MAX1283BCUE中文资料

Serial 12-Bit ADCs with Internal Reference

General Description

The MAX1282/MAX1283 12-bit analog-to-digital convert-ers (ADCs) combine a 4-channel analog-input multiplexer, 4-Channel Single-Ended or 2-Channelhigh-bandwidth track/hold (T/H), and serial interface withPseudo-Differential Inputshigh conversion speed and low power consumption. The Internal Multiplexer and Track/HoldMAX1282 operates from a single +4.5V to +5.5V supply;the MAX1283 operates from a single +2.7V to +3.6V sup- Single-Supply Operation

ply. Both devices’ analog inputs are software configurable+4.5V to +5.5V (MAX1282)for unipolar/bipolar and single-ended/pseudo-differential+2.7V to +3.6V (MAX1283)operation.

Internal +2.5V Reference

The 4-wire serial interface connects directly toSPI /QSPI /MICROWIRE devices without external 400kHz Sampling Rate (MAX1282)logic. A serial strobe output allows direct connection to Low Power: 2.5mA (400ksps)

TMS320-family digital signal processors. The MAX1282/1.3mA (REDP)MAX1283 use an external serial-interface clock to perform0.9mA (FASTPD)successive-approximation analog-to-digital conversions.2µA (FULLPD)

The devices feature an internal +2.5V reference and a ref-erence-buffer amplifier with a ±1.5% voltage-adjustment SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wirerange. An external reference with a 1V to VSerial Interfacealso be used.

DDrange may Software-Configurable Unipolar or Bipolar InputsThe MAX1282/MAX1283 provide a hardwired SHDNpinand four software-selectable power modes (normal opera- 16-Pin TSSOP Package

tion, reduced power (REDP), fast power-down (FASTPD),and full power-down (FULLPD)). These devices can beprogrammed to automatically shut down at the end of aOrdering Information

conversion or to operate with reduced power. When usingthe power-down modes, accessing the serial interfaceautomatically powers up the devices, and the quick turn-on time allows them to be shut down between all conver-sions.

The MAX1282/MAX1283 are available in 16-pin TSSOPpackages.

Pin Configuration

Portable Data Logging Data AcquisitionMedical Instruments Battery-Powered InstrumentsPen Digitizers Process Control

Typical Operating Circuit appears at end of data sheet.SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

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MAX1282/MAX1283

300ksps/400ksps, Single-Supply, 4-Channel,Serial 12-Bit ADCs with Internal ReferenceMAX1282/MAX1283

ABSOLUTE MAXIMUM RATINGS

VDD_ to GND...........................................................-0.3V to +6VVDD1to VDD2.......................................................-0.3V to +0.3VCH0–CH3, 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 to GND.............................-0.3V to (VDD_ +0.3V)Digital Output Sink Current.................................................25mA

Continuous Power Dissipation (TA= +70°C)

16-Pin TSSOP (derate 6.7mW/°C above +70°C)........535mWOperating Temperature Ranges

MAX1282BCUE/MAX1283BCUE.......................0°C to +70°CMAX1282BEUE/MAX1283BEUE.....................-40°C to +85°CStorage Temperature Range............................-60°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—MAX1282

(VDD1= VDD2= +4.5V to +5.5V, COM = GND, fOSC= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external

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300ksps/400ksps, Single-Supply, 4-Channel,Serial 12-Bit ADCs with Internal Reference

ELECTRICAL CHARACTERISTICS—MAX1282 (continued)

(VDD1= VDD2= +4.5V to +5.5V, COM = GND, fOSC= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external

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MAX1282/MAX1283

300ksps/400ksps, Single-Supply, 4-Channel,Serial 12-Bit ADCs with Internal ReferenceMAX1282/MAX1283

ELECTRICAL CHARACTERISTICS—MAX1282 (continued)

(VDD1= VDD2= +4.5V to +5.5V, COM = GND, fOSC= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external+2.5V at REF, REFADJ = VDD1, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX1283

(VDD1= VDD2= +2.7V to +3.6V, COM = GND, fOSC= 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), external+2.5V at REF, REFADJ = V, T= Tto T, unless otherwise noted. Typical values are at T= +25°C.)

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300ksps/400ksps, Single-Supply, 4-Channel,Serial 12-Bit ADCs with Internal Reference

ELECTRICAL CHARACTERISTICS—MAX1283 (continued)

(VDD1= VDD2= +2.7V to +3.6V, COM = GND, fOSC= 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), external+2.5V at REF, REFADJ = VDD1, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)

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