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