QT301-D

ADCs/DACs - Special Purpose Overview

The QT301-D is a capacitance-to-analog converter (CAC) IC manufactured by Microchip Technology, utilizing a patented charge-transfer conversion method. It provides an 8-bit resolution PWM output with a frequency of 100 kHz. The device operates on a single power supply ranging from 3V to 5.5V and supports an operating temperature range of 0°C to +70°C. Key features include spread-spectrum acquisition bursts for noise rejection, end-to-end calibration via CAL pins, and sample-on-demand functionality through a Sync pin. It requires only one external sampling capacitor.

ADCs/DACs - Special Purpose Feature Summary

• Capacitance-to-Analog Converter using patented charge-transfer method
• 100 kHz PWM output with 8-bit resolution
• Spread spectrum acquisition bursts for low noise and high EMI immunity
• End-to-end calibration (gain, span) via CAL_DN and CAL_UP pins

ADCs/DACs - Special Purpose Applications

• Fluid level sensors
• Material sensors
• Proximity sensors
• Moisture detection
• Transducer driver applications

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity as the QT301-D is listed as obsolete in distributor databases. Confirm package type matches the 8-PDIP specification. Check RoHS compliance status, as the datasheet indicates non-compliance. Ensure availability of technical documentation from authorized sources given the product lifecycle stage.

ADCs/DACs - Special Purpose Selection Notes

Select the QT301-D when designing standalone instrumentation requiring direct capacitance measurement without digital processing. Choose this part if the application benefits from a simple RC filter interface for the PWM output. Consider the -D suffix specifically for commercial temperature ranges (0°C to +70°C); use the -IS variant for industrial ranges (-40°C to +85°C).

ADCs/DACs - Special Purpose Part Context

The QT301 is part of the Quantum Resonant Group (QRG) family of capacitance sensing devices, now associated with Microchip Technology. Unlike other QRG products that process data internally, the QT301 outputs raw, unprocessed PWM data. This design allows designers to implement custom signal processing or filtering schemes externally.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should evaluate the QT301-IS for temperature range compatibility or consult manufacturer resources for current generation alternatives.