AS6500-FQFM

Overview

The AS6500-FQFM is a four-channel time-to-digital converter (TDC) frontend device manufactured by ScioSense, housed in a QFN40 package. It provides single-shot RMS resolution of 20 ps, with options for 15 ps and 10 ps via high-resolution modes. The device supports a differential reference clock input ranging from 2 MHz to 12.5 MHz and features CMOS-level stop inputs. Data is transferred via an SPI interface with a maximum throughput of approximately 1.5 MSPS. Each channel includes a 16-stage FIFO buffer. Operating conditions range from -40°C to +125°C with a supply voltage of 3.3 V and power dissipation of 60 mW.

Feature Summary

• Four independent stop channels with configurable pulse-to-pulse spacing and combination modes for enhanced measurement flexibility.
• Automatic calibration mechanism referencing the applied clock eliminates the need for external phase-locked loops or delay-locked loops.
• Integrated linear voltage regulator and quartz oscillator driver simplify circuit design by reducing external component count.
• Configurable high-resolution modes allow trade-offs between measurement precision and peak conversion rates.

Applications

• Laser range measurement systems
• Time-of-flight distance sensing
• LiDAR sensor modules

Procurement Notes

Verify the specific ordering code AS6500-FQFM against official ScioSense documentation to confirm the delivery form and reel quantity specifications. Ensure that the application environment remains within the recommended operating temperature and voltage limits defined in the datasheet to maintain performance integrity.

Selection Notes

Select this component when high temporal resolution is required for optical ranging applications. Consider the available high-resolution modes if sub-20 ps accuracy is necessary, keeping in mind the associated reduction in peak conversion rate. Verify that the host microcontroller can support the required SPI clock frequency and data handling throughput.

Part Context

The AS6500 is a derivative of the TDC-GPX2 series, specifically designed with CMOS inputs and serial SPI output capabilities. It maintains the core measurement performance of its predecessor while offering a simplified interface suitable for integration into compact electronic designs requiring precise time interval measurements.

Replacement Considerations

The TDC-GPX2 serves as a functional equivalent within the same product family. Differences primarily involve input/output interface configurations and package types. Verify pin compatibility and register mapping before implementing any substitution in existing hardware designs.