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General Description

The MAX1227/MAX1229/MAX1231 are serial 12-bit analog-to-digital converters (ADCs) with an internal reference and an internal temperature sensor. These devices feature an on-chip FIFO, scan mode, internal clock mode, internal averaging, and AutoShutdown?. The maximum sampling rate is 300ksps using an external clock. The MAX1231 has 16 input channels, the MAX1229 has 12 input channels, and the MAX1227 has 8 input channels. All input channels are configurable for single-ended or differential inputs in unipolar or bipolar mode. All three devices operate from a +3V supply and contain a 10MHz SPI?-/QSPI?-/MICROWIRE?-compatible serial port.

The MAX1231 is available in 28-pin 5mm x 5mm TQFN with exposed pad and 24-pin QSOP packages. The MAX1227/MAX1229 are only available in QSOP packages. All three devices are specified over the extended -40°C to +85°C temperature range.

Features

? Internal Temperature Sensor (±0.7°C Accuracy)

? 16-Entry First-In/First-Out (FIFO)

? Analog Multiplexer with True Differential Track/Hold

?? 16-, 12-, 8-Channel Single Ended

?? 8-, 6-, 4-Channel True Differential

?? (Unipolar or Bipolar)

? Accuracy: ±1 LSB INL, ±1 LSB DNL, No Missing

?? Codes Overtemperature

? Scan Mode, Internal Averaging, and Internal Clock

? Low-Power Single +3V Operation 1mA at 300ksps

? Internal 2.5V Reference or External Differential Reference

? 10MHz 3-Wire SPI-/QSPI-/MICROWIRE-Compatible Interface

? Space-Saving 28-Pin 5mm x 5mm TQFN Package

Applications

?? System Supervision

?? Data-Acquisition Systems

?? Industrial Control Systems

?? Patient Monitoring

?? Data Logging

?? Instrumentation