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General Description

The MAX1284/MAX1285 12-bit analog-to-digital converters (ADCs) combine a high-bandwidth track/hold (T/H), a serial interface with high conversion speed, an internal +2.5V reference, and low power consumption. The MAX1284 operates from a single +4.5V to +5.5V supply. The MAX1285 operates from a single +2.7V to +3.6V supply.

The 3-wire serial interface connects directly to SPI?/QSPI?/ MICROWIRE? devices without external logic. The devices use an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

Low power, ease of use, and small package size make these converters ideal for remote-sensor and data-acquisition applications or for other circuits with demanding power consumption and space requirements. The MAX1284/MAX1285 are available in 8-pin SO packages.

These devices are pin-compatible, higher-speed versions of the MAX1240/MAX1241. Refer to the respective data sheets for more information.

Features

? Single-Supply Operation

?? +4.5V to +5.5V (MAX1284)

?? +2.7V to +3.6V (MAX1285)

? ¡À1LSB (max) DNL, ¡À1LSB (max) INL

? 400ksps Sampling Rate (MAX1284)

? Internal Track/Hold

? +2.5V Internal Reference

? Low Power: 2.5mA (400ksps)

? SPI/QSPI/MICROWIRE 3-Wire Serial-Interface

? Pin-Compatible, High-Speed Upgrades to MAX1240/MAX1241

? 8-Pin SO Package

Applications

?? Portable Data Logging

?? Data Acquisition

?? Medical Instruments

?? Battery-Powered Instruments

?? Pen Digitizers

?? Process Control