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 (V_DD = +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 V_REF that has a wide range from 0.6V to V_DD. The MAX1391 provides one true-differential analog input that accepts signals ranging from 0 to V_REF (unipolar mode) or ± V_REF/2 (bipolar mode). The MAX1394 provides two single-ended inputs that accept signals ranging from 0 to V_REF. 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.

MAX1391, MAX1394: Typical Operating Circuit

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Key Features

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 V_DD)
AutoShutdown Between Conversions
SPI-/QSPI-/MICROWIRE-/DSP-Compatible, 3- or 4-Wire Serial Interface
Small (3mm x 3mm), 10-Pin TDFN

Applications/Uses

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

Design Resources

Technical Documents

App Note 4490 How Signal Chains and PLCs Impact Our Lives

Quality and Environmental Data

Request Reliability Report for: MAX1391
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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