General Description

AS1716 is an analog front end specifically designed for unbiased Capacitive Sensors, as for instance Knock Sensors in Automotive, to be interfaced with Analog Digital Converters with Sample and Hold input stages.

The device provides differential inputs, a 1st order low pass filter to cutoff the high frequency noise components, differential to single ended conversion, programmable gain stage and a 2 pole low pass Multiple Feedback Filter.

Key Features

Differential input stage with wide input range

Resistive sensor biasing (VDDA/2)

Programmable Gain (x0.5, x1, x2, x4)

Internal 2nd order low pass Multiple Feedback Filter with a min.cut off frequency of 16kHz

Single supply operation: 4.5V to 5.5V

Operating Temperature range: -40°C to +125°C

High CMRR: 55dB (min)

EMC characterized by IEC 61967-4 (1Ω / 150Ω Method)

EMC characterized by IEC 62132-4 (Direct Power Injection)

Automotive qualified to AECQ100 for IC and PPAP level 3

8-pin SOIC Package

Applications

Analog front end for Capacitive Sensors to Analog to Digital Convert ers and DSP.