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)

♦ ±1LSB (max) DNL, ±1LSB (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