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