The MAX1236MAX1239 low-power, 12-bit, multichannel analog-to-digital converters (ADCs) feature internal track/hold (T/H), voltage reference, clock, and an I2C-compatible 2-wire serial interface. These devices operate from a single supply of 2.7V to 3.6V (MAX1237/ MAX1239) or 4.5V to 5.5V (MAX1236/MAX1238) and require only 670A at the maximum sampling rate of 94.4ksps. Supply current falls below 230A for sampling rates under 46ksps. AutoShutdownTM powers down the devices between conversions, reducing supply current to less than 1A at low throughput rates. The MAX1236/MAX1237 have four analog input channels each, while the MAX1238/MAX1239 have 12 analog input channels each. The fully differential analog inputs are software configurable for unipolar or bipolar, and single-ended or differential operation. The full-scale analog input range is determined by the internal reference or by an externally applied reference voltage ranging from 1V to V DD . The MAX1237/ MAX1239 feature a 2.048V internal reference and the MAX1236/MAX1238 feature a 4.096V internal reference. The MAX1236/MAX1237 are available in an 8-pin MAX package. The MAX1238/MAX1239 are available in a 16pin QSOP package. The MAX1236MAX1239 are guaranteed over the extended temperature range (-40C to +85C). For pin-compatible 10-bit parts, refer to the MAX1136MAX1139 data sheet. For pin-compatible 8-bit parts, refer to the MAX1036MAX1039 data sheet.