MAX1268BEEG+中文资料

19-2722; Rev 0; 04/03

with +2.5V Reference and Parallel Interface

420ksps, +5V, 6-/2-Channel, 12-Bit ADCsGeneral Description

Features

The MAX1266/MAX1268 low-power, 12-bit analog-to-digital converters (ADCs) feature a successive-approxi-o12-Bit Resolution, ±0.5 LSB Linearitymation ADC, automatic power-down, fast wake-upoSingle +5V Operation(2µs), an on-chip clock, +2.5V internal reference, and ahigh-speed 12-bit parallel interface. They operate withoInternal +2.5V Reference

a single +5V analog supply.

oSoftware-Configurable Analog Input Multiplexer

Power consumption is only 10mW at the maximum sam-6-Channel Single Ended/

pling rate of 420ksps. Two software-selectable power-3-Channel Pseudo-Differential (MAX1266)down modes enable the MAX1266/MAX1268 to be shut2-Channel Single Ended/

down between conversions; accessing the parallel1-Channel Pseudo-Differential (MAX1268)interface returns them to normal operation. Poweringdown between conversions can reduce supply belowoSoftware-Configurable Unipolar/Bipolar 10µA at lower sampling rates.

Analog InputsBoth devices offer software-configurable analog inputs foroLow Current

unipolar/bipolar and single-ended/pseudo-differential2.8mA (420ksps)operation. In single-ended mode, the MAX1266 has six1.0mA (100ksps)input channels and the MAX1268 has two (three input400µA (10ksps)channels and one input channel, respectively, when in2µA (Shutdown)

pseudo-differential mode).

oInternal 6MHz Full-Power Bandwidth Track/HoldExcellent dynamic performance and low power, com-bined with ease of use and small package size, makeoParallel 12-Bit Interfacethese converters ideal for battery-powered and data-acquisition applications or for other circuits with demand-oSmall Footprint

ing power-consumption and space requirements. The28-Pin QSOP (MAX1266)MAX1266 is offered in a 28-pin QSOP package, while the24-Pin QSOP (MAX1268)

MAX1268 is available in a 24-pin QSOP. For pin-compati-ble +3V, 12-bit versions, see the MAX1265/MAX1267.

Pin Configurations

Applications

Industrial Control SystemsData LoggingEnergy ManagementPatient MonitoringData-Acquisition Systems

Touch Screens

Ordering Information

Typical Operating Circuits appear at end of data sheet.

________________________________________________________________Maxim Integrated Products1

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://www.77cn.com.cn.

MAX1266/MAX1268

420ksps, +5V, 6-/2-Channel, 12-Bit ADCs

with +2.5V Reference and Parallel InterfaceMAX1266/MAX1268

ABSOLUTE MAXIMUM RATINGS

VDDto GND..............................................................-0.3V to +6VCH0–CH5, COM to GND............................-0.3V to (VDD+ 0.3V)REF, REFADJ to GND.................................-0.3V to (VDD+ 0.3V)Digital Inputs to GND...............................................-0.3V to +6VDigital Outputs (D0–D11, INT) to GND.......-0.3V to (VDD+ 0.3V)Continuous Power Dissipation (TA= +70°C)

24-Pin QSOP (derate 9.5mW/°C above +70°C)..........762mW28-Pin QSOP (derate 8.0mW/°C above +70°C)..........667mW

Operating Temperature Ranges

MAX1266_C_ _/MAX1268_C_ _.........................0°C to +70°CMAX1266_E_ _/MAX1268_E_ _......................-40°C to +85°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VDD= +5V ±10%, COM = GND, REFADJ = VDD, VREF= +2.5V, 4.7µF capacitor at REF pin, fCLK = 7.6MHz (50% duty cycle), TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)

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420ksps, +5V, 6-/2-Channel, 12-Bit ADCswith +2.5V Reference and Parallel Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±10%, COM = GND, REFADJ = VDD, VREF= +2.5V, 4.7µF capacitor at REF pin, fCLK = 7.6MHz (50% duty cycle), TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)

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MAX1266/MAX1268

420ksps, +5V, 6-/2-Channel, 12-Bit ADCs

with +2.5V Reference and Parallel InterfaceMAX1266/MAX1268

TIMING CHARACTERISTICS

(VDD= +5V ±10%, COM = GND, REFADJ = VDD, VREF= +2.5V, 4.7µF capacitor at REF pin, fCLK = 7.6MHz (50% duty cycle), TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)

Note 1:Tested at VDD= +5V, COM = GND, unipolar single-ended input mode.

Note 2:Relative accuracy is the deviation of the analog value at any code from its theoretical value after offset and gain errors have

been removed.

Note 3:Offset nulled.

Note 4:On channel is grounded; sine wave applied to off channels.

Note 5:Conversion time is defined as the number of clock cycles times the clock period; clock has a 50% duty cycle.Note 6:Input voltage range referenced to negative input. The absolute range for the analog inputs is from GND to VDD.Note 7:External load should not change during conversion for specified accuracy.

Note 8:When bit 5 is set low for internal acquisition, WRmust not return low until after the first fall …… 此处隐藏：25402字，全部文档内容请下载后查看。喜欢就下载吧 ……