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The MAX11644/MAX11645 low-power, 12-bit, 1-/2-channel 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 (MAX11645) or 4.5V to 5.5V (MAX11644) and require only 670μA at the maximum sampling rate of 94.4ksps. Supply current falls below 230μA for sampling rates under 40ksps. AutoShutdown? powers down the devices between conversions, reducing supply current to less than 1μA at low throughput rates. The MAX11644/MAX11645 each measure two single-ended or one differential input. 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 MAX11645 features a 2.048V internal reference and the MAX11644 features a 4.096V internal reference.

The MAX11644/MAX11645 are available in an 8-pin μMAX? package. The MAX11644/MAX11645 are guaranteed over the extended temperature range (-40°C to +85°C). For pin-compatible 10-bit parts, refer to the MAX11646/MAX11647 data sheet.

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High-Speed I2C-Compatible Serial Interface

• 400kHz Fast Mode
• 1.7MHz High-Speed Mode

Single-Supply

• 2.7V to 3.6V (MAX11645)
• 4.5V to 5.5V (MAX11644)

Internal Reference

• 2.048V (MAX11645)
• 4.096V (MAX11644)

External Reference: 1V to V_DD

Internal Clock

• 2-Channel Single-Ended or 1-Channel Fully Differential

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, 8-Pin μMAX Package