DESCRIPTION
MAS6505 is a piezoresistive sensor signal interface IC with a low noise analog front-end (AFE) and an Analog-to-Digital Converter (ADC). The AFE comprises of a low noise chopper amplifier with 32 selectable gain options from 1x up to 55.8x and an input signal polarity selection. The ADC employs delta-sigma (ΔΣ) A/D conversion technique with seven oversampling ratio (OSR) options for optimization between speed, power consumption and resolution. The ADC’s 1-sigma noise resolution is up to 17.9 bits in the 1400 mV input signal range (ISR) of the ADC. Additionally the ADC has eight input offset options with both polarities to match input signal range with different sensor signals. The sensor input 1-sigma noise resolution is down to 0.27 Vrms which can be further reduced with four digital low pass filtering options.

FEATURES
• Supply Voltage 1.71 V…5.5 V
• Low Sleep Current Consumption 42nA Typ
• Very Low Operating Current 1.3 µA…25 µA Typ
• Very Low Noise Analog Front-End 0.27 µVrms
• Ratiometric ΔΣ A/D Conversion
• A/D Conversion Time 1.25 ms…40.02 ms Typ
• Sensor Resistance Range 3 kΩ…6 kΩ
• Seven Resolution Options by OSR Selection
• Internal Clock Oscillator
• 2-Wire Serial Data Interface (I2C Bus)
• 4- and 3-Wire Serial Peripheral Interface Bus
• 512 Bit EEPROM Memory

APPLICATIONS
• Digital Piezoresistive Pressure Modules
• Altimeter and Barometer
• Temperature measurement
• Battery Powered Systems
• Navigation systems
• Industrial and Process Control Applications