General Description
The MAX1400 18-bit, low-power, multichannel, serial output ADC uses a sigma-delta modulator with a digital decimation filter to achieve true 16-bit accuracy. The user-selectable decimation factor of the digital filter allows the conversion resolution to be reduced in exchange for a higher output data rate. The device achieves true 16-bit performance at an output data rate of up to 480sps. In addition, the modulator sampling frequency may be optimized for either lowest power dissipation or highest throughput rate. The MAX1400 operates from +5V.

Features
♦ 18-Bit Resolution, Sigma-Delta ADC
♦ 16-Bit Performance with No Missing Codes to 480sps
♦ Low Quiescent Current
    250µA (operating mode)
    2µA (power-down mode)
♦ 3 Fully Differential or 5 Pseudo-Differential Signal Input Channels
♦ 2 Additional Fully Differential Calibration Channels/Auxiliary Input Channels
♦ Access to the Mux Output/ADC Input
♦ Programmable Gain and Offset
♦ Fully Differential Reference Inputs
♦ Converts Continuously or On Command
♦ Automatic Channel Scanning and Continuous Data Output Mode
♦ Operates with +5V Analog Supply and +3V or +5V Digital Supply
♦ SPI™/QSPI™-Compatible 3-Wire Serial Interface
♦ 28-Pin SSOP Package

Applications
    Portable Industrial Instruments
    Portable Weigh Scales
    Loop-Powered Systems
    Pressure Transducers