MAX1068. The MAX1068 includes a

data-bit transfer input to select between 8-bit-wide or 16-

bit-wide data-transfer modes. Both devices feature a scan

mode that converts each channel sequentially or one

channel continuously.

Excellent dynamic performance and low power, com-

bined with ease of use and an integrated reference,

make the MAX1067/MAX1068 ideal for control and data-

acquisition operations or for other applications with

demanding power consumption and space require-

ments. The MAX1067 is available in a 16-pin QSOP

package, and the MAX1068 is available in a 24-pin

QSOP package. Both devices are guaranteed over the

commercial (0°C to +70°C) and extended (-40°C to

+85°C) temperature ranges. Use the MAX1168 evalua-

tion kit to evaluate the MAX1068.

Applications

Motor Control

Industrial Process Control

Industrial I/O Modules

Data-Acquisition Systems

Thermocouple Measurements

Accelerometer Measurements

Features

♦ 14-Bit Resolution, ±0.5 LSB INL and

±1 LSB DNL (max)

♦ +5V Single-Supply Operation

♦ Adjustable Logic Level (+2.7V to +5.25V)

♦ Input Voltage Range: 0 to V

REF

♦ Internal (+4.096V) or External (+3.8V to AV

)

Reference

♦ Internal Track/Hold, 4MHz Input Bandwidth

♦ Internal or External Clock

♦ SPI/QSPI/MICROWIRE-Compatible Serial

Interface, MAX1068 Performs DSP-Initiated

Conversions

♦ 8-Bit-Wide or 16-Bit-Wide Data-Transfer Mode

(MAX1068 Only)

♦ 4-Channel (MAX1067) or 8-Channel (MAX1068)

Input Mux

Scan Mode Sequentially Converts Multiple

Channels or One Channel Continuously

♦ Low Power

2.9mA at 200ksps

1.45mA at 100ksps

145µA at 10ksps

0.6µA in Full Power-Down Mode

♦ Small Package Size

16-Pin QSOP (MAX1067)

24-Pin QSOP (MAX1068)

MAX1067/MAX1068

Multichannel, 14-Bit, 200ksps Analog-to-Digital

Converters

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2955; Rev 0; 8/03

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-

PACKAGE

INL

(LSB)

MAX1067ACEE 0°C to +70°C 16 QSOP ±0.5

MAX1067BCEE 0°C to +70°C 16 QSOP ±1

MAX1067CCEE 0°C to +70°C 16 QSOP ±2

MAX1067AEEE -40°C to +85°C 16 QSOP ±0.5

MAX1067BEEE -40°C to +85°C 16 QSOP ±1

MAX1067CEEE -40°C to +85°C 16 QSOP ±2

Ordering Information continued at end of data sheet.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

1 2 3 4 5 6 ... 29 30

MAX1067/MAX1068 1
Converters 1

Inhaltsverzeichnis

Seite 1 - Converters

General DescriptionThe MAX1067/MAX1068 low-power, multichannel, 14-bit analog-to-digital converters (ADCs) feature a suc-cessive-approximation ADC, in

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters10 ___________________________________________________________________________

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Detailed DescriptionThe MAX1067/MAX1068 low-power, multichannel, 14-bit ADCs feature a successive-approximation ADC,automatic power-down, integrated +

Seite 4

MAX1067/MAX1068During the acquisition, the analog input (AIN_) chargescapacitor CDAC. At the end of the acquisition intervalthe T/H switches open. The

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that includes a longer acquisition time (11.5 clockcycles). Longer acquisition times are useful in applica-tions with input source resistances greater

Seite 6

MAX1067/MAX1068Digital InterfaceThe MAX1067/MAX1068 feature an SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. TheMAX1067 digital interface con

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

Seite 8

MAX1067/MAX1068Power-Down ModesTable 5 shows the MAX1067/MAX1068 power-downmodes. Three internal reference modes and one exter-nal reference mode are

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minimum high and low times are at least 93ns. Externalclock-mode conversions with SCLK rates less than125kHz can reduce accuracy due to leakage of the

Seite 10

MAX1067/MAX1068prior to the rising edge of CS, cause zeros to beclocked out of DOUT. The MAX1068 external clock 16-bit-wide data-transfer mode require

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sition. Use the EOC high-to-low transition as the signalto restart the external clock (SCLK). To read the entireconversion result, 16 SCLK cycles are

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters2 ____________________________________________________________________________

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MAX1067/MAX1068Internal Clock 16-Bit-Wide Data-Transfer andScan Mode (MAX1068 Only)Force DSPR high and DSEL low for the SPI/QSPI/MICROWIRE-interface m

Seite 14

DSP 8-Bit-Wide Data-Transfer Mode (External ClockMode, MAX1068 Only)Figure 16 shows the DSP-interface timing diagram.Logic low at DSPR on the falling

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MAX1067/MAX10684.8MHz (the maximum clock frequency). For lowerclock frequencies, ensure the minimum high and lowtimes are at least 93ns. External-cloc

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters24 ___________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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DSP InterfaceThe DSP mode of the MAX1068 only operates in exter-nal clock mode. Figure 23 shows a typical DSP interfaceconnection to the MAX1068. Use

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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Total Harmonic DistortionTotal harmonic distortion (THD) is the ratio of the RMSsum of the first five harmonics of the input signal to thefundamental

Seite 22

MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConvertersMaxim cannot assume responsibility for use of any circuitry other than circuit

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters4 ____________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters6 ____________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters______________________________________________________________________________

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MAX1067/MAX1068Multichannel, 14-Bit, 200ksps Analog-to-DigitalConverters8 ____________________________________________________________________________

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OFFSET ERROR vs. SUPPLY VOLTAGEMAX1067/68 toc17AVDD (V)OFFSET ERROR (µV)5.154.85 5.054.95-150-100-50050100150200-2004.75 5.25VREF = +4.096VGAIN ERROR

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Rainbow-electronics MAX1068 Bedienungsanleitung

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