AS1716-ASOT

Overview

The AS1716-ASOT is an analog front-end IC designed for unbiased capacitive sensors, such as automotive knock sensors. It features differential inputs, a first-order low-pass filter, and a programmable gain stage with selectable gains of x0.5, x1, x2, or x4. The device includes a second-order multiple feedback low-pass filter with a typical cutoff frequency of 23 kHz to prevent aliasing. Operating on a single supply voltage between 4.5 V and 5.5 V, it provides high common-mode rejection ratio (CMRR) of at least 55 dB. The component is automotive qualified to AEC-Q100 standards and housed in an 8-pin SOIC package.

Feature Summary

• Differential input stage with wide input range and internal resistive sensor biasing at VDDA/2
• Programmable gain amplifier supporting four distinct settings: x0.5, x1, x2, and x4
• Integrated second-order low-pass multiple feedback filter with a minimum cutoff frequency of 16 kHz
• Automotive qualification compliant with AEC-Q100 and PPAP level 3 requirements

Applications

• Analog front-end conditioning for capacitive knock sensors in automotive engine management systems
• Signal interface between piezoelectric sensors and Analog-to-Digital Converters (ADCs)
• Connection to Digital Signal Processors (DSPs) requiring filtered and amplified sensor data

Procurement Notes

Verify the specific ordering code AS1716-ASOT corresponds to the tape and reel delivery form when sourcing components. Confirm that the supplier provides documentation attesting to RoHS compliance and AEC-Q100 qualification status. Ensure the procurement channel is authorized to guarantee authenticity and traceability for automotive-grade electronic components.

Selection Notes

Select this component when interfacing unbiased capacitive sensors directly to ADCs with sample-and-hold stages. It is suitable for applications requiring a single-supply operation within the 4.5 V to 5.5 V range. Consider this device if the design demands high common-mode rejection and integrated filtering to suppress high-frequency noise without external complex circuitry.

Part Context

The AS1716 is part of a specialized family of analog front-end solutions developed for automotive sensor interfaces. Manufactured by austriamicrosystems AG, now operating under the ams-OSRAM brand, these components are engineered specifically for harsh automotive environments. The AS1716 addresses the need for robust signal conditioning in engine control units where reliable knock detection is critical for performance optimization.

Replacement Considerations

No direct public substitute part numbers are documented in the official datasheet. Designers should evaluate functional equivalents based on matching specifications such as supply voltage range, gain settings, and package type. Any replacement must maintain compatibility with the required AEC-Q100 automotive qualification standards.