Overview
The VFC32KU/2K5, produced by Texas Instruments, is a voltage-to-frequency converter that provides an output frequency accurately proportional to its input voltage. This device operates on the principle of charge balance, ensuring excellent linearity and noise immunity. It is available in a 14-pin SOIC package and is suitable for various applications requiring precise frequency conversion.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Voltage Range (Positive Input) | 0 | 10 | V | ||
| Voltage Range (Negative Input) | 0 | -10 | V | ||
| Current Range | 0 | 0.25 | mA | ||
| Bias Current (Inverting Input) | 20 | 100 | nA | ||
| Bias Current (Noninverting Input) | 100 | 250 | nA | ||
| Offset Voltage | 1 | 4 | mV | ||
| Full Scale Frequency | 500 | kHz | |||
| Dynamic Range | 6 decades | ||||
| Supply Voltage | ±11 | ±20 | V | ||
| Quiescent Current | ±5.5 | ±6.0 | mA |
Key Features
- Operation up to 500 kHz
- Excellent linearity: ±0.01% max at 10 kHz FS, ±0.05% max at 100 kHz FS
- Voltage-to-frequency (V/F) or frequency-to-voltage (F/V) conversion
- Monotonic operation
- Voltage or current input
- Digital open-collector frequency output compatible with all common logic families
- Integrating input characteristics for excellent noise immunity and low nonlinearity
- Available in 14-pin plastic DIP, SO-14 surface-mount, and metal TO-100 packages
- Commercial, industrial, and military temperature range models available
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/2K5?
The VFC32KU/2K5 can operate up to 500 kHz.
- What is the linearity error of the VFC32KU/2K5 at 10 kHz full-scale frequency?
The linearity error is ±0.01% max at 10 kHz full-scale frequency.
- Can the VFC32KU/2K5 be used for both voltage-to-frequency and frequency-to-voltage conversions?
Yes, the VFC32KU/2K5 can be configured for both V/F and F/V conversions.
- What types of packages are available for the VFC32KU/2K5?
The VFC32KU/2K5 is available in 14-pin plastic DIP, SO-14 surface-mount, and metal TO-100 packages.
- What is the recommended duty cycle for best linearity?
A 25% duty cycle (0.25 mA input current) is recommended for best linearity.
- How is the full-scale output frequency determined?
The full-scale output frequency is determined by an external capacitor (C1) and resistor (R1).
- What are the typical applications of the VFC32KU/2K5?
Typical applications include integrating A/D converters, serial frequency output, isolated data transmission, FM analog signal modulation/demodulation, motor speed control, and tachometer applications.
- What is the quiescent current of the VFC32KU/2K5?
The quiescent current is ±5.5 mA to ±6.0 mA.
- What is the storage temperature range for the VFC32KU/2K5?
The storage temperature range is –65°C to +150°C for BM and SM models, and –25°C to +85°C for KP and KU models.
- Can the offset voltage be adjusted?
Yes, the offset voltage can be adjusted to zero. See the Offset and Gain Adjustment section in the datasheet.
