1.5V to 3.6V, 416ksps, 1-Channel True-Differential/2-Channel Single-Ended, 8-Bit, SAR ADCs

The MAX1391/MAX1394 micropower, serial-output, 8-bit, analog-to-digital converters (ADCs) operate with a single power supply from +1.5V to +3.6V. These ADCs feature automatic shutdown, fast wake-up, and a high-speed 3-wire interface. Power consumption is only 0.743mW (VDD = +1.5V) at the maximum conversion rate of 416ksps. AutoShutdown™ between conversions reduces power consumption at slower throughput rates.

The MAX1391/MAX1394 require an external reference VREF that has a wide range from 0.6V to VDD. The MAX1391 provides one true-differential analog input that accepts signals ranging from 0 to VREF (unipolar mode) or ± VREF/2 (bipolar mode). The MAX1394 provides two single-ended inputs that accept signals ranging from 0 to VREF. Analog conversion results are available through a 5MHz 3-wire SPI™-/QSPI™-/MICROWIRE™-/digital signal processor (DSP)-compatible serial interface. Excellent dynamic performance, low voltage, low power, ease of use, and small package sizes make these converters ideal for portable battery-powered data-acquisition applications, as well as other applications that demand low-power consumption and minimal space.

The MAX1391/MAX1394 are available in a space-saving (3mm x 3mm), 10-pin TDFN package. The parts operate over the extended (-40°C to +85°C) temperature range.

Applications

* Battery-Powered Instruments * Data Acquisition * Medical Instruments * Portable Data Logging * Process Control

* 416ksps, 8-Bit Successive-Approximation Register (SAR) ADCs

* Single True-Differential Analog Input Channel with Unipolar-/Bipolar-Selected Input (MAX1391)

* Dual Single-Ended Input Channel with Channel-Selected Input (MAX1394)

* ±0.2 LSB INL, ±0.2 LSB DNL, No Missing Codes

* ±0.25 LSB Total Unadjusted Error (TUE)

* 49dB SINAD at 100kHz Input Frequency

* Single Supply Voltage (+1.5V to +3.6V)

* 0.97mW at 416ksps, 1.8V

* 0.230mW at 100ksps, 1.8V

* 3.1µW at 1ksps, 1.8V

* < 1µA Shutdown Current

* External Reference (0.6V to VDD)

* AutoShutdown Between Conversions

* SPI-/QSPI-/MICROWIRE-/DSP-Compatible, 3- or 4-Wire Serial Interface

* Small (3mm x 3mm), 10-Pin TDFN