VFC32KP

Overview

The VFC32KP is a voltage-to-frequency and frequency-to-voltage converter manufactured by Texas Instruments. It operates with a rated supply voltage of -15V, ranging from -11V to -20V. The device supports full-scale frequencies up to 500kHz and offers a dynamic range of six decades. Linearity error is specified at -0.01% maximum for frequencies between 0.01Hz and 10kHz, and -0.05% maximum for frequencies between 0.1Hz and 100kHz. The component is housed in a 14-pin plastic DIP package and functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Provides accurate voltage-to-frequency conversion with digital open-collector output compatible with common logic families.
• Features integrating input characteristics that ensure excellent noise immunity and low nonlinearity.
• Capable of bidirectional operation as either a voltage-to-frequency or frequency-to-voltage converter.
• Supports both voltage and current input configurations.

Applications

• Integrating A/D converters
• Serial frequency output systems
• Isolated data transmission
• FM analog signal modulation and demodulation
• Motor speed control

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Ensure the procurement channel provides valid traceability for the component. Confirm RoHS compliance status and lead finish specifications prior to purchase. Validate that the supplier source is authorized to prevent counterfeit components.

Selection Notes

Select this component when high linearity and wide dynamic range are required for precision conversion tasks. Consider the operating temperature range of 0°C to +70°C for commercial applications. Evaluate external component requirements, such as capacitor types for stability, to maintain specified performance levels. Verify compatibility with the system's logic family for the open-collector output interface.

Part Context

This part belongs to the VFC32 series of converters, which includes variants like the VFC32BM and VFC32SM offering extended industrial and military temperature ranges. The VFC32KU variant utilizes an SOIC surface-mount package. All variants share the same core functionality but differ in packaging and thermal specifications.

Replacement Considerations

Direct substitutes include the VFC32BM (TO-100 metal package) and VFC32SM (TO-100 metal package). For surface-mount needs, the VFC32KU (SOIC-14) is available. These parts share identical electrical characteristics but differ in physical package and temperature ratings.

FAQ

What is the recommended duty cycle for best linearity?

A 25% duty cycle, corresponding to a 0.25mA input current, is recommended for optimal linearity performance.

How is the full-scale output frequency determined?

The full-scale output frequency is determined by an external resistor and capacitor connected to the device.

What type of output does the VFC32KP provide?

It provides a digital open-collector frequency output that requires an external pull-up resistor.