Overview
The VFC32KU, produced by Texas Instruments, is a high-performance voltage-to-frequency and frequency-to-voltage converter. This component is designed to provide a reliable and accurate interface between analog and digital systems, enabling efficient data acquisition and signal processing applications. It operates on the principle of charge balance, ensuring excellent linearity and temperature stability. The VFC32KU is available in various packages, including 14-pin plastic DIP, SO-14 surface-mount, and metal TO-100 packages, catering to different application needs.
Key Specifications
| Parameter | Conditions | Min | Typ | Max |
|---|---|---|---|---|
| Supply Voltage | ±15V | ±22V | ||
| Output Sink Current (FOUT) | 50mA | |||
| Output Current (VOUT) | +20mA | |||
| Input Voltage, –Input | ±Supply | |||
| Input Voltage, +Input | ±Supply | |||
| Comparator Input | ±Supply | |||
| Operating Temperature Range | –25°C to +85°C | |||
| Storage Temperature Range | –65°C to +150°C | |||
| Voltage Range (Positive Input) | 0 | 10V | ||
| Voltage Range (Negative Input) | 0 | –10V | ||
| Current Range | 0 | 0.25mA | ||
| Bias Current (Inverting Input) | 20nA | 100nA | 250nA | |
| Bias Current (Noninverting Input) | 100nA | 250nA | ||
| Offset Voltage | 1mV | 4mV | ||
| Differential Impedance | 300kΩ || 10pF | 650kΩ || 10pF | ||
| Common-mode Impedance | 300kΩ || 3pF | 500kΩ || 3pF |
Key Features
- Operation up to 500kHz with excellent linearity (±0.01% max at 10kHz FS, ±0.05% max at 100kHz FS)
- Voltage-to-frequency (V/F) or frequency-to-voltage (F/V) conversion capabilities
- Monotonic operation
- Voltage or current input options
- Integrating input characteristics for excellent noise immunity and low nonlinearity
- Full-scale output frequency adjustable via external capacitor and resistor
- Available in 14-pin plastic DIP, SO-14 surface-mount, and metal TO-100 packages
- Commercial, industrial, and military temperature range models available
- Low power consumption and stable performance over temperature and supply variations
Applications
- Integrating A/D converters
- Serial frequency output
- Isolated data transmission
- FM analog signal modulation/demodulation
- Motor speed control
- Tachometer applications
Q & A
- What is the maximum operating frequency of the VFC32KU? The VFC32KU can operate up to 500kHz.
- What is the typical linearity error of the VFC32KU at 10kHz full-scale frequency? The typical linearity error is ±0.01% at 10kHz full-scale frequency.
- What are the input voltage ranges for the VFC32KU? The input voltage ranges are 0 to 10V for positive inputs and 0 to –10V for negative inputs.
- What is the recommended duty cycle for best linearity? A 25% duty cycle (0.25mA input current) is recommended for best linearity.
- Can the VFC32KU be used as a frequency-to-voltage converter? Yes, the VFC32KU can be configured as a frequency-to-voltage converter.
- What are the storage temperature ranges for the VFC32KU? The storage temperature ranges are –65°C to +150°C for BM and SM models, and –25°C to +85°C for KP and KU models.
- What is the output sink current of the VFC32KU? The output sink current is 50mA.
- What types of packages are available for the VFC32KU? The VFC32KU is available in 14-pin plastic DIP, SO-14 surface-mount, and metal TO-100 packages.
- What are some common applications of the VFC32KU? Common applications include integrating A/D converters, serial frequency output, isolated data transmission, FM analog signal modulation/demodulation, motor speed control, and tachometer applications.
- How does the VFC32KU ensure excellent noise immunity? The VFC32KU ensures excellent noise immunity through its integrating input characteristics.
