General Description

The MAX1236–MAX1239 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 670µA at the maximum sampling rate of 94.4ksps. Supply current falls below 230µA for sampling rates under 46ksps. AutoShutdown™ powers down the devices between conversions, reducing supply current to less than 1µA at low throughput rates.

Features

♦ High-Speed I2C-Compatible Serial Interface

400kHz Fast Mode

1.7MHz High-Speed Mode

♦ Single-Supply

2.7V to 3.6V (MAX1237/MAX1239)

4.5V to 5.5V (MAX1236/MAX1238)

♦ Internal Reference

2.048V (MAX1237/MAX1239)

4.096V (MAX1236/MAX1238)

♦ External Reference: 1V to VDD

♦ Internal Clock

♦ 4-Channel Single-Ended or 2-Channel Fully Differential (MAX1236/MAX1237)

♦ 12-Channel Single-Ended or 6-Channel Fully Differential (MAX1238/MAX1239)

♦ Internal FIFO with Channel-Scan Mode

♦ Low Power

670µA at 94.4ksps

230µA at 40ksps

60µA at 10ksps

6µA at 1ksps

0.5µA in Power-Down Mode

♦ Software-Configurable Unipolar/Bipolar

♦ Small Packages

8-Pin µMAX (MAX1236/MAX1237)

16-Pin QSOP (MAX1238/MAX1239)

Applications

Handheld Portable Applications

Medical Instruments

Battery-Powered Test Equipment

Solar-Powered Remote Systems

Received-Signal-Strength Indicators

System Supervision