AS1716A-ASOT

Overview

The AS1716 is an analog front-end IC designed for unbiased capacitive sensors, such as automotive knock sensors. It interfaces with ADCs featuring sample-and-hold stages. Key electrical parameters include a single supply voltage range of 4.5V to 5.5V and an operating temperature range from -40°C to +125°C. The device provides differential inputs, a programmable gain stage (x0.5, x1, x2, x4), and a second-order low-pass multiple feedback filter with a typical cutoff frequency of 23kHz. It features a high common-mode rejection ratio (CMRR) of 55dB minimum and operates on a single supply.

Feature Summary

• Differential input stage with wide input range and resistive sensor biasing at VDDA/2
• Programmable gain settings selectable via logic pins GA and GB
• Internal second-order low-pass multiple feedback filter to prevent aliasing
• Automotive qualified to AEC-Q100 standards with EMC characterization

Applications

• Analog front end for capacitive sensors interfacing with Analog-to-Digital Converters
• Signal conditioning for piezoelectric knock sensors in engine management systems
• Noise filtering and amplification for DSP applications in automotive environments

Procurement Notes

Verify the ordering code matches the required delivery form. The AS1716-ASOT variant is supplied in tape and reel packaging. Confirm RoHS compliance status if required by specific manufacturing processes. Ensure the supplier source aligns with authorized distribution channels to guarantee component authenticity and traceability.

Selection Notes

Select this component when interfacing unbiased capacitive or piezoelectric sensors directly to microcontrollers or ADCs. The internal biasing eliminates external resistor networks. Choose based on required gain settings using the GA and GB pins. Ensure the application environment falls within the specified -40°C to +125°C temperature range and utilizes a 5V single supply.

Part Context

The AS1716 belongs to the family of capacitive sensor interface devices manufactured by austriamicrosystems AG (now ams-OSRAM). It is specifically engineered for automotive noise detection applications. The device simplifies signal conditioning by integrating filtering, gain control, and conversion functions into a compact 8-pin SOIC package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and electrical specifications against alternative components before implementation.