• optimized for piezoresistive pressure sensors 
• very low power consumption 
• ratiometric 16 bit ∆Σ ADC 
• linearity 14 bits 
• internal clock oscillator 
• serial data interface (I2C Bus) 
• 256 bit EEPROM memory

MAS6502 is a 16 bit Analog-to-Digital Converter (ADC), which employs a delta-sigma (∆Σ) conversion technique. With the linear input signal range of 260 mVPP the linearity is 14 bits. 

MAS6502 is designed especially to meet the requirement for low power consumption, thus making it an ideal choice for battery powered systems. The MAS6502 is equipped with a standby function, i.e. the ADC is in power down between each conversion. By utilizing this and overall low power consumption, current consumption values of 2.5 µA (one pressure conversion in a second with full 14-bit accuracy) or less can be achieved. 

MAS6502 has an on-chip second order decimator filter to process the output of the second order ∆Σ -modulator. The ADC also has four selectable input signal ranges with one optional offset level. An internal trimmed clock oscillator provides a system clock signal (DCLK) eliminating the need for an external clock signal. 

A bi-directional I2C bus compatible 2-wire serial bus is used for configuring conversion parameters, starting conversion and reading out the A/D conversion result. 

MAS6502 has one input channel suitable for a piezoresistive pressure sensor. In addition to pressure measurement the device can be configured also for temperature measurement. 

The 256-bit EEPROM memory is available for storing trimming and calibration data on chip.

Features:

• low standby current consumption 0.05 µA Typ 
• very low supply current: 0.4 µA…2.5 µA Typ 
• supply voltage: 2.0 V…3.6 V 
• ratiometric ∆Σ conversion 
• selectable input signal ranges (VDD=2.35V): 325 mVPP, 220 mVPP, 150 mVPP, 100 mVPP
• selectable optional offset (VDD=2.35V): 33 mV 
• selectable sensor resistance values: 5 kΩ, 4.5 kΩ, 4 kΩ, 3.4 kΩ
• over sampling ratio: 512, 256, 128, 64 
• internal system clock signal 100 kHz 
• conversion times 0.8 ms…10.6 ms typ 
• 2-Wire serial data interface (I2C bus) 
• 256 Bit EEPROM memory 
• good noise performance due to ∆Σ architecture 

Applications:

• calibrated piezoresistive pressure modules 
• temperature measurement 
• battery powered systems 
• low frequency measurement applications 
• current/power consumption critical systems 
• industrial and process control applications in noisy environments