For processing signals from a sensor or MEMS device, the Smart Programmable Sensor Interface (MSSPSI) is a monolithis CMOS integrated circuit. Small analog Signals from a sensor or MEMS are anti-aliasesd, filered and amplified before being converted into a digital signal output by the MSSPSI. These processing functions are controlled by an external uP through the MSSPSI's on-chip serial interface. The MSSPSI also includes offset adjust, low power modes and an on-chip temperature sensor.

The input is fed into a low noise amplifier followed by two 6th order Bliptic switched capacitor anti-aliasing filters. The gain of the filter is controllable via the serial interface up to 18 dB (6dB) steps. The next stage is a 6 pole Butterworth switched capacitor highpass filter, also with up to 10dB of controllable gain. Following this is a 7th order Elliptic switched capacitor lowpass filter. These internal filters can be bypassed via the serial interface. The 12 bit, 160 kSps A-to-D converter provides a digital output. 

The MSSPSI operates with a supply voltage from 3.3 VDC up to 5.5 VDC. It is available in a 32 pin LQFP Package with an industrial temperature range.

• Low Power Modes
• Low Noise Input (30 nV/(Hz)1/2 at 100 Hz
• Anti Alias Filter with Adjustable Gain
• Low pass Filter with Adjustable Gain Stage
• Programmable SC Highpass Filter with Gain Adjust
• Programmable SC Lowpass Filter with Gain Adjust
• Temperature Sensor
• Offset Adjust
• 12 bit 160 ksps A-to-D Converter and 4 input Mux