MAX1402EAI+

The MAX1402EAI+ is a 5V, 18bit, low power, multichannel, oversampling (sigma-delta) ADC in 28 pin SSOP package. This ADC features matched 200µA current sources for sensor excitation and uses a sigma-delta modulator with a digital decimation filter to achieve 16bit accuracy. The digital filter’s user selectable decimation factor allows the conversion resolution to be reduced in exchange for a higher output data rate. True 16bit performance is achieved 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. This device offers three fully differential input channels that may be independently programmed with a gain between +1V/V and +128V/V. This device is used in portable weigh scales, loop-powered systems and pressure transducers.

• Analogue supply voltage range is 4.75V to 5.25V and +3V or +5V digital supply
• Operating temperature range from -40°C to 85°C
• Matched on-board current sources (200µA) for sensor excitation, programmable gain and offset
• 3 fully differential or 5 pseudo-differential signal input channels
• 2 additional, fully differential calibration channels/auxiliary input channels
• Fully differential reference inputs
• Converts continuously or on command
• Automatic channel scanning and continuous data output mode
• 3-wire serial interface - SPI/QSPI compatible
• Low quiescent current of 250µA (operating mode) & 2µA (power-down mode)

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